Title: Sidelobe suppression using convolutional windows in radar

Authors: Ajit Kumar Sahoo; Ganapati Panda

Addresses: Department of Electronics and Communication Engineering, National Institute of Technology Rourkela, Odisha 769008, India ' Indian Institute of Technology Bhubaneswar, School of Electrical Sciences, Bhubaneswar 751013, Odisha, India

Abstract: The matched filter output of pulse compression radar is associated with range sidelobes along with the mainlobe. To reduce these sidelobes, different types of windows are used as weighing function at the receiver. When the target is in motion, the reflected signal is Doppler-shifted version of the original transmitted signal. If this Doppler-shifted signal is passed through the receiver matched filter, it produces very low Peak to Sidelobe Ratio (PSR). In this paper, we have proposed the use of convolutional windows at the receiver along with amplitude tapered or phase distorted transmitted Linearly Frequency Modulated (LFM) signal to get high PSR value in Doppler shift condition. Exhaustive simulation studies are carried out for Time-Bandwidth (TB) product of 50 and 100 and it is found that convolutional windows provide superior PSR performance over conventional windows.

Keywords: pulse compression radar; linearly frequency modulated; LMF signals; Doppler shift; convolutional windows; PSR; peak to sidelobe ratio; sidelobe suppression.

DOI: 10.1504/IJSISE.2012.050320

International Journal of Signal and Imaging Systems Engineering, 2012 Vol.5 No.4, pp.253 - 259

Received: 05 Feb 2011
Accepted: 23 Mar 2011
Published online: 31 Dec 2014 *

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