A method and system for nonlinear correction of brightness temperature of microwave radiometer
A technology of microwave radiometer and non-linear correction, applied in the direction of radio wave measurement system, instrument, etc.
Inactive Publication Date: 2019-01-25
NAT SATELLITE METEOROLOGICAL CENT
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This paper reveals a detailed description of the non-linear correction of microwave radiometer vacuum calibration data using the small U method in Europe, and achieved good results; however, the small U method in this paper can only present quadratic curve mathematics for the microwave radiometer response The model form is valid, but the mathematical model form is invalid for the microwave radiometer response presenting multiple curves
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[0075] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0076] Take the FY3C model microwave radiometer receiver to realize a microwave radiometer brightness temperature nonlinear correction method of the present invention as an example;
[0077] The FY3C radiometer has 13 operating frequencies, and each operating frequency can perform brightness temperature correction. Using this model to perform brightness temperature nonlinear correction, the steps are as follows:
[0078] Firstly, the ground vacuum calibration test is carried out in the ground vacuum calibration test module A, and the slope and intercept of the brightness temperature curve are determined through two-point linear calibration according to the measured brightness temperature of the spaceborne black body and cold space;
[0079] figure 2 It is a schematic diagram of linear low temperature correction in a microwave radiometer brightness temper...
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A microwave radiometer brightness temperature non-linear correction method and system comprises a microwave radiometer brightness temperature non-linear correction system and a microwave radiometer brightness temperature non-linear correction method. The functions of the modules in the microwave radiometer brightness temperature non-linear correction system are that: a ground vacuum calibration test module A carries out a ground vacuum calibration test, a microwave radiometer is measured in a ground vacuum tank to observe the receiver response values of a hot calibration source and a cold calibration source; the function of a satellite in-orbit measurement black body and cold space module B is to observe a hot source black body and a deep space cold source to obtain the receiver response after the microwave radiometer is emitted to enter an orbit; the function of a low temperature correction module C is to observe the difference between an expanded receiver count value and a count value obtained by using the radiometer to observe the deep space cold source 2.73 k directly in the orbit via the two-point calibration and to carry out the low temperature correction; and a nonlinear correction module D adopts the data obtained by the ground vacuum calibration test module A to list the equations of higher degrees of channels, and then carries out the nonlinear correction.
Description
technical field [0001] The invention relates to a method and system for nonlinear correction of brightness temperature of a microwave radiometer, belonging to the technical field of microwave instrument calibration. Background technique [0002] The microwave radiometer is currently the only spaceborne microwave remote sensing instrument capable of simultaneously detecting the vertical temperature and humidity broad lines of the atmosphere. Because its specific channel has the function of absorbing oxygen and water vapor in the atmosphere, using these physical characteristics can detect the atmospheric vertical temperature and humidity broad line. [0003] The currently popular non-linear correction methods for brightness temperature of microwave radiometers in the world are mainly the non-linear coefficient U correction method of AMSU in Europe and the non-linear correction method of ATMS linear calibration and Lagrangian median value theorem in the United States. This met...
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IPC IPC(8): G01S7/40
CPCG01S7/40G01S7/4021
Inventor 安大伟
Owner NAT SATELLITE METEOROLOGICAL CENT