时延/时延差组合定位模型抗距离模糊技术研究

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,就会出现测距模糊。测距模糊是高帧率定位系统不可避免的问题。研究了基于时延测量的合作声信标定位系统中的抗距离模糊问题,提出了一种新的抗距离模糊技术,基于时延测量定位模型和时延差测距模型,推导了相应的软件抗模糊算法。该方法将两种定位模型的优点相结合,实现了无模糊的、高精度的水下定位。最后海试结果验证了算法有效性和可靠性。该算法不仅具有硬件抗模糊无法具有的优点,而且与以往的硬件、软件抗距离模糊算法相比,有更灵活的运用空间。

A combined-position-model method of resolving range ambiguities

An active underwater acoustic positioning/tracking system locates a target by measuring the range from the target to receiving sensors. Usually the target-receiver range is determined by the propagating time of a signal pulse. If this propagating time is greater than the pulse repetition period, more than one pulse will be received in one period. Thus we cannot decide which corresponds to a certain time. This is the problem of range ambiguity. Based on the passive ranging technology of three-element symmetrical array combined with the active positioning model, a method of resolving range ambiguity is proposed in this paper. Theories and algorithm are introduced and some sea trial results provided. The sea trial results show that the system is accurate, reliable and correct. This new method possesses merits that hardware methods cannot have, and has broader and more flexible applications compared to early software methods in synchronous systems without first-position and superfluous hydrophones.