同步水声跟踪定位系统软件抗距离模糊技术研究

On resolving range ambiguities by software in synchronous underwater acoustic tracking system

同步水声跟踪定位系统通过时延测量进行定位,当信号传播时延大于脉冲重复周期时,就会出现距离模糊。距离模糊是远程高帧率定位系统不可避免的问题。以往多采用硬件方法抗模糊,使得系统趋于复杂。本文提出了两种软件抗模糊方法:举手表决法和参考位置标示法,前者利用真解的一致性抗模糊,无需任何先验信息;后者利用目标的参考位置抗模糊,需要目标初始就位点这一先验信息。文中给出了算法原理和适用条件。软件抗模糊方法简化了系统设备,海试结果验证了算法的有效性。

Synchronous underwater acoustic positioning systems locate target by measuring pulses＇ propagating time. Range ambiguity is an unavoidable problem in the active high data rate underwater acoustic positioning systems. It appears when pulse＇s propagating time is longer than its repetition period. Lots of approaches have been put forward up to now but most of them take measures on hardware, which make the system more complicated. An idea of resolving ambiguities by software is provided in this article with two representative approaches. One approach is to resolve ambiguities by the majority rule and the other by a given reference to the target location. The former needs none of information beyond the positioning system and the later requires target＇s original position where it starts off. The theory and conditions of both methods are provided in this article. Both methods simplify the system and have been proved to be valid by sea trial.