Design And Implementation. Lfmcw Radar Waveform Generator Based On Dds

With the development of modern digital technology and the Very Large ScaleIntegration electrocircuit(VLSI), the method of digital waveform synthesis is widelyused in radar systems now. The waveform generation using digital system is of strictcoherence, repetitiveness, high stability and programmable capability, which can alsoeasily realize the waveform parameter's agility and generate arbitrary complicatedwaveforms in order to meet the urgent requirement for anti-interference and strongsurvival ability of radars under modern electronic warfare environments. The DirectDigital Synthesis (DDS) technology is widely used in civil and military affairs.In the beginning of the paper, introducing the traditional radar waveformgeneration method, setting out the merit of DDS, then analyzing the principle andperformance of DDS method. According to project request, combining the FieldProgrammable Gate Array (FPGA) and DDS technologies, implementing a waveformgenerator of LFMCW radar system which can generate variable waveforms andmodes. At the end of the paper, waveform of output are shown and analyzed. The testresults completely meet the system requirements.The primary work in this dissertation:1. Analyzed the principle and distribution rule of spurious in DDS and some methods to reduce the spurious;2. According to project function request and interface request, accomplished the design of the waveform generator implement scheme;3. Accomplished the VHDL programming and simulation of FPGA control module;4. Based on FPGA and DDS technology, accomplished designing of principle circuit and PCB of the waveform generator, and debug the PCB;5. Measured fully and analyzed effectively CW, LFMCW and simulated echo of object signals, accomplished the debug with the radar system.