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Echo sounding technology is widely used in the area of rivers, estuaries , coastal zones and offshore bathymetry, for a chart mapping, hydrographic survey , engineering survey , ship navigation . The first works echo sounder , digital depth sounder system composition and depth calculated discussed ; designed as a core part of the digital echo sounder , the focus of discussion based on the FPGA DSP digital signal processing system ; FPGA-based peripheral interface unit design , including the transceiver board digital interface design , the NMEA0183 data transceiver design , display control interface design , system clock , interface design , the printer interface design , keyboard interface , and system reset control design . DSP-based system software design as a thesis Another main content , the serial data reception and processing , echo sampling data receiving, processing and scrolling display historical data storage and system time to read the contents . Finally completed the debugging of the echo sounder digital systems hardware and software , and the results show that the design is feasible .
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