Design and Simulation of Threshold and Dwell Time for GPS Parallel Acquisition

Based on the research on the statistical property of decision variables,this paper analyzes theoretically the influences of threshold and dwell time on the false-alarm probability and the detection probability under constant false-alarm rate(CFAR) criteria.A method to design the threshold and dwell time is proposed in which the threshold is expressed in the relationship of the false-alarm probability,the cells searched in one pass and the non-coherent integrations,and the dwell time is related to the false-alarm probability,the detection probability,the cells searched in one pass and the carrier-to-noise ratio.Simulation results demonstrate that the proposed method is correct.