Volume 32 Issue 3
May  2012
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He Jieying, Zhang Shengwei, Zhao Jin, Zhang Yu. Analysis of the system linearity caused by gain variation of satellite-borne microwave radiometer[J]. Journal of Space Science, 2012, 32(3): 449-454. doi: 10.11728/cjss2012.03.449
Citation: He Jieying, Zhang Shengwei, Zhao Jin, Zhang Yu. Analysis of the system linearity caused by gain variation of satellite-borne microwave radiometer[J]. Journal of Space Science, 2012, 32(3): 449-454. doi: 10.11728/cjss2012.03.449

Analysis of the system linearity caused by gain variation of satellite-borne microwave radiometer

doi: 10.11728/cjss2012.03.449
  • Received Date: 2011-01-17
  • Rev Recd Date: 2011-12-16
  • Publish Date: 2012-05-15
  • The characteristics analysis of diode detector of satellite-borne microwave radiometer has been described. In this paper, given a certain observation target, the retrieved brightness temperatures changed correspondingly with the different values of system Automatic Gain Control (AGC). By adjusting the system gain, a little change happened for detector working range. The variation caused by nonlinearity of diode can not be completely eliminated by using two-point calibration method. The brightness temperatures retrieved in this paper are in a wide range of 3~350K. The experimental results demonstrate that there is obvious nonlinearity for brightness temperatures between retrievals minus actual values and observing values, which can not be eliminated by using two-point calibration. So, in the process of working and real-time calibration, the system must be assured working in approximately linear working range with a certain AGC value as possible.

     

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