Reference Signal Trusted Reconstruction for Passive Radar Based on Optimal Clutter Rejection
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摘要: 参考信号重构是数字电视外辐射源雷达信号处理的关键技术之一，重构信号质量直接影响监测信号中时域杂波抑制效果。针对工程应用中重构的参考信号与实际发射信号失配的问题，该文以监测信号时域杂波抑制效果最优为指标，提出一种基于“解调-重调制”的参考信号可信重构方法。首先介绍参考信号重调制方法并建立基于非理想发射信号的信号模型；然后推导了重调制参考信号与监测信号时域杂波抑制效果间的理论关系，基于杂波抑制效果最优的准则，得到可信重构参考信号；最后仿真和实测数据验证了该参考信号可信重构方法的有效性。Abstract: Reference signal reconstruction is one of the key technologies for signal processing of passive radar based on digital TV signals. The quality of the reconstructed signal affects directly the time-domain clutter suppression effect of the surveillance signal. To solve the problem that the reconstructed reference signal can not match the actual transmitted signal, this paper proposes a reference signal trusted reconstruction method based on “Demodulation-Remodulation” with the indicator that the optimal time-domain clutter suppression effect of the surveillance signal. First, the reference signal remodulation method is introduced and a signal model is established based on the non-ideal transmitted signal. Then, the theoretical relationship between the remodulation reference signal and the time-domain clutter suppression of the surveillance signal is derived. Based on the criterion of the optimal clutter suppression, the trusted reconstruction of the reference signal is obtained. Finally, simulation and field experiment verify the effectiveness of the reference signal trusted reconstruction method.
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表 1 监测信号杂波和目标参数
直达波 多径1 多径2 多径3 目标1 目标2 距离元 0 11 45 100 70 40 多普勒元 0 0 0 0 –30 20 强度(dB) 0 –8.8 –16.2 –14.9 –58.0 –45.0 
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表 2 RD谱基底和目标强度(dB)
基底 目标1强度 目标2强度 使用传统重构参考信号进行杂波抑制 43.67 54.53 69.32 使用可信重构参考信号进行杂波抑制 40.94 54.81 68.68
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