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Method of and apparatus for detecting vehicle speed pulse drop, on-vehicle navigation system, program storage device and computer data signal embodied in carrier wave

  • US 6,836,729 B2
  • Filed: 05/03/2002
  • Issued: 12/28/2004
  • Est. Priority Date: 05/07/2001
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a vehicle speed pulse drop of a vehicle speed pulse in an on-vehicle navigation system, said system comprising a radio wave positioning apparatus and a vehicle speed sensor, by which the vehicle speed pulse is generated, for a dead reckoning positioning, said method comprising:

  • a first calculation process of calculating a first physical quantity of a predetermined type from radio wave positioning data of the radio wave positioning apparatus;

    a second calculation process of calculating a second physical quantity of the predetermined type from the vehicle speed pulse; and

    a detection process of detecting the vehicle speed pulse drop by using a contradiction caused between the calculated first physical quantity and the calculated second physical quantity as a detection condition.

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