Acta Optica Sinica, Volume. 40, Issue 16, 1606002(2020)
Channel-Mismatch Compensation of Photonic Analog-to-Digital Converter for Wideband Radar Direct Receiving
We analyze the channel mismatches in a multi-channel demultiplexing photonic analog-to-digital converter (PADC) applied in wideband radar receiving. We demonstrate a model of the channel mismatches and a method for extracting the mismatch information, and develop a channel-mismatch compensation algorithm. We analyze and compare the short-time Fourier transform spectra of the echo signals from the corner reflectors and the drone before and after the channel-mismatch compensation. The results confirm that the compensation algorithm can effectively suppress the intrinsic mismatches in the amplitude and delay mismatch caused by the multi-channel demultiplexing architecture of the PADC. The radar achieves wideband detection, covering a 4 GHz-bandwidth segment of the X-band and Ka-band signals. By comparison between the target detections of static and long-distance flying corner reflectors, we find that the compensated PADC effectively performs one-dimensional imaging of the corner reflectors installed 10 cm apart.
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Chenggong Li, Na Qian, Anyi Deng, Jianping Chen, Weiwen Zou. Channel-Mismatch Compensation of Photonic Analog-to-Digital Converter for Wideband Radar Direct Receiving[J]. Acta Optica Sinica, 2020, 40(16): 1606002
Category: Fiber Optics and Optical Communications
Received: Apr. 7, 2020
Accepted: May. 15, 2020
Published Online: Aug. 7, 2020
The Author Email: Zou Weiwen (wzou@sjtu.edu.cn)