초록 ▼

A system to determine, from inertial reference apparatus and from GPS receiver apparatus, acceleration signals along a predetermined axis to determine the failure of a GPS satellite signal by comparison of the acceleration signals and to monitor newly acquired GPS satellite signals to determine if a

A system to determine, from inertial reference apparatus and from GPS receiver apparatus, acceleration signals along a predetermined axis to determine the failure of a GPS satellite signal by comparison of the acceleration signals and to monitor newly acquired GPS satellite signals to determine if a satellite drift was present prior to acquisition.

대표청구항 ▼

[ I claim:] [14.] In a system which includes an inertial reference unit and a receiver which receives GPS signals from a plurality of satellites, the method of providing an indication that a GPS signal failure has occurred comprising the steps of:A. determining from the inertial reference unit the a

[ I claim:] [14.] In a system which includes an inertial reference unit and a receiver which receives GPS signals from a plurality of satellites, the method of providing an indication that a GPS signal failure has occurred comprising the steps of:A. determining from the inertial reference unit the acceleration of the vehicle along a first axis;B. determining from the GPS signals the acceleration of the vehicle along the first axis;C. comparing the acceleration as determined from step A with the acceleration as determined from step B; and, D. producing a first output whenever the comparison in step C is greater than a predetermined amount.