Autonomous High Sensitivity and High Positioning Accuracy GPS Receiver

Mutsuo Hada, Masanobu Shoji, Yoshihiko Uchida, Kazutada Sorita, Yasunori Aiga, Nobuhiro Tsuda, Mikio Nakamura, Koichi Washizu and Toshiyuki Okamura

Abstract:	Our ASIC development for GPS receivers is focused on high sensitivity and high positioning accuracy. The FFT-based frequency domain processing and time domain processing are known to obtain the high sensitivity performance. Our development has realized this performance by using the time domain processing. Our development features: 1. We realize the higher sensitivity by improving the signal tracking and acquisition algorithm. We realize the higher positioning accuracy by developing the multipath correction algorithm. This algorithm discriminates direct signals, multipath and reflected signals, and corrects them. This algorithm reduces positioning errors in low signal level areas, especially in urban areas. And we developed the multipath mitigation technology to reduce the pseudo range errors in the tracking signal. 2. The downsized GPS receiver is realized by both incorporating peripheral circuits and downsizing the circuits in the ASIC. 3. The developed ASIC incorporates the speed pulse counter to enable dead reckoning. This paper describes a newly-developed baseband ASIC architecture, a GPS receiver using this ASIC, and the method of enhancing the sensitivity and positioning accuracy of the receiver.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1507 - 1514
Cite this article:	Hada, Mutsuo, Shoji, Masanobu, Uchida, Yoshihiko, Sorita, Kazutada, Aiga, Yasunori, Tsuda, Nobuhiro, Nakamura, Mikio, Washizu, Koichi, Okamura, Toshiyuki, "Autonomous High Sensitivity and High Positioning Accuracy GPS Receiver," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1507-1514.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In