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LFMCW雷达距离分辨力的分析及改善
Analysis and improvement of LFMCW radar’s range resolution
【摘要】 为了提高线性调频连续波(linear frequency modulation continuous wave,LFMCW)雷达的距离分辨力,一方面提出了一种"八段交叉"开环校正法对调频线性度进行校正,另一方面根据基于FFT的LFMCW雷达实际距离分辨力与带宽和频率分辨率的关系,选择2GHz大带宽和4 096点FFT运算,并且计算频率时避开差频信号的不规则区域,截取规则区域内的数据进行运算。仿真和测试实验都表明经过上述处理后的雷达距离分辨力得到一定的改善。
【Abstract】 In order to improve the range resolution of Linear Frequency Modulation Continuous Wave(LFMCW) radar,across-eight section open-loop method is proposed to correct the FM linearity.According to the relationship among LFMCW radar ’ s actual range resolution,bandwidth and frequency resolution,a 2GHz large bandwidth and 4096-point FFT operation are selected.The irregular region of beat signal is avoided when computing the frequency and the sampling data is intercepted from the regular region.Simulation and experiments show that the above treatments have brought some improvement to the radar ’ s range resolution.
【Key words】 LFMCW; range resolution; open-loop correction method; frequency resolution;
- 【文献出处】 重庆大学学报 ,Journal of Chongqing University , 编辑部邮箱 ,2012年08期
- 【分类号】TN953
- 【被引频次】4
- 【下载频次】282