Remote sensing instrument radiation stability detection method and system based on stable target
A detection method and stability technology, which is applied in the field of radiation stability detection of remote sensing instruments based on stable targets, and can solve problems such as stability attenuation
Active Publication Date: 2022-03-18
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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[0054]Step 1: Extraction of stable target points, based on the most widely used remote sensing instruments at home and abroad to calibrate and track the earth’s stable targets (mainly deserts, oceans, and Arctic and Antarctic ice sheets), extract the observation data DN of the window size centered on the target longitude and latitude Value, calibration coefficient, extract center point satellite and sun zenith angle, azimuth angle, observation time, line number, column number, surface type, surface coverage, elevation, etc.; select calibration coefficient, including business, pre-launch laboratory Calibration coefficient and updated calibration coefficient; convert the observed DN value of the stable target into multi-version reflectance Ref according to different calibration coefficients, and calculate the reflectance mean and standard deviation of multiple versions within the window size respectively.
[0055] Step 2: Standardize the output, output the extracted data of the s...
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The invention discloses a remote sensing instrument radiation stability detection method and system based on a stable target. The method comprises the following steps: acquiring stable target point data; converting the observation DN value into multi-version reflectivity according to different calibration coefficients; classifying the stable target point data according to the classification parameters; screening the classified data according to a screening condition; discrete data rejection is carried out on the screened data, and an observation DN value time sequence and a reflectivity time sequence under a clear sky observation condition are reserved; performing primary linear fitting on the reflectivity time sequence under the clear sky observation condition to obtain a radiation response normalized attenuation time sequence; and detecting the radiation stability of the remote sensing instrument based on the observation DN value time sequence, the radiation response normalized decay time sequence and the multi-version reflectivity time sequence under the clear sky observation condition. Through the technical scheme disclosed by the invention, the radiation response change of the remote sensing instrument and the observation stability of the instrument can be quickly detected in a customized manner.
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 the economy, meteorological remote sensing data has gradually shown its talents in many fields such as forestry, agriculture, water conservancy, transportation, and environmental protection. People's requirements for the quality of meteorological services are constantly improving. However, the instrument will be subject to various factors such as vibration during satellite launch, harsh space environment after launch, and long-term operational aging, and its stability will decay 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