×

Navigation system with apparatus for detecting accuracy failures

  • US 8,019,539 B2
  • Filed: 04/14/2008
  • Issued: 09/13/2011
  • Est. Priority Date: 12/07/2007
  • Status: Active Grant
First Claim
Patent Images

1. A navigation system for a vehicle having a receiver operable to receive a plurality of signals from a plurality of transmitters, the navigation system comprising:

  • a processor; and

    a memory device having stored thereon machine-readable instructions that, when executed by the processor, enable the processor to;

    determine a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals,determine an error covariance matrix for a main navigation solution based on the determined set of error estimates, the error covariance matrix including off-diagonal elements representing ionospheric-delay spatial correlation, andusing a parity space technique, determine at least one protection level value based on the error covariance matrix.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×