A Novel Wideband Radar Signal Generation Technique Based on Multiple-channel DDS in Parallel
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Abstract:
A wideband signal generating technique based on multiple-channel direct digital synthesis (DDS) in parallel is proposed for wideband radar signal generation. Using field programmable gate array chips, digital chirp signals are generated by the multiple-channel DDS architecture in each channel with variable phase difference at intermediate frequency. In addition, phase compensation is applied to multiple-channel signal before they are synthesized into a wideband signal at output by the high鄄speed digital/analog converter. Simulation and experimental results show that using the proposed technique, wideband signals can be generated at intermediate frequency in large instantaneous bandwidth at the advantages of easy implementation, high resolution in frequency and high-speed frequency conversion.
