Passive radar direction-finding method and system based on single receiver compound scanning

The invention discloses a passive radar direction-finding method and system based on single receiver compound scanning. The method includes: acquiring the echo signal of a receiver, wherein the receiver uses a compound rotation mode including elliptical motion spiral motion, and the long semi-axis and the short semi-axis of the spiral motion are gradually increased; according to the motion trajectory function of the receiver, determining a slant range of an object to be tested relative to the receiver; determining a discrete echo signal according to the slant range; decomposing the discrete echo signal to obtain a first decomposed echo signal and a second decomposed echo signal; determining a first direction-finding preprocessing vector according to the echo signal and the first decomposedecho signal; determining a second direction-finding preprocessing vector according to the echo signal and the second decomposed echo signal; determining the direction of the object to be tested according to the first directi