satellitetoolbox-base

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SatelliteToolboxBase.jl providing foundational types, constants, and orbit representations for the JuliaSpace ecosystem. Use when working with KeplerianElements, OrbitStateVector, anomaly conversions, Julian Date utilities, or SatelliteToolbox constants.

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SatelliteToolboxBase.jl

Foundation package for the JuliaSpace SatelliteToolbox ecosystem. Repo: JuliaSpace/SatelliteToolboxBase.jl

CRITICAL: Unit Convention

SatelliteToolbox uses meters and m/s throughout. HAMMERHEAD libraries use km and km/s. Always convert at interop boundaries (* 1e3 or / 1e3).

Key Types

KeplerianElements{Tepoch, T}  # t [JD], a [m], e, i [rad], Ω [rad], ω [rad], f [rad]
OrbitStateVector{Tepoch, T}   # t [JD], r::SVector{3,T} [m], v::SVector{3,T} [m/s]
Ellipsoid{T}                  # a (semi-major), f (flattening) -> auto-computes b, e², el²

Constants

Constant	Value	Unit
`GM_EARTH`	3.986004415e14	m³/s²
`EARTH_EQUATORIAL_RADIUS`	6378137.0	m
`EARTH_ANGULAR_SPEED`	7.292115e-5	rad/s
`ASTRONOMICAL_UNIT`	1.496e11	m
`SUN_RADIUS`	6.96342e8	m
`JD_J2000`	2451545.0	Julian Day
`WGS84_ELLIPSOID`	Ellipsoid{Float64}	WGS-84

Orbit Conversions

kepler_to_rv(orb)          # -> (r::SVector{3}, v::SVector{3}) in meters, m/s
kepler_to_sv(orb)          # -> OrbitStateVector
rv_to_kepler(t, r, v)      # -> KeplerianElements
sv_to_kepler(sv)           # -> KeplerianElements

Anomaly Conversions (all radians, returns [0, 2π])

mean_to_eccentric_anomaly(e, M; max_iterations=10, tol=nothing)
mean_to_true_anomaly(e, M)
eccentric_to_true_anomaly(e, E)
true_to_eccentric_anomaly(e, f)
true_to_mean_anomaly(e, f)

Time Utilities

date_to_jd(year, month, day, hour, min, sec)  # -> Julian Day
jd_to_date(JD)                                 # -> (year, month, day, hour, min, sec)
jd_to_gmst(JD)                                 # -> GMST [rad]