Orthogonal wideband hybrid-coding radar waveforms design

• Published in: Signal, image and video processing Vol. 11; no. 1; pp. 103 - 111
• Main Authors: Wang, Libao, Gao, Fei, Xu, Jia, Wang, Dangwei, He, Mi, Yuan, Junquan
• Format: Journal Article
• Language: English
• Published: London Springer London 2017; Springer Nature B.V
• Subjects: Broadband; Chirp signals; Computer Imaging; Computer Science; Correlation; Genetic algorithms; Image Processing and Computer Vision; Multimedia Information Systems; Original Paper; Pattern Recognition and Graphics; Properties (attributes); Signal,Image and Speech Processing; Vision; Waveforms; Discrete frequency coding (DFC); Orthogonal waveform; Polyphase coding (PPC); Genetic algorithm; Waveform design
• ISSN: 1863-1703; 1863-1711
• DOI: 10.1007/s11760-016-0905-6

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.