A single-point-positioning solution at one receive epoch.

position is the converged ITRF/IGS ECEF position in meters. geodetic is the same point as %{lat_rad, lon_rad, height_m} when geodetic output was requested (the default), otherwise nil. rx_clock_s is the reference-system receiver clock bias in seconds; system_clocks_s is a map of GNSS letter (e.g. "G", "E") to that system's absolute receiver clock in seconds (a single entry for a one-system solve, one per constellation for a mixed solve). These are per-system clocks, not biases: the inter-system bias of a system is its clock minus the reference system's (rx_clock_s). dop carries the dilution-of-precision scalars for any full-rank geometry; a single-system solve uses the bit-exact four-state cofactor, a multi-system solve a general inverse with one clock column per constellation, and is nil only when the geometry is rank-deficient. system_tdops is a map of GNSS letter to that system's time DOP (the square root of its clock cofactor variance), one entry per constellation in the solve; the reference system's value equals dop.tdop, and the map is empty when the geometry is rank-deficient. rx_clock_drift_s_s is populated by solve_with_doppler/5 and is nil for pseudorange-only solves. position_covariance carries the unit-variance ECEF and local ENU position covariance blocks in square metres. residuals_m are the post-fit pseudorange residuals in meters, in used_sats order. pseudorange_variances_m2 and effective weights are aligned to the same satellites; the former are the estimator's code variances in square metres, while the latter are inverse variances and include final Huber factors when robust reweighting is enabled. used_sats are the contributing satellite id strings (e.g. "G01"); rejected_sats pairs each excluded satellite id with its reason. Strict SSR size refusals retain {:ssr_correction_exceeds_limit, %{orbit_m: value, clock_m: value}}. (the ionosphere correction was requested and the satellite has no resolvable carrier, such as a GLONASS satellite with no channel or a channel outside -7..6). A satellite is reported with the first reason that applies, tested in that order. metadata reports solver iterations, convergence, the corrections applied, and the geometry redundancy: used_count, the distinct systems, the redundancy (degrees of freedom, used_count - (3 + systems)), raim_checkable? (redundancy >= 1), and geometry_quality with the core observability tier, rank, condition number, GDOP, RAIM checkability, and covariance-validation flag. An exactly determined fix has redundancy < 1, forcing the residuals near zero and leaving the fix unverifiable by RAIM. When the opt-in :huber reweighting runs, metadata also carries :huber with the outer_iterations count and the final_scale_m (the last MAD robust scale in meters); the key is absent on the default static path.