Low-altitude unmanned aerial vehicle passive detection positioning system

Abstract

The invention discloses a low-altitude unmanned aerial vehicle passive detection positioning system. The system comprises more than one detection branch; each detection branch comprises an array antenna assembly, a multi-channel receiving assembly and a detection positioning assembly, which are connected in sequence; the array antenna assembly comprises a plurality of antenna array elements used for receiving radio frequency signals transmitted by an unmanned aerial vehicle; the multi-channel receiving assembly synchronously receives signals received by each antenna array element; detection positioning of an unmanned aerial vehicle target is realized through the detection positioning assembly; the array antenna assembly comprises more than one low-frequency antenna unit, more than one medium-frequency antenna unit and more than one high-frequency antenna unit; the medium-frequency antenna units and the high-frequency antenna units are integrated on the same circuit board to form medium-high-frequency antenna units; and the low-frequency antenna units and the medium-high-frequency antenna units are separately arranged at specified angles at intervals. The system has the advantages of being simple in structure, low in cost, small in loss, free of space environment influence, high in detection efficiency and precision and the like.

Description

technical field [0001] The invention relates to the technical field of passive detection of low-altitude unmanned aerial vehicles, in particular to a passive detection and positioning system for low-altitude unmanned aerial vehicles. Background technique [0002] At present, drones are used more and more widely, and have become professional equipment and living tools in various industries, which can greatly save working time and improve work efficiency. But in some key areas, such as airports, prisons, government departments, etc., drones have brought security risks to these sensitive areas. Therefore, it is urgent to complete the functions of UAV detection, suppression, and interception through anti-UAV passive detection, so as to realize the security protection of important areas. [0003] In low-altitude protection, drones fly at a relatively low altitude, small in size and slow in speed, and are called typical "low, small and slow" targets. For the detection of low-alt...

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Problems solved by technology

However, this type of method requires a separate design of a complex radio frequency switch circuit, and the antenna signal needs to pass through a radio frequency switch to the receiver, resulting in a large link loss. The UAV transmission signal is sent periodically, and each time the receiver receives a signal from one antenna, the UAV communication signal received by each antenna is not the data at the same time when it enters the receiver, and it is difficult to accurately detect the drone from the detection signals at different times. Man-machine position, low detection efficiency, large detection azimuth error

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