Vehicle-mounted satellite signal receiving apparatus

Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation

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H01Q 300

Patent

active

058283374

ABSTRACT:
In a vehicle mounted satellite signal receiving apparatus which adopts a satellite tracking system combining a gyro tracking with a hybrid tracking, there is provided a device which can revise an offset error correction value of a gyro sensor, even if there is a drift in the offset error. In this device, gyro tracking is performed when a reception level is a threshold value L.sub.C or more. The gyro tracking is performed by setting an antenna at an angular velocity .omega., which is derived from an equation,.omega.=-.omega.G+.DELTA..omega.G, where -.omega.G is a value resulted from conversion of sign for gyro angular velocity .omega.G, and .DELTA..omega.G is a prescribed offset error correction value. A reception level declines if the offset error correction value .DELTA..omega.G deviates and therefore an apparent offset error arises in the gyro sensor. When the reception level declines below a threshold value L.sub.B, the aforementioned offset error correction value .DELTA..omega.G is revised, basing on the direction of an angular velocity .omega.S which is used in the hybrid tracking (or step tracking).

REFERENCES:
patent: 5227806 (1993-07-01), Eguchi
patent: 5347286 (1994-09-01), Babitch
patent: 5594460 (1997-01-01), Eguchi

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