Intercomparison of GEOS-A observation systems

The current status of NASA's Geodetic Satellite Observation Systems A number of accurate short Intercomparison Investigation is presented.orbital arcs (1/4 orbit) were determined with tracking data from the GEOS-A satellite tracking systems.NASA Goddard Range and Range Rate (GRARR), Laser and MOTS camera systems, the Army Sequential Collation of Range (SECOR) system, the Navy Tranet doppler system and the Air Force PC-1000 camera.Types of systems included were the Error model coefficients derived for the various systems include zero-set bias, timing bias, and refraction anomaly.These are determined to an accuracy better than the 10 meter goal of the investigation.Random noise estimates for these data were also determined.The Short Orbital arc technique of intercomparison is shown to give results consistent with intercomparisons of data from collocated Laser and GRARR systems at Rosman, North Carolina.