| The DS/FH communication system is a new kind of spread spectrum technology that combined with two kinds widely used technology DS&FH.It has advantages of DS and FH and overcomes the shortage of single spread spectrum.It is favorable to improve performance of the DS/FH system. Whether for military or civilian communications, reflects high application value. As communications technology development, FH signal generator are indispensable,it is not only as communication equipment but also as jump spread spectrum communication etecting equipment. In military airborne field, it is more necessary to use analog standard signal source to detect performance of equipment and standards calibration. Therefore,it is necessary to make high quality, competitive price and carry convenience FH generator,it not only improve maintenance performance of new aircraft equipment but also provide faster, more effective,more precise and more accurate support capacity and means for new aeroplane maintenance.This paper deeply studied based on FPGA DS/FH frequdency source hardware and software.Use auxiliary design tools to analysis each module performance of system, on base of that the optimal integral scheme of signal generator is presented.Use software and hardware to realize the design.DS/FH signal sent part is mainly designed, from signals received, baseband yards processing, intermediate frequency modulation to digital analog conversion. The software is designed to aim for flexible configuration, maintainability stronger and better versatility. The whole circuit is achieved simply and it has strong practicability. Overall the hardware circuit use FPGA as the core components, cooperate to high performance, high stability AD9951 and high-speed D/A converters. The designed DS/FH signal genera has high integrity, stable signal and software upgrade advantage.It can correctly realize spread spectrum modulation,π/4 DQPSK carrier modulation,FH modulation and provides based.for high comprehensive synthetic system. |
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