Dr. Dmitriy Chebanov Profile

Dr. Dmitriy Chebanov

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Proceedings Article | 15 April 2008 Paper

Low sidelobe nonlinear stepped-frequency waveforms

Dmitry Chebanov

Proceedings Volume 6947, 69470H (2008) https://doi.org/10.1117/12.777860

KEYWORDS: Radar, Nonlinear filtering, Filtering (signal processing), Fourier transforms, Fermium, Signal attenuation, Signal to noise ratio, Optical design, Linear filtering, Motion estimation

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Frequency stepping is one of the known techniques employed by modern radars to attain high range resolution. One of the main advantages of this approach is that it allows to achieve wideband pulse compression through narrowband processing. It is also known that the traditional linear stepped-frequency waveform suffers from relatively high range sidelobes and grating lobes that appear due to periodicities in the Discrete Fourier Transform (DFT). An amplitude weighting (applied prior to the DFT) is typically used to reduce the near-in sidelobes. This results in undesirable losses in sensitivity. In this paper, we propose a new approach that may be used to derive families of nonlinear stepped-frequency waveforms that would have desired characteristics such as suppressed grating lobes and built-in low range sidelobes. Our approach is based on new analytical properties of stepped-frequency waveforms presented in the paper. We give examples of nonlinear waveforms generated by this approach and show that they exhibit improved performance when compared with traditional waveforms.

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