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Design of Distributed High Speed Data Acquisition System in Synthetic Aperture Radiometer |
Xuning Mao1,2,3(),Hao Lu1,2,Hao Liu1,2() |
1.Key Laboratory of Microwave Remote Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China 2.National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China 3.University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract With the increasing demand of synthetic aperture radiometer for high resolution, the scale of signal acquisition channels has risen rapidly, reaching tens or even hundreds of channels. In this paper, a distributed signal sampling and processing system is proposed. At the same time, a high-speed data acquisition and transmission network based on distributed correlation system is designed, with 24 channels and 60 Msps sampling rate. On the hardware, a clock link is designed based on Distributed Multi-level distribution to realize digital synchronous sampling, and the test results show that the phase delay between channels is less than 1.5 degrees. In order to realize the high-speed optical fiber link between the multi-digital sampling array and the back-end correlation units, the Racket I/O transceiver built in the FPGA is used as the physical layer, and the test results show that the bit error rate is lower than 10-7.The system has high stability and reliability, and is suitable for requirements of large-scale synthetic aperture radiometers.
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Received: 30 March 2019
Published: 10 July 2020
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Corresponding Authors:
Hao Liu
E-mail: 1520046505@qq.com;liuhao@mirslab.cn
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