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Remote Sensing Technology and Application  2019, Vol. 34 Issue (1): 101-106    DOI: 10.11873/j.issn.1004-0323.2019.1.0101
    
Quantification Error Analysis of Digital Correlator on Fully Polarization Microwave Radiometer
 Huang Yishen1,2,3,Wang Zhenzhan1,2,Lu Hao1,2
 ( 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  Fullypolarization microwave radiometer is a passive remote sensing device that measures the target’s microwave radiation characteristics.It is a complete extractiontechnology of polarization information such as amplitude,frequency and phase based on the traditional microwave radiometer.Digital correlator utilizes high-speed analog-to-digital converter and programmable logic device FPGA to realize quantification processing and related operations of horizontal and vertical channel signal.Compared to analog correlators,digital correlators have the advantage of high bandwidth and immunity from DC interference,but quantification errors are also introduced in the quantification process.This paperanalyzes the influence of 8 bit quantification on the correlation coefficient before and after quantification on digital correlation fully polarization radiometer whichdeveloped by NSSC.By determining the appropriate A/D quantification threshold,it is ensured that the error of the digital correlator has the least influence on the radiometer system.The reliability of the analysis conclusion is verified by modeling and simulation.The results show that the quantification error of 8 bit digital correlator developed by the project can be neglected to the system error.
Key words:  Fully polarization microwave radiometer      Digital correlator      8 bit quantification error     
Received:  07 March 2018      Published:  02 April 2019
ZTFLH:  P407.1  
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Huang Yishen, Wang Zhenzhan, Lu Hao. Quantification Error Analysis of Digital Correlator on Fully Polarization Microwave Radiometer . Remote Sensing Technology and Application, 2019, 34(1): 101-106.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2019.1.0101     OR     http://www.rsta.ac.cn/EN/Y2019/V34/I1/101

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