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On time-frequency correlation in spectrogram samples with application to target detection
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DOI：10.1016/j.sigpro.2022.108648.png)
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Abstract
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This paper investigates the time-frequency correlation of spectrogram samples when overlapping windows are considered in the computation of the short-time Fourier transform (STFT). Specifically, a general closed-form formula is derived and its properties analyzed. Moreover, the practical usefulness is demonstrated on both simulated and real data, for the problem of small-drones detection based on FMCW radar. Results show that a pre-whitening filter compensating for the correlation can significantly improve the detection performance. (C) 2022 Elsevier B.V. All rights reserved.
Keywords:
Correlation
STFT
FMCW radar
Small-drone detection