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Zero motion detection system for improved vehicle navigation system

  • US 5,991,692 A
  • Filed: 12/28/1995
  • Issued: 11/23/1999
  • Est. Priority Date: 12/28/1995
  • Status: Expired due to Term
First Claim
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1. A vehicle navigation system having an improved zero motion detection system comprising:

  • a motion detection sensor which provides motion signals with an offset;

    said zero motion detection system compares at least one sample of said motion signals with a threshold to determine a zero motion state, said zero motion detection system determining said zero motion state if said at least one sample is less than said threshold, and if in said zero motion state, said detection system determines said offset;

    said navigation system propagates a previous position to a current position based upon a non-zero velocity signal when said zero motion state is not determined, said navigation system ignoring said non-zero velocity signal and locking a previously determined position based upon said determination of said zero motion state.

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