Design And Realization Of Synthetic Aperture Sonar Receiver

Acoustic waves are the only effective form of energy that is known to be widely circulated underwater.The use of sound waves on the positioning of underwater targets,detection and communication technology known as sonar technology,has been through more than 100 years of history.Sonar underwater device is now one of the most important and the most widely used devices.Synthetic aperture sonar technology is a new type of underwater acoustic imaging technology with high resolution.When the small aperture array is moving at a uniform speed along the route,the periodic echo signal is transmitted,then received echo signal and coherently accumulated to form a virtual large aperture array,thus realizing high resolution of azimuth.This paper is based on the design of 715 UUV synthetic aperture sonar data acquisition and control transmission system(signal processor),transmitter and receiver electronic circuit machine.This paper mainly completes the design and development of the receiver.In this paper,the design of the system scheme is completed according to the function of the receiver,and the scheme demonstration and device selection are carried out according to the design index of the receiver.The receiver needs to realize the amplification and filtering function of the multi-channel signal received by the transducer,and can realize the variable gain of the DA signal of the signal processing platform.The amplifier circuit of the receiver is realized by a low noise amplifier,a variable gain amplifier and a final amplifier.The filtering function is realized by a pre-matched filter network and a band-pass filter.This paper describes in detail the design and implementation of the receiver hardware circuit.In this paper,the design and implementation of matching filter network are completed by using ADS software.Then,the design and implementation of variable gain amplifier circuit with VCA2616 as the core are introduced.Finally,other circuit design of receiver power supply module is completed.The variable gain amplifier circuit with chip VCA2616 enables up to 74 dB of gain and is able to receive DA signals from the signal processing platform to achieve variable gain control.The matching filter network is designed by using ADS software,and the impedance matching is completed.The maximum transmission of power is realized.The function of filtering the out-of-band signal is performed by matching the filtering network.This paper designs a six-order active band-pass filter to achieve better filtering results.Using the FilterPro software,the design of the active filter is completed by setting the relevant parameters.Finally,the filter is simulated by the PSPICE software,and the filter can filter the out-of-band noise better and realize the filter of the design indicators.This essay is based on the receiver circuit schematic diagram to complete the PCB design and production,and in Fuyang water sound measurement station SAS machine debugging,verify the receiver noise,multi-channel signal consistency and other indicators have reached the desired target,can be used More complex underwater detection environment.Finally,summarize the main research results of the full text,find out where the receiver needs to be improved,plan the next step.