Fine Tuning GPS Clock Estimation in the MCS
SPACE OPERATIONS SQUADRON ( 2ND) SCHRIEVER AFB CO
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With the completion of a 24 operational satellite constellation, GPS is fast approaching the critical milestone, Full Operational Capability FOC. Although GPS is well capable of providing the timing accuracy and stability figures required by system specifications, the GPS community will continue to strive for further improvements in performance. The GPS Master Control Station MCS recently demonstrated that timing improvements are always possible, provided we dont sacrifice system integrity in the process. The most recent improvements have concentrated on a re-evaluation of the MCS Kalman Filters Continuous Time Update Process Noises, also known as qs. Rubidium Rb qs received notable and well needed attention in early 1994. In late 1994, the MCS completely re-messed the qs for all individual GPS frequency standards By tuning MCS clock estimation on a satellite-by-satellite basis, weve safely optimized the utility of the GPS Composite Clock, and hence, Kalman Filter state estimation, providing a small improvement to user accuracy.
- Test Facilities, Equipment and Methods