A null-steering device and method for a stationary or low-speed unmanned aerial vehicle

Abstract

This invention discloses an amplitude comparison direction finding device and method for stationary or low-speed unmanned aerial vehicles (UAVs). The device includes a directional antenna ANT, a data acquisition module M1, and a processing and control module M2. The directional antenna ANT is a single-element antenna and is connected to the input terminal RX of the data acquisition module M1 via an RF cable. The control input terminal and data output terminal of the data acquisition module M1 are respectively connected to the output terminal SPI and the input terminal IQ of the processing and control module M2. This invention employs a power statistics module to statistically analyze the power of the captured N frames of signals according to their frequency distribution, and uses the power and frequency with the highest probability of occurrence as the power and frequency values ​​of the UAV image transmission signal. The design concept is based on the different characteristics of UAV image transmission signals in the bandwidth and time domain compared to command and control signals and occasional interference. This method can effectively suppress the impact of UAV image transmission signal and occasional background noise interference on the measurement of UAV image transmission signal power, thereby improving the effectiveness of direction finding.

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