Use Of The Signal Phase Matching Of High-resolution Doa Estimation Algorithm

In recent years, with the development of the array signal processing and increase of demand of the national defence construction, the more and more attention have been paid to high-resolution methods of direction estimation, and the high- resolution algorithms tremendously arise at the historic moment. But there are some of problems in the algorithms such as the arrays with much more sensors, high computational complexity and inefficacy or low definition when applied to coherent signals. In this thesis, a new method of estimating arrival angles of coherent signals? ─lgorithm of Signal Matched-Phase (also called ASMP) is presented. Based on a three-sensor array and the technique of conventional beam-form, the algorithm can be used to separate coherent sources with high definition. The principal and the computing model of ASMP are given in the thesis, and the directional characteristics of ASMP by using a three-sensor array are analyzed. The simulation methods and processes of ASMP curve fitting and smoothing as well as the coherent integrator are discussed in the thesis. A large number of computer simulation results are given in considerable detail. The other high resolution method IMP algorithm is also simulated and compared with ASMP in the performance of dividing the coherent sources under the same conditions of the ratio of signal and noise and numbers of sensors. The theoretical analysis and the computer simulation results of ASMP show that a simple three-sensor array can be used to form a beam, which has verY sharp directivity and very low side lobe level by using ASMP. When one signal input the array, the maximum value of the beam aim at the azimuth of signal, while there are two signals (they are coherent signals) input the array, two peak values wouldn抰 appear on the simulated-curve. In fact, the maximum value of the beam always aim at the average value of azimuth of two space sources, and one quarter power spectrum of the array output are just the position of two coherent sources. As compared with other high-resolution methods, the ASMP algorithm has many of strongpoint, for instance simple array structure, light calculational load, high resolving power (within the reach of 0.20 in dividing coherent sources), especially in dividing coherent sources that have a small space interval. The research shows that ASMP will be applied widely to high-resolution direction estimation of coherent sources.