基于多普勒频移的双基地声纳目标速度测量

Target speed vector estimation based on bistatic Doppler shift

针对单基地声纳仅可获得目标的径向速度以及双基地声纳有大量冗余信息的问题,提出利用单/双基地复合工作的声纳系统求解目标二维速度矢量(速度大小、航向)的方法。为了获得目标的二维速度矢量,在双基地声纳系统中,分析了双基地声纳多普勒频移的特性,并与单基地作了比较;结合单、双基地所获得的多普勒频移特性信息,给出了目标二维速度矢量的两种计算方法;并对目标速度测量误差进行了分析。结果表明,采用单/双基地复合工作的声纳系统,可以完成目标二维速度矢量的测量,而测量误差则与系统的频移分辨力及目标与收、发基地间的相对位置有关。

Because a monostatic sonar can only obtain the radial speed, and the bistatic one has lots of redundant information, a sonar system operating on them both complexly is put forward to obtain the two- dimensional（2-D） target speed vector. For this reason the characteristic of Doppler frequency shift in a bistatic sonar system is analyzed and is compared with the rnonostatic one. Two methods for calculating the 2-D target speed vector are given by combining the performances of Doppler frequency shift characteristics obtained from both of monostatic and bistatic systems. Moreover, the measurement error of speed is also analyzed. Measure- ment result shows that the proposed methods are effective, and the measurement error depends on the sonar＇s resolving power of frequency shift and the relative position between targets and source/receiver bases.