Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-06-30
1997-02-04
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
36442406, 340979, A01S 502, H04B 7185, G01C 2100, G06F 770
Patent
active
056003293
ABSTRACT:
In the present invention, a plurality of DGPS receivers are employed to determine receiver-satellite-specific differential correction values. In turn, satellite-specific differential correction values are determined as an average of the individual receiver-satellite-specific differential correction values for each of the tracked satellites. A discriminator is employed for determining a receiver-satellite-specific discriminant which may be sampled and subsequent determination of a receiver-satellite-specific statistical value thereof. The receiver-satellite-specific statistical values may then be employed for determination of a Detection Threshold value and other integrity information associated with each of the satellite-specific differential correction values. The ground station further includes a means for communicating the satellite-specific differential correction values and integrity information associated therewith to a DGPS airborne receiver.
An DGPS airborne system in accordance with the present invention is configured to include a mechanization for receiving the satellite-specific differential correction values and integrity information associated therewith. An airborne integrity monitoring system may then be employed to derive particular integrity limit values associated with the DGPS derived position for pilot awareness as to whether or not the pilot should rely upon the DGPS solution for a precision landing.
REFERENCES:
patent: 4894655 (1990-01-01), Joguet et al.
Kovach et al, "The ARINC Veracious Differential Reference Station Concept and Status", pp. 143-152, Conference Proceedings, National Telesystems Conference, 1993.
Vallot et al, "Design and Flight Test of a Differential GPS/Inertial Navigation System For Approach/Landing Guidance" Navigation, Jrn. of Inst. of Nav., vol. 38, #2, Summer 1991.
Honeywell Inc.
Issing Gregory C.
Pajak Robert A.
Ungemach Charles J.
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