Effects of Highpass Filtering on Transmitted Signals of Non-Linear Frequency Modulated Radar Systems

Salman Raju Talluri

doi:10.32452/IJAMT.2019.190193

Authors

Salman Raju Talluri Department of Electronics and Communications Engineering, Jaypee University of Information Technology Solan, Himachal Pradesh, India

DOI:

https://doi.org/10.32452/IJAMT.2019.190193

Keywords:

Non-linear frequency modulation, highpass filter, matched filter, auto-correlation, peak sidelobe level

Abstract

This paper presents an advantage of highpass filtering of a transmitted signal of nonlinear frequency modulated (NLFM) radar systems. Radar systems use NLFM signals for sidelobe level reduction in the output of the matched filter (MF). This paper suggests a further reduction in sidelobe levels of output of matched filters by highpass filtering. The output of matched filter is the autocorrelation of the input signal. Numerical simulations are performed on highpass filtered NLFM signals and the results obtained are compared with conventional linear frequency modulated (LFM) signal. From these results, it is proposed that highpass filtering on NLFM can be used to further improve the output of the matched filter considerably by reducing relative sidelobe levels.

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