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SGL-UT / GPSTk

ATTENTION: This repository has been moved and is for archival purposes only. GPSTk toolkit has been renamed to GNSSTK and has been split into two new separate repositories. GNSSTK now only contains libraries while the other repository GNSSTK-APPS contains only applications. The rename and split into libraries and applications started with version v12.0.0 on September 2021. GPSTk --> GNSSTK at https://gitlab.com/sgl-ut/gnsstk --> GNSSTK-APPS at https://gitlab.com/sgl-ut/gnsstk-apps
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Precision of orbit prediction with SatOrbitPropagator #25

Open eborovenskiy opened 7 years ago

eborovenskiy commented 7 years ago

Hello everyone!

Could you help me please. I use the GPStk for the prediction of satellite orbit. I use class SatOrbitPropagator. I have exact ephemeris for the Radarsat-1 satellite. I try to propagate ephemeris and i have big difference with exact coordinates. I see that coordinate mistakes increase very fast. For example: on 8 minutes i have difference 900 meters by X coordinate on 16 minutes i have difference 2100 meters by X coordinate ... on 112 minute i have difference 22200 meters by X coordinate.

I use standard integrator RKF78. I try to use different variation of orbit models(atmosphere, gravity, Solar radiation pressure, etc), but i have a same resulats(difference with using different models constitute some meters).

What precision of SatOrbitPropagator? Can i use SatOrbitPropagator for 112 minutes?

kfkuang commented 7 years ago

In fact, the satellite orbit prediction part in GPSTk is not complete, there are some bugs to be fixed.