System for obtaining a velocity of a moving object from a speed

Details System for obtaining a velocity of a moving object from a speed System for obtaining a velocity of a moving object from a speed

1995-06-28

1997-11-11

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342104, 342461, G01S 502

Patent

active

056869258

ABSTRACT:
A speed conversion coefficient calculating section 104 calculates a ratio of a GPS Doppler velocity calculated by a GPS velocity calculating section 101 to a vehicle speed measured by a speed sensor 102, thereby obtaining a speed conversion coefficient. There are provided a plurality of filtering sections 105-108 for averaging momently produced speed conversion coefficients. A filter selecting section 109 selects an optimum filtering section among these filtering sections 105-108. If a ratio of the speed conversion coefficient resultant from the speed conversion coefficient calculating section 104 to a presently adopted speed conversion coefficient is not within a predetermined range, an abnormality detecting & initializing section 110 notifies abnormality and initializes calculation process of the speed conversion coefficient in response to detection of such an abnormality.

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patent: 5546311 (1996-08-01), Sekine

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