Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1992-11-27
1993-11-30
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342419, H04B 7185, G01S 502
Patent
active
052669580
ABSTRACT:
A GPS receiver (10) with processor (14, 16), memory (18), input (20) and indicator (22), uses conventional code pseudorange and carrier phase to provide a compass function. The receiver antenna (12) is desirably held stationary while the directional vectors toward the satellites and for the desired heading (21) are computed, the rate of change of carrier phase determined and future carrier phase predicted. The antenna (12) is then moved in a closed path (11) while the differences between predicted and actual carrier phase are measured and converted to positional perturbations which are resolved along the desired heading (21) and normal thereto. As the antenna (12) moves around the closed path (11), the resolved perturbations have maxima, minima or change sign and the processor (14, 16) uses this to trigger the indicator (22, 222) so that the desired heading is apparent to the user.
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Blum Theodore M.
Fliegel Frederick M.
Handy Robert M.
Motorola Inc.
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