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Research on Interrupted Sampling Repeater Jamming Performance Based on Joint Frequency Shift/Phase Modulation.

Jie Xiao1, Xizhang Wei1, Jia Sun1

  • 1School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518000, China.

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Summary
This summary is machine-generated.

This study introduces an improved interrupted sampling repeater jamming (ISRJ) method to overcome inherent defects in classic active coherent jamming. The new technique effectively generates strong false targets and blanket jamming areas for radar systems.

Keywords:
ISRJelectronic countermeasuresfrequency shift modulationphase modulation

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Area of Science:

  • Electronic Warfare
  • Radar Systems Engineering
  • Signal Processing

Background:

  • Interrupted sampling repeater jamming (ISRJ) is a classic active coherent jamming technique.
  • ISRJ suffers from inherent limitations including discontinuous time-frequency distribution, predictable pulse compression results, limited amplitude, and lagging false targets.
  • Existing theoretical frameworks have not fully resolved these ISRJ defects.

Purpose of the Study:

  • To analyze the impact of ISRJ on linear-frequency-modulated (LFM) and phase-coded signals.
  • To propose an improved ISRJ method addressing the limitations of traditional ISRJ.
  • To enhance jamming performance by creating strong pre-lead false targets and blanket jamming areas.

Main Methods:

  • Developed an improved ISRJ method utilizing joint subsection frequency shift and two-phase modulation.
  • For LFM signals, achieved coherent superposition of jamming signals by controlling frequency shift matrices and phase modulation parameters.
  • For phase-coded signals, employed code prediction and two-phase modulation to generate false targets mimicking noise interference.

Main Results:

  • The improved ISRJ method successfully generates strong pre-lead false targets for LFM signals.
  • The technique creates multiple positions and ranges of blanket jamming areas for LFM signals.
  • For phase-coded signals, generated false targets effectively simulate noise interference, overcoming traditional ISRJ limitations.

Conclusions:

  • The proposed improved ISRJ method effectively overcomes the inherent defects of traditional ISRJ.
  • This advanced jamming technique offers enhanced capabilities for electronic warfare applications.
  • The method demonstrates significant improvements in generating sophisticated false targets and jamming coverage.