一种强干扰条件下微弱信号DOA估计的新方法

给出了一种基于均匀线性阵列的既能抑制强烈干扰,又能同时进行微弱信号DOA估计的算法。在已知强干扰源个数和入射方向的前提下,先使用改进的波束形成方法,在予阵上进行波束形成以抗干扰,再对加权后的子阵进行微弱信号的DOA估计。该方法的优点是当干扰和希望信号处在同一个波束内时,不需要提高信号的信噪比就可以正确地估计出信号的入射方向。理论分析和计算机仿真都表明该算法是有效的。

A Novel Algorithm for Weak Signals' DOA Estimation under Intensive Interferences

A novel algorithm both for restraining intensive interferences and for estimating weak signals' DOA(Direction Of Arrival) information is presented on the basis of uniform linear array. Under the assumption knowing the number and directions of intensive interferences, first, the algorithm forms the beam on the sub-array level with the improved beam-forming method to constrain interferences; then, the algorithm estimates weak signals' DOA information based on all of these weighed sub-arrays. When both the desired signal and the interference are in the same beam, the merit of this algorithm shows higher estimation accuracy than that of high-resolution methods without improving the SNR for weak signal. Both the theoretical analysis and computer simulation indicate that the algorithm is effective.