载波频偏对正交频分复用波形外辐射源雷达性能影响的研究

Impact of Carrier Frequency Offset on Passive Bistatic Radar with Orthogonal Frequency Division Multiplexing Waveform

利用正交频分复用(OFDM)波形外辐射源雷达进行目标跟踪和定位是国内外研究的热点之一。该文首先介绍了OFDM波形外辐射源雷达信号模型及其信号处理的关键技术。在此基础上重点从不同角度仿真研究了载波频偏估计误差对OFDM波形外辐射源雷达探测性能的影响,包括其对匹配滤波后目标参数估计精度的影响,对时域杂波抑制性能影响的定量分析,以及对参考信号重构误码率等方面的影响。仿真结果表明,不同时域杂波抑制算法对载波频偏估计误差要求不同;参考信号重构误码率对时域杂波抑制性能影响较大,对匹配滤波的影响较小。最后基于实测数据验证了分析结果的正确性。

Using passive radar with Orthogonal Frequency Division Multiplexing （OFDM） waveform for target track and location is recently a research spot at home and abroad. This paper first introduces the signal model for passive radar with OFDM waveform and key techniques during the signal processing. On that basis, how the estimation error of carrier frequency offset influences the detection performance of this radar is mainly investigated through simulation from different aspects, including the influences on target parameter estimation after match filtering, clutter rejection performance and bit error rate during reference signal reconstruction. The simulation results show that different temporal clutter rejection methods require different estimation accuracy of carrier frequency offset. The reconstruction bit error rate has a great impact on the temporal clutter rejection performance while having a little effect on match filtering. Finally, the analysis results are verified based on the measurement data.