Scaling method of foundation microwave radiometer
A microwave radiometer and calibration technology, which is applied in the field of calibration, can solve the problems of large error of calibration brightness temperature value and error uncertainty, etc., to reduce calibration error, improve calibration accuracy, and improve inversion accuracy Effect
A microwave radiometer and calibration technology, which is applied in the field of calibration, can solve the problems of large error of calibration brightness temperature value and error uncertainty, etc., to reduce calibration error, improve calibration accuracy, and improve inversion accuracy Effect
CN104181511AInactive Publication Date: 2014-12-03NAT SPACE SCI CENT CAS
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[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0033] The method of the invention is applicable to the ground-based microwave radiometer of the K-band, and is also suitable for the window area with relatively high atmospheric transmittance and the ground-based microwave radiometer of other wave bands. In this embodiment, the method of the present invention will be described in detail by taking a K-band ground-based microwave radiometer as an example.
[0034] Before explaining the method of the present invention in detail, for ease of understanding, a brief description of the structure of the K-band ground-based microwave radiometer is given first.
[0035] refer to figure 1 , The K-band ground-based microwave radiometer includes an antenna, a multi-channel receiver, and a data recording module. Among them, the multi-channel receiver includes a radio frequency receiving module, an interme...
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The invention relates to a scaling method of a foundation microwave radiometer. The scaling method comprises: obtaining voltage values output through each channel in different attenuation values, calculating corresponding equivalent brightness temperature values through attenuation values, calculating system non-linear factors and noise source injection noises according to corresponding relation between each equivalent brightness temperature value and the output voltage of each channel, and completing preliminary scaling; according to sounding profile data matching with time and place, establishing a corresponding relation of atmosphere optics thickness and atmosphere quality, substituting scaling parameters, obtaining a scaling relation curve, determining the scaling parameters according to the scaling relation curve; observing cold air and cold air coupling noises at each attenuation value, obtaining voltage values output through each channel at different attenuation values and fitting the attenuation values and the voltage values; calculating the equivalent noise temperature when an antenna aligns with the cold air through the relation of the attenuation values and the output voltage values of the attenuator, and determining the brightness temperature values corresponding to the cold air observed by the foundation microwave radiometer in different time and places.
Description
technical field [0001] The invention relates to a calibration method, in particular to a ground-based microwave radiometer calibration method. Background technique [0002] The K-band microwave radiometer is a passive microwave remote sensor that can penetrate clouds and rain areas, and can be used for all-day and all-weather observation of global atmospheric humidity, water vapor content, rainfall and other meteorological data. Calibration technology is a key technology in microwave radiometer design. Due to the special working environment of the ground-based radiometer, affected by the attenuation of the atmosphere, there is no cosmic cold space background on the ground to use, and the reference source is a high-temperature source compared with the brightness temperature of the atmospheric radiation. error, so it is critical to determine the dynamic response relationship for the full observation range. [0003] At present, the high and low temperature two-point linear ca...
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Patent Timeline
03 Dec 2014
Publication
CN104181511A
- IPC
- G01S7/40; G01S13/95
- CPC
- G01S7/40; Y02A90/10
- Inventors
- 何杰颖; 张升伟