A Phase Calibration Method for Rotating Sampling Synthetic Aperture Radiometer

A comprehensive aperture, rotating sampling technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, instruments, etc., can solve the problems of 180° phase ambiguity, slow solution speed, not considering inseparable phase errors, etc. Acquiring, high phase scaling speed, quick and easy steps

Active Publication Date: 2021-04-09
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the existing synthetic aperture radiometer external phase calibration method does not consider the inseparable phase error, the phase error solution result has 180° phase ambiguity, and the solution speed is slow, so as to effectively improve the large-scale rotation sampling system. Phase Calibration Accuracy and Phase Error Solution Speed ​​of Synthetic Aperture Radiometer

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  • A Phase Calibration Method for Rotating Sampling Synthetic Aperture Radiometer
  • A Phase Calibration Method for Rotating Sampling Synthetic Aperture Radiometer
  • A Phase Calibration Method for Rotating Sampling Synthetic Aperture Radiometer

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[0047] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0048] like figure 1 As shown, the present invention provides a method for phase calibration of a rotating sampling synthetic aperture radiometer, the method comprising:

[0049] Step 101) use the synthetic aperture radiometer to be calibrated to perform rotational sampling on a certain brightness temperature center-symmetrical observation target (such as the sun or a noise point source) to obtain each relevant baseline visibility function measurement value;

[0050] Step 201) Use each relevant baseline visibility function measurement value obtained in step 101), according to the visibility function phase characteristic of the brightness temperature center symmetrical observation target, or the direct brightness temperature reconstruction result of the visibility function measurement value, calculate the fixed value under the observation scene. Standar...

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Abstract

The present invention disclosed a method of rotating sampling comprehensive aperture radiation meter fixation method, including: using the comprehensive aperture radiation meter to be defined to be targeted to a bright and temperature center symmetrical observation target to obtain the visible function measurement value of the relevant baseline;The phase execution correction step of the visible degree function measurement value of any related baseline: extract the measurement value of the visible function of the relevant base line at the fixed standard sampling angle, and the difference between the phase of the visible function measurement value and the corresponding aspect of the benchmark benchmark phase phase phase.As a phase error of the visible function measurement value of this related baseline; use the phase error to correct the phase of the visible function measurement value of the related baseline.This method does not rely on the additional bidding device, does not need to solve the complex matrix equation, there is no problem of 180 ° phase blur problems, it has the advantages of simple operation, fast calculation speed, and high accuracy of the standard.Sampling comprehensive aperture radiation meter.

Description

technical field [0001] The invention relates to the field of rotary sampling synthetic aperture radiometers, in particular to a phase calibration method of rotary sampling synthetic aperture radiometers. Background technique [0002] Synthetic aperture radiometer is one of the main technical means to realize microwave radiation measurement in the field of passive microwave remote sensing. The system obtains the visibility function by measuring the spatial frequency domain distribution of the brightness temperature of the observed scene. Then, using the Fourier transform relationship between the brightness temperature distribution of the observed scene and the visibility function, the brightness temperature distribution of the observed scene is reconstructed. Compared with the real aperture radiometer, the synthetic aperture technology sparses the large-diameter real-aperture antenna into a small antenna array, which can effectively reduce the physical size of the actual ant...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/90
Inventor 郭曦刘浩张成吴季
Owner NAT SPACE SCI CENT CAS
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