【摘要】 线性调频连续波(LFMCW)检测运动目标存在一定难度,利用二维FFT处理技术对目标回波信号相位信息进行提取,可有效抑制固定杂波,实现对运动目标的检测。介绍了线性调频连续波(LFMCW)雷达信号进行多普勒处理的原理以及利用单片FPGA实现多普勒测速雷达信号处理的过程,详细说明了数据的缓存、实数序列FFT的快速算法以及希尔伯特变换等步骤的FPGA实现,最后测试结果表明二维FFT算法能很好的提取出目标的距离和速度。更多还原

【Abstract】 There is a certain degree of difficulty to detect moving targets by linear frequency modulated continuous wave( LFMCW),two-dimensional FFT target echo signal processing techniques to extract phase information,which can effectively suppress the fixed clutter,achieve the detection of moving targets. The implementation of signal processing for Doppler velocity radar with a FPGA chip and LFMCW Doppler radar signal processing principles are introduced. The data buffer,fast algorithm for the FFT sequence of real numbers,Hilbert transform,etc of the FPGA are described. Finally,the test results show that the two-dimensional FFT algorithm can extract the distance and speed of the target.更多还原