Passive radar signal locating method based on synthetic-aperture antenna array

The invention discloses a passive radar signal locating method based on a synthetic-aperture antenna array. For meeting the urgent requirements of achieving precise localization of radar targets to be located through small aircrafts, virtualization of the same receiver in different flying positions at different times is viewed as a synthetic-aperture antenna array element to provide precise estimation of the signal virtualization arrival time differences of the radar targets to be located. The method is implemented through the steps of (1) performing system initialization; (2) sampling and receiving the signals of a radar to be located in a discrete mode through two aircrafts; (3) enabling the two aircrafts to determine the virtualization arrival time differences respectively; (4) determining the position of the radar to be located. The passive radar signal locating method based on the synthetic aperture antenna array can achieve radar target localization with the small aircrafts and has relatively high and stable locating performance and relatively high practical values.