Interval passive positioning method and system based on TDOA

The invention discloses an interval passive positioning method based on time difference of arrival (TDOA), and the method comprises the steps: carrying out the interval processing of two TDOA measurement values generated between three observation stations in an observation station group and a radiation source, and obtaining two TDOA measurement intervals; uniformly dividing the position interval of the prior radiation source into a plurality of parts to form a plurality of cutting lines; selecting a reference observation station to solve a TDOA equation for the cutting lines, and finding discrete intersection points of each TDOA measurement interval on each cutting line; drawing a circumscribed rectangle according to discrete intersection points on each cutting line, wherein the circumscribed rectangle is a time difference line interval approximation area; carrying out overlapping operation on bounding rectangles measured in all TDOA intervals, and constructing bounding rectangles for intersection areas; and