Passive location parametric estimation based on DS signal GPS

In electronic countermeasure system,passive location tracking system has the best hidden characteristic for eradiating no electromagnetic field itself.And to get the location information parameters from eradiating electromagnetic signal is the premise and the key for realizing passive location.This paper computes delays and Doppler shift between the echo signal and the original one by making use of GPS satellite system signal,and simulates one kind of estimation method.All are the foundation of objective location.