Resolutions of some overlap signals based on MUSIC algorithm

In order to reduce resolution angle in direction finding system, a method based on MUSIC algorithm is proposed. According to the receiving characteristic of pulse signals in actual direction finding system, the method is proposed on the condition of some overlap signals. Because of the some overlap characteristic of signals, we can obtain a new covariance matrix by means of subtracting between two covariance matrixes which can be got from received data easily. One of the two covariance matrixes is got from the data of only one signal and the other one is from the data of two overlapped signals. It is known that we can estimate the direction of arrival from the covariance matrix of only one signal using MUSIC algorithm. Likewise, we can estimate another direction of arrival from the new covariance matrix which is obtained by the new method. Thereupon, we get the directions of arrival of two signals. Both simulation and the test based on actual direction finding system proved that the proposed method can get smaller resolution angle with well performance.