Parameter Estimation of Unknown Envelope Multicomponent LFM Signal

doi:10.3969/j.issn.1000-1093.2016.03.011

Abstract

Abstract: For the estimation of unknown envelope multicomponent linear frequency modulation(LFM) signal in radar reconnaissance, the methods for the estimation of pulse number, frequency modulation rate, center frequency, delay and pulse width are proposed based on time-frequency analysis and coherent accumulation. A rough estimation is done for the parameters of pulse number as well as frequency modulation rate by time-frequency analysis, after which a fine estimation is conducted based on fractional Fourier transform(FRFT). Then some parameters, such as center pulse, delay and pulse width, can be extracted by coherent accumulation. Simulation results show that the weak pulse parameters estimation may be affected by strong pulse, which can be solved by filtering in FRFT domain. At last, Cramer-Rao low bounds of parameters are derived, and the estimation errors of parameters are analyzed. Results show that the estimation accuracy of width of weak pulse can be improved significantly after strong pulse filtering.

Key words: radar engineering, multicomponent linear frequency modulation signal parameter estimation, time-frequency analysis, fractional Fourier transform, Cramer-Rao low bound

CLC Number:

TN911

XU Zhou, ZHANG Hao, CHENG Shui-ying. Parameter Estimation of Unknown Envelope Multicomponent LFM Signal[J]. Acta Armamentarii, 2016, 37(3): 462-470.

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