Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1998-01-30
1999-09-14
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235702, G01S 502
Patent
active
059529610
ABSTRACT:
The present invention comprises a low-observable radar altimeter augmented GPS (global positioning system) aircraft navigation system. The system of the present invention includes a GPS receiver, an attitude sensor, and a low-observable radar altimeter. The GPS receiver receives GPS signals and determines a position therefrom. The attitude sensor is coupled to the GPS receiver. The attitude sensor is adapted to receive GPS signals and determine a three dimensional attitude of the aircraft therefrom. The low-observable radar altimeter is also coupled to the GPS receiver and is coupled to the attitude sensor. The radar altimeter is adapted to measure an AGL (above ground level) altitude of the aircraft. The radar altimeter measures the altitude by employing a low-observable radar transmitter slaved to the attitude sensor. The radar altimeter uses the attitude sensor to maintain a radar beam in a substantially vertical attitude (e.g., parallel to the local gravity vector). The system of the present invention uses the AGL altitude to increase the accuracy of the position.
REFERENCES:
patent: 5202695 (1993-04-01), Hollandsworth et al.
patent: 5451963 (1995-09-01), Lempicke
patent: 5506588 (1996-04-01), Diefes et al.
patent: 5548293 (1996-08-01), Cohen
patent: 5820080 (1998-10-01), Eschenbach
Hellner Mark
Trimble Navigation Limited
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