Software Design Of Distributed Signal Acquisition Array Node

At present,distributed signal acquisition array technology as the research focus of signal processing technology is widely used in marine oil and gas exploration,sonar exploration and other important areas.It is of great significance to develop a distributed signal acquisition array system with independent intellectual property rights.The node software system researched in this paper is an important part of the distributed signal acquisition array system,and has good engineering practical value.This thesis developed a distributed signal acquisition array node system.In order to complete the targets of the system,a self-defined communication protocol was designed.Based on this protocol,develops a software system of nodes to realize synchronous signal acquisition,stable and high-speed long-distance transmission and real-time control of nodes system by computer.In order to ensure the reliability of custom communication protocols,this paper combines the information redundancy-based CRC error checking mechanism,the time redundancy-based data redundancy mechanism and the hybrid redundancy-based mechanism of link status detection.And then,this paper develops a communication system including communication management module,acquisition module,485 module,data processing module,command processing module,storage module and acquisition and transmission driver module based on the self-defined communication protocol.This software system realizes the signal acquisition and transmission the real-time response to the command of host computer.In addition,This thesis designs the high-speed transmission interface between the processor and FPGAby combining PCIe technology,DMA technology and Linux programming technology,realizing the high-speed data transmission between processor and FPGA.The test results show that the software of distributed signal acquisition array node system developed in this thesis realizes the real-time response to the compute system and the stable high-speed data acquisition and transmission,and meets the system design requirements.