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Position estimation method of underwater sounding target based on laser multi-point coherent detection and device for realizing the method

A technology of target position and photoelectric detector, which is applied in the direction of measuring device, water resource assessment, sound wave reradiation, etc., can solve the problems that the target position detection of underwater sound cannot be realized, and achieve the effect of good flexibility and maneuverability

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the "laser-acoustic" joint detection method cannot realize the position detection of the underwater sound target, and provide two methods for estimating the position of the underwater sound target based on laser multi-point coherent detection and the method for realizing the above two methods device

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  • Position estimation method of underwater sounding target based on laser multi-point coherent detection and device for realizing the method
  • Position estimation method of underwater sounding target based on laser multi-point coherent detection and device for realizing the method
  • Position estimation method of underwater sounding target based on laser multi-point coherent detection and device for realizing the method

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specific Embodiment approach 1

[0031] Specific implementation mode one: combine Figure 1 to Figure 5 To illustrate this embodiment, the method for estimating the position of an underwater sounding target based on laser multi-point coherent detection described in this embodiment is a simultaneous multi-point detection method, which is:

[0032] Step 1. Randomly select four points on the water surface as detection points, and the four detection points form a square;

[0033] Step 2, using the underwater acoustic signal laser coherent detection method to detect the four detection points, and obtain the detection signals I of the four detection points respectively d (t), that is, the signal received by the photoelectric detector, and spectrum analysis or phase demodulation is performed on the detection signals of the four detection points to obtain the amplitude values ​​of the water surface acoustic waves at the four detection points;

[0034] Step 3. Determine whether the amplitude values ​​of the water sur...

specific Embodiment approach 2

[0047] Specific implementation mode two: combination Figure 6 Describe this embodiment. This embodiment is a further limitation of the method for estimating the position of an underwater sounding target based on laser multipoint coherent detection described in Embodiment 1. According to the measurement principle in Embodiment 1, the detection in Step 2 Signal I d (t) is obtained by:

[0048] The light amplitude E of the reference light b The distribution over time t is:

[0049] E. b (t)=A b sin(ω 0 t+kz b +φ) (1)

[0050] In the formula, A b is the reference light amplitude E b the amplitude of

[0051] ω 0 is the laser angular frequency;

[0052] k is the laser wave number;

[0053] z b is the optical path of the reference light;

[0054] φ is the initial phase of the laser.

[0055] Measuring the light amplitude E of light m The distribution over time t is:

[0056] E. m (t)=A m sin[(ω 0 +ω d )t+kz m +φ] (2)

[0057] In the formula, A m To measure ...

specific Embodiment approach 3

[0073] Specific Embodiment Three: The method for estimating the position of an underwater sounding target based on laser multi-point coherent detection described in this embodiment is an asynchronous multi-point detection method. Point detection, get the detection signal I of each detection point d (t), that is, the signal received by the photoelectric detector, and spectrum analysis or phase demodulation is performed on the detection signal of each detection point to obtain the amplitude value of the water surface acoustic wave at each detection point, and the maximum amplitude value of the water surface acoustic wave The location of the probe point serves as a best estimate of the location of the center of the sound source.

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Abstract

A position estimation method of an underwater sounding object on the basis of laser multipoint coherent detection and a device for implementing the method provided by the invention relate to the position detection technology of an underwater sounding object. The object of the invention is to solve the problem that a laser-sound joint detection means cannot realize the position detection of an underwater sounding object. Firstly, a laser coherent detection system is established, then the laser coherent detection system is configured to perform water surface sound wave detection of a plurality of positions of an interesting water area, the measurement of water surface sound wave amplitudes of each point is realized through adoption of spectral analysis, phase demodulation and the like, finally, according to the water surface sound wave amplitude distribution characteristics, the position having max amplitude is the optimal estimation of an underwater sound source center. The method and device provided by the invention are able to realize the aerial detection of an underwater sounding source position, two methods such as synchronous multipoint coherent detection or asynchronous multipoint coherent detection according to actual demands may be selected, therefore the flexibility and the mobility are very good, and the method and device provided by the invention are applicable to underwater sounding object detection and air-to-underwater communication.

Description

technical field [0001] The invention relates to an underwater sound target position detection technology. Background technique [0002] Sonar technology, including underwater sounders, sonobuoys and towed sonars, is still the mainstream technology for underwater sound target detection. For example, sonar technology is used to search for the black box of MH370. The propagation characteristics of sound waves underwater, electronic equipment that completes underwater detection and communication tasks through electro-acoustic conversion and information processing, is divided into two types: active and passive. Due to the poor mobility, flexibility and concealment of shipborne sonar technology, the application of underwater acoustic target detection is limited. [0003] People hope to be able to realize the remote measurement of underwater sound targets, so the "laser-sound" joint detection method is proposed. The current laboratory research shows the potential of the "laser-sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/06
CPCG01S15/06G01S15/86Y02A90/30
Inventor 张晓琳张烈山唐文彦王军
Owner HARBIN INST OF TECH