Active sonar target simulator signal processing method

Abstract

The invention relates to an active sonar target simulator signal processing method which comprises the following steps: an underwater acoustic energy transducer picks up audio information in water and converts the audio information into an electrical signal; an analog-to-digital converter converts the analog electrical signal into a discrete digital signal; the discrete digital signal is transmitted to a signal processing chip and is processed by an SPI serial port; a double-buffer area is arranged in a storage area in the signal processing chip, and read data are placed into the double-buffer area in a circular way; the digital signal in the double-buffer area is read according to a fixed time interval and converted into the analog electrical signal; and the underwater acoustic energy transducer is promoted to convert the signal into a voice signal by filtering ultraharmonics and amplifying by a power amplification circuit. The invention can simulate the acoustic reflection of a submarine and recognize signal forms of a single frequency signal and a frequency-modulated signal, signal time length and signal strength according to a received active sonar signal, transmit a signal in the same form after increasing a certain reflection strength and also increase the Doppler frequency shift for simulating the relative motion between the submarine and a sonar.

Description

technical field [0001] The invention belongs to the field of sonar signal processing and is used for an ocean water acoustic response device, and mainly relates to a signal processing method of an active sonar target simulator. Background technique [0002] The original purpose of the development of the invention is as a target simulation means of active sonar, simulating the acoustic reflection of a submarine to evaluate the performance of active sonar. Sonar equipment is divided into active sonar and passive sonar. Passive sonar only monitors the sound in the ocean, and active sonar emits pulsed sound signals, and then waits for the echo of the monitoring signal. The acoustic signal propagates in sea water, and it will be reflected when encountering fish schools, submarines, and ships. The invention simulates the reflection, can identify the sonar signal and generate a corresponding response, and is used to replace the real submarine to evaluate the performance of the act...

AI Technical Summary

Problems solved by technology

The former requires the intervention of the user and is set and fixed in advance, so it is inconvenient to use and even cannot be used under the condition of tight test time; the signal type of the latter response is consistent, but it has two other disadvantages : The first is that the signal it responds to also includes surrounding noise, which is a disadvantage; the second is that it cannot add Doppler frequency shift or other signal characteristics

[0004] The problem with some transponders is that the response time is uncertain, and the time from the active sonar transmission signal to the response signal is uncertain, so the response time cannot be used to calculate the distance

Images