A fast Doppler beam sharpening approach based on short time FFT

Chao Wang; Yanfei Wang; Qi Wang; Xueli Zhan; Chang Liu

doi:10.1117/12.2505118

31 August 2018 A fast Doppler beam sharpening approach based on short time FFT

Chao Wang, Yanfei Wang, Qi Wang, Xueli Zhan, Chang Liu

Proceedings Volume 10835, Global Intelligence Industry Conference (GIIC 2018); 108351D (2018) https://doi.org/10.1117/12.2505118
Event: Global Intelligent Industry Conference 2018, 2018, Beijing, China

Abstract

Doppler Beam Sharpening (DBS) technology and Short time FFT Transform (STFT) are both widely used in unmanned airborne scanning radar for Ground Moving Target Indicator (GMTI) mode, by which radar acquires medium-resolution images of vast areas and detects moving targets in the area. Traditional DBS method is independent of GMTI, hence data must be copied and processed individually, which consume more memories and computation time. We propose a new method to synthetize a long aperture FFT result for DBS imaging with several short aperture FFTs generated by STFT, which is suitable for real-time DBS processing. For data after range compression and STFT in the azimuth direction, a proper up-sampling in the Doppler domain is performed firstly. Secondly, up-sampled data of each sub-aperture are multiplied a function with linear phase to shift corresponding signal of time domain. Finally, we sum data over sub-apertures and get a long aperture FFT result, which equals to the direct FFT result in traditional DBS processing. The effectiveness of the proposed algorithm is validated by simulated data.

Citation Download Citation

Chao Wang, Yanfei Wang, Qi Wang, Xueli Zhan, and Chang Liu "A fast Doppler beam sharpening approach based on short time FFT", Proc. SPIE 10835, Global Intelligence Industry Conference (GIIC 2018), 108351D (31 August 2018); https://doi.org/10.1117/12.2505118

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KEYWORDS

Doppler effect

Target detection

Radar

Detection and tracking algorithms

Phase shifts

Unmanned aerial vehicles

Microwave remote sensing

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