一种新的OFDM相位编码频率步进雷达信号及其特性
doi: 10.3724/SP.J.1146.2010.00532
A New OFDM Phase-coded Stepped-frequency Radar Signal and Its Characteristic
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摘要: OFDM相位编码脉冲雷达体制具有很多良好的性质，但工程实现上存在着一些的技术挑战，其中之一就是瞬时带宽等于信号的总带宽，当信号带宽很大时对接收设备提出了很高的要求。针对这个问题，该文提出了一种OFDM相位编码频率步进的新雷达信号，其核心思想是通过载频的频率步进，利用多个带宽较小的OFDM相位编码脉冲组成一个脉冲串，合成大的带宽。在推导这种新雷达信号的模糊函数的基础上，着重分析了信号的距离高分辨特性和多普勒特性，通过比较得出结论：OFDM相位编码频率步进信号能有效实现距离高分辨，其多普勒敏感度介于OFDM相位编码和步进频信号之间。Abstract: Orthogonal Frequency-Division Multiplexing (OFDM) phase-coded radar has many prominent properties. However, there are some technical challenges on engineering realization, one of which is that instantaneous bandwidth is equal to the total bandwidth and large bandwidth leads to high requirement of the radar receiving technique. Aiming at this problem, a new radar signal named OFDM Phase-Coded Stepped-Frequency (OFDM-PCSF) signal is proposed. Several OFDM Phase-Coded (OFDM-PC) pulses with small bandwidth construct a pulse burst to synthesize large bandwidth, using stepped-frequency carriers. Based on deriving the ambiguity function of the new radar signal, the paper analyzes mainly the high range resolution and Doppler property. A conclusion is drawn that OFDM-PCSF signal can achieve high range resolution and the Doppler sensitivity is between the OFDM-PC pulse and the stepped-frequency signal.
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