Design Of High Speed Acquisition And Processing Board Of Multi-beam Synthetic Aperture Sonar

Imaging sonar is an important equipment of exploring the ocean. And Synthetic aperture sonar is one kind of imaging sonars, whose technology is one of the most complex. Based on the research of the multi-beam synthetic aperture sonar,this paper makes a research on the software and hardware of the multi beam synthetic aperture sonar platform, and the realization in engineering.This paper introduces the operational principle and development situation of SAS system, analyzes the characteristics and functional requirement of SAS data acquisition platform, chooses the best system solution. And it carries out the specific work in the following three aspects.Firstly, the paper introduces in detail all parts of the hardware platform, including the FPGA module, data acquisition module, Gigabit Ethernet module, DAC module and system power supply module. The FPGA module is the acquisition and control center of the collection system. Acquisition module mainly collect the receiving data of 128 channel and the temperature information of the electronic cabin. Gigabit Ethernet module realizes the data transfer between the system and PC. System power supply module can output 5 kinds of power, and each type of power supply adopts independent power supply, which guarantees the stability of the hardware circuit.Secondly, after realizing the hardware platform, it constructs the SOPC software platform on it, mainly including three parts:NIOS minimum system, high speed data transmission module and data transmission module. The high speed data transmission module transfers the data collected by AD to DDR2 for cache memory. The data transmission module sends the data through the Gigabit Ethernet to PC. Then,the system software development is accomplished. It realizes system initialization, system work flow control and the UDP packet and unpack function and so on.Finally, debugging and verifying each function module of the system. Through the test of system integration, we can make a conclusion that the design of software and hardware of this platform achieves the expected design requirements.