Range-Doppler Two-dimensional Jamming Reconstruction Algorithm Based on Interpulse Code Agile Waveform

Abstract

Dense false target jamming generates a large number of false targets around the real target, leading to dual jamming effects of deception and suppression. This severely affects the target detection ability of the radar. Therefore, this study proposes a range-Doppler two-dimensional jamming reconstruction algorithm based on the interpulse code agile waveform to suppress dense false target jamming. Based on the range-gating characteristics of the interpulse code agile waveform, the jamming and target echo reconstruction in the range-Doppler domain is realized by alternate inversion. Reconstruction jamming is eliminated by the iterative cancellation method. First, the jamming and target echo are processed by constructing receiving filter banks with different range intervals. Second, a joint mismatched filter bank is used to make the range sidelobe structure of each pulse filter output approximately the same. This reduces the divergence energy along the Doppler dimension after the pulse Doppler processing of the interpulse code agile waveform. The filter matrix is then constructed using the energy distribution characteristics of the jamming and target echo in different range-Doppler regions. Finally, accurate jamming and target echo reconstruction are achieved by alternate inversion to suppress dense false target jamming. Simulation results demonstrate the superior performance of the proposed algorithm in terms of jamming suppression and running time compared with traditional algorithms. These procedures significantly improve the target detection capability of the radar in strong jamming scenarios.

Keywords

• interpulse code agile waveform
• dense false target jamming
• jamming reconstruction
• rang-gating characteristics
• alternate inversion