一种新的频域波束切换算法  

A Frequency Domain Switching-Beam Algorithm

作　　者：苏蒍[1] 黄建国[1] 韦周芳[1] 雷济声[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《兵工学报》2007年第7期830-833,共4页Acta Armamentarii

基　　金：国家自然科学基金资助项目(60572098)

摘　　要：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无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)远程水声通信系统。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束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性能仿真和湖试实验。仿真结果表明:FDSB算法在单元接收信噪比为-10 dB的情况下仍可以稳定、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的情况下,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.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 switchingbeam （FDSB） algorithm was proposed. The principle of the proposed algorithm is that the beam is selected and switched by comparing amplitudes among output signal frequency spectrum peak values in frequency domain. The performance simulation with the proposed algorithm 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 receiving SNR of - 10 dB. The results of the communication test of underwater in the lake at the distance of 25 km show that the beam is selected and 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 transmission end.

关 键 词：通信技术 频域波束切换算法 远程水声通信 M元频移键控 水下无人航行器 

分 类 号：TN911[电子电信—通信与信息系统]