A deeply integrated GPS/low-cost IMU system is developed and applied to re-acquire and track GPS signals with low carrier-to-noise ratio (CNR). The system provides continuous carrier phase tracking without requiring the knowledge of navigation data bits. Flight data with a 90-degree turn are applied to demonstrate re-acquisition and continuous carrier phase tracking of 15 dB-Hz GPS signals.
A transform-domain, instrumentation-quality GPS receiver is presented for high-fidelity signal quality monitoring, satellite anomalous event monitoring, and basic GPS research. Receiver design details are provided that enable unique applications such as real time transform-domain processing, 55 points per C/A code chip Signal Quality Monitoring (SQM) capability, 10-correlator P(Y) code SQM, 50-Hz trajectory reconstruction at the millimeter-per-update level, 10-Hz L2 trajectory reconstruction at the centimeter-per-update level (semi-codeless), and GPS/INS deep-integration code and carrier tracking for interference robustness and indoor navigation.
A new method for decoding navigation data bits from very weak Global Positioning System (GPS) signals is presented.
Coherent signal integration is applied over a time period that includes multiple navigation data bits. A search is performed fora combination of bits that maximizes the signal energy during the coherent integration.
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