Tracking method before detection of underwater weak target echo based on high refresh rate acoustic pulse

Abstract

A tracking method before detection of underwater weak target echoes based on high-refresh-rate acoustic pulses involves the field of signal processing. Aiming at the problems of low detection efficiency due to interference caused by unstable underwater environments and low refresh rates in the prior art, The method includes the following steps: Step 1: Based on the high-power low-refresh-rate signal, increase the number of transmitted sound pulses in the same period, and reduce the power of a single transmitted sound pulse under the condition that the transmitted energy in the period is constant, so as to obtain a low-power high-frequency signal. Refresh rate signal, and use it as the transmission signal; Step 2: Perform matched filter processing on the echo signal received by the active sonar detection system; Step 3: Combine the motion state of the weak target and the result of the matched filter processing in Step 2 to establish The state equation and measurement equation of the target; Step 4: Combine the measurement value obtained in Step 2 with the motion equation and measurement equation established in Step 3, and then process it through the tracking method before detection to obtain the detection and tracking results of weak targets .

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a tracking method before detection of an underwater weak target echo based on a high refresh rate sound pulse. Background technique [0002] The detection and tracking of underwater weak targets has always been a hot and difficult problem in both military and civil fields. In underwater acoustic detection, active detection is widely used due to its strong controllability and high accuracy. However, the active detection of weak underwater targets is still a difficult point. First of all, for long-distance target detection, the transmission period of the acoustic pulse is long, and the target is extremely prone to maneuver during this period. The low refresh rate of the transmitted signal leads to a decrease in detection efficiency, and there will be situations such as wrong tracking and missing tracking of the target. Secondly, in the detection process, there are various unknown...

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Problems solved by technology

[0004] The purpose of the present invention is to propose an underwater weak target echo detection based on high refresh rate acoustic pulses in order to solve the problem of low detection efficiency caused by interference caused by unstable underwater environment and low refresh rate in the prior art front tracking method

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