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

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.