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...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。展开更多
In order to solve the bearings-only passive localization problem in the presence of erroneous observer position, a novel algorithm based on double side matrix-restricted total least squares (DSMRTLS) is proposed. Fi...In order to solve the bearings-only passive localization problem in the presence of erroneous observer position, a novel algorithm based on double side matrix-restricted total least squares (DSMRTLS) is proposed. First, the aforementioned passive localization problem is transferred to the DSMRTLS problem by deriving a multiplicative structure for both the observation matrix and the observation vector. Second, the corresponding optimization problem of the DSMRTLS problem without constraint is derived, which can be approximated as the generalized Rayleigh quotient minimization problem. Then, the localization solution which is globally optimal and asymptotically unbiased can be got by generalized eigenvalue decomposition. Simulation results verify the rationality of the approximation and the good performance of the proposed algorithm compared with several typical algorithms.展开更多
文摘针对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。
基金co-supported by Science and Technology on Avionics Integration Laboratory and the Aeronautical Science Foundation of China(No.20105584004)
文摘In order to solve the bearings-only passive localization problem in the presence of erroneous observer position, a novel algorithm based on double side matrix-restricted total least squares (DSMRTLS) is proposed. First, the aforementioned passive localization problem is transferred to the DSMRTLS problem by deriving a multiplicative structure for both the observation matrix and the observation vector. Second, the corresponding optimization problem of the DSMRTLS problem without constraint is derived, which can be approximated as the generalized Rayleigh quotient minimization problem. Then, the localization solution which is globally optimal and asymptotically unbiased can be got by generalized eigenvalue decomposition. Simulation results verify the rationality of the approximation and the good performance of the proposed algorithm compared with several typical algorithms.