Onboard positioning system

Details Onboard positioning system Onboard positioning system

1995-06-06

1997-08-12

Louis-Jacques, Jacques

Boots, shoes, and leggings

3644497, 3644498, 364459, 364460, 340995, 340988, 342357, 342457, 342358, 342451, G06G 778

Patent

active

056572328

ABSTRACT:
A relative speed of a vehicle with respect to a satellite is detected from a deviation of a tuning frequency caused by the Doppler effect, and a vehicle speed is determined from the relative speed. A piezoelectric oscillation gyro detects an angular speed of rotation of the vehicle, which is integrated to determine an azimuth. A travel is detected in terms of the vehicle speed and the azimuth, and the detected travel and information from available GPS satellites are substituted into a navigation equation to solve it for a solution. Alternatively, altitude information detected by an altitude sensor and the angular speed of rotation of the vehicle as detected by the piezoelectric oscillation gyro may be is inputted. The angular speed of rotation is integrated to determine the azimuth. Information from two GPS satellites and information representing azimuth .phi. and altitude .DELTA.z are substituted into the navigation equation to solve it for a solution. Kalman filter is employed. Even when available GPS satellites is two or one, the determination of the position of the vehicle is enabled. The need for a vehicle speed sensor is eliminated, and the accuracy of positioning is enhanced.

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