Analyzing the Impact of Polynomial NLFM Signals on Radar Performance with Uniform and Non-Uniform PRI in Doppler Effect and Noise Environments

Abstract

Abstract: The problem of determining a suitable radar signal while reducing the autocorrelation sidelobes and analyzing such radar signal under Doppler Effect and background noise environments with non-uniform PRI is addressed. The high peak sidelobe is the fundamental drawback for a Linear Frequency Modulated signal (LFM), despite its advantage in the simplicity and Doppler tolerance properties. To address this issue, an Improved Polynomial-I & Polynomial-II Non-Linear Frequency Modulation (NLFM) signal was designed. Prior research demonstrated that constructed Polynomial NLFM (PNLFM) with Non-Uniform Pulse Repetition Interval (PRI) signal provides reduced Peak Side Lobe level (PSL) compared to LFM. To examine the overall performance, research is done on the produced PNLFM signal in the condition of Doppler Effect and background noise. The background noise considered is Additive white Gaussian noise (AWGN) with SNR values ranging from -20dB to 20dB. Simulations are performed using various doppler frequencies and background noises. The simulation results show that the PNLFM is Doppler-tolerant in the Doppler shift case, i.e. there is no effect on PSL levels with the doppler frequency change in either the uniform or non-uniform PRI case. However, with high background noise the PSL levels get affected, which increases the PSL values. From the results, it is observed that the PNLFM with Non-Uniform PRI has a good detectability since the peak side lobe level is low in certain cases of heavy background noise.

Key words: LFM, PNLFM, doppler effect, non-uniform PRI

Ch Anoosha, and B.T. Krishna. Analyzing the Impact of Polynomial NLFM Signals on Radar Performance with Uniform and Non-Uniform PRI in Doppler Effect and Noise Environments [J]. Int J Performability Eng, 2024, 20(8): 478-486.

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