Single-near-field-correction-source-based towing linear array formation estimation method and apparatus

Abstract

The invention belongs to the field of array signal processing to realize accurate azimuth control of a correction source, thereby improving the formation estimation precision. Therefore, the inventionprovides a single-near-field-correction-source-based towing linear array formation estimation method and apparatus. The apparatus is composed of a towing ship, a near-field correction source, a towing linear array, an array element, a signal acquisition module, a signal transmission module and a signal processing module. The near-field correction source is installed at the head or tail of the towing ship and the position coordinate of the correction source is determined by a position sensor; the array element receives an acoustic signal propagated by an underwater acoustic channel and converts the acoustic signal into an electric signal; the signal acquisition module collects the electric signal and converts an analog signal into a digital signal; and all array element data are packaged and coded in the signal transmission module and transmits the processed data to the signal processing module. The single-near-field-correction-source-based towing linear array formation estimation method and apparatus are mainly applied to the array signal processing occasion.

Description

technical field [0001] The invention belongs to the field of array signal processing, in particular to a method and device for estimating the array shape of a towed linear array based on a single near-field correction source. Background technique [0002] Towed line array sonar has been widely used in marine monitoring and strategic early warning, etc., but due to the change of hull speed, sudden turning, disturbance of ocean currents, etc., the towed array bends, and most array signal processing algorithms such as multiple signal classification ( Multiple Signal Classification, hereinafter referred to as MUSIC), subspace fitting, etc., all realize positioning on the premise that the formation is accurately known, so the formation must be corrected before estimating the azimuth of the sound source. The current active array estimation methods all assume that the auxiliary correction source is a far-field source, and the aperture of the towed line array sonar system is general...

AI Technical Summary

Problems solved by technology

At present, the active array estimation methods all assume that the auxiliary correction source is a far-field source, and the aperture of the towed line array sonar system is generally large, and it is necessary to place a correction source with an accurate and known azimuth far away from the ship and other detection platforms. Due to the complex sea conditions at sea, it is difficult to ensure the accurate orientation of the far-field correction source, which makes the corrected formation have a large error compared with the actual formation, which greatly limits the actual application

Images