Hitachi HGA-II Fiber Optic Gyroscope for Vehicular Applications

Bob Yoshida and Vincent Martinelli

Abstract:	The HGA-D fiber-optic gyroscope is the most recent product introduction in Hitachi Cable Ltd.‘s line of gyroscopes for land vehicular applications. The HGA-D functions as a complement to the GPS receiver in navigation and location systems. The HGA-D provides dead reckoning information required for route guidance and improves the overall system performance, especially in environments where the GPS receiver may be shielded from satellite signals. With the HGA-D design, Hitachi has reduced the size and the manufacturing cost compared to previous product generations. These improvements have been achieved without compromising the high performance and reliability of previous FOG designs. Thousands of Hitachi Cable FOGS are currently being used in automotive navigation systems in Japan. where they have operated failure-free for the past three years, as well as in a variety of systems in the US and Europe. In this paper, we will briefly describe the FOG operating principle, basic design and benefits before focusing on specific performance attributes of the HGA-D. In particular, we will discuss how the HGA-D is incorporated into vehicular systems that use GPS. We will describe how the FOG has been designed to be highly reliable in vehicular environments. We will also provide an overview of future directions for FOG product improvement.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	143 - 146
Cite this article:	Yoshida, Bob, Martinelli, Vincent, "Hitachi HGA-II Fiber Optic Gyroscope for Vehicular Applications," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 143-146.
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