基于四阶累积量切片的宽带传播算子测向方法

四阶累积量的盲高斯性改善了高斯噪声存在情况下的方位估计算法性能,四阶累积量切片同样具有盲高斯性,结合改进的传播算子法(MPM)不但可以降低算法的运算量,还可以改善算法的性能。首先利用旋转不变方法(RSS)对宽带信号进行聚焦处理,聚焦处理后的矩阵输出再求其四阶累积量切片矩阵,对该矩阵利用改进的传播算子法得到测向结果。论述了四阶累积量切片适用于改进的传播算子法的原理,并通过仿真验证了算法在盲高斯噪声、运算量及测向性能方面的优越性。

Modified wide-band signal DOA finding method based on the 4th-order cumulant slice modified propagator matrix

Using the 4th-order cumulant's blindness to Gaussian noise,the performance of DOA estimation is improved.The matrix which is called the 4th-order cumulant slice is derived from the 4th-order cumulant.Based on the 4th-order cumulant slice,which retains the peculiarity of Gaussian noise blindness,the modified propagator matrix method(MPM) is used to reduce the computational complexity and gain a better estimation result in DOA.First all the subspaces' signals are focused,and then the 4th-order cumulant slice and MPM are applied to the output of focus.The basic principles of the method proposed is discussed,and then the performance of the method is illuminated by simulations.