A fully polarized microwave radiometer calibration device and calibration method thereof

A microwave radiometer and full polarization technology, applied in the field of microwave remote sensors, can solve the problems of large calibration system, phase delay plate impedance mismatch, error random error, etc., to reduce system error and random error, and reduce calibration Uncertainty, the effect of data processing simplification

Active Publication Date: 2015-10-07
NAT SPACE SCI CENT CAS
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Problems solved by technology

This fully polarized calibration source mainly has the following disadvantages in practical applications: ①The algorithm of the calibration equation is complex, and it is difficult to solve the parameter matrix; ②The frequency compatibility is poor, and the performance of the phase delay board varies greatly in each frequency band; Impedance mismatch and other problems, there are obvious reflection problems, resulting in large calibration system errors and random errors

Method used

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  • A fully polarized microwave radiometer calibration device and calibration method thereof
  • A fully polarized microwave radiometer calibration device and calibration method thereof
  • A fully polarized microwave radiometer calibration device and calibration method thereof

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Embodiment Construction

[0030] The present invention will be further described now in conjunction with accompanying drawing.

[0031] Fig. 2 (a) is the structure schematic diagram in an embodiment of the full polarization microwave radiometer calibration device of the present invention, and this calibration device comprises calibration heat source 2, calibration cold source 3, polarization separator 4 and phase Generator 5; wherein, the calibration cold source 3 is located on a horizontal plane, and the calibration heat source 2 is perpendicular to the horizontal plane; the polarization separator 4 is located between the calibration cold source 3 and the calibration heat source 2 and is connected to The horizontal plane is at an angle of 45 degrees; the phase generator 5 and the polarization separator 4 are at an angle of 90 degrees; during operation, the calibration heat source 2 and the calibration cold source 3 are fixed, and the pole The separator 4 can rotate around a central axis perpendicular ...

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Abstract

The invention relates to a complete-polarization microwave radiometer calibrating device which comprises a calibrating hot source, a calibrating cold source, a polarization separator and a phase generator. The calibrating hot source is arranged on a horizontal plane or a vertical plane, the plane where the calibrating cold source is arranged is perpendicular to the plane where the calibrating hot source is arranged, the polarization separator is arranged between the calibrating cold source and the calibrating hot source, the polarization separator forms an 45-degree angle with the horizontal plane, and the plane where the phase generator is arranged forms a certain angle with the plane where the polarization separator is arranged. The complete-polarization microwave radiometer calibrating device effectively reduces system errors and random errors and greatly reduces calibrating uncertainty.

Description

technical field [0001] The invention relates to the field of microwave remote sensors, in particular to a fully polarized microwave radiometer calibration device and a calibration method thereof. Background technique [0002] The full-polarization microwave radiometer is a new type of microwave remote sensor developed in the mid-1990s. Because it can measure all four Stokes parameters, it makes up for the existence of the traditional orthogonal polarization microwave radiometer in measuring the sea surface wind field. The fuzzy problem of wind direction has extremely important application value in the measurement and inversion of sea surface wind field, sea surface temperature, atmospheric water vapor content and liquid water content, land surface temperature and soil humidity. [0003] As a measuring instrument, the fully polarized microwave radiometer inevitably requires instrument calibration. Whether the full-polarization microwave radiometer can be calibrated convenien...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
Inventor 李彬王振占陆浩王新彪
Owner NAT SPACE SCI CENT CAS
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