Recognition method of strong pulse signal based on slope and amplitude difference value threshold

Abstract

The invention discloses a recognition method of a strong pulse signal based on a slope and amplitude difference value threshold. The recognition method comprises the following steps: obtaining an acoustic signal through an acoustic sensor and converting the acoustic signal into an electrical signal to be sent to a preprocessing circuit so as to be amplified, filtered, detected, sampled and smoothed, finally obtaining a smooth curve; obtaining the slope between various points and adjacent points which form the curve by aiming at the smooth curve, and calculating slope difference values of the adjacent points, selecting the point of which the difference value of the slope with that of adjacent sampling points on two sides is greater than a preset threshold as a mutation point; taking the slope between the mutation point and the former adjacent sampling point of the mutation point as an initial value, calculating the slope difference value between the slope of the mutation point on the smooth curve and the follow-up point of the mutation point and the initial value, and an amplitude difference value between the mutation point and the follow-up point, if the amplitude difference value and the slope difference value of the follow-up points and the mutation points of set number are both greater than a set threshold value, judging the signal to be the strong pulse signal. The recognition method of the strong pulse signal based on the slope and amplitude difference value threshold disclosed by the invention can recognize the strong pulse signal.

Description

technical field [0001] The invention belongs to the technical field of signal identification, and in particular relates to a strong pulse signal identification method based on slope and amplitude difference thresholds. Background technique [0002] The underwater detection system relies on the sensor system to capture the target signal, then process the signal, and then issue an action command. When the detection system works underwater, strong interference pulse signals are often generated at the front end of the analog circuit of the receiving sensor due to explosions and impacts. This interference has the characteristics of high sound source level and wide frequency spectrum. At this time, time domain and frequency domain filtering It is difficult to eliminate such interfering signals. Strong pulse signals make it difficult for the underwater detection system to work normally. Therefore, fast and effective detection and judgment of strong pulses is a prerequisite for the...

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Problems solved by technology

[0003] In view of the fact that the interference pulse signal has a large amplitude change in a short period of time, the previous design used to calculate and judge the amplitude within a time window with a certain width. The selection of the time window width is very important. If the width is too small, the amplitude If the value does not change much, false positives will occur; if the width is too wide, there will be a time lag, which does not meet the real-time requirements of the underwater detection system

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