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A device and method for four-point calibration of a microwave radiometer

A microwave radiometer and four-point calibration technology, which is applied to measuring devices, instruments, and measuring electrical variables, etc., can solve problems such as large calibration errors, achieve small requirements for the use environment, improve calibration accuracy, and improve measurement efficiency and The effect of calibration efficiency

Active Publication Date: 2017-12-29
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0005] The object of the present invention is to solve the technical problem that the existing two-point calibration of microwave radiometers leads to large calibration errors. The present invention proposes a device and method for four-point calibration of microwave radiometers.

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  • A device and method for four-point calibration of a microwave radiometer
  • A device and method for four-point calibration of a microwave radiometer
  • A device and method for four-point calibration of a microwave radiometer

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Embodiment Construction

[0038] A device and method for four-point calibration of a microwave radiometer according to the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0039]A device for four-point calibration of a microwave radiometer of the present invention comprises: a rotary table, an external calibration heat source, an external calibration cold source and an internal calibration unit; the rotary table rotates along a vertical plane, The external heat source and the external cold source are fixed in two directions at the center of the rotary table, and are respectively used to provide external calibration high temperature calibration points and external calibration low temperature calibration points, and the microwave radiometer is fixed on the rotary table and rotate synchronously with the turntable, while making the antenna of the microwave radiometer point to the center of the turntable at all times; the internal calibratio...

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Abstract

The invention provides a four-point scaling device and method for a microwave radiometer. A four-point scaling technology is used in the method, a high-temperature reference point and a normal-temperature reference point are arranged in the microwave radiometer to carry out internal scaling on a receiver of the microwave radiometer, and a normal-temperature scaling source and a cold air reference source are arranged outside the microwave radiometer to carry out external scaling on the whole microwave radiometer with an antenna. The device is provided with a special-purposed radiator scaling turntable, and reasonably distributes scaling and observation intervals of the microwave radiometer, so that real-time four-point scaling can be carried out on the microwave radiometer in each observation period, and a high-precision scaling result of the microwave radiometer can be obtained.

Description

technical field [0001] The invention belongs to the technical field of calibration of microwave radiometers, and in particular relates to a device and method for four-point calibration of microwave radiometers. Background technique [0002] With the in-depth development and wide application of remote sensing technology, microwave remote sensing has become a key research and development field in all countries in the world. As a passive microwave remote sensing instrument, the microwave radiometer obtains the feature information of the ground features by receiving the microwave radiation of the ground features itself. It occupies a particularly important position in the field of remote sensing; at the same time, microwave radiometers can obtain target information in multiple frequency bands, multi-polarizations, and multiple perspectives, and have developed into an important means of earth observation, atmospheric, marine environment monitoring, and space detection. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 王振占董帅李彬陆浩刘璟怡
Owner NAT SPACE SCI CENT CAS
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