GPS signal fault isolation monitor
AssigneeHoneywell Inc.
InventorMats A. Brenner
Life of this patent
Estimating the term…
Abstract
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.
Claims15
A system for use in a vehicle receiving signals from an inertial reference unit and a GPS receiver, receiving signals from a plurality of satellites, comprising:
- an acceleration monitor operable to utilize the signals from the inertial reference unit to produce a first signal indicative of the acceleration of the vehicle along a first axis and operable to utilize the signals from the GPS receiver to produce a second signal indicative of the acceleration of the vehicle along the first axis said acceleration monitor comparing the first and second signals and producing a third signal when the difference between the first and second signals is greater than a predetermined threshold.
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.
Dependencies are inferred from the claim text.