低信噪比下相干信号DOA估计算法研究
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摘要
为了解决低信噪比下相干信号波达方向(DOA)估计精度和分辨率不高的问题,提出了低信噪比下相干信号DOA估计算法,此方法主要利用了空间平滑算法和ES-MUSIC算法的优点。相干信号源进行解相干通过空间平滑技术实现,接着,再使用ES-MUSIC算法进行DOA估计。分别对DOA估计成功概率、DOA估计均方误差、DOA估计成功分辨概率进行了对比测试,测试结果表明,与传统的方法相比,该方法在低信噪比下DOA估计精度和分辨率更高。
In order to solve the problem of low coherent signal DOA estimation accuracy and low resolution in low signal to noise ratio, this paper proposes a DOA estimation algorithm for coherent signal under low SNR. This method mainly uses the advantages of spatial smoothing algorithm and ES-MUSIC algorithm. Coherent signals are decohered through spatial smoothing, and then ES-MUSIC algorithm is used to estimate DOA. In this paper, the DOA estimation success probability, DOA estimation mean square er-ror and DOA estimation successful resolution are compared. The test results show that compared with the traditional method, the proposed method has higher DOA estimation accuracy and resolution at low signal to noise ratio.
In order to solve the problem of low coherent signal DOA estimation accuracy and low resolution in low signal to noise ratio, this paper proposes a DOA estimation algorithm for coherent signal under low SNR. This method mainly uses the advantages of spatial smoothing algorithm and ES-MUSIC algorithm. Coherent signals are decohered through spatial smoothing, and then ES-MUSIC algorithm is used to estimate DOA. In this paper, the DOA estimation success probability, DOA estimation mean square er-ror and DOA estimation successful resolution are compared. The test results show that compared with the traditional method, the proposed method has higher DOA estimation accuracy and resolution at low signal to noise ratio.
引文
[1]吴国庆,陈善继.基于解相干的MUSIC算法估计性能分析[J].现代电子技术,2011,34(7):94-96.
[2]王布宏,王永良,陈辉.相干信源波达方向估计的加权空间平滑算法[J].通信学报,2003,24(4):31-40.
[3]陈栋,杨保海,丁文斌.冲激噪声下相干信源的求根MUSIC算法[J].现代电子技术,2017,40(5):1-4.
[4]INGHELBRECHTV,VERHAEVERTJ,HECKETV,et al.The influence of random element displacement on DOA estimates obtained with(Khatri-Rao-)Root-MUSIC[J].Sensors,2014,14(11):21258-21280.
[5]李磊,李国林,刘润杰.基于相干积累矩阵重构的波达方向估计新方法[J].雷达学报,2015,4(2):178-185.
[6]余昌和,李建黎.低信噪比下相干信号的DOA估计的白噪声滤除方法[J].信号处理,2012,28(7):957-962.
[7]Chen Guobin,Luo Nanying.Network actual traffic prediction algorithm based onα-stable distribution and wavelet transformation[J].Cybernetics and Information Technologies,2014,14(4):45-55.
[8]Sun Baofa.MUSIC based on uniform circular array and its direction finding efficiency[J].International Journal of Signal Processing Systems,2013,1(2):273-277.
[9]周小军,谭薇,冯大政,等.基于解相干的改进MUSIC算法DOA估计[J].无线电工程,2014,44(11):18-21.
[10]杨雪亚,陈伯孝,朱根生.基于实值特征子空间迭代的DOA估计算法[J].西安电子科技大学学报,2010,37(2):242-247.
[2]王布宏,王永良,陈辉.相干信源波达方向估计的加权空间平滑算法[J].通信学报,2003,24(4):31-40.
[3]陈栋,杨保海,丁文斌.冲激噪声下相干信源的求根MUSIC算法[J].现代电子技术,2017,40(5):1-4.
[4]INGHELBRECHTV,VERHAEVERTJ,HECKETV,et al.The influence of random element displacement on DOA estimates obtained with(Khatri-Rao-)Root-MUSIC[J].Sensors,2014,14(11):21258-21280.
[5]李磊,李国林,刘润杰.基于相干积累矩阵重构的波达方向估计新方法[J].雷达学报,2015,4(2):178-185.
[6]余昌和,李建黎.低信噪比下相干信号的DOA估计的白噪声滤除方法[J].信号处理,2012,28(7):957-962.
[7]Chen Guobin,Luo Nanying.Network actual traffic prediction algorithm based onα-stable distribution and wavelet transformation[J].Cybernetics and Information Technologies,2014,14(4):45-55.
[8]Sun Baofa.MUSIC based on uniform circular array and its direction finding efficiency[J].International Journal of Signal Processing Systems,2013,1(2):273-277.
[9]周小军,谭薇,冯大政,等.基于解相干的改进MUSIC算法DOA估计[J].无线电工程,2014,44(11):18-21.
[10]杨雪亚,陈伯孝,朱根生.基于实值特征子空间迭代的DOA估计算法[J].西安电子科技大学学报,2010,37(2):242-247.