A method and system for detecting radiation stability of remote sensing instruments based on stable targets
A detection method and stability technology, applied in the field of radiation stability detection of remote sensing instruments based on stable targets, can solve problems such as stability attenuation
Active Publication Date: 2022-07-01
BEIJING HUAYUN SHINETEK TECH CO LTD
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However, the instrument will be subject to various factors such as the vibration during satellite launch, the harsh space environment after launch, and long-term operation aging, and its stability will attenuate with time and space changes; in order to improve the stability of remote sensing data, it is necessary to The target observation data is tracked and monitored for a long time, the radiation stability feedback is performed irregularly, and the calibration coefficient is updated and corrected in time
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[0053]Step 1: Extraction of stable target points. Based on the stable targets of the earth (mainly deserts, oceans, and polar ice caps) that are calibrated and tracked by the most widely used remote sensing instruments at home and abroad, the observation data DN of the window size is extracted with the target latitude and longitude as the center. value, calibration coefficient, extract center point satellite and sun zenith angle, azimuth, observation time, row number, column number, surface type, surface coverage, elevation, etc.; select calibration coefficient, including business, pre-launch laboratories Calibration coefficient and updated calibration coefficient; convert the observed DN value of the stable target into a multi-version reflectivity Ref according to different calibration coefficients, and calculate the average and standard deviation of the multi-version reflectivity within the window size respectively.
[0054] Step 2: Standardize the output, output the stable t...
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The invention discloses a radiation stability detection method and system of a remote sensing instrument based on a stable target. The method includes: acquiring stable target point data; converting the observed DN value into multi-version reflectivity according to different calibration coefficients; classifying the stable target point data according to classification parameters; screening the classified data according to screening conditions; The filtered data are removed discrete data, and the observed DN value time series and reflectance time series under clear sky observation conditions are retained; the reflectivity time series under clear sky observation conditions are subjected to a linear fitting to obtain the normalized attenuation time series of radiation response. ; Based on the observed DN value time series, the normalized attenuation time series of radiation response and the multi-version reflectivity time series under the condition of clear sky observation, the radiation stability of remote sensing instruments is detected. Through the technical solution disclosed in the present invention, it is possible to quickly and customize the detection of changes in the radiation response of the remote sensing instrument and the stability of the instrument observation.
Description
technical field [0001] The invention relates to the technical field of meteorological data processing, in particular to a method and system for detecting radiation stability of a remote sensing instrument based on a stable target. Background technique [0002] With the advancement of science and technology and the development of economy, meteorological remote sensing data has gradually been used in forestry, agriculture, water conservancy, transportation, environmental protection and other fields, and people's requirements for the quality of meteorological services have been continuously improved. However, the instrument will be affected by various factors such as vibration during satellite launch, harsh space environment after launch, and long-term operation aging, and its stability will be attenuated with time and space changes; in order to improve the stability of remote sensing data, it is necessary to The target observation data is tracked and monitored for a long time,...
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IPC IPC(8): G01W1/18G06K9/62
CPCG01W1/18G06F18/2113G06F18/241
Inventor 冉茂农覃平瞿建华袁明鸽
Owner BEIJING HUAYUN SHINETEK TECH CO LTD