Performance Analysis of NLFM Signals with Doppler Effect and Background Noise
Nettem Adithya Valli1, Daniel Elizabath Rani2, Chandu Kavitha3

1C. Kavitha*, Department of Physics, Gitam University, Vishakhapatnam, India.
2N. Adithya valli, assistant professor, Lingaya’s engineering college Vijayawada, India.
3D. Elizabath rani, Professor & Principal, GITAM Institute of Technology, GITAM University, Visakhapatnam, India

Manuscript received on February 01, 2020. | Revised Manuscript received on February 05, 2020. | Manuscript published on February 30, 2020. | PP: 737-742 | Volume-9 Issue-3, February, 2020. | Retrieval Number: B3835129219/2020©BEIESP | DOI: 10.35940/ijeat.B3835.029320
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Abstract: This paper focuses on the study of effect of background noise and Doppler Effect on various Nonlinear Frequency Modulation (NLFM) waveforms designed using two stage piece-wise and three stage piece-wise linear and non linear functions. The background noise investigated is Additive White Gaussian Noise (AWGN). Simulations are carried out for different target speeds ranging from 100 to 5000km/hour to study Doppler Effect. The simulations are carried out using Matlab software. Among the waveforms designed, the NLFM function designed using two piece-wise Linear Frequency Modulation (LFM) is observed to be Doppler tolerant and also not affected by noise, as the SNR changes from -20 to 20 dB the peak side-lobe level (PSL) of this signal is around -34.84 dB.
Keywords: Linear frequency modulation, Non-Linear frequency modulation, Piece-wise functions, Peak-sidelobe level, Doppler Tolerance.