Module orbit_determination 

SP3-anchored numerical orbit determination and residual ledgers.

The fit estimates one inertial Cartesian initial state per satellite from a batch of precise ephemeris samples. Input positions follow the SP3 convention: ITRS/ECEF meters at scale-tagged epochs. They are transformed to GCRS kilometers with the shared frame pipeline before the numerical propagator is evaluated. Reported residuals are projected into the propagated state’s RTN frame and accumulated per satellite and per constellation.

Structs

OrbitArcSpan

Arc span covered by a residual ledger.

OrbitFitOptions

Options controlling a precise-orbit fit.

OrbitFitReport

Batch orbit-fit report for one or more satellites.

OrbitFitSolution

Initial-state fit result for one satellite.

OrbitResidualLedger

Residual RMS ledger, grouped by satellite and constellation.

OrbitResidualStats

RTN residual RMS summary.

OrientedPreciseEphemerisStateSample

One ECEF SP3 state sample paired with the Earth orientation for that epoch.

Enums

OrbitFitCovariance

State-covariance result for a fitted initial state.

OrbitFitError

Error returned by precise-orbit fitting.

Functions

fit_all_sp3_precise_orbits

Fit every satellite declared in a parsed SP3 product.

fit_precise_ephemeris_sample_orbit

Fit one satellite from precise ephemeris samples.

fit_precise_ephemeris_sample_orbit_with_initial_state

Fit one satellite from precise ephemeris samples with a caller-supplied arc-start initial-state seed.

fit_precise_ephemeris_sample_orbits

Fit selected satellites from precise ephemeris samples.

fit_precise_ephemeris_state_sample_orbit

Fit one satellite from ECEF state samples paired with Earth orientation.

fit_precise_ephemeris_state_sample_orbits

Fit selected satellites from ECEF state samples paired with Earth orientation.

fit_sp3_precise_orbit

Fit one satellite from a parsed SP3 product.

fit_sp3_precise_orbit_with_initial_state

Fit one satellite from a parsed SP3 product with a caller-supplied arc-start initial-state seed.

fit_sp3_precise_orbits

Fit selected satellites from a parsed SP3 product.