中文摘要：

针对多波束测深声呐相位差检测法中噪声严重影响相位差估计的质量,使得深度测量的数据出现偏差的问题,采用理论分析和计算机仿真的方法,研究了噪声干扰对相位差估计的影响并有针对性地提出了减小测量误差.提高深度测量的可信度的信号处理方法.研究结果表明,噪声对相位差测量的影响在接收条带的不同部分是不同的,采用较大的子阵间距,利用相干信号的幅度信息和使用带宽可变的滤波器能有效降低噪声干扰,提高相位差估计的精度,实测数据处理证实了信号处理方法的有效性和可行性.

英文摘要：

In considering the problem of the precision of phase difference estimation and the quality of the bathymetric data being seriously influenced by noise interference,theoretic analysis and computer simulation were used to study the impact of the noise on phase difference estimation,and useful signal processing methods were proposed to decrease measurement bias and increase the reliability of sonar systems.The results indicate that noise influence on phase difference is not the same in different parts of one bathymetric swath.Using wide subarray spacing,the information of signal amplitude and variable bandwidth filtering can decrease the noise and improve the phase difference estimation precision.The signal processing methods are illustrated by data from a 300 kHz multibeam echo sounder.