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Sonar waveform design method capable of controlling ambiguity function

A waveform design and ambiguity technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of difficult engineering application, large amount of calculation, poor real-time performance, etc., and achieve fast running speed, strong real-time performance, and low computational complexity. Effect

Active Publication Date: 2021-08-27
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

[0005] Aiming at the shortcomings of the existing methods, the present invention discloses a sonar waveform design method that can control the ambiguity function, and mainly solves the problems that the existing waveform design method has a large amount of calculation, poor real-time performance, and difficult engineering application

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  • Sonar waveform design method capable of controlling ambiguity function
  • Sonar waveform design method capable of controlling ambiguity function
  • Sonar waveform design method capable of controlling ambiguity function

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Embodiment

[0090] In order to verify the effectiveness of the method of the present invention, the following will be described in detail in conjunction with specific examples and accompanying drawings.

[0091] The simulation condition is to design a waveform with a length of N=28, which is required to have a symbol length of [5,...,10] in the delay region of the ambiguity function, and a normalized Doppler region of [3,..., The expected ambiguity function in 7] / 28 is 0, and the convergence condition of the algorithm is that the second norm of the waveform variation in two iterations is less than 5e-4. The detection waveform that satisfies the conditions can be obtained through the calculation iteration of formulas (1)-(28). The variation figure of the objective function value of the inventive method with the number of iterations and running time is as follows figure 2 and image 3 shown. The ambiguity function of the designed waveform is as Figure 4 Shown in the box is the specifi...

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Abstract

The invention discloses a sonar waveform design method capable of controlling an ambiguity function, belongs to the technical field of waveform design, relates to a sonar waveform design method capable of controlling an ambiguity function in any time delay-Doppler domain, and mainly solves the problems that an existing waveform design method is large in calculation amount and poor in real-time performance. The method comprises the following steps of: converting an original quartic optimization problem which is difficult to solve into a plurality of primary optimization problems which are easy to solve by applying a maximum and minimum method, and obtaining a detection waveform which meets conditions through iteration. The method has the capability of controlling the ambiguity function of the sonar detection waveform in any time delay-Doppler domain, and has the advantages of high operation speed and good real-time performance.

Description

technical field [0001] The invention belongs to the technical field of waveform design, and in particular relates to a sonar waveform design method capable of controlling the ambiguity function in any "time delay-Doppler" domain. Background technique [0002] Sonar is an electronic device for underwater target detection. figure 1 A schematic diagram of its working principle. The working principle of sonar is to transmit acoustic signals to the target, and then process the reflected acoustic signals to extract information such as the relative distance and relative speed between the target and the platform. Therefore, the nature of the detected waveform is a decisive factor in determining the performance of the sonar. The difficulty of the target detection system is to detect weak targets and obtain their accurate time delay and Doppler information. Improving the ability to distinguish weak targets in any "delay-Doppler" domain is fundamental to obtain accurate information o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
CPCG01S7/52
Inventor 王惠刚王鹤霖刘志宏练斌张华霞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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