Low-altitude defense radar system and method based on digital beamforming technology

Abstract

A low-altitude defense radar system based on digital beamforming technology, including: a radar host, a servo turntable and a control module, wherein the radar host includes: an active antenna module for transmitting broadband FM continuous wave signals and echo signals simultaneously receiving; and a digital module, which is used to control the parameters of the transmitted signal, the digital attenuation of the received signal, and the scanning angle range and rotational speed of the servo turntable, and perform DBF weighted processing on the received echo signal to obtain a multi-channel and difference beam signal, and use The multi-channel sum-difference beam signal is combined with the scanning angle information at the time of signal acquisition for real-time processing to obtain the detection result. The sum-difference beam signal is a single pulse signal of sum-azimuth difference-pitch difference. The system can realize real-time monitoring of "low, slow and small" targets in a large area at the same time, and can measure the distance, angle, speed, etc. of the target with high precision, greatly improving the airspace coverage of the radar.

Description

technical field [0001] The disclosure belongs to the field of radar technology, and relates to a low-altitude defense radar system and method based on digital beamforming technology. Background technique [0002] "Low, slow and small" targets mainly include various types of unmanned aerial vehicles, aviation models, hot air balloons and other aircraft, with low-altitude flight (below 1000m), slow speed (less than 200km / h), miniaturization (radar cross-sectional area less than 2m) 2 )Characteristics. This kind of target is low in cost, easy to carry and easy to operate, which makes them low in take-off requirements and strong in take-off, making it difficult to find and deal with illegal flight operations, which is very easy to endanger national air defense security, social public safety, and personal and property safety. threatening. At present, every year, there are incidents of major safety problems caused by the illegal flight of drones and other "low, slow and small" t...

AI Technical Summary

Problems solved by technology

Photoelectric detection is susceptible to interference from ambient light. The infrared characteristics of the target are not obvious when the cloud layer is thick or cloudy, and the contrast between the target and the background is low when the light is backlit. The noise ratio is low, which further increases the difficulty of photoelectric detection

Acoustic detection is greatly affected by the sound clutter in the environment, and the sound amplitude of "low, slow and small" aircraft is small, so the range of acoustic detection is not large

Radio signal detection adopts passive detection technology, affected by the position of radio emission signal, the detection accuracy of airspace in different positions will be quite different

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