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Small environment simulation calibration test device for microwave radiometer

A microwave radiometer and environmental simulation technology, applied in the direction of instruments, etc., can solve the problems of reducing the measurement accuracy of the microwave radiometer and the inability to obtain nonlinear calibration equations, etc., and achieve the effects of small footprint, simple structure and high precision

Pending Publication Date: 2020-06-26
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under normal circumstances, due to the limitation of calibration conditions, these two calibration methods are carried out at a fixed ambient temperature. Even if the environmental simulation test is carried out, the microwave receiver and the antenna are only tested separately The environmental simulation test cannot realize the calibration test of the whole machine environment simulation from the antenna port to the output end of the receiver, so that the accurate nonlinear calibration equation cannot be obtained, which reduces the measurement accuracy of the microwave radiometer

Method used

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  • Small environment simulation calibration test device for microwave radiometer

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specific Embodiment approach 1

[0021] Specific implementation mode one, the following combination figure 1 To illustrate this embodiment, a microwave radiometer small-scale environment simulation calibration test device described in this embodiment includes a small-scale environment temperature cycle simulation unit, a calibration source, a polyurethane door 9, an adjustable bracket 2 and a lifting frame 18;

[0022] The microwave radiometer 3 to be calibrated is connected to the antenna 7 and arranged inside the small ambient temperature cycle simulation unit, and the small ambient temperature cycle simulation unit provides a constant temperature environment for the microwave radiometer 3;

[0023] The mouth of the antenna 7 is aligned with the input mouth of the calibration source through the polyurethane door 9 set on the side of the small ambient temperature cycle simulation unit, and the adjustable bracket 2 is supported under the microwave radiometer 3 and is used to adjust the front and back of the mi...

specific Embodiment approach 2

[0028] Specific Embodiment 2: It should be further explained that in the range of 1-15 GHz, even in the case of clouds and moderate rainfall, the atmosphere is transparent. Especially for L and S-band microwave radiometers, they are basically free from atmospheric interference, and their atmospheric transmittance is close to 100%. Therefore, under clear sky conditions, open places such as roofs can be selected, and the cosmic background can be used as a cold source, and the light microwave radiometers in these two bands can be calibrated in the natural environment in the four seasons of spring, summer, autumn and winter.

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Abstract

The invention discloses a small environment simulation calibration test device for a microwave radiometer, belongs to the field of radiometer instrument measurement, and aims to solve the environmentsimulation calibration problem of a whole microwave radiometer and improve the measurement precision of a microwave radiometer. The test device comprises a small environment temperature cycle simulation unit, a calibration source, a polyurethane door, an adjustable bracket and a lifting frame, a microwave radiometer to be calibrated is connected with an antenna and is arranged in the small environment temperature cycle simulation unit, and the small environment temperature cycle simulation unit provides a constant temperature environment for the microwave radiometer; the opening surface of theantenna is aligned with the input opening surface of a calibration source through a polyurethane door arranged on the side surface of the small environmental temperature cycle simulation unit, and the adjustable bracket is supported below the microwave radiometer and is used for adjusting the front-back and left-right positions and the height of the microwave radiometer; and the lifting frame issupported below the calibration source and is used for adjusting the height of the calibration source so as to realize alignment of the calibration source and the antenna.

Description

technical field [0001] The invention belongs to the field of radiometer instrument measurement and relates to the radiometer calibration technology. Background technique [0002] The microwave radiometer is a high-sensitivity and high-stability receiver used to receive the weak microwave radiation power emitted by ground objects. The microwave brightness temperature received by the microwave radiometer can obtain the soil temperature, humidity, salinity, snow thickness, surface water salinity, such as bare soil or under vegetation cover, and then draw the surface water distribution map, land salinity It is an important means to solve problems such as flood forecasting, farmland moisture forecasting, vegetation biomass forecasting, crop yield estimation, irrigation planning, and meteorological modeling. [0003] The measurement accuracy of the microwave radiometer depends not only on the stability and sensitivity of the microwave radiometer, but also on the calibration accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 刘宝江宋开山
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S