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Relaxing the ADC sampling rate in high-resolution radar systems through photonic analogue-to-digital conversion

Cruz, P. E. D. ; Alves , T. M. F. ; Cartaxo, A.

Relaxing the ADC sampling rate in high-resolution radar systems through photonic analogue-to-digital conversion, Proc International Conf. on Transparent Optical Networks - ICTON, Bucharest, Romania, Vol. We.P.1, pp. 1 - 4, July, 2018.

Digital Object Identifier: 10.1109/ICTON.2018.8473984

Abstract
A wavelength division multiplexing (WDM) photonic (Ph)-analogue-to-digital converter (ADC) architecture with time stretching that enables digitizing a high-resolution radar signal with low sampling rate ADCs is presented and evaluated using numerical simulation. Results show that, for a radar signal with a resolution of 3 cm, 4 samples along the radar pulse width can be captured by a 20-channel WDM Ph-ADC using ADCs with 1 GS/s, leading to a localization error of 0.75 cm. For a 10-channel WDM Ph-ADC using ADCs with 1.25 GS/s, up to 3 samples along the radar pulse width can be acquired, which results in a localization error of 1.2 cm.