Accord's Next Generation High Performance GPS/WAAS Receiver Based on the Soft-Correlator

Vimala Chikkabbaiah, Nagaraj Chanarayapatna Shivaramaiah, Hemanth M. Srikantaiah, Venkatesh M. Subramanyam, M. R. Shenoy

Abstract:	NAV2500TM is the next generation GPS/WAAS receiver from Accord. Based on the enhanced Soft-CorrelatorTM, the receiver is designed around a single high performance fixed point general purpose Digital Signal Processor (DSP) from Analog Devices and a standard Radio Frequency down converter. The receiver features increased availability of the GPS solution by means of improved speed of signal acquisition and reacquisition along with enhanced signal tracking sensitivity. The 12 channel GPS/WAAS correlator and the navigation module are both realized using a single DSP to offer the performance demanded by a whole new generation of hand held, wireless computing, automotive and timing applications. The receiver can be configured to track SBAS signals. This generation of receivers feature better TTFF performance and much lower power consumption characteristics over the NAV2300 from Accord. NAV2500TM employs a configurable in-built soft- demodulator to decode MSK DGPS signals from Beacons. The receiver can also be used as an accurate timing reference, which can be utilized in a variety of synchronization applications. The software Numerically Controlled Oscillator (NCO) in the receiver which is synchronized with the GPS epoch can be programmed to generate frequencies ranging from 100Hz to 10MHz. The timing unit of the receiver is driven by an inexpensive crystal.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	329 - 336
Cite this article:	Chikkabbaiah, Vimala, Shivaramaiah, Nagaraj Chanarayapatna, Srikantaiah, Hemanth M., Subramanyam, Venkatesh M., Shenoy, M. R., "Accord's Next Generation High Performance GPS/WAAS Receiver Based on the Soft-Correlator," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 329-336.
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