中文摘要：

针对近程LFMCW测距雷达中频信号规则区较短导致的中频信号频率估计精度不高的问题,在分析自相关信号特点基础之上,提出基于多段自相关信号及MC算法的频率估计算法。首先,利用自相关函数得到多段自相关信号;然后,通过对多段自相关信号进行时域平均,获得平均自相关信号;最后,利用频率估计的MC算法计算平均自相关信号的频率,得到频率估计值。计算验证和实测实验表明,在信噪比为-10-15 d B时所提算法频率估计精度高于MC算法及其现有改进算法,改善了LFMCW雷达的测距精度。

英文摘要：

Aiming at the problem that short-range LFMCW ranging radar with short IF signal leads to low frequency estimation precision,a frequency estimation algorithm based on multi-segment autocorrelation signal and MC method was proposed. First,the autocorrelation function was used to obtain the multi-autocorrelation signals. Then,the average autocorrelation signal was obtained by calculating the time domain average of the multi-segment autocorrelation signals. Finally,the estimated frequency was gained through MC algorithm. Calculation verification and experimental results show that the proposed algorithm performs better in frequency estimation compared with MC algorithm and its current modified algorithms,which contributes to improve the LFMCW ranging precision.