A weak target detection method, a microwave radar sensor and an unmanned aerial vehicle

Abstract

A weak target detection method, a microwave radar sensor and an unmanned aerial vehicle are provided by embodiments of the invention. The method can be applied for a rotatable microwave radar sensor,and includes sending a plurality of frequency-modulated continuous wave signals in a rotation process of the rotatable microwave radar sensor; receiving a plurality of echo signals reflected by a weaktarget; accumulating a plurality of echo signals in the beam width of the microwave radar sensor to obtain accumulated echo signals; and determining the position information of the weak target according to the accumulated echo signals. The method, the sensor and the unmanned aerial vehicle can achieve an improved signal to noise ratio of the echo signals, thus improving weak target detection capability of the microwave radar sensor and enhancing operation safety of the unmanned aerial vehicle equipped with the microwave radar sensor.

Description

technical field [0001] Embodiments of the present invention relate to the field of unmanned aerial vehicles, in particular to a weak target detection method, a microwave radar sensor and an unmanned aerial vehicle. Background technique [0002] Microwave radar sensor is a kind of information such as the distance, speed, angle and other information of the target in the effective space range detected by emitting electromagnetic waves. Pulse radar and continuous wave radar are two types of radar used in high precision radar ranging. Among them, the continuous wave radar can specifically be a frequency modulated continuous wave (Frequency Modulated Continuous Wave, FMCW) radar. The basic principle of using FMCW radar to achieve high-precision radar ranging is that the transmitted wave is a high-frequency continuous wave, and its frequency changes with time according to the law of triangular waves. , by measuring the frequency of the intermediate frequency signal obtained by tra...

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Problems solved by technology

[0004] However, when UAVs are flying, especially when agricultural UAVs are operating, they often face work scenarios such as small wires, high-voltage lines, and cable-stayed lines in the field. The above-mentioned FMCW radar sensor cannot effectively detect the weak target at a long distance, and the detection distance is too short to give the UAV enough reaction time, which in turn cannot provide a favorable guarantee for the safe flight of the UAV

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