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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 3 — Jan. 20, 2013
  • pp: 505–508

Errors from Rayleigh–Jeans approximation in satellite microwave radiometer calibration systems

Fuzhong Weng and Xiaolei Zou  »View Author Affiliations

Applied Optics, Vol. 52, Issue 3, pp. 505-508 (2013)

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The advanced technology microwave sounder (ATMS) onboard the Suomi National Polar-orbiting Partnership (SNPP) satellite is a total power radiometer and scans across the track within a range of ±52.77° from nadir. It has 22 channels and measures the microwave radiation at either quasi-vertical or quasi-horizontal polarization from the Earth’s atmosphere. The ATMS sensor data record algorithm employed a commonly used two-point calibration equation that derives the earth-view brightness temperature directly from the counts and temperatures of warm target and cold space, and the earth-scene count. This equation is only valid under Rayleigh–Jeans (RJ) approximation. Impacts of RJ approximation on ATMS calibration biases are evaluated in this study. It is shown that the RJ approximation used in ATMS radiometric calibration results in errors on the order of 1–2 K. The error is also scene count dependent and increases with frequency.

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Remote Sensing and Sensors

Original Manuscript: October 11, 2012
Revised Manuscript: December 27, 2012
Manuscript Accepted: December 27, 2012
Published: January 17, 2013

Fuzhong Weng and Xiaolei Zou, "Errors from Rayleigh–Jeans approximation in satellite microwave radiometer calibration systems," Appl. Opt. 52, 505-508 (2013)

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  1. F. Weng, X. Zou, X. Wang, S. Yang, and M. Goldberg, “Introduction to Suomi NPP ATMS for NWP and tropical cyclone applications,” J. Geophys. Res. 117, D19112 (2012). [CrossRef]
  2. F. Weng, H. Yang, and X. Zou, “On convertibility from antenna to sensor brightness temperature for ATMS,” IEEE Geosci. Remote Sens. Lett. (2012, to be published). [CrossRef]

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