Orthogonal wideband hybrid-coding radar waveforms design
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To obtain wideband orthogonal waveforms of radar systems with high-range resolution and good correlation properties, this paper proposes two types of orthogonal wideband hybrid-coding waveforms, polyphase discrete frequency (PDF) waveforms and polyphase signed-chirp (PSC) waveforms. Using an intra-pulse hybrid modulation, high-range resolution can be obtained, and good correlation properties between different waveforms are easier to optimize within a larger optimization space. Specifically, good correlation properties of the PDF waveforms are indeed easier to achieve without a loss of range resolution, as occurs with a discrete frequency coding waveform. Compared with polyphase coding waveforms, the signal bandwidth of each PSC waveform is twice as large as that of sub-pulse chirp signals, and superior correlation properties are obtained. Finally, various designed waveforms optimized by the genetic algorithm are provided to demonstrate the effectiveness of these proposed wideband hybrid-coding waveforms.
KeywordsOrthogonal waveform Waveform design Genetic algorithm Polyphase coding (PPC) Discrete frequency coding (DFC)
The authors would like to thank the department of automatic control and systems engineering of the University of Sheffield, UK, who developed the genetic algorithm toolbox that is available at the homepage of http://www.shef.ac.uk/acse/research/ecrg/gat.html. Besides, we also thank the anonymous reviewers for their comments, which are crucial in improving the quality of this paper.
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