GPS Receiver Technologies

Javad Ashjaee

Abstract: This paper reports on the results of developing a multiple channel, C/A code GPS receiver for geodetic applications. The digital signal processing technique provides carrier phase of better than 0.2 millimeter rms. Carrier phase measurements are full cycle (rather than half cycle). Time tagging of better than 0.02 microsecond (equivalent to 0.07 millimeter) is achieved using crystal oscillators (no need for atomic clocks). Time synchronization is done continuously via C/A code (no need for manual time calibration). Cycle slips are detected by the receiver and recorded. Integrated Doppler measurements (independent of carrier phase) are provided to give both whole and fraction of carrier phase and be used for data validation and ensure data integrity. Accurate Doppler measurements are provided for concatenating cycle slips. Error in interchannel biases is less than 0.2 millimeter. Error due to antenna phase center is about 2 millimeters. To reduce the effect of multipath the antenna must be blocked with RF absorbing material for elevation angles less than 10 degrees. Signal acquisition and data logging is fully automatic. Post processing requires no operator decision. Data processing can be performed real time, if data link exists. Data analysis utilities are provided.
Published in: Proceedings of the 42nd Annual Meeting of The Institute of Navigation (1986)
June 24 - 26, 1986
Seattle, Washington
Pages: 99 - 105
Cite this article: Ashjaee, Javad, "GPS Receiver Technologies," Proceedings of the 42nd Annual Meeting of The Institute of Navigation (1986), Seattle, Washington, June 1986, pp. 99-105.
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