摘要
DOA估计是阵列信号处理中的热点。文中针对LFM信号的DOA估计算法采样数据量大,在低信噪比情况下估计效果不理想的问题,提出了基于子空间匹配追踪的LFM信号的DOA估计。该方法通过子空间匹配追踪算法将信号投影在子空间上,求出最大投影,最终估计出LFM信号的DOA。此外,改进后的空间匹配追踪算法,还解决了原算法收敛速度慢、会出现过匹配现象的问题。经仿真验证对比,该算法估计DOA的过程中匹配次数远小于匹配追踪的过程中,且在较低的信噪比下能估计出DOA。
A DOA estimation of LFM signal based on subspace matching pursuit is purposed to deal with the large sampled data in the estimation of LFM signal and unsatisfactory estimation under low signal noise ratio. The subspace matching pursuit arithmetic projects the signal on the subspace, calculates the maximum projection, and finally estimates the DOA of the LFM signal. This arithmetic also improves matching pursuit arithmetic and decreases the over matching phenomenon. Simulations show that the number of over matching by the subspace matching pursuit arithmetic is much less than that by the matching pursuit arithmetic, and the DOA are estimated under low signal noise ratio.
出处
《电子科技》
2014年第7期43-46,共4页
Electronic Science and Technology
基金
国家自然科学基金资助项目(61172071)
关键词
线性调频信号
DOA估计
压缩感知
匹配追踪算法
liner frequency modulated signal
estimation of DOA
compressed sensing
matching pursuit arithmetic
