Single horizontal array passive speed measurement and distance measurement device based on sound field interference fringe and method

Abstract

The present invention relates to a single horizontal array passive speed measurement and distance measurement method based on sound field interference fringe, belonging to the field of underwater acoustic engineering and sonar signal processing. The method comprises a step of carrying out condition processing and collection on the signal received by each array element of a sonar, a step of carrying out beam formation on the collected signals and obtaining an azimuth time journey map after accumulation, a step of tracking an interested object, taking a tracking beam as object azimuth estimation, carrying out short-time Fourier transform spectrum analysis on the output of the tracking beam, obtaining the interference structural map of the interested object, selecting two equal time intervals of a single horizontal array in a motion process, forming interference structural maps, carrying out preprocessing and Radon transform on the two interference structural maps, and estimating an object heading angle with the combination of the waveguide invariant theory, and a step of realizing the estimation of the distance and speed of the interested object. According to the method, the physical nature of an underwater sound field is fully dug, the prior knowledge of a marine environment is not needed, the algorithm is simple and easy and is convenient and flexible to use, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic engineering and sonar signal processing, and relates to a passive distance measurement and speed estimation method for an underwater target, in particular to a single horizontal array target passive speed measurement and distance measurement method based on sound field interference fringes. Background technique [0002] The speed and distance information of underwater targets can be used for sonar target identification and decision-making assistance, and can provide target indication for weapon systems, etc. Therefore, as one of the main tasks of sonar systems, underwater acoustic workers have always been committed to solving The problem. (The towed line array sonar has become the most important warning sonar for surface ships and submarines due to its large base array size, low operating frequency, and long detection distance, and it is also the most important torpedo warning sonar. How to use...

AI Technical Summary

Problems solved by technology

Foreign countries use the vertical array guide source method for passive ranging. Domestic scholars have conducted follow-up research on this method and conducted corresponding sea trials. The biggest feature of this method is that it does not require prior knowledge of the waveguide environment and is robust Good, high positioning accuracy, but the vertical array should not be applied to the motion platform (see: Sourcerangingwithminimalenvironmentalinformationusingavirtualreceiverandwaveguideinvarianttheory, "J.Acoust.Soc.Am.", 2000, 108(4): 1582-1594; target distance positioning in the environment of sea depth changes, "Acoustic Technology", 2009, 28(5): 586-591 pages); domestic scholars have developed the "Guided Sound Source Horizontal Array Passive Ranging Technology", using horizontal arrays instead of vertical arrays is an improvement. distance is more suitable for application, but the algorithm is processed in the field of array elements, and the horizontal array is only used for spatial sampling, so the algorithm does not make full use of the space gain of the array (see: application of waveguide invariant principle in target ranging, "Acoustic Technology", 2009, 28 (2): 45-46 pages); also proposed dual-array elements or dual-array passive ranging, but requires the target to have the shortest passing distance, although there are important application prospects, this is not complete Conforms to the use requirements of sonar (see target motion parameter estimation and passive ranging based on waveguide invariants, "Acta Acoustica Sinica", 2011, 36(3), pp. 258-264)

Although the literature (see: Dual horizontal array (element) passive ranging based on sound field interference structure, "Acta Acoustica Sinica", 2012, 37(4), pp. 440-447) has developed a more universal Passive ranging algorithm, but it adopts dual-array (element) model, which is not easy to apply

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