Unmanned aerial vehicle SAR imaging method and apparatus

Abstract

The invention provides an unmanned aerial vehicle SAR imaging method and apparatus for an unmanned aerial vehicle SAR imaging system. The unmanned aerial vehicle SAR imaging system comprises a pre-processing end and a fine processing end. The method comprises the steps of receiving a SAR echo signal, and judging whether extraction of an azimuth pulse signal of the SAR echo signal is needed or not;extracting the azimuth pulse signal of the echo signal to generate a first pulse signal; filtering the first pulse signal or the SAR echo signal, and extracting the filtered signal to generate a second pulse signal; conducting distance FFT on the second pulse signal to generate a distance compression signal; accumulating a plurality of distance compression signals, and conducting azimuth FFT on the azimuth directions of the multiple distance compression signals to generate a preprocessing signal; sending the pre-processing signal to the fine processing end, so that the fine processing end conducts imaging processing on the preprocessing signal to generate a SAR image. By means of two-step processing of the pre-processing end and the fine processing end, the located weight and power consumption of the unmanned aerial vehicle are reduced, and the image quality is also improved.

Description

technical field [0001] The invention relates to the technical field of SAR imaging, in particular to a method and device for SAR imaging of an unmanned aerial vehicle. Background technique [0002] UAV SAR can detect and image important areas around the clock, especially the UAV SAR system with real-time imaging capability can realize low-latency and uninterrupted real-time imaging of the target area, realizing effective dynamic monitoring. In recent years, researchers have invested a lot of research on SAR real-time imaging processing methods. With the rapid development of digital signal processing technology, real-time radar imaging processing systems based on DSP (Digital Signal Processing, DSP) or FPGA (Field Programmable GateArray, FPGA) chips have also been widely studied. It can realize range compression, range migration correction, Doppler modulation frequency estimation, motion error compensation, azimuth compression, grayscale quantization and other processing of ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a UAV SAR imaging method and device, which at least solve the problems of weight, volume and power consumption of the imaging system carried by the UAV SAR system, as well as poor imaging quality and low resolution.

Images