摘要
由于水声环境的复杂性,存在着海洋噪声,海水吸收,多途效应等一系列问题,水声定位的精度一直很难提升。给出了水声定位的系统结构框图,采用了时延波束成形技术对天线阵列接收信号进行滤波处理。仿真结果表明定位信号经过时延波束成形后,波束图就会在所需的方向上得到加强,而在其他方向上减弱,达到了增强信号、抑制噪声的效果。模拟了东海海域环境对水声定位系统做了仿真,未经过波束成形的接收阵输出信噪比很小,无法判断来波的方向。经过波束形成处理后,阵列的输出信噪比增大,在信号源的方向呈现明显的输出峰值,测向效果得到显著改善。
Due to the complexity of the underwater acoustic environment,there are ocean noise,water absorption,multi-path effects and other issues,it is difficult to improve the accuracy of acoustic positioning.This paper gives the structure of acoustic positioning system,and the time-delay beamforming technology is used to filter the received signal.The simulation results also indicate that after beamforming,the beam pattern will be strengthened in the desired direction,and weakened in the other direction,achieve the effect of enhanced signal,restrain the noise.This paper simulates the environment of the East China Sea,without beamforming the output signal-to-noise ratio of receiving array is very small,we could not judge to wave direction.After beamforming,the output SNR increases,showing a clear peak output in the direction of the signal source,to measure the accuracy of direction finding is significantly improved.
出处
《电子测量技术》
2014年第11期42-45,共4页
Electronic Measurement Technology
