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Tracking algorithm for time difference of arrival of signals for acoustic passive positioning

A passive positioning and tracking algorithm technology, applied in positioning, measuring devices, instruments, etc., can solve the performance impact of generalized cross-correlation method and increase the calculation amount of TDOA estimation, etc.

Inactive Publication Date: 2015-03-04
SOUTHEAST UNIV
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Problems solved by technology

Although the generalized cross-correlation method improves the estimation performance of TDOA, this method also increases the calculation amount of TDOA estimation
In addition, the performance of the generalized cross-correlation method is also affected when the signals arriving through multiple paths are superimposed in the received signal

Method used

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  • Tracking algorithm for time difference of arrival of signals for acoustic passive positioning
  • Tracking algorithm for time difference of arrival of signals for acoustic passive positioning
  • Tracking algorithm for time difference of arrival of signals for acoustic passive positioning

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Embodiment Construction

[0058] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0059] according to figure 1 , introducing the signal arrival delay difference tracking algorithm for underwater acoustic passive positioning in this embodiment, including the following steps:

[0060] (1) Variable initialization, frame the signal;

[0061] Specifically:

[0062] 1) Define an array TraceArray containing 5 elements, and set the initial value to 0; define the counter variable Counter, set it to 0; define the counter variable FrameCounter, set it to 1;

[0063] 2) Suppose the dist...

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Abstract

The invention discloses a tracking algorithm for time difference of arrival of signals for acoustic passive positioning. The tracking algorithm can effectively solve the problem of multi-path interference in an existing acoustic passive positioning algorithm on the basis of arrival time difference, and arrival time difference initial values of a tracking algorithm are not required to be manually specified. The tracking algorithm includes steps of (1), initializing variables and framing the signals; (2), estimating a cross-correlation function value sequence of signal frames by a discrete Fourier transformation method; (3), determining the time difference of arrival of the current signal frames at two hydrophones; (4), using the latest estimated value of the time difference of arrival as a tracking initial value; and (5), estimating a cross-correlation function value sequence of a new signal frame, searching the local maximum value of the cross-correlation function value sequence around a subscript of a cross-correlation function value sequence corresponding to the tracking initial value, computing the time difference of arrival, using the computed time difference of arrival as an estimated value of the time difference of arrival of the new signal frame, updating the tracking initial value, repeating the same procedure until all signal frames are processed. The signal frames are received by the two hydrophones.

Description

technical field [0001] The invention relates to an underwater acoustic passive positioning method in the technical field of underwater acoustic signal processing, in particular to a signal arrival delay difference tracking algorithm for underwater acoustic passive positioning. Background technique [0002] Underwater acoustic passive positioning is an important topic in the field of underwater acoustic signal processing, and it is also a difficult problem. At present, there are three main types of underwater acoustic passive positioning methods: methods based on time delay difference of arrival (TDOA), target motion analysis (TMA) methods and matching field processing methods (MFP). [0003] The method based on TDOA is one of the most commonly used underwater acoustic passive positioning algorithms, and is widely used in real-time underwater acoustic passive positioning systems. The algorithm estimates the target azimuth, distance and depth parameters according to the relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/18
Inventor 安良
Owner SOUTHEAST UNIV
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