Design and realization of wideband radar signal source based on AD9858
Duan Long-hui · Modern Electronics Technique · 2013
A design scheme of a wideband radar signal source is given in the paper.It is composed of a baseband signal source and frequency multiplier chain.A linear FM signal is generated,whose center frequency is 1 GHz and bandwidth is 800 MHz.The baseband signal source selects high-performance digital frequency synthesizer chip AD9858 produced by AD,and DDS control word is loaded by FPGA to generate(200±50)MHz baseband signal.Multiplier chain is used to carry out up-conversion and frequency doubling of the baseband signal so as to output wideband radar signal whose bandwidth is 1 GHz±400 MHz.The wideband radar signals are tested through the oscilloscope and spectrum analyzer,and meet the design requirements.