Combined time difference passive locating method

Abstract

The invention discloses a passive locating method combining reaching time difference of radiation waves and scanning time difference of radiation waves and belongs to the field of radiation source passive locating (also called passive locating). The method comprises the steps of measuring the reaching time difference of radiation waves, directly reaching various receiving stations, of even-speed scanning radiation sources, and the scanning time difference of main main lobe beams scanning the various receiving stations; calculating the distance difference that the radiator sources reaching various radiation sources, and target included angles of radiator sources scanning various receiving stations; finally calculating according to a locating geometrical triangle, and solving distances from the radiation source to various receiving stations. Thus, the target location is obtained. Compared with other locating methods, the passive locating method can effectively improve locating precision, can accurately locate long-distance targets, and is simple in implement of technology. Moreover, the station distribution mode conforms to the requirements of actual application.

Description

1. Technical field [0001] The invention relates to the field of radiation source passive positioning (also known as passive positioning) using a synchronous clock. 2. Background technology [0002] Passive positioning of radiation sources has a wide range of applications in military affairs. In order to make the positioning results real-time, an array scheme of double (multiple) receiving stations is generally adopted. There are three basic methods for passive real-time positioning: one is the traditional direction-finding intersection method, the other is the time difference of arrival method, and the third is the Doppler frequency difference method. Among them, the first positioning method requires two receiving stations, and the latter two require three receiving stations. The combination or deformation of the three basic methods can derive a variety of real-time passive positioning methods. [0003] Dual receiving stations are paid more attention because of fewer obser...

AI Technical Summary

Problems solved by technology

In recent years, studies have shown that there are mainly four available dual-station positioning methods: one is the traditional classic dual-station direction-finding intersection method, which is simple and easy to implement, but the positioning accuracy is low, especially when the radiation source is far away, that is, the target angle is relatively large. The second is the time difference / direction finding joint positioning method, which has higher positioning accuracy than the direction finding cross method, but the positioning accuracy for long-distance radiation sources is still very low; the third is the time difference / frequency difference joint positioning method, which has higher positioning accuracy. However, the requirements for time and frequency measurement accuracy are very high, which are tens of nanoseconds and hertz level respectively, and the technology is complex, which is suitable for radiation sources with relative motion; the fourth is the Chinese national defense patent "98109928. The Radar Reconnaissance and Positioning Method” (registered in 2006), is suitable for common uniform scanning radiation sources (such as radar, sonar, etc.), the technology is simple to implement, and has high positioning accuracy at long distances. However, due to the use of direction finding / In the scanning time difference system, the positioning accuracy depends on the direction-finding accuracy of the receiving equipment, which is difficult to achieve high

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