Student Paper 2.18
Range sidelobes suppression for wideband randomly discontinuous spectra OTH-HF radar signal

Dongpo Zhang - Shanghai Jiao Tong University, Xingzhao Liu - Shanghai Jiaotong University

Tue, 27 April 2004, 3:20 PM - 4:10 PM

Abstract

Over-The-Horizon(OTH) HF radars work at heavily congested HF band. It is quite difficult to find broad clear frequency bands for system requirements. The randomly discontinuous spectra (RDS) signal is employed to combat spectrum congestion since it can evade the external interferences in frequency domain. However, the spectra discontinuity of the signal gets rise to high range sidelobes when matching the reflected echo, which is much more difficult for targets detection. So it is indispensable to investigate the technique for sidelobes suppression of the range profile when RDS signal is utilized. In this paper we introduce a new signal processing technique that is radically different from the conventional technique to lower range sidelobes based on suppressing the self-clutter of the radar range ambiguity function (AF) by mismatch filtering. Simulation results show that the peak sidelobe level can be reduced to -30dB while the frequency bands span up to 400KHz.

Bios

Dongpo Zhang was born in 1975, received BS degree and MS degree at Dept. of Electronic and Communication Engineering of Harbin Institute of Technology, in 1998 and 2000 respectively. Now he is working on his Ph.D at Electronic Engineering Department of Shanghai Jiaotong University. His interests include signal processing of HF radar and radar waveform design.

Dr. Xingzhao Liu - Shanghai Jiaotong University

Xingzhao Liu was in 1962 and received Ph. D. Degree in 1995 at the Dept. of EE of the University of Tokushima, Japan. Right now he is a professor at the Dept. of Electronic Engineering of Shanghai Jiaotong University. His interests mainly include signal processing for HF and SAR radar systems.