|High-sensitivity GPS (HSGPS) receivers permit GPS signal measurements to be acquired and tracked in certain indoor environments where this previously was not possible. However, solution reliability and accuracy are significantly degraded because of the nonavailability of some satellites, multipath errors, measurement noise associated with the low power of the remaining signals, and echo-only and cross-correlation signal tracking. The focus of this paper is on improving static-mode HSGPS positioning performance in terms of accuracy and reliability. Thus, various techniques, such as height fixing, simulation-based noise modeling, reliability testing in terms of fault detection and exclusion (FDE), and batch processing, are implemented. An XTrac-LPTM HSGPS evaluation kit, developed by SiRF Technologies Inc., is used to investigate some indoor environments by analyzing the fading and pseudorange error conditions. In addition, the measurements provided by the receiver are used to test the performance of the algorithms intended to improve the HSGPS positioning capability.
|NAVIGATION: Journal of the Institute of Navigation, Volume 51, Number 1
|29 - 44
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