脉间Costas跳频脉内多载波混沌相位编码雷达信号设计与分析

黄琼丹; 李勇; 卢光跃

doi:10.11999/JEIT140653

脉间Costas跳频脉内多载波混沌相位编码雷达信号设计与分析

doi: 10.11999/JEIT140653

1.
(西北工业大学电子信息学院西安 710072)
3.
(西安邮电大学通信与信息工程学院西安 710112)

基金项目:

航空科学基金(20112053018)资助课题

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出版历程
- 收稿日期: 2014-05-19
- 修回日期: 2015-01-29
- 刊出日期: 2015-06-19

Design and Analysis of Inter-pulse Costas Frequency Hopping and Intra-pulse Multi-carrier Chaotic Phase Coded Radar Signal

1.
(School of Electronics and Information, Northwestern Polytechnical University, Xi&rsquo
2.
(School of Electronics and Information, Northwestern Polytechnical University, Xi&rsquo
3.
(School of Telecommunication and Information Engineering, Xi&rsquo

摘要

摘要: 该文在步进频信号的基础上，把基于混沌调制的多载波相位编码(Multi-Carrier Phase Coded, MCPC)信号作为子脉冲，用Costas跳频代替频率的线性步进，设计出脉间Costas跳频脉内多载波混沌相位编码(Inter-Pulse Costas frequency hopping and intra-pulse Multi-Carrier Chaotic Phase Coded, IPC-MCCPC)雷达信号，并对其模糊函数及自相关性能进行了研究。仿真分析表明，该文设计的信号继承了步进频信号用较小的瞬时带宽合成较大的工作带宽的优点，同时有效克服了步进频信号存在的距离-速度耦合的缺点。脉内多载波特性使得这种信号在保持总带宽和步进频信号相等的条件下减少跳频阶数，从而提高信号处理的数据率；混沌调相的引入使得这种信号具有更强的保密性；脉间频率的随机跳变使其模糊函数具有更低的周期性旁瓣。这种信号众多的参数、灵活的结构及较大的调制复杂度，增加了侦察接收机匹配和识别的难度，从而提高雷达的反截获性能。
- 雷达 /
- 混沌 /
- Costas /
- 多载波相位编码 /
- 模糊函数
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 interpulses 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.
- Radar /
- Chaotic /
- Costas /
- Multi-Carrier Phase Coded (MCPC) /
- Ambiguity function

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