Abstract: Using navigation message data bit transition detection, a method for increasing GPS signal processing gain is studied.Several continuous data segments are matched by using digital signal processing technique, and coarse bit transition position can be achieved from the matched results.Therefore, more data bit coherent integration results (except for the results affected by data bit transition) can be accumulated to achieve a relative high processing gain.The result shows that the processing gain will be enhanced of 1.45~5.23dB when using the same data length as traditional method.