Interpulse-frequency-agile and intrapulse-phase-coded waveform optimisation for extend-range correlation sidelobe suppression

作     者：Mao, Zhineng Wei, Yinsheng 

作者机构：Harbin Inst Technol Dept Elect Engn Xidazhi St 92 Harbin Heilongjiang Peoples R China 

出 版 物：《IET RADAR SONAR AND NAVIGATION》 (IET雷达、声纳与导航)

年 卷 期：2017年第11卷第10期

页      面：1530-1539页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 

主　　题：phase coding modulation coding frequency modulation correlation methods optimisation frequency hop communication interpulse-frequency-agile waveform optimisation intrapulse-phase-coded waveform optimisation extend-range correlation sidelobe suppression stepped-frequency waveform SF waveform grating lobes phase-coded modulation PC modulation linear frequency modulation PC frequency-hopping PCFH waveform nonlinear frequency evolution optimal frequency order polyphase code 

摘      要：Conventional stepped-frequency (SF) waveform utilises the frequency step between pulses to span a wide bandwidth. However, the frequency step size is limited by the width of the pulse to prevent the grating lobes, and the first lobe is about -13dB due to the uniformly sampling in frequency. Modulating the pulses [e.g. phase-coded (PC) modulation or linear frequency modulation] can increase the frequency step size and improve the performance of the sidelobes, but the sidelobes of the modulated SF waveform are still not the best. In this study, a PC frequency-hopping (PCFH) waveform to achieve optimal extend-range correlation sidelobes is presented. The presented waveform applies non-linear frequency evolution, optimal frequency order and different polyphase code to each pulse. In comparison to the SF waveform, the PCFH waveform has much higher degrees of freedom for suppressing extend-range correlation sidelobes. The authors propose a design scheme, which sequentially optimises the interpulse frequency, the FH order and the intrapulse-polyphase code to achieve the optimal extended-range correlation sidelobes. Simulation results validate the performance of the optimised waveform and the feasibility of the involved design method.