Differential phase measurement through antenna multiplexing

Details Differential phase measurement through antenna multiplexing Differential phase measurement through antenna multiplexing

1992-10-06

1993-12-07

Hellner, Mark

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

Directive

Including a satellite

342442, 342433, G01S 502

Patent

active

052686957

ABSTRACT:
An embodiment of the present invention is a system for time multiplexing a carrier signal received by two or more GPS antennas through a single hardware path, using a single receiver's oscillator in that hardware path as a reference to compare the phase from each antenna. One of the antennas is designated as a reference antenna and a carrier signal received by it is used to phase lock in numerically controlled oscillator. The same carrier signal received by the other antennas is periodically compared in phase to the output of the numerically controlled oscillator. Each comparison results in a phase angle measurement for the respective antennas compared to the master antenna.

REFERENCES:
patent: 4384293 (1983-05-01), Deem et al.
patent: 4468793 (1984-08-01), Johnson et al.
patent: 4485383 (1984-11-01), Maher
patent: 4807216 (1989-02-01), Holmes et al.
patent: 5021792 (1991-06-01), Hwang
patent: 5101356 (1992-03-01), Timothy et al.
Johnsen, et al., "Applications of a Multiplexed GPS User Set," IEEE, pp. 61-77.

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