# Sidereon v0.27.0 - Table of Contents

> Satellite toolkit for Elixir with SGP4 propagation, coordinate transforms,
GNSS positioning, orbit determination, conjunction assessment, pass
prediction, and a Rust NIF backend.

## Pages

- [sidereon](readme.md)
- [sidereon: GNSS and astrodynamics in Elixir](sidereon.md)
- [Changelog](changelog.md)
- [GNSS Positioning](gnss_positioning.md)

- Guides
  - [Predict Passes with Doppler](pass_prediction.md)
  - [Accuracy &amp; Validation](accuracy.md)
  - [Data Acquisition](data_acquisition.md)
  - [GNSS Constellation Catalogs](gnss_constellation_catalog.md)

## Modules

- [Sidereon.Astro.Almanac](Sidereon.Astro.Almanac.md): Almanac event finders.
- [Sidereon.Astro.Anomaly](Sidereon.Astro.Anomaly.md): Kepler anomaly conversions and two-body propagation for classical elements.

- [Sidereon.Astro.Equinoctial](Sidereon.Astro.Equinoctial.md): Equinoctial and modified equinoctial orbital element conversions.

- [Sidereon.Astro.Equinoctial.EquinoctialElements](Sidereon.Astro.Equinoctial.EquinoctialElements.md): Equinoctial orbital elements.

- [Sidereon.Astro.Equinoctial.ModifiedEquinoctialElements](Sidereon.Astro.Equinoctial.ModifiedEquinoctialElements.md): Modified equinoctial orbital elements.

- [Sidereon.Astro.Observe](Sidereon.Astro.Observe.md): General topocentric body observation.
- [Sidereon.Astro.Relative](Sidereon.Astro.Relative.md): RSW, RTN, RIC, LVLH relative frames and Clohessy-Wiltshire motion.

- [Sidereon.Astro.Relative.State](Sidereon.Astro.Relative.State.md): Cartesian state used by relative-frame and Clohessy-Wiltshire helpers.

- [Sidereon.Bodies](Sidereon.Bodies.md): Ground-observer Sun and Moon geometry.
- [Sidereon.CCSDS.CDM.ObjectData](Sidereon.CCSDS.CDM.ObjectData.md): Object-specific data block inside a parsed CCSDS CDM.

- [Sidereon.CCSDS.OEM.Covariance](Sidereon.CCSDS.OEM.Covariance.md): One 6x6 covariance block inside a parsed CCSDS OEM segment.
- [Sidereon.CCSDS.OEM.Metadata](Sidereon.CCSDS.OEM.Metadata.md): Metadata block for one CCSDS OEM segment.

- [Sidereon.CCSDS.OEM.Segment](Sidereon.CCSDS.OEM.Segment.md): One metadata/data segment of a CCSDS OEM.

- [Sidereon.CCSDS.OEM.State](Sidereon.CCSDS.OEM.State.md): One Cartesian state sample inside a parsed CCSDS OEM segment.
- [Sidereon.CCSDS.OPM.Covariance](Sidereon.CCSDS.OPM.Covariance.md): Optional OPM 6x6 covariance. `matrix` is a row-major list of six six-element
rows.

- [Sidereon.CCSDS.OPM.Keplerian](Sidereon.CCSDS.OPM.Keplerian.md): Optional OPM Keplerian elements.
- [Sidereon.CCSDS.OPM.Maneuver](Sidereon.CCSDS.OPM.Maneuver.md): One OPM maneuver block. `dv_km_s` is the `{x, y, z}` delta-v in the maneuver
reference frame.

- [Sidereon.CCSDS.OPM.Metadata](Sidereon.CCSDS.OPM.Metadata.md): OPM metadata block.

- [Sidereon.CCSDS.OPM.Spacecraft](Sidereon.CCSDS.OPM.Spacecraft.md): Optional OPM spacecraft parameters. Every field is optional.

- [Sidereon.CCSDS.OPM.State](Sidereon.CCSDS.OPM.State.md): OPM Cartesian state vector.
- [Sidereon.CCSDS.TDM.DataRecord](Sidereon.CCSDS.TDM.DataRecord.md): One time-tagged TDM tracking data record.

- [Sidereon.CCSDS.TDM.DataSection](Sidereon.CCSDS.TDM.DataSection.md): TDM data block containing comments and records.

- [Sidereon.CCSDS.TDM.Field](Sidereon.CCSDS.TDM.Field.md): A preserved KVN key/value field.

- [Sidereon.CCSDS.TDM.Metadata](Sidereon.CCSDS.TDM.Metadata.md): Metadata block for one TDM segment.

- [Sidereon.CCSDS.TDM.Observable](Sidereon.CCSDS.TDM.Observable.md): Parsed TDM observable family.

- [Sidereon.CCSDS.TDM.Participant](Sidereon.CCSDS.TDM.Participant.md): One named TDM tracking participant.

- [Sidereon.CCSDS.TDM.Path](Sidereon.CCSDS.TDM.Path.md): Parsed TDM signal path.

- [Sidereon.CCSDS.TDM.Scalar](Sidereon.CCSDS.TDM.Scalar.md): A numeric TDM data value and its exact source token.

- [Sidereon.CCSDS.TDM.Segment](Sidereon.CCSDS.TDM.Segment.md): One TDM metadata/data segment.

- [Sidereon.ClockStability](Sidereon.ClockStability.md): Allan-family clock-stability estimators.
- [Sidereon.ClockStability.Curve](Sidereon.ClockStability.Curve.md): One clock-stability estimator curve.
- [Sidereon.ClockStability.Curves](Sidereon.ClockStability.Curves.md): Combined Allan-family output.
- [Sidereon.ClockStability.PowerLawNoiseFit](Sidereon.ClockStability.PowerLawNoiseFit.md): Power-law clock-noise identification result.

- [Sidereon.ClockStability.PowerLawNoiseOptions](Sidereon.ClockStability.PowerLawNoiseOptions.md): Options for power-law clock-noise identification.

- [Sidereon.ClockStability.PowerLawNoiseRegion](Sidereon.ClockStability.PowerLawNoiseRegion.md): Consecutive tau span used for one fitted power-law coefficient.

- [Sidereon.ClockStability.PowerLawOctave](Sidereon.ClockStability.PowerLawOctave.md): Per-octave power-law classification.

- [Sidereon.Collision](Sidereon.Collision.md): Collision probability calculation for close approaches.
- [Sidereon.Collision.Result](Sidereon.Collision.Result.md): Result of a collision-probability evaluation.

- [Sidereon.Covariance](Sidereon.Covariance.md): Covariance matrix helpers for conjunction and orbit analysis.
- [Sidereon.Drag](Sidereon.Drag.md): Atmospheric drag parameters, acceleration, and decay estimates.

- [Sidereon.Drag.DecayEstimate](Sidereon.Drag.DecayEstimate.md): Estimated decay time and reentry state.

- [Sidereon.Drag.Parameters](Sidereon.Drag.Parameters.md): Ballistic drag settings passed to propagation and drag-force calculations.

- [Sidereon.Drag.SpaceWeather](Sidereon.Drag.SpaceWeather.md): Space-weather inputs for the core drag model.

- [Sidereon.Eclipse.EarthShadowModel](Sidereon.Eclipse.EarthShadowModel.md): Earth shape model used by eclipse shadow calculations.

- [Sidereon.Encounter](Sidereon.Encounter.md): Encounter geometry helpers for conjunction assessment.
- [Sidereon.Encounter.Frame](Sidereon.Encounter.Frame.md): Relative encounter geometry at a common epoch.
- [Sidereon.ErrorMetrics](Sidereon.ErrorMetrics.md): Position error metrics derived from supplied covariance matrices.
- [Sidereon.ErrorMetrics.ErrorEllipse](Sidereon.ErrorMetrics.ErrorEllipse.md): Horizontal one-sigma error ellipse.

- [Sidereon.ErrorMetrics.PercentileRadius](Sidereon.ErrorMetrics.PercentileRadius.md): Exact percentile circle or sphere radius plus the named approximation.

- [Sidereon.ErrorMetrics.PositionCovariance](Sidereon.ErrorMetrics.PositionCovariance.md): Position covariance in ECEF and local ENU coordinates.

- [Sidereon.ErrorMetrics.PositionErrorMetrics](Sidereon.ErrorMetrics.PositionErrorMetrics.md): Standard horizontal, vertical, and three-dimensional position error metrics.

- [Sidereon.Forces.J2](Sidereon.Forces.J2.md): Earth's oblateness (J2) perturbation force model.

- [Sidereon.Forces.TwoBody](Sidereon.Forces.TwoBody.md): Standard Keplerian Two-Body gravity force model.

- [Sidereon.Format.OMM.Epoch](Sidereon.Format.OMM.Epoch.md): UTC calendar epoch carried by an OMM `EPOCH` field.
- [Sidereon.FrameCatalog.HelmertParameters](Sidereon.FrameCatalog.HelmertParameters.md): Helmert parameters in the published table units.

- [Sidereon.FrameCatalog.HelmertRates](Sidereon.FrameCatalog.HelmertRates.md): Helmert parameter rates in the published table units.

- [Sidereon.FrameCatalog.HelmertTransform](Sidereon.FrameCatalog.HelmertTransform.md): One published Helmert transform catalog entry.

- [Sidereon.FrameCatalog.TerrestrialFrame](Sidereon.FrameCatalog.TerrestrialFrame.md): Supported terrestrial frame labels.

- [Sidereon.FrameCatalog.TerrestrialState](Sidereon.FrameCatalog.TerrestrialState.md): Transformed terrestrial position and optional station velocity.

- [Sidereon.GNSS.ARAIM](Sidereon.GNSS.ARAIM.md): ARAIM snapshot integrity protection levels.
- [Sidereon.GNSS.ARAIM.ConstellationIsm](Sidereon.GNSS.ARAIM.ConstellationIsm.md): Per-constellation ARAIM ISM defaults.
- [Sidereon.GNSS.ARAIM.FaultMode](Sidereon.GNSS.ARAIM.FaultMode.md): Per-hypothesis ARAIM monitor data.
- [Sidereon.GNSS.ARAIM.Geometry](Sidereon.GNSS.ARAIM.Geometry.md): ARAIM snapshot geometry.
- [Sidereon.GNSS.ARAIM.IntegrityAllocation](Sidereon.GNSS.ARAIM.IntegrityAllocation.md): ARAIM integrity and continuity risk allocation.
- [Sidereon.GNSS.ARAIM.Ism](Sidereon.GNSS.ARAIM.Ism.md): ARAIM integrity support message input.
- [Sidereon.GNSS.ARAIM.Result](Sidereon.GNSS.ARAIM.Result.md): ARAIM protection-level result.
- [Sidereon.GNSS.ARAIM.Row](Sidereon.GNSS.ARAIM.Row.md): One satellite row in an ARAIM geometry snapshot.
- [Sidereon.GNSS.ARAIM.SatelliteIsm](Sidereon.GNSS.ARAIM.SatelliteIsm.md): Per-satellite ARAIM ISM override.
- [Sidereon.GNSS.ARAIM.SatelliteIsmModel](Sidereon.GNSS.ARAIM.SatelliteIsmModel.md): Per-satellite integrity and accuracy model without a satellite identity.
- [Sidereon.GNSS.Antex](Sidereon.GNSS.Antex.md): Parser and lookup helpers for ANTEX 1.4 receiver and satellite antenna blocks.
- [Sidereon.GNSS.Bias](Sidereon.GNSS.Bias.md): DCB and OSB bias products backed by the core bias parsers.

- [Sidereon.GNSS.Bias.Record](Sidereon.GNSS.Bias.Record.md): One bias record decoded from a DCB or OSB product.

- [Sidereon.GNSS.Bias.Set](Sidereon.GNSS.Bias.Set.md): Parsed DCB or OSB bias product.

- [Sidereon.GNSS.Broadcast.ClockPolynomial](Sidereon.GNSS.Broadcast.ClockPolynomial.md): Broadcast satellite-clock polynomial.
- [Sidereon.GNSS.Broadcast.CnavCorrections](Sidereon.GNSS.Broadcast.CnavCorrections.md): Core-evaluated CNAV single-frequency clock corrections in seconds.

- [Sidereon.GNSS.Broadcast.CnavParameters](Sidereon.GNSS.Broadcast.CnavParameters.md): CNAV/CNAV-2 fields that have no LNAV counterpart.

- [Sidereon.GNSS.Broadcast.DetailedRecord](Sidereon.GNSS.Broadcast.DetailedRecord.md): One broadcast record with issue, time tags, group delays, and CNAV fields.

- [Sidereon.GNSS.Broadcast.GlonassRecord](Sidereon.GNSS.Broadcast.GlonassRecord.md): One GLONASS broadcast state-vector record.
- [Sidereon.GNSS.Broadcast.GroupDelays](Sidereon.GNSS.Broadcast.GroupDelays.md): Broadcast group-delay fields preserved from a NAV record.

- [Sidereon.GNSS.Broadcast.IonoCorrections](Sidereon.GNSS.Broadcast.IonoCorrections.md): Broadcast ionosphere coefficients parsed from a RINEX NAV header.
- [Sidereon.GNSS.Broadcast.Issue](Sidereon.GNSS.Broadcast.Issue.md): Broadcast issue value plus the navigation-message family that carried it.

- [Sidereon.GNSS.Broadcast.KeplerianElements](Sidereon.GNSS.Broadcast.KeplerianElements.md): Broadcast Keplerian orbital elements.
- [Sidereon.GNSS.Broadcast.KlobucharAlphaBeta](Sidereon.GNSS.Broadcast.KlobucharAlphaBeta.md): Klobuchar alpha and beta ionosphere coefficients.
- [Sidereon.GNSS.Broadcast.Record](Sidereon.GNSS.Broadcast.Record.md): One GPS, Galileo, or BeiDou broadcast ephemeris record from RINEX NAV.
- [Sidereon.GNSS.Broadcast.State](Sidereon.GNSS.Broadcast.State.md): A broadcast-evaluated satellite state at one epoch.
- [Sidereon.GNSS.Broadcast.WeekTow](Sidereon.GNSS.Broadcast.WeekTow.md): GNSS week and time-of-week tagged with its native time scale.

- [Sidereon.GNSS.BroadcastComparison](Sidereon.GNSS.BroadcastComparison.md): Broadcast-ephemeris accuracy: compare a broadcast navigation product against a
precise SP3 product over a window.
- [Sidereon.GNSS.BroadcastComparison.Report](Sidereon.GNSS.BroadcastComparison.Report.md): The result of a broadcast and precise product comparison.
- [Sidereon.GNSS.BroadcastComparison.Stats](Sidereon.GNSS.BroadcastComparison.Stats.md): Orbit and clock difference statistics for one satellite (or the overall set).
- [Sidereon.GNSS.Constellation.Catalog](Sidereon.GNSS.Constellation.Catalog.md): The result of a lenient catalog build: the records that resolved, plus the
OMM entries that did not.
- [Sidereon.GNSS.Constellation.Diff](Sidereon.GNSS.Constellation.Diff.md): Change report between two GNSS constellation catalog snapshots.

- [Sidereon.GNSS.Constellation.NavcenStatus](Sidereon.GNSS.Constellation.NavcenStatus.md): A parsed row from NAVCEN's GPS constellation status table.

- [Sidereon.GNSS.Constellation.Record](Sidereon.GNSS.Constellation.Record.md): A normalized GNSS satellite identity record.
- [Sidereon.GNSS.Constellation.SkippedOmm](Sidereon.GNSS.Constellation.SkippedOmm.md): An OMM entry that `Sidereon.GNSS.Constellation.from_celestrak_omm_lenient/2`
could not resolve to a `Record` for the requested system.
- [Sidereon.GNSS.Constellation.Validation](Sidereon.GNSS.Constellation.Validation.md): Validation report for a GNSS constellation catalog.
- [Sidereon.GNSS.Data.AbsentCenter](Sidereon.GNSS.Data.AbsentCenter.md): SP3 center that did not contribute to a merge.

- [Sidereon.GNSS.Data.Contributor](Sidereon.GNSS.Data.Contributor.md): SP3 center that contributed a product to a merge.

- [Sidereon.GNSS.Data.MergeReport](Sidereon.GNSS.Data.MergeReport.md): Audit report for merged SP3 acquisition.

- [Sidereon.GNSS.Data.Product](Sidereon.GNSS.Data.Product.md): Pure identity for one GNSS archive product.

- [Sidereon.GNSS.Data.TerrainFetchReport](Sidereon.GNSS.Data.TerrainFetchReport.md): Result partition for region and tile-list terrain prefetches.

- [Sidereon.GNSS.Ephemeris](Sidereon.GNSS.Ephemeris.md): A unified satellite-ephemeris sampling surface over precise SP3 products and
broadcast navigation messages.
- [Sidereon.GNSS.Ephemeris.Row](Sidereon.GNSS.Ephemeris.Row.md): One sampled satellite state at one epoch in the unified ephemeris table.
- [Sidereon.GNSS.Fusion.Filter](Sidereon.GNSS.Fusion.Filter.md): Opaque native GNSS/INS fusion filter handle.

- [Sidereon.GNSS.Fusion.FusionRtsEpoch](Sidereon.GNSS.Fusion.FusionRtsEpoch.md): One recorded GNSS/INS fusion epoch for RTS smoothing.

- [Sidereon.GNSS.Fusion.FusionRtsHistory](Sidereon.GNSS.Fusion.FusionRtsHistory.md): Recorded forward-pass history accepted by the fusion RTS smoother.

- [Sidereon.GNSS.Fusion.FusionRtsHistoryBuilder](Sidereon.GNSS.Fusion.FusionRtsHistoryBuilder.md): Builder for a recorded GNSS/INS fusion forward pass.

- [Sidereon.GNSS.Fusion.GnssFixMeasurement](Sidereon.GNSS.Fusion.GnssFixMeasurement.md): GNSS PVT measurement used by loose-coupled fusion updates.

- [Sidereon.GNSS.Fusion.ImuSample](Sidereon.GNSS.Fusion.ImuSample.md): IMU rate or increment sample accepted by the fusion propagator.

- [Sidereon.GNSS.Fusion.SmoothedFusionEpoch](Sidereon.GNSS.Fusion.SmoothedFusionEpoch.md): One fixed-interval smoothed GNSS/INS fusion epoch.

- [Sidereon.GNSS.Fusion.SmoothedFusionTrajectory](Sidereon.GNSS.Fusion.SmoothedFusionTrajectory.md): Fixed-interval RTS-smoothed GNSS/INS fusion trajectory.

- [Sidereon.GNSS.Fusion.TightCarrierPhaseObservation](Sidereon.GNSS.Fusion.TightCarrierPhaseObservation.md): Carrier-phase range row with a caller-supplied float ambiguity.

- [Sidereon.GNSS.Fusion.TightGnssEpoch](Sidereon.GNSS.Fusion.TightGnssEpoch.md): One receiver epoch of raw GNSS observations for a tight update.

- [Sidereon.GNSS.Fusion.TightGnssObservation](Sidereon.GNSS.Fusion.TightGnssObservation.md): Raw GNSS observation for one satellite in a tight update.

- [Sidereon.GNSS.Fusion.TightRangeRateObservation](Sidereon.GNSS.Fusion.TightRangeRateObservation.md): Doppler-derived range-rate row for one satellite in a tight update.

- [Sidereon.GNSS.Fusion.TimeSyncHistoryConfig](Sidereon.GNSS.Fusion.TimeSyncHistoryConfig.md): Retained-history limits for bounded-latency time synchronization.

- [Sidereon.GNSS.Fusion.VelocityMatchState](Sidereon.GNSS.Fusion.VelocityMatchState.md): One position and velocity sample used by outage velocity matching.

- [Sidereon.GNSS.Fusion.VelocityMatchingConfig](Sidereon.GNSS.Fusion.VelocityMatchingConfig.md): Endpoint velocity matching settings for one GNSS outage.

- [Sidereon.GNSS.Ionosphere.TecGridSamples](Sidereon.GNSS.Ionosphere.TecGridSamples.md): Whole-grid IONEX vertical-TEC samples.
- [Sidereon.GNSS.Ionosphere.TecSample](Sidereon.GNSS.Ionosphere.TecSample.md): One IONEX vertical-TEC grid-node sample.
- [Sidereon.GNSS.NMEA](Sidereon.GNSS.NMEA.md): NMEA 0183 parsing, epoch accumulation, and GGA writing.

- [Sidereon.GNSS.NMEA.Accumulator](Sidereon.GNSS.NMEA.Accumulator.md): Resource-backed incremental NMEA accumulator.

- [Sidereon.GNSS.NMEA.Sentence](Sidereon.GNSS.NMEA.Sentence.md): One decoded NMEA sentence.

- [Sidereon.GNSS.NMEA.Snapshot](Sidereon.GNSS.NMEA.Snapshot.md): One accumulated NMEA epoch snapshot.

- [Sidereon.GNSS.Ntrip](Sidereon.GNSS.Ntrip.md): NTRIP client helpers and stream process.
- [Sidereon.GNSS.Ntrip.CasRecord](Sidereon.GNSS.Ntrip.CasRecord.md): NTRIP CAS record.
- [Sidereon.GNSS.Ntrip.GgaPosition](Sidereon.GNSS.Ntrip.GgaPosition.md): Position fields for NTRIP VRS GGA output.

- [Sidereon.GNSS.Ntrip.NetRecord](Sidereon.GNSS.Ntrip.NetRecord.md): NTRIP NET record.
- [Sidereon.GNSS.Ntrip.OtherRecord](Sidereon.GNSS.Ntrip.OtherRecord.md): Unknown NTRIP sourcetable record with fields preserved.
- [Sidereon.GNSS.Ntrip.Sourcetable](Sidereon.GNSS.Ntrip.Sourcetable.md): Parsed NTRIP sourcetable resource and record list.

- [Sidereon.GNSS.Ntrip.StrRecord](Sidereon.GNSS.Ntrip.StrRecord.md): NTRIP STR record.
- [Sidereon.GNSS.Ntrip.Stream](Sidereon.GNSS.Ntrip.Stream.md): GenServer that owns an NTRIP stream connection.

- [Sidereon.GNSS.PPPCorrections](Sidereon.GNSS.PPPCorrections.md): Precomputed, state-independent PPP per-range corrections for the static-arc
float/fixed solve: solid-earth tide, carrier-phase wind-up, and satellite
antenna PCO/PCV.
- [Sidereon.GNSS.Positioning.DopplerSolution](Sidereon.GNSS.Positioning.DopplerSolution.md): A receiver position solution paired with an optional Doppler velocity solve.
- [Sidereon.GNSS.Positioning.Solution](Sidereon.GNSS.Positioning.Solution.md): A single-point-positioning solution at one receive epoch.
- [Sidereon.GNSS.Positioning.SourcedSolution](Sidereon.GNSS.Positioning.SourcedSolution.md): A single-point-positioning solution paired with the provenance of the
ephemeris that produced it.
- [Sidereon.GNSS.PreciseEphemerisSample](Sidereon.GNSS.PreciseEphemerisSample.md): One precise-ephemeris sample: a satellite's ECEF position (and optional clock)
at one epoch, in SI units.
- [Sidereon.GNSS.PrecisePositioning.FixedSolution](Sidereon.GNSS.PrecisePositioning.FixedSolution.md): Static multi-epoch integer-fixed carrier-phase solution.

- [Sidereon.GNSS.PrecisePositioning.MultiEpochSolution](Sidereon.GNSS.PrecisePositioning.MultiEpochSolution.md): Static multi-epoch float-ambiguity phase positioning solution.

- [Sidereon.GNSS.PrecisePositioning.Solution](Sidereon.GNSS.PrecisePositioning.Solution.md): Float-ambiguity phase positioning solution for one epoch.

- [Sidereon.GNSS.QC.ClockJump](Sidereon.GNSS.QC.ClockJump.md): Detected receiver-clock jump.
- [Sidereon.GNSS.QC.CycleSlipQc](Sidereon.GNSS.QC.CycleSlipQc.md): Aggregate dual-frequency cycle-slip counts.
- [Sidereon.GNSS.QC.DataGap](Sidereon.GNSS.QC.DataGap.md): Detected gap between adjacent observation epochs.
- [Sidereon.GNSS.QC.MultipathReport](Sidereon.GNSS.QC.MultipathReport.md): MP1/MP2 multipath RMS report.
- [Sidereon.GNSS.QC.MultipathStats](Sidereon.GNSS.QC.MultipathStats.md): RMS statistics for one multipath series.
- [Sidereon.GNSS.QC.ObservationAntenna](Sidereon.GNSS.QC.ObservationAntenna.md): Antenna identity from `ANT # / TYPE`.
- [Sidereon.GNSS.QC.ObservationFinding](Sidereon.GNSS.QC.ObservationFinding.md): Compact lint finding retained by a QC report.
- [Sidereon.GNSS.QC.ObservationHeader](Sidereon.GNSS.QC.ObservationHeader.md): Header metadata copied into a QC report.
- [Sidereon.GNSS.QC.ObservationNote](Sidereon.GNSS.QC.ObservationNote.md): Non-fatal QC note.
- [Sidereon.GNSS.QC.ObservationReceiver](Sidereon.GNSS.QC.ObservationReceiver.md): Receiver identity from `REC # / TYPE / VERS`.
- [Sidereon.GNSS.QC.ObservationReport](Sidereon.GNSS.QC.ObservationReport.md): RINEX observation QC report.
- [Sidereon.GNSS.QC.ObservationTime](Sidereon.GNSS.QC.ObservationTime.md): Observation epoch with an optional RINEX time-scale label.
- [Sidereon.GNSS.QC.RaimInput](Sidereon.GNSS.QC.RaimInput.md): Post-solve RAIM input.
- [Sidereon.GNSS.QC.RaimResult](Sidereon.GNSS.QC.RaimResult.md): Post-solve RAIM fault-detection result.

- [Sidereon.GNSS.QC.SatelliteMultipath](Sidereon.GNSS.QC.SatelliteMultipath.md): Per-satellite MP1/MP2 RMS row.
- [Sidereon.GNSS.QC.SatelliteObservation](Sidereon.GNSS.QC.SatelliteObservation.md): Per-satellite observation completeness row.
- [Sidereon.GNSS.QC.SatelliteSignal](Sidereon.GNSS.QC.SatelliteSignal.md): Per-satellite, per-code observation completeness row.
- [Sidereon.GNSS.QC.SnrStats](Sidereon.GNSS.QC.SnrStats.md): Summary statistics over raw numeric S-code observations.
- [Sidereon.GNSS.QC.SsiHistogram](Sidereon.GNSS.QC.SsiHistogram.md): Histogram over RINEX SSI digits.
- [Sidereon.GNSS.QC.SystemCycleSlipQc](Sidereon.GNSS.QC.SystemCycleSlipQc.md): Per-constellation cycle-slip counts.
- [Sidereon.GNSS.QC.SystemMultipath](Sidereon.GNSS.QC.SystemMultipath.md): Per-constellation MP1/MP2 RMS row.
- [Sidereon.GNSS.QC.SystemObservation](Sidereon.GNSS.QC.SystemObservation.md): Per-constellation observation completeness row.
- [Sidereon.GNSS.QC.SystemSignal](Sidereon.GNSS.QC.SystemSignal.md): Per-constellation, per-code observation completeness row.
- [Sidereon.GNSS.RINEX.Clock](Sidereon.GNSS.RINEX.Clock.md): RINEX clock (`.CLK`) reader for satellite clock-bias records.
- [Sidereon.GNSS.RTCM](Sidereon.GNSS.RTCM.md): RTCM 3.x differential-GNSS stream decoding.
- [Sidereon.GNSS.RTK.ArcConfig](Sidereon.GNSS.RTK.ArcConfig.md): Complete typed configuration for a sequential RTK arc solve.

- [Sidereon.GNSS.RTK.ArcCycleSlipSplit](Sidereon.GNSS.RTK.ArcCycleSlipSplit.md): Cycle-slip split interval reported while preparing or solving an RTK arc.

- [Sidereon.GNSS.RTK.ArcEpochSolution](Sidereon.GNSS.RTK.ArcEpochSolution.md): One epoch of a sequential RTK arc solution.

- [Sidereon.GNSS.RTK.ArcPreprocessing](Sidereon.GNSS.RTK.ArcPreprocessing.md): Optional preprocessing chained ahead of the sequential RTK arc solve.

- [Sidereon.GNSS.RTK.ArcSolution](Sidereon.GNSS.RTK.ArcSolution.md): Solved sequential RTK arc.

- [Sidereon.GNSS.RTK.ArcState](Sidereon.GNSS.RTK.ArcState.md): Final carried sequential RTK arc state.

- [Sidereon.GNSS.RTK.ArcUpdateOptions](Sidereon.GNSS.RTK.ArcUpdateOptions.md): Per-epoch sequential-update controls for the RTK arc driver.

- [Sidereon.GNSS.RTK.DualCycleSlipConfig](Sidereon.GNSS.RTK.DualCycleSlipConfig.md): Optional dual-frequency cycle-slip preprocessing controls.

- [Sidereon.GNSS.RTK.FixedBaselineSolution](Sidereon.GNSS.RTK.FixedBaselineSolution.md): Integer-fixed RTK baseline solution from code/carrier double differences.

- [Sidereon.GNSS.RTK.FixedOptions](Sidereon.GNSS.RTK.FixedOptions.md): Iteration and integer-search controls for RTK fixed solving.

- [Sidereon.GNSS.RTK.FloatBaselineSolution](Sidereon.GNSS.RTK.FloatBaselineSolution.md): Float RTK baseline solution from code/carrier double differences.

- [Sidereon.GNSS.RTK.FloatOptions](Sidereon.GNSS.RTK.FloatOptions.md): Iteration controls for an RTK float solve.

- [Sidereon.GNSS.RTK.IonosphereFreeArcConfig](Sidereon.GNSS.RTK.IonosphereFreeArcConfig.md): Complete typed configuration for ionosphere-free RTK arc setup.

- [Sidereon.GNSS.RTK.IonosphereFreeArcSolution](Sidereon.GNSS.RTK.IonosphereFreeArcSolution.md): Ionosphere-free single-frequency-equivalent RTK arc prepared from fixed
wide-lane ambiguities.

- [Sidereon.GNSS.RTK.MeasurementModel](Sidereon.GNSS.RTK.MeasurementModel.md): RTK measurement weighting and correction model.

- [Sidereon.GNSS.RTK.MovingBaseline](Sidereon.GNSS.RTK.MovingBaseline.md): Moving-baseline RTK: both receivers move each epoch (RTKLIB "moving-base").
- [Sidereon.GNSS.RTK.ResidualValidationOptions](Sidereon.GNSS.RTK.ResidualValidationOptions.md): Residual validation controls for RTK fixed solving.

- [Sidereon.GNSS.RTK.StaticArcConfig](Sidereon.GNSS.RTK.StaticArcConfig.md): Complete typed configuration for a static RTK arc solve.

- [Sidereon.GNSS.RTK.StaticArcSolution](Sidereon.GNSS.RTK.StaticArcSolution.md): Solved static RTK arc.
- [Sidereon.GNSS.RTK.StaticReferenceCarrierSolution](Sidereon.GNSS.RTK.StaticReferenceCarrierSolution.md): Carrier RTK detail from a static reference-station solve.

- [Sidereon.GNSS.RTK.StaticReferenceCodeSolution](Sidereon.GNSS.RTK.StaticReferenceCodeSolution.md): Code-DGNSS detail from a static reference-station solve.

- [Sidereon.GNSS.RTK.StaticReferenceEpochDiagnostic](Sidereon.GNSS.RTK.StaticReferenceEpochDiagnostic.md): Per-epoch diagnostic row from a static reference-station mode.

- [Sidereon.GNSS.RTK.StaticReferenceModeReport](Sidereon.GNSS.RTK.StaticReferenceModeReport.md): Per-mode attempt report for the static reference-station solver.

- [Sidereon.GNSS.RTK.StaticReferenceStationCovariance](Sidereon.GNSS.RTK.StaticReferenceStationCovariance.md): Position covariance blocks for a static reference-station coordinate.

- [Sidereon.GNSS.RTK.StaticReferenceStationSolution](Sidereon.GNSS.RTK.StaticReferenceStationSolution.md): Static reference-station coordinate with covariance and mode diagnostics.

- [Sidereon.GNSS.RTK.WideLaneArcConfig](Sidereon.GNSS.RTK.WideLaneArcConfig.md): Complete typed configuration for wide-lane RTK arc fixing.

- [Sidereon.GNSS.RTK.WideLaneArcSolution](Sidereon.GNSS.RTK.WideLaneArcSolution.md): Fixed wide-lane ambiguity solution for a dual-frequency RTK arc.

- [Sidereon.GNSS.RTK.WideLaneFixedMetadata](Sidereon.GNSS.RTK.WideLaneFixedMetadata.md): Wide-lane integer metadata attached to a static RINEX RTK solve.

- [Sidereon.GNSS.RTK.WideLaneOptions](Sidereon.GNSS.RTK.WideLaneOptions.md): Wide-lane integer estimation controls.

- [Sidereon.GNSS.ReducedOrbit.Piecewise](Sidereon.GNSS.ReducedOrbit.Piecewise.md): A long position track approximated by a sequence of contiguous, independently
fitted `Sidereon.GNSS.ReducedOrbit` segments.
- [Sidereon.GNSS.SBAS](Sidereon.GNSS.SBAS.md): Satellite-based augmentation corrections.
- [Sidereon.GNSS.SBAS.AirborneModel](Sidereon.GNSS.SBAS.AirborneModel.md): SBAS airborne receiver and multipath contribution model.

- [Sidereon.GNSS.SBAS.DegradationParams](Sidereon.GNSS.SBAS.DegradationParams.md): Supplied SBAS degradation terms for protection-level error modeling.

- [Sidereon.GNSS.SBAS.LogBlock](Sidereon.GNSS.SBAS.LogBlock.md): One SBAS log block with decoded message metadata.
- [Sidereon.GNSS.SBAS.Message](Sidereon.GNSS.SBAS.Message.md): Decoded SBAS message.
- [Sidereon.GNSS.SBAS.ProtectionGeometry](Sidereon.GNSS.SBAS.ProtectionGeometry.md): SBAS protection-level geometry.
- [Sidereon.GNSS.SBAS.ProtectionRow](Sidereon.GNSS.SBAS.ProtectionRow.md): One satellite row in an SBAS protection-level geometry snapshot.
- [Sidereon.GNSS.SBAS.SbasErrorModel](Sidereon.GNSS.SBAS.SbasErrorModel.md): Index-aligned SBAS range-error model for protection-level geometry rows.

- [Sidereon.GNSS.SBAS.SbasKMultipliers](Sidereon.GNSS.SBAS.SbasKMultipliers.md): SBAS protection-level multipliers.

- [Sidereon.GNSS.SBAS.SbasPlError](Sidereon.GNSS.SBAS.SbasPlError.md): SBAS protection-level error reasons.

- [Sidereon.GNSS.SBAS.SbasProtection](Sidereon.GNSS.SBAS.SbasProtection.md): SBAS protection-level output for one geometry snapshot.

- [Sidereon.GNSS.SBAS.SbasSisError](Sidereon.GNSS.SBAS.SbasSisError.md): One satellite's SBAS one-sigma range-error budget.

- [Sidereon.GNSS.SP3.State](Sidereon.GNSS.SP3.State.md): An SP3 satellite state at one epoch.
- [Sidereon.GNSS.SPP.EpochInputs](Sidereon.GNSS.SPP.EpochInputs.md): One RINEX observation epoch assembled into SPP solve inputs.

- [Sidereon.GNSS.SPP.EpochSolution](Sidereon.GNSS.SPP.EpochSolution.md): One assembled RINEX observation epoch paired with its SPP solve result.

- [Sidereon.GNSS.SSR](Sidereon.GNSS.SSR.md): State-space GNSS corrections.
- [Sidereon.GNSS.SSR.ClockCorrection](Sidereon.GNSS.SSR.ClockCorrection.md): SSR clock correction.
- [Sidereon.GNSS.SSR.OrbitCorrection](Sidereon.GNSS.SSR.OrbitCorrection.md): SSR orbit correction.
- [Sidereon.GNSS.SSR.Solution](Sidereon.GNSS.SSR.Solution.md): SSR solution identity.
- [Sidereon.GNSS.Signal.Analysis.DllTrackingOptions](Sidereon.GNSS.Signal.Analysis.DllTrackingOptions.md): Inputs for code-tracking thermal-noise metrics.

- [Sidereon.GNSS.Signal.Analysis.InterferenceTerm](Sidereon.GNSS.Signal.Analysis.InterferenceTerm.md): Interfering signal and received power for C/N0 degradation metrics.

- [Sidereon.GNSS.Signal.Analysis.MultipathOptions](Sidereon.GNSS.Signal.Analysis.MultipathOptions.md): Inputs for one-path specular multipath envelope metrics.

- [Sidereon.GNSS.Staleness](Sidereon.GNSS.Staleness.md): Product-staleness graceful degradation for time-varying GNSS products.
- [Sidereon.GNSS.Staleness.IonexSelection](Sidereon.GNSS.Staleness.IonexSelection.md): A selected IONEX product paired with its staleness metadata.
- [Sidereon.GNSS.Staleness.Policy](Sidereon.GNSS.Staleness.Policy.md): Staleness cap for product selection.
- [Sidereon.GNSS.Staleness.Sp3Selection](Sidereon.GNSS.Staleness.Sp3Selection.md): A selected SP3 product paired with its staleness metadata.
- [Sidereon.GNSS.Staleness.StalenessMetadata](Sidereon.GNSS.Staleness.StalenessMetadata.md): Structured description of the product staleness behind a selection result.
- [Sidereon.GNSS.StaticPositioning.Solution](Sidereon.GNSS.StaticPositioning.Solution.md): Multi-epoch static receiver solution.
- [Sidereon.Geodesic.GeodesicError](Sidereon.Geodesic.GeodesicError.md): Invalid-input detail returned by geodesic solves.

- [Sidereon.Geodetic](Sidereon.Geodetic.md): WGS84 geodetic position: latitude, longitude, altitude.

- [Sidereon.GeodeticTimeSeries](Sidereon.GeodeticTimeSeries.md): Geodetic position time-series velocity, trajectory, step, and network tools.
- [Sidereon.GeodeticTimeSeries.MidasComponentStats](Sidereon.GeodeticTimeSeries.MidasComponentStats.md): MIDAS pair-selection diagnostics for one ENU component.

- [Sidereon.GeodeticTimeSeries.MidasOptions](Sidereon.GeodeticTimeSeries.MidasOptions.md): Options for the MIDAS velocity estimator.

- [Sidereon.GeodeticTimeSeries.MotionField](Sidereon.GeodeticTimeSeries.MotionField.md): Network motion field in one output ENU frame.

- [Sidereon.GeodeticTimeSeries.NetworkStation](Sidereon.GeodeticTimeSeries.NetworkStation.md): One station input for network motion-field estimation.

- [Sidereon.GeodeticTimeSeries.PositionSample](Sidereon.GeodeticTimeSeries.PositionSample.md): One position sample in a geodetic time series.

- [Sidereon.GeodeticTimeSeries.StepCandidate](Sidereon.GeodeticTimeSeries.StepCandidate.md): Candidate displacement step from the labelled detector heuristic.

- [Sidereon.GeodeticTimeSeries.StepDetectionOptions](Sidereon.GeodeticTimeSeries.StepDetectionOptions.md): Options for displacement step detection.

- [Sidereon.GeodeticTimeSeries.Trajectory](Sidereon.GeodeticTimeSeries.Trajectory.md): Fitted trajectory coefficients and solver diagnostics.

- [Sidereon.GeodeticTimeSeries.TrajectoryFitOptions](Sidereon.GeodeticTimeSeries.TrajectoryFitOptions.md): Least-squares controls for trajectory fitting.

- [Sidereon.GeodeticTimeSeries.TrajectoryModel](Sidereon.GeodeticTimeSeries.TrajectoryModel.md): Linear trajectory model shape.

- [Sidereon.GeodeticTimeSeries.Velocity](Sidereon.GeodeticTimeSeries.Velocity.md): Robust ENU velocity estimate.

- [Sidereon.Geofence.Fence](Sidereon.Geofence.Fence.md): A constructed WGS84 geodesic polygon fence.
- [Sidereon.Geofence.Hysteresis](Sidereon.Geofence.Hysteresis.md): Confidence thresholds for probabilistic fence crossing.
- [Sidereon.Geoid](Sidereon.Geoid.md): Geoid undulation lookup and orthometric/ellipsoidal height conversion.
- [Sidereon.Geoid.Egm2008GridSpacing](Sidereon.Geoid.Egm2008GridSpacing.md): Supported NGA EGM2008 interpolation-raster spacings.

- [Sidereon.Geoid.Egm2008RasterWindow](Sidereon.Geoid.Egm2008RasterWindow.md): Descriptor for a full or cropped EGM2008 raster window.

- [Sidereon.Geoid.ProjVgridshiftError](Sidereon.Geoid.ProjVgridshiftError.md): Invalid coordinate reported by PROJ-compatible vertical-grid interpolation.

- [Sidereon.GeometryQuality](Sidereon.GeometryQuality.md): Geometry observability and covariance-validation diagnostics.
- [Sidereon.ILS](Sidereon.ILS.md): Integer least-squares search helpers.

- [Sidereon.LeastSquares](Sidereon.LeastSquares.md): Generic data-driven trust-region least squares.
- [Sidereon.LeastSquares.DropOneReport](Sidereon.LeastSquares.DropOneReport.md): A leave-one-out sweep: the `base` solve over all rows, one `drops` solve per
masked residual row (in row order), and `cost_delta` giving how much the
optimum cost moves when each row is removed.

- [Sidereon.LeastSquares.Result](Sidereon.LeastSquares.Result.md): A single converged trust-region solve.
- [Sidereon.LookAngle](Sidereon.LookAngle.md): Topocentric look angle from a ground station to a satellite.

- [Sidereon.Observation](Sidereon.Observation.md): Observational-astronomy geometry primitives.
- [Sidereon.OrbitDetermination](Sidereon.OrbitDetermination.md): Precise orbit fitting and residual ledgers.
- [Sidereon.OrbitDetermination.OrbitFitCovariance](Sidereon.OrbitDetermination.OrbitFitCovariance.md): Fitted state covariance or an unbounded marker.

- [Sidereon.OrbitDetermination.OrbitFitReport](Sidereon.OrbitDetermination.OrbitFitReport.md): Batch orbit-fit report.

- [Sidereon.OrbitDetermination.OrbitFitSolution](Sidereon.OrbitDetermination.OrbitFitSolution.md): Initial-state orbit fit for one satellite.

- [Sidereon.OrbitDetermination.OrbitResidualLedger](Sidereon.OrbitDetermination.OrbitResidualLedger.md): Residual summary grouped by satellite and constellation.

- [Sidereon.OrbitDetermination.OrbitResidualStats](Sidereon.OrbitDetermination.OrbitResidualStats.md): RTN residual RMS summary.

- [Sidereon.OrbitalElements](Sidereon.OrbitalElements.md): Classical (Keplerian) orbital elements and the two-body state transforms.
- [Sidereon.Pass](Sidereon.Pass.md): A satellite pass over a ground station.

- [Sidereon.Propagator](Sidereon.Propagator.md): High-precision numerical orbit propagation.
- [Sidereon.Reliability](Sidereon.Reliability.md): Classical Baarda/Teunissen reliability diagnostics.
- [Sidereon.Reliability.ObservationReliability](Sidereon.Reliability.ObservationReliability.md): Reliability diagnostics for one observation.
- [Sidereon.Reliability.RangeReliabilityRow](Sidereon.Reliability.RangeReliabilityRow.md): One range row for pre-data reliability design.
- [Sidereon.Reliability.ReliabilityOptions](Sidereon.Reliability.ReliabilityOptions.md): Options for classical reliability calculations.
- [Sidereon.Reliability.ReliabilityReport](Sidereon.Reliability.ReliabilityReport.md): Full reliability report.

- [Sidereon.Reliability.ReliabilitySummary](Sidereon.Reliability.ReliabilitySummary.md): Aggregate reliability diagnostics for a design.

- [Sidereon.SGP4.Fit](Sidereon.SGP4.Fit.md): Result of inverse SGP4 TLE fitting.

- [Sidereon.Sidereal](Sidereon.Sidereal.md): Sidereal repeat-period helpers and residual filtering.
- [Sidereon.Sidereal.FilterOptions](Sidereon.Sidereal.FilterOptions.md): Options for sidereal residual filtering.

- [Sidereon.Sidereal.FilterOutput](Sidereon.Sidereal.FilterOutput.md): Output from sidereal residual filtering.

- [Sidereon.SpaceWeather](Sidereon.SpaceWeather.md): Space-weather tables for drag and decay inputs.
- [Sidereon.SpaceWeather.Coverage](Sidereon.SpaceWeather.Coverage.md): J2000-second coverage bounds for a parsed space-weather table.

- [Sidereon.SpaceWeather.Policy](Sidereon.SpaceWeather.Policy.md): Lookup policy for rejecting lower-trust rows or monthly Ap defaults.

- [Sidereon.SpaceWeather.Sample](Sidereon.SpaceWeather.Sample.md): Space-weather values plus source metadata for one lookup.

- [Sidereon.Statistics](Sidereon.Statistics.md): Residual-distribution diagnostics: sample moments and normality tests.
- [Sidereon.Terrain.Dted](Sidereon.Terrain.Dted.md): Handle for a DTED terrain directory.
- [Sidereon.Terrain.DtedLookupOptions](Sidereon.Terrain.DtedLookupOptions.md): Options for DTED height lookup.

- [Sidereon.Terrain.DtedTile](Sidereon.Terrain.DtedTile.md): Handle for one loaded DTED tile.

- [Sidereon.Terrain.MmapTerrain.Egm96FifteenMinuteGeoid](Sidereon.Terrain.MmapTerrain.Egm96FifteenMinuteGeoid.md): Loaded EGM96 15-minute `WW15MGH.DAC` geoid grid.
- [Sidereon.Terrain.MmapTerrain.EllipsoidalHeightM](Sidereon.Terrain.MmapTerrain.EllipsoidalHeightM.md): WGS84 ellipsoidal terrain height `h` in metres.

- [Sidereon.Terrain.MmapTerrain.OrthometricHeightM](Sidereon.Terrain.MmapTerrain.OrthometricHeightM.md): Orthometric terrain height `H` in metres above the EGM96 mean sea level geoid.

- [Sidereon.Terrain.MmapTerrain.TerrainDatumError](Sidereon.Terrain.MmapTerrain.TerrainDatumError.md): Terrain vertical-datum conversion and optional geoid-grid loading error.

- [Sidereon.Terrain.MmapTerrain.TerrainGeoidModel](Sidereon.Terrain.MmapTerrain.TerrainGeoidModel.md): Geoid tier used for terrain orthometric-to-ellipsoidal conversion.

- [Sidereon.Terrain.MmapTerrain.TerrainStoreError](Sidereon.Terrain.MmapTerrain.TerrainStoreError.md): Terrain store conversion, parse, and checksum error.

- [Sidereon.Terrain.MmapTerrain.TerrainStoreTileIndex](Sidereon.Terrain.MmapTerrain.TerrainStoreTileIndex.md): Metadata for one tile record in a terrain store.

- [Sidereon.Terrain.MmapTerrain.VerticalDatum](Sidereon.Terrain.MmapTerrain.VerticalDatum.md): Vertical datum carried by terrain store tile records.

- Core
  - [Sidereon](Sidereon.md): Satellite toolkit for Elixir. SGP4 orbit propagation, coordinate
transformations, and ground station pass prediction.

  - [Sidereon.Elements](Sidereon.Elements.md): Canonical representation of satellite orbital elements.
  - [Sidereon.SGP4](Sidereon.SGP4.md): SGP4/SDP4 orbit propagation from Two-Line Element sets.

  - [Sidereon.TemeState](Sidereon.TemeState.md): Represents the position and velocity of a satellite in the TEME coordinate system.

- Coordinates
  - [Sidereon.Coordinates](Sidereon.Coordinates.md): Coordinate frame transformations for satellite state vectors.
  - [Sidereon.FrameCatalog](Sidereon.FrameCatalog.md): Epoch-aware terrestrial reference-frame transforms.
  - [Sidereon.Geodesic](Sidereon.Geodesic.md): WGS84 geodesic direct and inverse solves.

- Ground Station
  - [Sidereon.Doppler](Sidereon.Doppler.md): Doppler shift calculation for satellite-ground links.
  - [Sidereon.Geofence](Sidereon.Geofence.md): WGS84 geodesic polygon geofencing with position uncertainty.
  - [Sidereon.Passes](Sidereon.Passes.md): Satellite pass prediction over a ground station.
  - [Sidereon.RF](Sidereon.RF.md): RF link budget primitives.

- Orbit Determination
  - [Sidereon.IOD](Sidereon.IOD.md): Initial Orbit Determination methods.
  - [Sidereon.Lambert](Sidereon.Lambert.md): Lambert problem solver (Battin's method).

- Space Environment
  - [Sidereon.Angles](Sidereon.Angles.md): Angular geometry calculations for satellites.
  - [Sidereon.Atmosphere](Sidereon.Atmosphere.md): Atmospheric density via the NRLMSISE-00 empirical model.
  - [Sidereon.Eclipse](Sidereon.Eclipse.md): Earth shadow (eclipse) prediction for satellites.
  - [Sidereon.Ephemeris](Sidereon.Ephemeris.md): JPL/NAIF SPK (DAF `.bsp`) ephemeris kernel reader.

- Conjunction
  - [Sidereon.Conjunction](Sidereon.Conjunction.md): Time-of-closest-approach and conjunction screening helpers.

- GNSS Positioning
  - [Sidereon.GNSS.Broadcast](Sidereon.GNSS.Broadcast.md): A parsed RINEX broadcast-navigation product (GPS LNAV, Galileo I/NAV+F/NAV,
BeiDou D1/D2, GLONASS).
  - [Sidereon.GNSS.CarrierPhase](Sidereon.GNSS.CarrierPhase.md): Dual-frequency carrier-phase linear combinations and the precise-positioning
prep tooling built on them: geometry-free and wide-lane phase, the
narrow-lane code, Melbourne-Wubbena, cycle-slip detection, and Hatch
carrier-smoothed code.
  - [Sidereon.GNSS.Constellation](Sidereon.GNSS.Constellation.md): GNSS constellation identity catalogs and validation helpers.
  - [Sidereon.GNSS.DGNSS](Sidereon.GNSS.DGNSS.md): Code-differential GNSS (DGPS) positioning over single-frequency pseudoranges.
  - [Sidereon.GNSS.Data](Sidereon.GNSS.Data.md): Cache-first acquisition for GNSS products and DTED terrain tiles.
  - [Sidereon.GNSS.Frequencies](Sidereon.GNSS.Frequencies.md): Canonical GNSS carrier-frequency lookups.
  - [Sidereon.GNSS.Fusion](Sidereon.GNSS.Fusion.md): Stateful GNSS/INS fusion filters.
  - [Sidereon.GNSS.Geometry](Sidereon.GNSS.Geometry.md): Satellite-geometry and mission-planning layer above the GNSS observables:
from a static receiver position and a precise (SP3) ephemeris, answer the
three planning questions: which satellites are visible, how good is the
geometry (dilution of precision), and when does each satellite rise and set.
  - [Sidereon.GNSS.Ionosphere](Sidereon.GNSS.Ionosphere.md): Single-frequency ionospheric group-delay corrections.
  - [Sidereon.GNSS.IonosphereFree](Sidereon.GNSS.IonosphereFree.md): The dual-frequency ionosphere-free linear combination for code and phase.
  - [Sidereon.GNSS.Navigation.LNAV](Sidereon.GNSS.Navigation.LNAV.md): GPS L1 C/A LNAV navigation message synthesis and decoding (subframes 1-3).
  - [Sidereon.GNSS.Navigation.LNAV.Ephemeris](Sidereon.GNSS.Navigation.LNAV.Ephemeris.md): GPS LNAV clock and ephemeris parameters in engineering units.
  - [Sidereon.GNSS.Observables](Sidereon.GNSS.Observables.md): Predict the GNSS observables a receiver at a known ECEF position would see for
a satellite, from a precise (SP3) or broadcast ephemeris source.
  - [Sidereon.GNSS.Positioning](Sidereon.GNSS.Positioning.md): GNSS single-point positioning (SPP): recover a receiver position, clock bias,
and geometry diagnostics from one epoch of pseudorange observations against a
precise SP3 ephemeris or a broadcast navigation product.
  - [Sidereon.GNSS.PreciseEphemeris](Sidereon.GNSS.PreciseEphemeris.md): A precise-ephemeris source built directly from samples, with no SP3 text in the
loop.
  - [Sidereon.GNSS.PreciseEphemeris.Interpolant](Sidereon.GNSS.PreciseEphemeris.Interpolant.md): Cached precise-ephemeris interpolant and batched satellite-state queries.
  - [Sidereon.GNSS.PreciseEphemeris.InterpolantArtifact](Sidereon.GNSS.PreciseEphemeris.InterpolantArtifact.md): Opened precise-ephemeris interpolant artifact.
  - [Sidereon.GNSS.PreciseEphemeris.PreciseInterpolantArtifact](Sidereon.GNSS.PreciseEphemeris.PreciseInterpolantArtifact.md): Canonical precise-interpolant artifact facade.
  - [Sidereon.GNSS.PreciseEphemeris.StateBatch](Sidereon.GNSS.PreciseEphemeris.StateBatch.md): Contiguous satellite-state arrays returned by a batched ephemeris query.
  - [Sidereon.GNSS.PrecisePositioning](Sidereon.GNSS.PrecisePositioning.md): Carrier-phase precise-positioning primitives.
  - [Sidereon.GNSS.QC](Sidereon.GNSS.QC.md): Measurement-quality control for single-point positioning.
  - [Sidereon.GNSS.RINEX.Observations](Sidereon.GNSS.RINEX.Observations.md): RINEX 3 observation products: parse a station's observation file, expose its
header (including the surveyed `APPROX POSITION XYZ`, optional antenna
`DELTA H/E/N` offset, and carrier phase-shift records), and extract the
single-frequency pseudoranges that `Sidereon.GNSS.Positioning.solve/4` consumes.
  - [Sidereon.GNSS.RTK](Sidereon.GNSS.RTK.md): RTK-facing carrier/code double-difference primitives.
  - [Sidereon.GNSS.ReducedOrbit](Sidereon.GNSS.ReducedOrbit.md): A compact, fitted mean-element approximation of a satellite's orbit.
  - [Sidereon.GNSS.SP3](Sidereon.GNSS.SP3.md): SP3-c / SP3-d precise-ephemeris products (IGS precise orbits + clocks).
  - [Sidereon.GNSS.SPP](Sidereon.GNSS.SPP.md): RINEX observation convenience entry points for GNSS single-point positioning.
  - [Sidereon.GNSS.Scenario](Sidereon.GNSS.Scenario.md): Deterministic synthetic GNSS observable scenarios.
  - [Sidereon.GNSS.Signal.Analysis](Sidereon.GNSS.Signal.Analysis.md): Closed-form GNSS signal spectrum and tracking metrics.
  - [Sidereon.GNSS.Signal.CA](Sidereon.GNSS.Signal.CA.md): GPS L1 coarse/acquisition (C/A) code generation and correlation.
  - [Sidereon.GNSS.Signal.Correlator](Sidereon.GNSS.Signal.Correlator.md): Baseband simulation, correlation, and acquisition for the GPS L1 C/A signal.
  - [Sidereon.GNSS.StaticPositioning](Sidereon.GNSS.StaticPositioning.md): Multi-epoch static GNSS single-point positioning.
  - [Sidereon.GNSS.Time](Sidereon.GNSS.Time.md): Epoch conversions shared by the GNSS correction wrappers.
  - [Sidereon.GNSS.Troposphere](Sidereon.GNSS.Troposphere.md): Neutral-atmosphere (tropospheric) signal-delay corrections.
  - [Sidereon.GNSS.Velocity](Sidereon.GNSS.Velocity.md): Recover receiver velocity and clock drift from one epoch of range-rate or
Doppler observations against a precise SP3 or broadcast ephemeris source.

- Data Sources
  - [Sidereon.Constellation](Sidereon.Constellation.md): Manage and propagate satellite constellations.
  - [Sidereon.Terrain](Sidereon.Terrain.md): DTED terrain loading and elevation lookup.

  - [Sidereon.Terrain.MmapTerrain](Sidereon.Terrain.MmapTerrain.md): Memory-mappable terrain store conversion and lookup.

- Estimation
  - [Sidereon.Estimation](Sidereon.Estimation.md): Scalar estimation and detection primitives.
  - [Sidereon.Estimation.AlphaBetaGains](Sidereon.Estimation.AlphaBetaGains.md): Alpha-beta gain set for one scalar channel.
  - [Sidereon.Estimation.AlphaBetaState](Sidereon.Estimation.AlphaBetaState.md): State of a scalar alpha-beta level and rate estimator.
  - [Sidereon.Estimation.AlphaBetaStep](Sidereon.Estimation.AlphaBetaStep.md): Result of one alpha-beta predict and update step.
  - [Sidereon.Estimation.NisGate](Sidereon.Estimation.NisGate.md): Normalized innovation squared gate result.
  - [Sidereon.Estimation.ScalarKalmanGains](Sidereon.Estimation.ScalarKalmanGains.md): Steady-state gains for a scalar constant-velocity Kalman filter.
  - [Sidereon.Estimation.SmoothedTrack](Sidereon.Estimation.SmoothedTrack.md): Fixed-interval RTS-smoothed track.

  - [Sidereon.Estimation.SmoothedTrackEpoch](Sidereon.Estimation.SmoothedTrackEpoch.md): One fixed-interval smoothed track epoch.

  - [Sidereon.Estimation.TrackFilter](Sidereon.Estimation.TrackFilter.md): Stateful no-IMU constant-velocity track filter.
  - [Sidereon.Estimation.TrackFilterConfig](Sidereon.Estimation.TrackFilterConfig.md): Configuration for a no-IMU constant-velocity track filter.
  - [Sidereon.Estimation.TrackGatedUpdate](Sidereon.Estimation.TrackGatedUpdate.md): NIS-gated track update result.

  - [Sidereon.Estimation.TrackInnovation](Sidereon.Estimation.TrackInnovation.md): Measurement residual, residual covariance, and NIS for a track update.

  - [Sidereon.Estimation.TrackPrediction](Sidereon.Estimation.TrackPrediction.md): Result of one constant-velocity track prediction.

  - [Sidereon.Estimation.TrackRtsEpoch](Sidereon.Estimation.TrackRtsEpoch.md): One recorded forward-filter epoch for RTS smoothing.

  - [Sidereon.Estimation.TrackRtsHistory](Sidereon.Estimation.TrackRtsHistory.md): Recorded forward-filter history accepted by the RTS smoother.

  - [Sidereon.Estimation.TrackRtsHistoryBuilder](Sidereon.Estimation.TrackRtsHistoryBuilder.md): Builder for a forward track-filter pass that can be RTS-smoothed.

  - [Sidereon.Estimation.TrackState](Sidereon.Estimation.TrackState.md): Track state and covariance over `[position, velocity]`.

  - [Sidereon.Estimation.TrackUpdate](Sidereon.Estimation.TrackUpdate.md): Applied track update with predicted and updated states.

  - [Sidereon.SourceLocalization](Sidereon.SourceLocalization.md): Source localization from time of arrival or time difference of arrival.
  - [Sidereon.SourceLocalization.Covariance](Sidereon.SourceLocalization.Covariance.md): State covariance or CRLB from a source-localization solve.
  - [Sidereon.SourceLocalization.Crlb](Sidereon.SourceLocalization.Crlb.md): Timing CRLB and DOP for a proposed source and sensor geometry.
  - [Sidereon.SourceLocalization.GeometryQuality](Sidereon.SourceLocalization.GeometryQuality.md): Compatibility namespace for source-localization geometry diagnostics.
  - [Sidereon.SourceLocalization.InitialGuess](Sidereon.SourceLocalization.InitialGuess.md): Closed-form seed used to start a source-localization solve.
  - [Sidereon.SourceLocalization.Options](Sidereon.SourceLocalization.Options.md): Options for ToA or TDOA source localization.
  - [Sidereon.SourceLocalization.Residual](Sidereon.SourceLocalization.Residual.md): Solver residual associated with a sensor row.
  - [Sidereon.SourceLocalization.Sensor](Sidereon.SourceLocalization.Sensor.md): Sensor with a known Cartesian position.
  - [Sidereon.SourceLocalization.SensorInfluence](Sidereon.SourceLocalization.SensorInfluence.md): Per-sensor leave-one-out diagnostic.
  - [Sidereon.SourceLocalization.Solution](Sidereon.SourceLocalization.Solution.md): Source-localization solution.

- Batch Analysis
  - [Sidereon.Coverage](Sidereon.Coverage.md): Batch single-epoch coverage helpers backed by the Rust core.

- Format
  - [Sidereon.CCSDS.CDM](Sidereon.CCSDS.CDM.md): Parse and encode CCSDS Conjunction Data Messages (CDM).
  - [Sidereon.CCSDS.OEM](Sidereon.CCSDS.OEM.md): Parse and encode CCSDS Orbit Ephemeris Messages (OEM).
  - [Sidereon.CCSDS.OPM](Sidereon.CCSDS.OPM.md): Parse and encode CCSDS Orbit Parameter Messages (OPM).
  - [Sidereon.CCSDS.TDM](Sidereon.CCSDS.TDM.md): Parse and encode CCSDS Tracking Data Messages (TDM) in KVN format.
  - [Sidereon.Format.OMM](Sidereon.Format.OMM.md): Parse and encode CCSDS Orbit Mean-Elements Messages (OMM).
  - [Sidereon.Format.TLE](Sidereon.Format.TLE.md): Parse and encode Two-Line Element sets.

