System for using differential GPS receivers with autopilot syste

Details System for using differential GPS receivers with autopilot syste System for using differential GPS receivers with autopilot syste

1997-09-17

1999-08-31

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342 33, 701215, G01S 502

Patent

active

059459433

ABSTRACT:
A precision approach capable dual differential global positioning system (DGPS) receiver avionics system. The system of the present invention includes a first and a second DGPS receiver. The first and second DGPS receivers are both adapted to interface with an autopilot in an aircraft. The DGPS receivers each determine the position of the aircraft as the aircraft proceeds along a flight path. Both DGPS receivers are further adapted to employ carrier aiding to smooth the code phase measurements used in determining the position of the aircraft. Within a predetermined range along the approach path of the aircraft and when the output of the first DGPS receiver and the output of the second DGPS receiver are proximate within a predetermined distance, the DGPS receivers determine a transition point. After the transition point, the DGPS receivers utilize DGPS carrier phase tracking to determine the position of the aircraft relative to its position at the transition point. The low noise characteristics of the carrier phase tracking allows the DGPS receivers to properly interface with the autopilot of the aircraft.

REFERENCES:
patent: 5361212 (1994-11-01), Class et al.
patent: 5702070 (1997-12-01), Waid
patent: 5786773 (1998-07-01), Murphy

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