波束合成通信抗干扰算法研究

The Research of Communication Anti Jamming Algorithm Based on Beam-forming

传统的卫星通信抗干扰算法不需要主波束对准某个方向,抗干扰后SNR(信噪比)会有所降低。该文在已知通信卫星位置的条件下,考虑波束合成,用自适应MVDR(minimum variance distortionless response)的方法,不仅实现抗干扰的效果,还能提高输出的信噪比。仿真结果表明:在四阵元均匀圆阵列中使用波束合成抗干扰,能在没有干扰的情况下对输出信噪比提高5.89 d B,在有强干扰的情况下对输出信噪比提高5 d B以上。同时考虑矩阵求逆的困难,推导了具有约束的LMS算法(least-mean-square algorithm)。由于实际运用中卫星位置的估计存在一定的误差,针对此误差进行仿真分析,得出结论:卫星位置估计的误差在5°内输出的合成增益不会减少。

It does not need the main beam alignment in a certain direction for the traditional satellite communication antiinterference algorithm,this will lead to the decrease of SNR decrease after interference-mitigating. In this paper,we consider beam-forming with the method of MVDR on the bases that the locations of communication satellites are known. The results show that not only the mitigation of interference is realized,but also an improvement of the SNR of output. The simulation results also show that： with the usage of beam-forming anti-interference in four element uniform circular array,the SNR of output can achieve an improvement of 5. 89 d B if there is no interference. With Strong interference,the SNR of the output can improve more than 5 d B. Considering the difficulties of inverse matrix,LMS algorithm is deduced with constraints. Due to practical use in the estimation of the satellite position exist certain errors,simulation analysis is carried out for this error. It is concluded that the error of the satellite position estimation will not reduce the output of the 5 degrees of the synthesized gain.