基于解相干MUSIC的相干信源直接定位法研究
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摘要
针对MUSIC(Multiple Signal Classification)直接定位法(Direct Position Determination)对相干信源直接定位能力下降甚至失效的问题,提出了解相干MUSIC(Improved MUSIC)直接定位算法。在对信源协方差矩阵共轭重构后,采用空间谱搜索方法,实现对相干信源的直接定位。基于解相干MUSIC直接定位法继承了解相干MUSIC算法对相干信源DOA(Di-rection Of Arrival)估计更准确的优点,能够在保证对非相干信源定位精度的同时,减小对相干信源定位的误差。仿真对比结果表明,该算法可用于对相干信源的直接定位,且在信源距离较近、低信噪比、小快拍情况下具有比经典MUSIC更好的分辨力。
The improved MUSIC algorithm is proposed to solve the problem that the ability to decline or even lose for coherent signal of MUSIC direct position determination. After the reconstruction of the source covariance conjugate,the direct position determination of the coherent source is realized by means of the space spectrum search. The direct position determination based on improved MUSIC algorithm inherits and improved MUSIC algorithm's advantage of more accurate estimation of coherent source DOA,which can reduce the error of coherent source location while ensuring the accuracy of non-coherent source location. Simulation results show that this method applies to direct position determination for coherent signal. And it performs better than classic MUSIC even under nearer the distance of signals,low-SNR or low-snap situation.
The improved MUSIC algorithm is proposed to solve the problem that the ability to decline or even lose for coherent signal of MUSIC direct position determination. After the reconstruction of the source covariance conjugate,the direct position determination of the coherent source is realized by means of the space spectrum search. The direct position determination based on improved MUSIC algorithm inherits and improved MUSIC algorithm's advantage of more accurate estimation of coherent source DOA,which can reduce the error of coherent source location while ensuring the accuracy of non-coherent source location. Simulation results show that this method applies to direct position determination for coherent signal. And it performs better than classic MUSIC even under nearer the distance of signals,low-SNR or low-snap situation.
引文
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[13]郑桂妹,陈伯孝,杨明磊,等.基于电磁矢量阵列的加权极化平滑解相干算法[J].系统工程与电子技术,2012,34(4):637-643.
[2]Weiss A J. Direct position determination of narrowband ra-dio frequency transmitters[J]. IEEE Signal ProcessingLetters,2004,11(5):513-516.
[3]冯奇,曲长文,周强.多运动站异步观测条件下的直接定位算法[J].电子与信息学报,2017,39(2):417-422.
[4]Amar A,Weiss A J. Localization of Narrowband RadioEmitters Based on Doppler Frequency Shifts[M]. IEEEPress,2008,56(11):5500-5508.
[5]Weiss A J,Amar A. Direct geolocation of stationary wideband radio signal based on time delays and Doppler shifts[C]//Statistical Signal Processing,2009. Ssp'09. Ieee/sp,Workshop on. IEEE,2009:101-104.
[6]Oispuu M,Nickel U. Direct detection and position determination of multiple sources with intermittent emission[J]. Signal Processing,2010,90(12):3056-3064.
[7]闫锋刚,刘秋晨,邵多,等.基于谱分解的降阶求根MUSIC算法[J].电子与信息学报,2017(10):2421-2427.
[8]Schmidt R. Multiple emitter location and signal parameter estimation[J]. International Journal of Engineering Research,2013,2(3):276-280.
[9]徐友根,刘志文.电磁矢量传感器阵列相干信号源波达方向和极化参数的同时估计:空间平滑方法[J].通信学报,2004,25(5):28-38.
[10]陈辉,黄本雄,王永良.基于互相关矢量重构的解相干算法研究[J].系统工程与电子技术,2008,30(6):1005-1008.
[11]李会勇,刘芳,谢菊兰,等.一种改进的极化敏感阵列解相干算法[J].电子与信息学报,2014,36(11):2628-2632.
[12]He J,Jiang S,Wang J,et al. Polarization Difference Smoothing for Direction Finding of Coherent Signals[J].IEEE Transactions on Aerospace&Electronic Systems,2010,46(1):469-480.
[13]郑桂妹,陈伯孝,杨明磊,等.基于电磁矢量阵列的加权极化平滑解相干算法[J].系统工程与电子技术,2012,34(4):637-643.