The Improved Design And Implementation Of Digital Signal Processing Hardware Of DVL

Doppler Velocity log is a kind of high-precision equipment which is widely used in marine navigating and velocity measuring. The measurement of ship's speed mainly depends on measuring convection speed and bottom speed, while Doppler Velocity log has a great advantage in measuring both the two kinds of speeds, the phase-array doppler log can perform sound velocity compensation automatically according to the theory.The thesis takes the principle of doppler velocity as theoretical basis, completes the design improvement of Doppler Velocity log's digital signal processing hardware according to the practical application demands. In order to meet the user's requirements,a matching data acquisition and storage system is designed to collect and store the bottom-reflection echo signals.The hardware selects the fixed point?low power consumption DSP from TI company as the central processor. Three pieces of DSP are used in digital signal processing hardware, they work in the master-slave mode,complete system control?signal acquisition?frequency offset calculating and update online by doing their own duties as well as cooperating harmonically.One piece. DSP is also used as a core component in the data acquisition and storage circuit,which completes the acquisition and storage of target echo signals to CF Card with the help of peripheral equipment.System software mainly bases on the hardware. The software development mainly includes the design of online updating program?data acquisition and storage program?logic control program and the display interface of online update. The programs are written by hybrid programming with C language and assemble language, which makes the programs run more efficiently. The modular design of programs makes the work modes more diverse, and also makes the program more portable and readable.Through the system testing in the laboratory, the feasibility and compatibility of the hardware equipment and software program are proved, the testing result shows that the hardware system designed can meet the design requirement precisely, achieve the budget targets.