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A Background Equalization Method for Reducing Low-Frequency Noise Level

A technology of low-frequency noise and equalization method, applied in radio wave measurement systems, instruments, etc., can solve problems such as inability to suppress low-frequency noise well, effect discount, etc., to reduce the degree of manual intervention, stable method performance, and effective detection and analysis. Effect

Active Publication Date: 2022-05-13
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, although these three methods can effectively reduce the non-uniform interference background in the time-frequency diagram, none of them can well suppress the low-frequency noise generated by the sonar receiving equipment; in addition, the performance of the OTA method and the S3PM method is more Rely on empirical parameters manually set, if the empirical parameters are not set properly, the effect of these two methods will be greatly reduced

Method used

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  • A Background Equalization Method for Reducing Low-Frequency Noise Level
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  • A Background Equalization Method for Reducing Low-Frequency Noise Level

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specific Embodiment approach

[0030] figure 1 It is the realization flowchart of the present invention. The specific implementation method comprises the following steps:

[0031] The first step is to take out the data row vector corresponding to a certain moment t in the time-frequency diagram (t=1,2,...,T, T represents the number of pixels in the time-frequency diagram in the time dimension) (if the corresponding data is a column vector is transposed as a row vector).

[0032] In the second step, the search gets all peaks and all valleys in the data row vector.

[0033] The third step, for a certain peak, search to find its left and right adjacent valleys that are the second closest to it, and then intercept the data between these two valleys, denoted as x(1),x(2),.. .,x(M), a total of M points, and record the largest and smallest valleys in this data as x min1 and x min2 , with the largest peak at x max .

[0034] If only 1 or 0 valleys are found on the left side of the peak, then x(1) takes the f...

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Abstract

The invention belongs to the technical field of sonar signal display, and relates to a background equalization method for reducing low-frequency noise levels. The method designs a new background equalization mode, searches the peak value and the valley value in the time-frequency map image in sections and compares them with the The preset threshold is compared, and then the time-frequency map after background equalization is output through point-by-point minimum processing. The beneficial results of the present invention are: 1. The proposed method of the present invention does not need to manually set empirical parameters; The points have a lower average noise level, especially in the low frequency band, the noise suppression effect is better, so that the line spectrum in the time-frequency diagram can be detected and analyzed more effectively.

Description

technical field [0001] The invention belongs to the technical field of sonar signal display and relates to a background equalization method for reducing low-frequency noise level. Background technique [0002] An important method for sonar equipment to detect underwater targets is to use the radiation noise of underwater submarines, torpedoes and other targets as the received signal, and then analyze each frequency component in the time-frequency image (hereinafter referred to as the time-frequency image) of the received signal through detection and analysis. The "line spectrum" on the target (that is, the bright line on the frequency component that appears within a certain period of time, indicating that the frequency component has a relatively high amplitude during this period of time) is used to judge the presence and type of the target. Generally speaking, the line spectrum components of underwater target radiated noise are mainly concentrated in the lower frequency band...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/537
CPCG01S7/537
Inventor 朱家华张兵兵彭承彦徐国军吴艳群张卫华郭微胡正良朱敏
Owner NAT UNIV OF DEFENSE TECH
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