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Method for sonar array signal simulation by utilizing interpolation filter

An interpolation filter and signal simulation technology, which is applied in the field of signal simulation, can solve problems such as impossibility of real-time realization, large amount of calculation, poor precision, etc., and achieve the effects of easy real-time realization, increased calculation speed, and improved calculation speed

Inactive Publication Date: 2007-08-29
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing sonar array signal simulation technology, such as the poor precision or the large amount of calculation that cannot be realized in real time, and provide a method for using an interpolation filter to perform sonar array signal simulation

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  • Method for sonar array signal simulation by utilizing interpolation filter

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] On the DSP (ADSP 21060) platform, the real-time simulation system of one-array primitive signal is realized. Among them, the system parameters are: the number of line array elements N=64, the interval of line array elements d=1.5m, the signal incident angle θ=30°, the system sampling frequency Fs=25KHz, the sampling period Ts=1 / Fs=4× 10 -5 S, the maximum time delay K=1650 that the system can handle. The incident signal is sin(2*π*f*t), the angle θ between the incident signal and the base array is 30°, that is, the own ship’s angle for obtaining the target signal, and the speed of the signal in water is c=1500m / s. As shown in Figure 1.

[0030] The present embodiment carries out following steps:

[0031] (1) Design interpolation filter:

[0032] ■The sampling frequency of the system is 25kHz, that is, the sampling period T ...

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Abstract

This invention discloses an emulation method for sonar array signals by using of slip-in filter. It is to create an interpolating FIR filter parameter file by using filter to design tools and rearrange the file; and to divide the time-delay of each elements in base array into rough delay and precise delay; to do rough delay treatment to the incidence signals of data memory according to rough delay control quantity; to use the interpolating FIR filter parameter file after rearranged to filter the data through tough delay treatment. The filtering result is the emulation signal. This invention can ensure both high delay accuracy and large delay range; it increases the calculation speed and spares the hardware memory space and can be easily realized on DSP platform.

Description

technical field [0001] The invention relates to a signal simulation technology, more specifically, the invention relates to a method for using an interpolation filter to simulate a sonar matrix signal. Background technique [0002] In the field of underwater acoustic signal processing, the simulation of sonar array signals is also called anti-beamforming, which generates signals received or transmitted by each element through directivity in a predetermined direction. The general method is to obtain the primitive simulation signal corresponding to a certain delay by calculating the delay of each primitive. [0003] In the article "Up-sampling rate processing in digital sonar" in the first issue of volume 15 of Acoustica Sinica in January 1990, a method of zero-filling the low-sampling rate signal and convolution with the window function was proposed to obtain a new The method of high sampling rate signal is to insert zero value between the sampling points of low sampling rat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/52G01S15/00
Inventor 李蕾吴永清蔡惠智
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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