Zhang Zhou,Wang Zhenzhan,He Wenming,Tong Xiaolin,Ding Jia. XXXX. Analysis of Resampling Error of FY3D/MWRI at Different Orbital Positions. National Remote Sensing Bulletin, XX(XX):1-14
Zhang Zhou,Wang Zhenzhan,He Wenming,Tong Xiaolin,Ding Jia. XXXX. Analysis of Resampling Error of FY3D/MWRI at Different Orbital Positions. National Remote Sensing Bulletin, XX(XX):1-14 DOI: 10.11834/jrs.20243207.
Analysis of Resampling Error of FY3D/MWRI at Different Orbital Positions
Objective and Method:The Microwave Radiation Imager (MWRI) on China's Fengyun-3 (FY3) satellite can provide effective data for various fields such as meteorological research and weather forecasting. When using MWRI data for co-inversion of multi-frequency detection channels
it is necessary to consider resampling to make the data of different detection frequency points have a consistent spatial resolution. The Backus-Gilbert (BG) method is a widely used resampling method for spaceborne microwave radiometers. The traditional resampling method uses the BG method to calculate the weight coefficient of the sampling points obtained by a single rotation scan of the radiometer (precalculated weight coefficient)
and directly applies it to all sampling points obtained by the rotation scan
thereby completing the resampling of all data. However
during the sampling process of satellite instruments
the influence of factors such as the ellipsoid of the earth will lead to changes in the relative positions between the observation fields
and directly applying the pre-calculated weight coefficients to all the data will bring errors in resampling. Therefore
in this paper
based on the orbit parameters and pattern information of FY3D MWRI
we propose a resampling method combined with antenna pattern projection positioning
and analyze the resampling effect of MWRI at different orbit positions in detail.In the resampling experiments with fixed scan lines
we implement resampling for different combinations of source and target channels on the 200th scan line of the sample data. The results show that the traditional resampling method can achieve a better resampling effect by applying the BG method on a fixed scan line. In resampling experiments at different scan lines. We randomly selected sample data in the time range from 20190401 to 20191211
and calculated the positional changes of the adjacent points in the source pattern of the 1st
44th
and 133rd scan columns with the increase of the scan lines of the sample data. The fit error due to positional changes is then calculated using precomputed weighting factors. The maximum change in the position of the adjacent points can lead to a deterioration of the fit error of about 0.09. In the error analysis experiment
we verified the correction effect of the resampling method in this paper on the brightness temperature (BT) error on the MWRI sample data and long-term data by calculating the distribution of the BT difference between channels. Specifically
the resampling method adopted in this paper can correct the average BT error of 1.32 K on 10 different channel combinations of MWRI.In conclusion
this paper analyzes the resampling effect of the MWRI instrument at different orbital positions in detail. A source of error in resampled BT is pointed out and corrected. In the future
when multi-frequency detection channel data are used to collaboratively retrieve geophysical parameters
more accurate retrieval results may be obtained by applying the resampled data obtained in this paper based on the sensitivity of the parameters to changes in BT.
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University of Chinese Academy of Sciences, College of Resources and Environment
China University of Geosciences (Wuhan), School of Geography and Information Engineering, Laboratory of Regional Ecological Processes and Environmental Evolution
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, State Key Laboratory of Resources and Environmental Information System
Research Center for UAV Applications and regulation, Chinese Academy of Sciences
Key Laboratory of Low Altitude Geographic Information and Air Route, Civil Aviation Administration of China