Multi-station passive positioning method based on time difference of arrival of signals

The invention discloses a multi-station passive positioning method based on time difference of arrival of signals. The method comprises the following steps: S1, receiving a target radiation source signal each receiving station receives a target radiation source signal; S2, calculating the time difference of arrival of the signals: the time difference of arrival of the signals between every two receiving stations is calculated; S3, calculating the estimated position of the target radiation source: the estimated position of the target radiation source is obtained by adopting a weighted least square method twice; S4, setting a search area: the estimated position of the target radiation source is taken as a center, and a search area is set around the estimated position; S5, searching a target function extreme value: minimum value point searching of the target function is carried out in the searching area; and S6, determining the position of the target radiation source: the coordinate corresponding to the minimum