An all-digital active sonar transmitter and sonar generation method

Abstract

The invention discloses an all-digital active sonar transmitter, including a control center and a plurality of power amplification assemblies. The control center integrates a signal generator, a D-class power amplification controller and a serial communication module, and has functions of waveform storage, transmitting power control, transmitting beam formation, PWM waveform generation and dead zone control. Each power amplification assembly comprises a drive circuit, an H bridge, a low pass filter and a matching network. The all-digital active sonar transmitter utilizes a digital delay line to realize transmitting beam formation, data are compared with a counter after offset, a PWM waveform is generated, and dead zone time of the PWM waveform can be adjusted precisely on line in real time. According to the all-digital active sonar transmitter provided by the invention, complexity and debugging difficulty of a transmitter structure are simplified, and anti-interference performance and reliability of a system are improved.

Description

technical field [0001] The invention relates to the field of underwater acoustic engineering, in particular to an all-digital active sonar transmitter. Background technique [0002] The transmitter is an important part of active detection sonar or underwater communication equipment, which consists of a signal generator, a power amplifier, a matching network and a transmitting transducer. In order to achieve the expected sound source level and emission directivity, dozens or even hundreds of transducers form an array and phase-controlled emission. The electronic part of the phased array transmitter includes multiple parallel power amplifiers, the equipment is huge and complex, and the system reliability is limited. [0003] The signal generator is generally located in the signal processing cabinet, which is convenient for sending and receiving synchronization with the receiver, and communicating with the sonar control computer. According to the working parameters issued by ...

AI Technical Summary

Problems solved by technology

[0004] In the noisy working environment of the ship, the signal transmission process is susceptible to noise interference; in order to achieve the expected transmission power or beam shape, the number of analog signals is as high as dozens or even hundreds of channels, and crosstalk between analog signals and analog-to-digital signals is easy to form. Seriously affect the signal quality

In addition, bulky cable connections are required between the signal processing cabinet and the power amplifier cabinet, and it is not easy to install and debug in a narrow cabin

In the power amplifier cabinet, the analog signal is compared with the comparator to generate a PWM signal to drive the class D power amplifier. This process is also easy to introduce noise interference and reduce the performance and reliability of the system.

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