An Active Sonar Pulse Signal Direction Finding Method
A technology of pulse signal and active sonar, which is applied in direction finders using ultrasonic/sonic/infrasonic waves, directional multi-channel systems, systems for determining direction or offset, etc. It can solve problems such as phase ambiguity and direction finding ambiguity, Achieve the effect of easy realization and simple method
Active Publication Date: 2022-08-09
中国船舶重工集团有限公司第七一0研究所
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Problems solved by technology
In such a wide frequency range, there is no way to arrange hydrophone arrays at half-wavelength intervals like conventional directional positioning technology. When the distance between array elements is greater than half-wavelength, the time delay difference between the two elements receiving signals is often much greater than the signal period. phase ambiguity, which in turn leads to severe DF ambiguity
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[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0031] like figure 2 As shown, the active sonar pulse signal direction finding method of the present invention is as follows:
[0032] 1. Band-pass filtering is performed on the sonar signals received by each hydrophone of the right-angle three-element array; among them, the right-angle three-element array is as follows figure 1 shown.
[0033] 2. Perform square detection and integration on the filtered signal to obtain the envelope of the signal, and perform threshold detection on the envelope of the signal;
[0034] 3. If the leading edge of the signal envelope exceeds the threshold, record the leading edge time n of the three signals respectively. 1 , n 2 , n 3 . Then the rough measurement value n of the delay of 1-channel array element and 2-channel array element 12 =n 1 -n 2 . In the same way, the rough measurement value n of the 2-way a...
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The present invention provides a method of active sound pulse signal direction. The pulse signal received by the right -angle ternary arrays to obtain the signal package of the vein signal received by the water listener., FFT analysis of the data in the first 1 / 5 pulse width, estimate the signal frequency F; when the pulse width starts to 4 / 5 pulse width, save the data to calculate the phase difference;The delay correction values are obtained by the sperm sperm measurement value; according to the two delay sperm measured values of the 1st, the 2nd, the 3rd, and the 2nd Road, the delay estimation method can be used to calculate the direction of the pulse signal.Getting rid of the spacing must be less than half -wavelength, and no target cooperation is required. The method is simple and easy to achieve.
Description
technical field [0001] The invention belongs to the technical field of underwater acoustic signal processing, and in particular relates to an active sonar pulse signal direction finding method. Background technique [0002] The monitoring of active sonar signals plays an important role in underwater weapons, underwater acoustic reconnaissance and marine scientific research. Active sonar transmits pulsed signals that cover a wide bandwidth, from a few kHz to hundreds of kHz. In such a wide frequency range, there is no way to use half-wavelength spacing to lay out hydrophone arrays like conventional directional positioning technology. When the array element spacing is greater than half-wavelength, the delay difference between the received signals of the two primitives is often much larger than the signal period. Phase ambiguity will occur, which will result in severe DF ambiguity. SUMMARY OF THE INVENTION [0003] In view of this, the purpose of the present invention is to...
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IPC IPC(8): G01S3/802G01S3/80
CPCG01S3/802G01S3/8006
Inventor 赵冬艳熊童满陈韶华李世智张恒
Owner 中国船舶重工集团有限公司第七一0研究所