System and method for the acquisition of a non-geosynchronous sa

Details System and method for the acquisition of a non-geosynchronous sa System and method for the acquisition of a non-geosynchronous sa

1997-10-14

1999-07-27

Tarcza, Thomas

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

Directive

Including a steerable array

342359, 342427, H01Q 300

Patent

active

059298081

ABSTRACT:
An antenna having multiple antenna elements that are selectively activated performs an initial acquisition of a satellite signal by activating only a few of the antenna elements. This results in a broad beam width and increases the likelihood of detecting the signal from the satellite. When the satellite signal is initially detected, the system increases the number of active elements to narrow the beam width. The system incrementally increases the number of active antenna elements until the detected signal from the satellite exceeds a predetermined threshold. At that point, the location of the satellite may be precisely determined and all antenna elements activated to lock onto the satellite signal. If the antenna loses acquisition of the satellite signal, the reverse process may be implemented whereby some elements are selectively deactivated to broaden the beam width of the antenna in an effort to reacquire the satellite signal. When the satellite signal is reacquired, the antenna elements are incrementally reactivated until all antenna elements are active.

REFERENCES:
patent: 3713163 (1973-01-01), Keller et al.
patent: 4257048 (1981-03-01), Yokoi et al.
patent: 5025262 (1991-06-01), Abdelrazik et al.
patent: 5140333 (1992-08-01), Parker
patent: 5525990 (1996-06-01), Lewis
patent: 5543811 (1996-08-01), Chethik
patent: 5559806 (1996-09-01), Kurby et al.

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