摘要
基于正交频分复用(OFDM)技术的雷达波形由于具有结构灵活、频谱利用率高和正交性等优点,逐渐成为雷达领域的研究热点。文中在OFDM混沌二相编码信号的基础上,对OFDM各个子载波内的频率进行调制,设计一种OFDM相位、频率混合编码雷达信号,对该信号的模糊函数和自相关函数进行分析,并深入研究不同混沌映射对信号性能的影响。仿真结果表明:相位、频率混合调制的OFDM编码信号具有更接近于"图钉状"的模糊函数以及良好的自相关性能,由于该信号各载波内频率和相位具有随机性,因此在低截获和抗干扰性能上具有一定的优越性。
Radar waveform signal based on OFDM has gradually become the focus in the field of radar because of its flexible struc- ture, high spectrum efficiency and orthogonally. On the basis of OFDM chaotic binary-phase coded signals, the frequency of each sub-carrier in OFDM is modulated, and a kind of OFDM radar signal form whose phase and frequency are joint coded is designed in this paper. The ambiguity function and auto-correlation of the OFDM radar signal is analyzed, and the influence that different chaotic maps make on signal performance is deeply studied. Simulation results show that the joint OFDM radar signal is mach clos- er to the ＇ pins＇ in ambiguity function and has better auto-correlation performance. Due to the randomness of frequency and phase of each carrier, the radar signal has some advantages in low intercept and anti-jamming performance.
出处
《现代雷达》
CSCD
北大核心
2017年第12期38-41,47,共5页
Modern Radar
基金
航空科学基金资助课题(2014ZC07002
20145596025)
关键词
正交频分复用
混沌编码
模糊函数
orthogonal frequency division multiplexing （ OFDM ）
chaotic coded
ambiguity function
