Algorithm Simulation And Programma Design On Acoustic Communication Buoy

The national security and economic development of a country is relative to its development of the marine technology,developing underwater acoustic career appears such critical to advance the marine technology,also the acoustic buoy plays a decisive role in the acoustic area,it's an important science method.So the development of buoy becomes one of the most important underwater acoustic directions.This paper has studied and simulated some theories of the direct sequence spread spectrum communication,also designed the transmit communication software combined with the beidou receiver based on the distributed underwater positioning system and its kernel hardware is based on ARM S3C2440.The buoy can transmit the information that demodulated from the spread spectrum signal received underwater through the beidou receiver to the shore-based beidou terminal at the real-time.The shore-based beidou terminal is connected to the computer,then in the personal computer side,the upper software draw the coordinate point according to the position values received;at the same time,the buoy can also receive the information from the shore-based beidou terminal at the real-time and modulate it to the spread spectrum signal,then transmit it through the transducer underwater.Firstly,the main work finished in this paper includes the relative research of the direct sequence spread spectrum communication,also simulated and analyzed the communication process of the DSSS signal through the D type power amplifier and the long distance DSSS communication in the shallow sea surroundings.Then we used embedded Visual C++ realize the control software of the audio card,and design the control program of the beidou receiver and transmit communication,also amend the serial port driver in the embedded system Windows CE 4.2 aim at the system need.In the personal computer side we used Visual C++6.0 design the program that can draw the coordinate point at the real-time.At last,electronic combine adjusting ? the simulated pool experiment and the communication and transmittal test in the sea were made,the results of the three period experiments indicate the buoy system can steadily and well run,all the designs achieve the requirement.