| Autor: |
Gangwar, Rishi Kumar, Chakraborty, Abhisek, Chakraborty, Prantik, Thapliyal, Pradeep Kumar |
| Zdroj: |
Journal of the Indian Society of Remote Sensing; Feb2023, Vol. 51 Issue 2, p299-305, 7p |
| Abstrakt: |
The present study focuses on the uncertainty analysis of the Horizontal polarized (H-pol) and the Vertical polarized (V-pol) Brightness Temperature (BT) measurements in Ku-band from the SCATSAT-1 scatterometer. The SCATSAT-1 noise measurements were primarily meant for the subtraction of noise from the radar echo. Unlike conventional radiometers, the Ku-band noise emission measurements are used to derive uncalibrated brightness temperatures, which are further used for discriminating between rainy and non-rainy conditions. The present study is a first attempt to quantify the uncertainties in SCATSAT-1 BT by comparing it with the simulated BT using radiative transfer model for the period January–May, 2019. The comparison result showed that SCATSAT-1 BTs have larger biases than those in the simulations, which can be attributed to the fact that SCATSAT-1 BTs are uncalibrated. However, the uncertainty analysis shows that the standard deviation in the SCATSAT-1 BT observations in radiometer mode over homogeneous regions is about 2.5 K for both the polarizations, which is quite remarkable considering the narrowband noise measurement from the radar. Moreover, the BT uncertainty over homogeneous regions in the Indian Ocean is consistent throughout the study period. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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