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本文将毫米波线性调频连续波(Linear frequency modulated continuous wave,LFMCW)雷达用于水面探测,并介绍了水面探测实验及其成像算法。在成像处理中,采用传统的成像算法很难获取水面纹理。为解决该问题,本文提出了一种针对水面纹理的毫米波LFMCW雷达水面成像算法。相对于传统成像算法,本文算法做了以下两点改进:首先,采用频域滤波法去除静止目标回波的干扰;其次,采用最大似然估计算法估计方位频谱参数,计算水面回波能量,减小乘性噪声干扰。成像结果表明,该算法能够获取水面纹理,且优于传统成像算法。
In this paper, a linear frequency modulated continuous wave (LFMCW) radar is used to detect water surface, and the water surface detection experiment and its imaging algorithm are introduced. In image processing, surface texture is difficult to obtain using traditional imaging algorithms. In order to solve this problem, this paper presents a water surface texture-based millimeter-wave LFMCW radar surface imaging algorithm. Compared with the traditional imaging algorithms, the proposed algorithm improves on the following two points: Firstly, the interference of the stationary target echo is removed by using the frequency-domain filtering method; secondly, the maximum likelihood estimation algorithm is used to estimate the azimuth spectral parameters and the water surface echo energy is subtracted Minority noise interference. The imaging results show that the algorithm can obtain the water surface texture and is superior to the traditional imaging algorithms.