Deep sea weak multi-target depth long-time cumulative estimation method

Abstract

The invention relates to a deep sea weak multi-target depth long-time cumulative estimation method which comprises the following steps: firstly, obtaining arrival angle information of a signal on a vertical array, obtaining a power spectrum output by a beam and a two-dimensional power diagram output by the beam containing interference fringe information related to a target depth; carrying out coherent matching on the two-dimensional power diagram and a theoretical value of the interference fringe track, and extracting characteristic parameters related to the assumed target depth; determining the number and the depth of the targets according to the distribution of the characteristic parameters. Compared with the traditional numerical method based on the ray model, the method has the advantages that the calculation amount is greatly reduced; the two-dimensional stripe track reflects the correlation characteristic of signals in a period of time, and the matching with the two-dimensional power diagram outputted by the beam is a long-time coherent accumulation; the traditional time delay matching method carries out non-coherent accumulation after segmenting data, so the method is suitable for environments with lower signal-to-noise ratio, and the precision is higher.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic engineering, marine engineering, sonar technology, etc., and relates to a long-term accumulation estimation method for weak multi-target depths in the deep sea. The long-term accumulation method of multi-target depth estimation is suitable for the precise estimation of the depth of single or multiple broadband moving targets under the condition of extremely low signal-to-noise ratio in the deep sea environment. Background technique [0002] In the deep sea environment, the direct wave (including the sea surface reflection wave when the sea condition is good) propagating from the near-sea surface target to the large-depth receiving point is less affected by the characteristics of the water body and the bottom of the sea, the propagation loss is small, and the signal is stable, so it is considered to be Reliable, called reliable acoustic path. Through reliable acoustic path propagation, a receiv...

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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a deep-sea weak multi-target depth long-term accumulation estimation method, which overcomes the fact that the existing target depth estimation method cannot effectively achieve long-term coherent accumulation in the actual low signal-to-noise ratio environment shortcoming

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