Design And Implementation Of Broadband Frequency Hopping Transmitter

Spread spectrum communication is important in the modern and future communication. In practical application, in order to increase the ability of anti-disturbance and resistance to the interception in the communication. The hybrid spectrum spread technology is often used. Based on the combination of DS, FH and M-ary spread spectrum, this thesis studies the broadband communication transmitter and some key technologies, and realizes it on the hardware platform. The main contents are as follows:1 This thesis introduces the principles and characteristics of the spread spectrum communication system, the digital intermediate frequency technology and the direct digital frequency synthesis technology(DDS),and studies the principle and basic structure of the broadband FH communication system.2 Based on ARM+FPGA+ASIC, the structure of the system transmitter is presented, which includes the control unit based on the ARM micro controller, the data processing unit based on FPGA, the D/A conversion unit based on DAC5682Z,the power and clock circuit of the system and so on; The structure, the principle and the configuration mode of DAC5682Z are described in detail.3 The implementation scheme of the data processing unit is proposed, and realized by FPGA, including the process of the digital baseband and the digital intermediate frequency, the data interface modules between FPGA and ARM, between FPGA and DAC5682Z and so on. The function tests of each module are finished.4 The thesis puts forward the test scheme of the transmitter, finishes the test of software and hardware, and together with the receiver of the system, finishes the joint test of the whole system,the results meets the requirements of the design.