Distributed passive radar system and target positioning method

Abstract

The invention discloses a distributed passive radar system and a target positioning method thereof, and relates to the technical field of radar detection for aerial target monitoring, wherein the system comprises a central station and a receiving station. The target positioning method of the system comprises the following steps: (1) a direct signal of the digital broadcast television station is received by the receiving station; (2) the direct signal is demodulated by the receiving station, and then modulating and reconstructing of the reconstructed reference signal are carried out; (3) the receiving station uses a reference signal to complete target detection and time difference extraction signal processing work, and the processing result is reported to a center station; (4) the central station uses a plurality of time differences of the same target obtained by the plurality of receiving stations, and the positioning of the target is completed; (5) the center station completes the tracking of the air target to form a target track. A plurality of receiving stations are adopted for distributed work, and the coverage of the low-altitude airspace is good. The low-altitude target detection effect is good in complex terrains and urban areas; no electromagnetic signals are radiated during working of the receiving station, and pollution and harm to the environment and personnel are avoided, and the large-scale deployment and the use cost of the receiving station and the active radar are low.

Description

technical field [0001] The invention relates to the technical field of radar detection for air target monitoring, in particular to a distributed passive radar system and a target positioning method thereof. Background technique [0002] With the development of the general aviation industry and the civilian drone industry, the detection and monitoring of low-altitude airspace aircraft such as general aviation aircraft and consumer drones is becoming more and more important. Aircraft in low-altitude airspace have low flying altitude, slow speed, and small radar reflection area, referred to as low-slow and small targets. Low, slow, and small targets fly at low altitudes, are greatly affected by the curvature of the earth and terrain, and are easily blocked; the speed is slow and the reflection area is small, and their echo signals are mixed with strong ground clutter signals, which increases the difficulty of radar detection . [0003] At present, the detection and monitoring...

AI Technical Summary

Problems solved by technology

Low, slow, and small targets fly at low altitudes, are greatly affected by the curvature of the earth and terrain, and are easily blocked; the speed is slow and the reflection area is small, and their echo signals are mixed with strong ground clutter signals, which increases the difficulty of radar detection

[0003] At present, the detection and monitoring of low, slow and small targets is a problem that is difficult to deal with with existing radars

Affected by the curvature of the earth, topography and various high-rise buildings, conventional active radars have a relatively short detection distance for low-altitude airspace aircraft. In order to seamlessly monitor low-altitude aircraft in urban areas, it is necessary to deploy multiple radars to meet the requirements.

Conventional active radar will radiate high-power microwave signals when it is working, which will inevitably cause strong interference to surrounding electronic equipment. Long-term high-power microwave radiation will also have a greater impact on the health of surrounding personnel; conventional active radar is expensive , the cost of deployment and maintenance will be high

These factors greatly limit the large-scale application of conventional radar in the surveillance of low-altitude airspace aircraft

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