Multiple-output-single-input-based passive radar positioning tracking system and positioning tracking method

Abstract

The invention discloses a multiple-output-single-input-based passive radar positioning tracking system and a multiple-output-single-input-based passive radar positioning tracking method, which mainly aims to solve the problem of low target positioning tracking accuracy of a passive radar under the conditions of external radiation source distribution non-uniformity and relatively greater distance measurement errors. The system consists of a reference antenna, a signal antenna, a receiver, a signal processor, a constant false alarm detection and flight path processing module and a positioning tracking module, wherein the signal antenna adopts a horizontally polarized antenna, and receives echoes and a multipath signal from a target; the received signal is filtered and amplified by the receiver; AD conversion, digital down-conversion, clutter cancellation and a range-doppler two-dimensional correlation operation are performed on an analogue signal by the signal processor, and the target on an original flight path or a new flight path is detected from an operation result; and finally multi-station information pairing, target positioning tracking and display are performed. By the system and the method, the target can be accurately positioned and tracked under the conditions of external radiation source distribution non-uniformity and relatively greater distance measurement errors.

Description

technical field [0001] The invention belongs to the field of radar technology, and relates to radar positioning. Specifically, it is an external radiation source radar positioning system and method based on the "multiple transmission and single reception" system. Under the environment, realize the precise positioning and tracking of the target. technical background [0002] With the development of modern warfare technology, radar is facing threats from target stealth, anti-radiation missiles, low-altitude penetration and electronic jamming. How to make the radar system complete the detection, positioning and tracking of enemy targets in the background of strong interference, and at the same time avoid the killing of the enemy's anti-radiation weapons, is the key to effectively protect oneself and strike the enemy. Passive radar system has attracted extensive attention because of its characteristics of undetectability, simple structure and low cost. The passive radar system...

AI Technical Summary

Problems solved by technology

However, due to the uncontrollable, unpredictable and non-cooperative characteristics of external radiation sources, the detection performance of external radiation source radars is often worse than that of conventional radar systems, so more complex signal processing methods are needed to improve the detection and tracking performance of the entire system

[0004] At present, the radar systems based on external radiation sources researched at home and abroad mainly include the following two types: one is based on a single radiation source for positioning and tracking, which uses two antennas to receive the direct wave of the radiation source and the echo signal of the target respectively, and then Carry out cancellation, matching and detection. This method not only has a small detection range, but also has low positioning accuracy; the other is to fuse the target measurement information of multiple transmitting stations, that is, the multi-transmission and single-reception mode, which can use different transmissions at the receiving end. The echo information of the station can effectively suppress the target RCS flicker, so as to complete the target detection more effectively and improve the positioning accuracy. However, when the illumination source distribution is irregular and the distance measurement accuracy is low, this method will lead to the rapid deterioration of the positioning accuracy and make it difficult to meet the actual situation. application

Images