Active continuous wave sonar detection system and coded continuous wave signal design method

Abstract

The invention provides a continuous wave sonar detection system and a signal encoding method. The sea test carried out by using the system has obtained a larger processing gain and a shorter target information refresh cycle than the traditional pulse signal. The system includes a display console, Signal generation module, beamforming module, D / A conversion module, power amplifier, transmitting matrix, receiving matrix, conditioning acquisition and transmission module, reverberation suppression module, beamforming module, continuous wave signal processing module, target parameter estimation module.

Description

technical field [0001] The invention relates to the technical field of underwater active sonar, in particular to a waveform design method based on a shore-based active sonar anti-submarine system using coded continuous wave signals. Background technique [0002] The current active sonar, whether it is the active sonar on the hull, the active and passive combined sonar or the sonar placed by the helicopter, the signal transmission method is pulsed, that is, the signal is transmitted for a certain length of time, and then the signal is transmitted to the target. The echo signal is processed to obtain information such as the target's azimuth, distance, speed, etc. During the process of echo signal processing, the transmission of active signals is stopped. The advantage of using this active sonar detection method is that the working method is simple and the signal processing algorithm is relatively simple, but there are also some obvious disadvantages: due to the pulse working m...

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Problems solved by technology

The advantage of using this active sonar detection method is that the working method is simple and the signal processing algorithm is relatively simple, but there are also some obvious disadvantages: due to the pulse working method, the tracking of the target is not continuous, and as the distance increases, The target update period increases to more than ten seconds or even dozens of seconds, which can easily cause target loss and false alarms; sudden interference is likely to cause false alarms; time gain and blind area are a pair of contradictions

In public reports, two companies in the United States, Elaine and American Signal Systems, have carried out research work in this area, but neither mentioned specific technical details and applications, and there is no public report on whether the research and development is successful. There are very few technical documents and materials published by continuous wave active sonar

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