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| Citation: | Feng Dejun, Wang Junjie, Wang Junqing. Signature Analysis and Discrimination Method of Preceded Frequency-shift False Target[J]. Journal of Radars, 2017, 6(4): 325-331. doi: 10.12000/JR17026
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Signature Analysis and Discrimination Method of Preceded Frequency-shift False Target
doi: 10.12000/JR17026
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Abstract
Due to the effect of range-Doppler coupling between the time delay and shifted frequency of an LFM waveform, LFM radar is particularly susceptible to shift frequency jamming. A new deceptive jamming method, the Preceded Frequency-shift False Target (PFFT), has a similar signature to real radar targets, which indicates that conventional ECCM, such as leading-edge tracking, could be invalid when countering it. In this paper, the basic principle of PFFT is introduced and its signatures analyzed. Then, a new method for discrimination between a preceded false target generated by Digital Radio Frequency Memory (DRFM) and a radar target is proposed. By comparing the echo arrival time at the radar receiver front end with that estimated after a matched filter, the new method can extract the frequency modulation jamming signature and make a correct judgment. Simulation results are presented to verify the validity of the proposed method. -
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References
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- Figure 1. Spectrum, Doppler spectrum, and matched filtering of true and false targets
- Figure 2. Diagram of preceded frequency-shift false target’s identification method
- Figure 3. Diagram of time-domain relationship between echo and reference signal
- Figure 4. Test results of preceded false target and true target