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Remote Sensing Technology and Application  2011, Vol. 26 Issue (3): 283-286    DOI: 10.11873/j.issn.1004-0323.2011.3.283
article     
Design of Twenty-four Channels Digital Correlation in Synthetic Aperture Radiometer
LU Hao1,2,WANG Zhen-zhan1
(1.Center for Space Science and Applied Research,Chinese Academy of Sciences,
Beijing 100190,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)
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Abstract  

The synthetic aperture radiometer needs to complete correlations of many different channels.To solve the problem that the correlator unit of synthetic aperture radiometer is becoming so complex that it is not convenient for the implementation of spaceborne radiometer,a novelty design of digital correlator is given.Digital correlator is the main part of the synthetic aperture radiometer.The technology of new FPGA-Virtex5 and twelve hig speed analog\|digital converter AD9287 is used to complete correlation of twenty\|four polarization channels at 100 MHz sampling rate with 8 bit resolution.All the self\ and cross correlation calculations are processed at the same time in FPGA.The program can be easily erased to change the important parameters such as integration time.Structure of the system,interface circuit and software method are introduced in detail.The problem of bulk,power and complex correlation are all solved.Novel correlator with more sampling rate and more resolution can be designed based on the template given in the paper.
 

Key words:  Synthetic aperture radiometer      FPGA;High-speed ADC      Digital correlation      Down sampling     
Received:  15 October 2010      Published:  23 January 2013
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Cite this article: 

LU Hao,WANG Zhen-zhan. Design of Twenty-four Channels Digital Correlation in Synthetic Aperture Radiometer. Remote Sensing Technology and Application, 2011, 26(3): 283-286.

URL: 

http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2011.3.283     OR     http://www.rsta.ac.cn/EN/Y2011/V26/I3/283

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