Method for rapid signal acquisition in a satellite communication

Details Method for rapid signal acquisition in a satellite communication Method for rapid signal acquisition in a satellite communication

1994-07-11

1997-09-09

Issing, Gregory C.

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

Directive

Including a satellite

455 121, G01S 502, H04B 7185

Patent

active

056661223

ABSTRACT:
The signal acquisition process of the present invention enables a radio to rapidly acquire a pilot signal from a satellite after the radio has been out of contact with the satellite for a length of time. The radio first acquires a satellite pilot signal and determines its position in relation to the earth. If the radio is now shut off or loses track of the pilot signal for some other reason, the radio keeps track of the length of time that it has been out of contact with the satellite. This length of time enables the radio to estimate the extent of possible position changes and, therefore, which satellites might be in view and their relative positions to the radio. This allows the radio to make assumptions about variables such as the Doppler shift of the signal that reduces the uncertainty inherent in the acquisition process and the size of the window that must be searched.

REFERENCES:
patent: 5119504 (1992-06-01), Durboraw, III
patent: 5365450 (1994-11-01), Schuchman et al.
patent: 5420593 (1995-05-01), Niles

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