The Design Of Multi-Channel Massive Data Recording System

As an auxiliary device of underwater acoustic engineering, data recording system canrecord the original data and complete the post-processing of the experimental results. With thedevelopment of the underwater acoustic technique, the requirement of data recording systemis also increasing rapidly.Besides sampling rate, channel number and data storage capacity,data recording system is also supposed to satisfy some other indicators like multi operatingforms and data storage methods. A multi-channel and massive data recording system isdesigned and implemented which can record underwater acoustic signal in real time,athigh-speed and with large capacity storage.The hardware and software design of the multi-channel and massive data recordingsystem is completed, and the specific contents are as follows:Hardware design: The hardware structure of the multi-channel and massive datarecording system, which is based on the OMAP-L137platform, is designed and implementedincluding power supply circuit, analog to digital conversion circuit, FPGA peripheral circuitand OMAP-L137peripheral interface circuit. Depending on the sampling rate, two AD chipsare used in the analog to digital conversion circuit. The AD chips are controlled by the FPGAcircuit, and the caching and transmission of the multi-channel data is also implemented byFPGA. In the OMAP-L137peripheral interface circuit, the AD chips are configured throughthe I2C interface and the data transmission with FPGA is completed through McASP interface.Many power chips are used in the power supply circuit to supply the power for AD chips,OMAP-L137and FPGA.Software design: The DSP program is designed to implement the AD chips settings andthe data acquisition cache. The FPGA program is designed to implement three functionsincluding the control of the AD chips, the generation of synchronizing pulse and themulti-channel storage at real time. The application and driver programs based on the Linuxsystem are designed to implement two functions, communicating with DSP and recording thedata to USB device through the USB interface.Finally, the rationality and feasibility of the design is validated through the simulationand testing of the system. The thesis is summarized and the improving measures are preparedfor the further study of the data recording system.