77G UAV (Unmanned Aerial Vehicle) obstacle avoidance radar

Abstract

The invention provides a 77G UAV (Unmanned Aerial Vehicle) obstacle avoidance radar. A radar antenna array, an ADC sampling module, a DSP, a main chip and a communication interface module are designedon a PCB; after electromagnetic waves emitted by the radar antenna array encounter an obstacle and are reflected, the reflected electromagnetic waves are received by the radar antenna array; the ADCsampling module collects data; the data enter the DSP for data processing which involves using distance dimension FFT, velocity dimension FFT, constant false alarm detection CFAR, DOA azimuth estimation, a tracking algorithm to obtain the distance, speed, azimuth of the obstacle and a position where the obstacle appears next time; the relevant information is transmitted to the ARM main chip for decision making processing; finally, required information is transmitted according to needs; and therefore, an obstacle nearest to an unmanned aerial vehicle is detected in a complex environment, and the information of the same obstacle is measured in real time.

Description

technical field [0001] The invention belongs to the technical field of obstacle avoidance for unmanned aerial vehicles, in particular to radar obstacle avoidance, in particular to a 77G unmanned aerial vehicle obstacle avoidance radar. Background technique [0002] The UAV automatic obstacle avoidance system can avoid obstacles in the flight path in time, greatly reducing various losses caused by operational errors. The radar work is not affected by the ambient light, and it can work normally at night. Because of the advantages of the working principle, the radar obstacle avoidance has higher adaptability and safety than the general visual obstacle avoidance. [0003] At present, the key technology of 77G millimeter-wave radar is monopolized by foreign companies, and the localization is almost in a blank state. The existing domestic UAV radar is mainly 24G radar. Because the bandwidth of 24G frequency radar is too small, its distance and speed resolution are not good. High,...

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Problems solved by technology

[0003] At present, the key technology of 77G millimeter-wave radar is monopolized by foreign companies, and the localization is almost in a blank state. The existing domestic UAV radar is mainly 24G radar. Because the bandwidth of 24G frequency radar is too small, its distance and speed resolution are not good. High, resulting in this frequency radar can not recognize long-distance small-diameter objects, and can not achieve good results in avoiding obstacles. The bandwidth of 24G radar can only be 0.5-1GHz; the bandwidth b of 77G UAV obstacle avoidance radar is 4GHz

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