异步水声跟踪定位中利用目标参考位置抗距离模糊方法

基于时延测量的水声跟踪定位系统，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．当目标信号发射时刻未知时系统工作于异步模式，此时发射和接收时钟存在固定时差．本文研究基于时延测量异步定位系统中的抗距离模糊问题，介绍一种利用目标初始就位信息实现软件抗模糊的算法，从异步定位模型出发，得出等价的抗模糊准则，依据准则推导了抗模糊算法及相应的目标参考位置取值范围．足够大的范围容限保证了算法工程实施的可行性和可靠性，最后海试结果验证了算法有效．该算法不仅具有硬件抗模糊无法具的优点，而且与同步定位系统的软件算法相比，在出现同步时钟精度低甚至漂移情况下具有更大的应用空间．

Resolving range ambiguities in asynchronous underwater acoustic tracking system by reference to target position

For underwater acoustic positioning system based on measurement of time_delay, range ambiguity appears when pulse's propagating time is longer than its repetition period. Range ambiguity is an unavoidable problem in active high data rate underwater acoustic positioning system. Positioning system may work at asynchronous style when signal's emitting time is unknown. In this case a fixed time difference exists between emitter's and receiver's clock. This paper proposed the problem of resolving range ambiguities in asynchronous tracking system based on time_delay measurement and a software method of resolving ambiguities by target's reference location was brought forward. The equivalence rule was obtained from the pcsitioning model, and based on this rule the algorithm of resolving ambiguities and the responding reference scope were derived. The reference scope is large enough to ensure the method's feasibility and security, and the method has been proved to be valid by sea trial. This method not only has merits that hardware methods cannot hold, but also has a broader application space compared with the software methods in synchronous systems when the clock has low precision and even excursion.