Abstract
For the problem of mainlobe direction shifting that is caused by the mainlobe interference suppression based on blocking matrix preprocess, an effective method is proposed which is based on the combination of diagonal loading and linear constraints. Therein, the reason for mainlobe direction shifting is analyzed and found to be that the covariance matrix mismatch exists in the realization of the adaptive beamforming. Therefore, the diagonal loading processing is used to overcome the mismatch and correct the mainlobe direction shifting, and the linear constraints are used to make sure of the beam pattern nulling in the interference directions; then the desired performance of adaptive beamforming is obtained. Simulation results attest the correctness and effectiveness of the proposed method, and they also show that the proposed method is insensitive to the selection of diagonal loading level, which means the loading factor is easy to choose.
Highlights
The adaptive array can be used to suppress the space interference effectively, especially when the interferences are located out of the mainlobe
Array antenna can realize the interference suppression by efficient adaptive beamforming algorithm; when the interference is located in the mainlobe, the conventional adaptive beamforming techniques will lead to the sidelobe level rising and mainbeam direction shifting; the desired signal will be not in the beam pointing direction, and the output signal to interference plus noise ratio (SINR) will decline and the false-alarm probability will rise sharply; the mainlobe shifting will affect the accuracy of angle estimation [1,2,3,4,5,6]
Mainlobe interference suppression algorithm which is based on the blocking matrix preprocess attracted extensive attention due to the clear ideas and remarkable effect [6], but this method leads to the problem of the mainlobe direction shifting
Summary
The adaptive array can be used to suppress the space interference effectively, especially when the interferences are located out of the mainlobe. Many methods are put forward to suppress the mainlobe interference [5,6,7,8,9], but when the mainlobe interference is eliminated, there will be some other problems at the same time, such as the mainlobe direction shifting and sidelobe rising. Mainlobe interference suppression algorithm which is based on the blocking matrix preprocess attracted extensive attention due to the clear ideas and remarkable effect [6], but this method leads to the problem of the mainlobe direction shifting. This paper analyses the reason of the direction shifting of beamforming algorithm based on the blocking matrix preprocess in theory, and gives the corresponding solution which is simple and effective in realization
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