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| Citation: | DONG Shuxian, WU Yaojun, FANG Wen, et al. Anti-interrupted sampling repeater jamming method based on frequency-agile radar joint fuzzy C-means[J]. Journal of Radars, 2022, 11(2): 289–300. doi: 10.12000/JR21205
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Anti-interrupted Sampling Repeater Jamming Method Based on Frequency-agile Radar Joint Fuzzy C-means
DOI: 10.12000/JR21205
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Abstract
Intermittent sampling noise modulation and forward jamming is a novel active jamming method with both suppression and deception characteristics and is a challenge often encountered in radar anti-jamming. To improve the capability of frequency-agile radar to resist noise-modulated Intermittent Sampling Repeater Jamming (ISRJ), we propose an anti-ISRJ method based on frequency-agile radar joint Fuzzy C-Means (FCM). First, we designed a radar-transmitted waveform with intra pulse frequency coding and inter pulse frequency agility. Second, after receiving the echo signal, we obtained the sub pulse signals corresponding to different intra-pulse frequency codes via narrow-band filtering in the frequency domain. Third, we adopted the FCM algorithm to determine the presence of ISRJs in the sub pulses after pulse compression. Finally, we realized the phase-coherent accumulation of inter pulse frequency-hopping waveform using the compressed sensing algorithm. Theoretical analysis and simulation experiments showed that the proposed method can effectively resist ISRJ. -
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- Figure 1. Flow chart of the proposed method
- Figure 2. Time-frequency diagram of radar transmitted pulse signal
- Figure 3. Ambiguity function diagram of the waveform designed in this paper
- Figure 4. Relationship curve between Doppler frequency and the main sidelobe ratio of distance fuzzy graph
- Figure 5. Antagonistic effect diagram of the proposed method against ISRJ-DF
- Figure 6. Antagonistic effect diagram of the proposed method against ISRJ-RF
- Figure 7. Judgment accuracy of FCM algorithm for ISRJ under different SNR
- Figure 8. Output SJR of different methods after 2-D sparse reconstruction