| Citation: | LIANG Liya, YUAN Saisai, XU Xiaojianet al. Measurement and extraction technique of scattered signals for targets under complex background[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2232-2237. doi: 10.13700/j.bh.1001-5965.2018.0020(in Chinese)
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Zero-Doppler clutter (ZDC) caused by the surrounding environment of an outdoor measurement field is one of the major factors which degrade the accuracy of the target scattering signatures in wideband radar cross section measurement. A new technique for ZDC estimation based on maximal probability is proposed to effectively suppress background clutter and improve the measurement uncertainty. In this technique, an initial ZDC estimate for each frequency is obtained by sliding windowed average of the samples over azimuthal angles. The maximal probability amplitudes of the initial ZDC estimates are then calculated for each frequency. Refined ZDC estimates are finally obtained through threshold processing based on the maximal probability amplitude statistics. In this way, the residual target signal components in the initial ZDC estimates are greatly suppressed. As a consequence, accurate background clutter extraction and subtraction are achieved. The experimental results of outdoor data processing for typical targets are presented to demonstrate the effectiveness of the proposed technique.
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