Open AccessModified PWNLFM Signal for Side-Lobe Reduction
Author(s) -
N. Adithya Valli,
Deepti Rani
Publication year - 2018
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i4.20.22110
Subject(s) - side lobe , chirp , autocorrelation , pulse compression , signal (programming language) , reduction (mathematics) , acoustics , frequency modulation , computer science , modulation (music) , weighting , mathematics , radar , electronic engineering , physics , telecommunications , optics , engineering , bandwidth (computing) , statistics , laser , geometry , antenna (radio) , programming language
Many applications in radar systems require low range side-lobe performance which is achieved by pulse compression processing. Most used chirp signal for this processing is linear frequency modulation (LFM) signal but with a presence of first high side-lobe level. Suppression of this side-lobe requires weighting function causing the reduction in signal to noise ratio at the receiver owing to mismatch loss. Non-linear chirp signals are introduced as a solution and became most practiced signals aimed at reducing side-lobes. In this paper, an overall piece wise non-linear frequency modulation chirp signal is designed by merging two stages, one with linear function and the other with a tangent based non-linear function. Simulation results show significant reduction in the sidelobe level of autocorrelation function when NLFM is generated in this method.