@type t() :: %Sidereon.CCSDS.TDM.Observable{
  kind:
    :range
    | :doppler_instantaneous
    | :doppler_integrated
    | :receive_freq
    | :transmit_freq
    | :transmit_freq_rate
    | :angle_1
    | :angle_2
    | :other,
  name: String.t() | nil,
  participant: non_neg_integer() | nil
}