一种非均匀天线组阵下信号时延最优化补偿方法

在深空天线组阵接收中,各接收天线往往间距较远,各路信号到达时间不同,需要完成时延补偿与对准才能有效合成。非均匀天线组阵下,各路信号时延估计精度不同,在对信号进行时延补偿时需要根据信号信噪比采取不同的补偿策略。在分析基于准合成输出信号为参考的时延补偿对准算法的基础上,从加快算法收敛速度的角度,优化补偿系数,提出了一种非均匀天线组阵下信号时延优化补偿方法。仿真实验表明该算法在不降低合成性能的前提下,收敛速度与基于准合成输出信号为参考的时延对准算法相比有较大提高。

An Optimal Time-delay Compensation Technique for Non-uniform Antenna Arraying

In the deep space network, the antennas are spatially separated and the received signals are provided with different arrival time-delays. The time-delay differences should be compensated before combination. In a non-uniform antenna, the time-delay accurcy of each signal is different which requires different compensation strategy according to the SNR. This paper investigates into the combined output refered time-delay alignment technique and optimizes the factors in order to accelerate the convergence speed. An Optimized time-delay compensation technique is proposed. Numerical results show that the proposed technique converges faster than the combined output refered time-delay alignment technique without performance lost.