Active sonar response method and transponder

Abstract

The invention provides an active sonar response method and a transponder, and the method comprises the steps: firstly, searching a sonar to emit a direct wave, measuring the frequency spectrum of a direct pulse signal, accurately determining the center frequency and bandwidth of an FIR band-pass filter according to the frequency spectrum, and accurately measuring the width of the front and rear edges of a pulse envelope through differential, generating a simulated target echo signal that is not affected by multipath and reverberation extension from a transponder internal signal. The beneficial effects of the invention are that the method solves a problem that the high-power transmission of conventional response output signals of a shallow sea marine test ship shell sonar cannot meet the calibration of the sonar performance detection precision; the flexibility of generating FPGA programmable signals in the transponder is utilized, the frequency, the pulse width and the bandwidth can be set at will, and the marine test efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of hull sonar overall and circuit design, and mainly relates to an active sonar response method and a responder. Background technique [0002] Due to the limitations of the test target and test environment, large-scale hull sonars generally need to use transponders to simulate target echoes to achieve static performance tests such as sonar direction finding, ranging, speed measuring accuracy, and measuring range when carrying out qualification tests. Conventional transponders generally receive active sonar direct waves through hydrophones, and after amplification and filtering, the received signals are sent by the transmitting transducer to realize the response. However, when receiving direct waves, there are also scattering (reverberation) between the seabed and the sea surface, multipath fading, and background noise. Usually, the response transmission signal also contains such reverberation and noise, resulting in a...

AI Technical Summary

Problems solved by technology

However, when receiving direct waves, there are also scattering (reverberation) between the seabed and the sea surface, multipath fading, and background noise. Usually, the response transmission signal also contains such reverberation and noise, resulting in a low signal-to-mixture ratio during sonar static detection. The stability is poor, which affects the calibration of the static performance of the sonar

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