Title :
Errors due to the reflectivity of calibration targets
Author :
Randa, J. ; Walker, D.K. ; Cox, A.E. ; Billinger, R.L.
Author_Institution :
Div. of Electromagn., Nat. Inst. of Stand. & Technol., Boulder, CO
Abstract :
For a microwave total-power radiometer, we consider the error introduced by neglecting the difference in the antenna reflection coefficient between when it views a distant scene and when it views a nearby calibration target. An approximate expression is presented for the error, and measurement results are presented that enable one to estimate the resulting uncertainty in the measured brightness temperature. This uncertainty ranges from about 0.1 K to several kelvins for the representative cases considered
Keywords :
calibration; error analysis; radiometry; remote sensing by radar; antenna reflection coefficient; brightness temperature; calibration target reflectivity; error approximation; microwave total-power radiometer; remote sensing by radar; Antenna measurements; Calibration; Layout; Measurement uncertainty; Microwave antennas; Microwave radiometry; Reflection; Reflectivity; Reflector antennas; Temperature measurement;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International
Conference_Location :
Anchorage, AK
Print_ISBN :
0-7803-8742-2
DOI :
10.1109/IGARSS.2004.1370662
