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<title>AAS 98-197</title><body BGCOLOR="ffffff"> <h2>AAS 98-197</h2> <h2>PRECISE ORBIT DETERMINATION FOR THE MOMS/PRIRODA CAMERA EXPERIMENT BASED ON DGPS CARRIER-PHASE AND PSEUDO-RANGE MEASUREMENTS</h2> <h4>D. C. Kuijper - German Space Operations Center (GSOC), Germany</h4> <h2> Abstract </h2> This paper deals with the precise orbit determination of the German Modular Optoelectronic Multispectral Scanner (MOMS), mounted on the PRIRODA module of MIR, based on differential GPS carrier-phase and pseudo-range measurements. The collected GPS measurements have been combined with ground station data to double difference GPS observables. The problem of ionospheric effects and cycle ambiguities for a single frequency receiver is addressed. Several orbit determination strategies are discussed and orbit determination results are presented. The orbit accuracy is assessed by analysis of the data residuals, formal errors, internal orbit overlaps, and comparisons with external sources. <P><A HREF="http://www.space-flight.org/AAS_meetings/1998_winter/sessions.html">Back</A>