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| Design and Analysis of Inter-pulse Costas Frequency Hopping and Intra-pulse Multi-carrier Chaotic Phase Coded Radar Signal |
| Huang Qiong-dan① Li Yong① Lu Guang-yue② |
①(School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China)
②(School of Telecommunication and Information Engineering, Xi’an University of Post & Telecommunications, Xi’an 710112, China) |
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Abstract Through taking the Multi-Carrier Phase Coded (MCPC) signal as the subpulse, and replacing the linear frequency step with the Costas frequency hopping, a new Inter-Pulse Costas frequency hopping and intra-pulse Multi-Carrier Chaotic Phase Coded (denoted by IPC-MCCPC) radar signal is designed on the basis of stepped-frequency signal. The ambiguity function and autocorrelation performance of the designed signal are studied. Simulation results show that the designed signal carries forward the advantage that the stepped-frequency signal achieves a larger operating bandwidth by instantaneous bandwidth synthesis, and overcomes the defect of range-velocity coupling caused by frequency-stepped. The interpulse’s multi-carrier characteristic can decrease the frequency stepped pulse number under the condition of keeping the total bandwidth as same as the stepped-frequency signal, thus increases the data rate of signal processing. The designed signal has stronger secrecy due to the introduction of chaotic phase modulation. The ambiguity function of designed signal has lower periodic side lobe because the Costas frequency hopping. Besides that, the designed signal has flexible structure, numerous parameters and complex modulation mode makes it more difficult to be identified by reconnaissance receivers, so the anti-intercept ability of radar system is greatly improved.
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Received: 19 May 2014
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Corresponding Authors:
Li Yong
E-mail: ruikel@nwpu.edu.cn
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