I found the link at the bottom of the page: http://en.wikipedia.org/wiki/Simplified_perturbations_models.
The direct link to the source code is: http://www.centerforspace.com/downloads/files/sgp4/AIAA-2006-6753Code.zip
I compiled the source code, fed it test TLEs and it outputted ephemeris vectors.
The SGP4 implementation was written by David Vallado in 2007. It has implementations for the SGP4 prediction model and the SDP4 prediction model. The SGP4 (Simplified General Perturbation Model No4) apply to near Earth orbits with a orbital period of less than 225 minutes. The SDP4 (Simplified Deep Space Perturbations Model No4) apply to orbits with orbital periods greater than 225 minutes.Share on Twitter Share on Facebook