Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation
Abstract
:1. Introduction
- Its time–frequency (TF) distribution is the same within an interrupted sampling period, and the distribution characteristics are discontinuous.
- The pulse compression results have a strong distribution regularity for different signals. A set of false target strings are generated for the LFM signal, and the multi-order false target is centered on the zero-order false target, showing a symmetrical attenuation distribution on both sides. The amplitude decays rapidly with the increase in the order. There is only one lagging false target for the phase-coded signal.
- The jamming amplitude is limited and proportional to the duty cycle. The attenuation speed of multi-order false target amplitude is proportional to the duty cycle for the LFM signals.
- The zero-order false target lags behind the real target by at least one interrupted sampling pulse width. The smaller the interrupted sampling pulse width, the smaller the distance between the zero-order false target and the real target, and vice versa. Therefore, when the interrupted sampling pulse width is small, the detection probability of the real target can be enhanced in one range cell. When the interrupted sampling pulse width is large, the lag time of the zero-order target is longer, which may expose the real target.
- For LFM signals, joint modulation solves the problem of the same time–frequency distribution within an interrupted sampling period and destroys the distribution law of the pulse compression result. The coherent superposition of jamming signals is achieved by controlling the frequency shift matrix and phase modulation parameters. The strong false target or interference area is formed before the real target.
- For the phase-coded signals, the frequency shift modulation is reduced, and the pre-lead false target is generated using code sequence prediction and two-phase modulation. In addition, the sidelobe is similar to the noise interference, and the interference range is increased.
2. The Principle of ISRJ
2.1. ISRJ
2.2. Analysis of ISRJ Parameters for LFM Signals
2.3. Analysis of ISRJ Parameters for Phase-Coded Signals
3. Frequency Shift and Phase Modulation Characteristics of ISRJ
3.1. Frequency Shift and Phase Modulation Characteristics of ISRJ for LFM Signals
3.1.1. Frequency Shift Modulatin Characteristics
3.1.2. Phase Modulation Characteristics
- (1)
- The phase modulation code sequence width mainly affects , , the effective false target amplitude, and interference range. However, the influence of on the false target amplitude and the interference range are mutually restricted. Therefore, to increase the phase modulation effect, the influence of on the interference amplitude should be reduced as much as possible. The weight of should be increased in the amplitude adjustment.
- (2)
- The additional phase affects , which works through the relationship between the additional phases, and the effect is complex.
3.2. Frequency Shift and Phase Modulation Characteristics of ISRJ for Phase-Coded Signals
3.2.1. Frequency Shift Modulation Characteristics
3.2.2. Phase Modulation Characteristics
4. ISRJ Based on Joint Frequency Shift/Phase Modulation
4.1. No Phase Jump in the Code Sequence Segmented Frequency Shift Slice
4.2. Phase Jump in the Code Sequence Segmented Frequency Shift Slice
5. Simulation
5.1. Frequency Shift and Phase Modulation Characteristics of ISRJ
5.2. Frequency Shift/Phase Joint Modulation Characteristics of ISRJ
5.3. Comparative Analysis of the Modulation Methods in This Paper and Other Modulation Methods
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Parameter | Symbol | Unit | Value |
---|---|---|---|
Signal-to-noise ratio | SNR | dB | 0 |
Jamming-to-signal ratio | JSR | dB | 20 |
Pulse width | μs | 51.1 | |
Carrier frequency | GHz | 3 | |
Sampling frequency | MHz | 200 | |
Band | B | MHz | 50 |
Target location | km | 8 | |
Interrupted sampling pulse width | μs | 5.11 | |
Interrupted sampling period | μs | 25.55 | |
The number of interrupted sampling periods | 2 |
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Xiao, J.; Wei, X.; Sun, J. Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation. Sensors 2023, 23, 2812. https://doi.org/10.3390/s23052812
Xiao J, Wei X, Sun J. Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation. Sensors. 2023; 23(5):2812. https://doi.org/10.3390/s23052812
Chicago/Turabian StyleXiao, Jie, Xizhang Wei, and Jia Sun. 2023. "Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation" Sensors 23, no. 5: 2812. https://doi.org/10.3390/s23052812
APA StyleXiao, J., Wei, X., & Sun, J. (2023). Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation. Sensors, 23(5), 2812. https://doi.org/10.3390/s23052812