A Calibration Method for Microwave Radiometer

A microwave radiometer and calibration technology, applied in the field of microwave radiometer, can solve the problem of high calibration cost of microwave radiometer, and achieve the effect of low cost, high precision and easy operation

Active Publication Date: 2014-10-29
中电科(青岛)电波技术有限公司
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of high calibration cost of microwave radiometers i...

Method used

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  • A Calibration Method for Microwave Radiometer
  • A Calibration Method for Microwave Radiometer
  • A Calibration Method for Microwave Radiometer

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] figure 1 Be used for the calibration method flowchart of microwave radiometer of the present invention, this method comprises the following steps:

[0018] Step 1, according to the brightness temperature transfer function, based on the brightness temperature of the reference blackbody and its corresponding voltage, and the initial value of the calibration coefficient a, calculate the sky brightness temperature corresponding to multiple zenith angles, wherein the initial value of the calibration coefficient a The value is preset;

[0019] Step 2, calculating the total atmospheric attenuation value corresponding to each of the multiple zenith angles based on the sky brightness temperatu...

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Abstract

The invention discloses a calibration method for a microwave radiometer. The calibration method includes calculating sky brightness temperature that a plurality of zenith angles correspond to according to the brightness temperature transfer function, calculating atmosphere total pad value that the plurality of zenith angles correspond to, conducting linear regression treatment on the secant value of the plurality of zenith angles and the atmosphere total pad value that the plurality fo zenith angles correspond to, utilizing slope of a straight line obtained by the linear regression treatment as the atmosphere total pad value at the time when the zenith angle is 0 degree, calculating the sky brightness temperature when the zenith angle is 0 degree, substitute the sky brightness temperature at the time when the zenith angle is 0 degree into the brightness transfer function to calculate the value of the corresponding calibration coefficient a, updating the value of the calibration coefficient a, repeating the above step to obtain a new a and circulating in this way to enable the restrained a as the calibration value. The calibration method only requires one microwave radiometer and a black body, is low in cost, convenient to operate and high in accuracy, and provides forceful support for detection of atmosphere temperature profile, atmosphere humidity profile and the like.

Description

technical field [0001] The invention relates to the technical field of microwave radiometers, in particular to a calibration method for microwave radiometers. Background technique [0002] The microwave radiometer is a passive ground-based microwave remote sensing device. The calibration method of the microwave radiometer is generally divided into two types: one is the step-by-step calibration method, and the calibration of the receiver and the calibration of the antenna are performed separately. There are many intermediate parameters measured, so the step-by-step calibration method has many error sources and low calibration accuracy; the other is the overall calibration method, which completes the calibration from the antenna calibration to the final output at one time, without intermediate links. Therefore, the calibration accuracy is higher than that of the step-by-step calibration method. In the overall calibration method, two stable noise sources at different temperatu...

Claims

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Application Information

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IPC IPC(8): G01S7/40G01S13/95
CPCY02A90/10
Inventor 赵振维李江漫舒婷婷韩恒敏
Owner 中电科(青岛)电波技术有限公司
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