一种新的频域波束切换算法

传统的时域波束切换算法( TDSB)在接收基阵阵元数少、单元接收信噪比低的情况下法正确检测指向信号入射方向的波束，获得阵增益。不适用于水下无人航行器(UUV)远程水声信系统。针对这一问题，提出了一种频域波束切换算法( FDSB)．该算法通过在频域中比较各波输出信号频谱峰值的大小对波束进行选择、切换。利用设计的UUV声接收基阵对算法进行了能仿真和湖试实验。仿真结果表明：FDSB算法在单元接收信噪比为 10 dB的情况下仍可以定、正确的切换波束；湖试25 km距离上通信实验结果表明：在UUV与信号发射端有相对运动情况下，应用本文提出FDSB算法对波束进行选择、切换，通信误码率小于10-4.

A Frequency Domain Switching-Beam Algorithm

Traditional time domain switching-beam (TDSB) algorithm is incapable of tracing the DOA while the SNR of the received signal is low. The algorithm is not suitable for underwater acoustic telecommunication system of UUV. In order to solve this problem, a frequency domain switching- beam (FDSB) algorithm was proposed. The principle of the proposed algorithm is that the beam is se?lected and switched by comparing amplitudes among output signal frequency spectrum peak values in frequency domain. The performance simulation with the proposed algorittim and the lake test were completed by using the acoustic receiving array of designed UUV. The simulation results show that the beam is switched steadily and correctly by FDSB algorithm under the condition of array element re?ceiving SNR of — 10 dB. The results of the communication test of underwater in the lake at the dis?tance of 25 km show that the beam is selected ana switched by FDSB algorithm and the code error rate is less than 10-4 at the condition of existing relative displacement between UUV and signal transmis?sion end.