Multi-target arrival time difference positioning method based on height-dimension segmented searching

Abstract

The invention discloses a multi-target arrival time difference positioning method based on height-dimension segmented searching. On the basis of the geometric characteristic of being far less than a distance between a target and a ground-based radar observation station by a height dimension difference between the target and the ground-based radar observation station, segmented searching is carried out by using the height dimension of the target as known one within an effective height range; positioning is carried out by using observation station detection values in paired traverse combination and two-dimensional plane coordinate values of all possible targets are calculated; and detection data having same coordinate values are classified into one target set and target association is carried out. Because the probability of occurrence of real target signal data in detection values of all radar receiving observation stations is larger than a false alarm value, when one detection value occurs in several possible target sets, only the target set with the most set elements is kept and thus possible false target association is rejected. The method is applied to an arrival time difference positioning system to improve the positioning performance of a time difference of arrival (TDOA) on the multi-target condition.

Description

technical field [0001] The invention belongs to signal and information processing, and specifically relates to TDOA (Time Difference of Arrival, Time Difference of Arrival) multi-target positioning technology. Background technique [0002] In a passive radar system, it does not emit electromagnetic wave signals itself, but realizes the detection and tracking of targets by passively receiving electromagnetic wave signals radiated by targets or reflecting electromagnetic signals from non-cooperative external radiation sources. An effective method of electronic jamming and countering radiation weapon attacks. [0003] In the multi-station passive time difference positioning system, the radar signal is sent through the external radiation source, and then based on the target observation data of multiple receiving radar stations (the time difference of arrival of the receiving station) and the position coordinates of the receiving radar station and the external radiation source, e...

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Problems solved by technology

[0045] The purpose of the present invention is to: in order to improve the positioning accuracy of the existing time difference positioning system and solve the technical problem of difficult time difference correlation matching in multi-target TDOA positioning, a multi-target time difference of arrival positioning method based on height dimension segment search is disclosed

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