Julia and the GPS payload onboard Waratah Seed-1 satellite

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This feature will be very easy to implement! I will do this!

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Hi @minetest2048 !

Can you please test the main branch of SatelliteToolboxPropagators.jl? Now, you can do this:

julia> using SatelliteToolboxPropagators

julia> f = create_tle_fetcher(CelestrakTleFetcher)
CelestrakTleFetcher("https://celestrak.org/NORAD/elements/gp.php")

julia> tles = fetch_tles(f; satellite_name = "ISS (ZARYA)")
[ Info: Fetch TLEs from Celestrak using satellite name: "ISS (ZARYA)" ...
1-element Vector{TLE}:
 TLE: ISS (ZARYA) (Epoch = 2024-12-27T11:52:08.200)

julia> iss_tle = tles[1]
TLE:
                      Name : ISS (ZARYA)
          Satellite number : 25544
  International designator : 98067A
        Epoch (Year / Day) : 24 / 362.49453935 (2024-12-27T11:52:08.200)
        Element set number : 999
              Eccentricity :   0.00057970
               Inclination :  51.63830000 deg
                      RAAN :  77.61300000 deg
       Argument of perigee :  11.65550000 deg
              Mean anomaly : 348.45670000 deg
           Mean motion (n) :  15.50310083 revs / day
         Revolution number : 48853
                        B* :   0.00045083 1 / er
                     ṅ / 2 :   0.00025652 rev / day²
                     n̈ / 6 :            0 rev / day³

julia> orbp = Propagators.init(Val(:SGP4), iss_tle)
OrbitPropagatorSgp4{Float64, Float64}:
   Propagator name : SGP4 Orbit Propagator
  Propagator epoch : 2024-12-27T11:52:08.200
  Last propagation : 2024-12-27T11:52:08.200

julia> sv_teme = Propagators.propagate!(orbp, 0, OrbitStateVector)
OrbitStateVector{Float64, Float64}:
  epoch : 2.46067e6 (2024-12-27T11:52:08.200)
      r : [1456.71, 6632.76, 0.0224472]  km
      v : [-4.647, 1.0129, 6.01325]      km/s

The last argument in Propagators.propagate! is now a “sink” option and it can be Tuple (default) to obtain the old behavior or OrbitStateVector to obtain the state vector as you wanted.

I only need to add the documentation and test cases before tagging the new version.