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A method and system for extracting the time when a high-speed rigid body hits a moving target on the water surface

A technology of moving target and extraction method, which is applied in the field of extracting the moment when a high-speed rigid body collides with a moving target on the water surface, can solve the problems affecting the time delay difference and the accuracy of target positioning, and achieve the effect of accurate and automatic extraction

Active Publication Date: 2020-09-18
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

The extraction of time directly affects the delay difference, and ultimately affects the positioning accuracy of the target.

Method used

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  • A method and system for extracting the time when a high-speed rigid body hits a moving target on the water surface
  • A method and system for extracting the time when a high-speed rigid body hits a moving target on the water surface
  • A method and system for extracting the time when a high-speed rigid body hits a moving target on the water surface

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Experimental program
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Embodiment

[0065] According to the test process, the hydrophone is about 350 meters away from the sound source, and the water depth is about 4.5 meters. The main steps of the extraction process when the high-speed rigid body hits the moving target on the water surface are as follows: figure 1 As shown, proceed as follows:

[0066] (1) The hydrophone receives the underwater acoustic information during the period when the high-speed rigid body hits the moving target on the water surface, and the obtained original underwater acoustic signal w_signal and its corresponding time data, such as figure 2 As shown, the speed of the high-speed rigid body here is 800m / s;

[0067] (2) Perform central moving average filtering on the underwater acoustic signal to obtain the filtered underwater acoustic signal w_signal_filter and its corresponding time data, such as image 3 As shown, among them, the center moving average filtering is carried out according to the following formula:

[0068]

[006...

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Abstract

The invention discloses an extraction method and an extraction system for a time of impact of a high-speed rigid body on a moving target on a water surface. The method includes the following steps: step 1. receiving a submarine sound signal of the impact of the high-speed rigid body on the moving target on the water surface by utilizing a hydrophone; step 2. performing filtering processing on thesubmarine sound signal; step 3. setting an effective factor of a signal amplitude; step 4. calculating a mean value of the submarine sound signal; step 5. marking all peak points; and step 6. resolving a point of intersection of a start oscillation point of a first peak value and the mean value, wherein the point of intersection is the impact time. The method obtains the time of the impact of thehigh-speed rigid body on the moving target on the water surface based on the submarine sound signal, can calculate time delay information between different primitives in a synchronous beacon type by utilizing the time, and can resolve a landing position of the rigid body through combination of a space intersection principle.

Description

technical field [0001] The invention relates to a time extraction method of an underwater acoustic passive signal, in particular to a method and system for extracting the time when a high-speed rigid body hits a moving target on a water surface based on the underwater acoustic passive signal. Background technique [0002] The underwater acoustic passive signal feature extraction technology is a hot and difficult research topic in the world today, especially in the military field such as the application of underwater target positioning. The extraction of the time when a high-speed rigid body hits a moving target on the water surface is an important technical guarantee for the unification of target positioning time in water. It has important reference value for rigid bodies such as missiles hitting targets such as ships. Receiving a known sound source signal has great uncertainty and interference. Therefore, how to accurately extract the characteristic time of passive signals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/72G01S5/18
CPCG01S1/72G01S5/18
Inventor 赵俊鹏赵晨张海岩张宇飞姜文征
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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