Method and apparatus for adaptively processing GPS signals in a GPS receiver

DETAILED DESCRIPTION A method and apparatus for adaptively processing Global Positioning System (GPS) signals in a GPS receiver is disclosed.
In one embodiment of the present invention, the adaptive method of processing GPS signals optimizes the initial acquisition of GPS signals by performing the search using three separate parameters.
These parameters include satellite number, Doppler information, and integration time.
In one embodiment of the present invention, GPS signals are received for a first satellite of a plurality of in-view GPS satellites.
The first satellite is selected based on its position relative to the other in-view satellites, such that the strongest signals are first processed.
The signals are stored in a digital snapshot memory and processed using fast convolution methods over a first integration time period and for each of a set of hypothesized Doppler frequencies.
If the output from the initial acquisition operation is insufficient to produce a proper pseudorange calculation, one or more of the parameters is altered, and a new acquisition operation is performed.
Other features of the present invention will be apparent from the accompanying drawings and from the detailed description which follows.