The characteristics of multipath interference signals from GPS are presented. The influence of the multipath interference on receiver’s pseudo-range measurement accuracy and delay locked loop is analyzed. The relationship between measurement accuracy of receiver, multipath delay, correlation space and receiver’s signal bandwidth is presented and a multipath mitigation technique relative to a pulse aperture correlator on the basis of sequence correlator is provided. The experiment and simulation on Narrow Correlator and a pulse aperture correlator technique based on sequence correlator are presented.