An apparatus and method for measuring a microwave radiometer back lobe
A microwave radiometer and measuring device technology, which is applied in geophysical measurement and instruments, can solve problems such as differences in radiation transmission parameters, influence on table parameter accuracy, and misjudgment of radiation brightness temperature, and achieve simple calculation, easy operation, and low cost Effect
Inactive Publication Date: 2017-02-22
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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Problems solved by technology
However, due to the influence of antenna radiation efficiency or main beam efficiency, the brightness temperature received by the microwave radiometer often includes the influence of surrounding interference targets, that is, side lobes or back lobes cause misjudgment of the radiation brightness temperature of the real target, especially in the microwave radiation transmission process The difference in radiative transfer parameters caused by the influence of passive microwave remote sensing on the accuracy of surface parameters
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specific Embodiment approach 1
[0075] Using the measuring device and measuring method of the present invention, taking the Ka-band dual-polarization microwave radiometer as an example, the size of the back lobe of the bare permafrost is measured. Assuming that the width d of the liquid nitrogen tank 3 is 20 cm, and the main beam angle α of the microwave radiometer is 15°, then the limited height h calculated by h=d / (2*tan(0.5*α)) is 75 cm, that is, the liquid nitrogen tank The distance between 3 and the opening of microwave radiometer antenna 5 cannot exceed 75cm. Adjust the distance between the liquid nitrogen tank 3 and the opening of the microwave radiometer antenna 5 to 0cm, turn on the automatic measurement function of the microwave radiometer, and finally select the distance range of 0-25cm to realize the microwave radiation measurement at different heights at intervals of 5cm. The microwave radiation measurement data of the microwave radiometer receiver 4 is recorded in real time through the data ter...
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Abstract
An apparatus and method for measuring a microwave radiometer back lobe, relates to the field of microwave radiation characteristic measurement and realizes quantitative analysis of microwave radiometer back lobes. The apparatus comprises a pedestal, a lifting platform, a storage battery and a data terminal; the microwave radiometer includes a microwave radiometer receiver separately connected to the storage battery and the data terminal and a microwave radiometer antenna connected to the microwave radiometer receiver and fixed on the pedestal. An opening of the microwave radiometer antenna is arranged in a vertically upward mode. The apparatus also comprises a liquid nitrogen tank fixed to the lifting platform, wherein the liquid nitrogen tank is a porous absorbing material tank filled with liquid nitrogen; and a scale fixed to the inside of the lifting platform for determining the distance between the liquid nitrogen tank and the opening of the microwave radiometer antenna. A running program is installed in the data terminal for controlling the lifting height of the lifting platform and recording the microwave radiation measurement data of the microwave radiometer receiver in real time. The apparatus of the invention has advantages of a simple structure, strong operationality, low cost, high universality and simple calculation.
Description
technical field [0001] The invention relates to the technical field of microwave radiation characteristic measurement, in particular to a measuring device and a measuring method for a microwave radiometer backlobe. Background technique [0002] Microwave bands (such as L-band, Ka-band, and K-band) have strong penetrability, and can penetrate through vegetation or forest canopy to detect parameters such as soil moisture, snow parameters, permafrost depth, and freeze-thaw state on the surface. The main bands of surface parameters retrieved by passive microwave remote sensing. [0003] The microwave radiometer is an important part of the passive microwave remote sensing system, which receives the microwave radiation signals of various objects through the antenna. However, due to the influence of antenna radiation efficiency or main beam efficiency, the brightness temperature received by the microwave radiometer often includes the influence of surrounding interference targets, ...
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Login to View More IPC IPC(8): G01V13/00
CPCG01V13/00
Inventor 杨建卫李晓峰姜涛郑兴明李雷
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S