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Internal and external calibration method used for radiometer imaging

A radiometer and internal calibration technology, applied in the field of internal and external calibration of radiometer imaging, can solve the problems of complex test equipment and test environment, long test time, and low efficiency

Active Publication Date: 2018-05-04
BEIJING INST OF REMOTE SENSING EQUIP
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Problems solved by technology

[0003] The purpose of the present invention is to provide an internal and external calibration method for radiometer imaging, which solves the problems of complex test equipment and test environment, high requirements for radiation source temperature consistency, long test time and low efficiency in previous methods

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  • Internal and external calibration method used for radiometer imaging

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Embodiment Construction

[0052] The specific steps of an internal and external calibration method for radiometer imaging are:

[0053] The first step is to build an internal and external calibration system

[0054] Internal and external calibration system, including: system frame device 1, quasi-optical device 2, radiometer array device 3, radiometer array calibration device 4, data collector 5, data processor 6, electronic control device 7 and display control module 8 .

[0055] The system frame device 1 provides structural support; the electric control device 7 is connected with the quasi-optical device 2 and the radiometer array calibration device 4; the output end of the radiometer array device 3 is connected with the signal input end of the data collector 5; The output end is connected to the signal input end of the data processor 6; the signal output end of the data processor 6 is connected to the signal input end of the display control module 8.

[0056] The functions of the display and contr...

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Abstract

Disclosed is an internal and external calibration method used for radiometer imaging. An internal and external calibration system comprises a system frame device (1), a quasi optical device (2), a radiometer array device (3), a radiometer array calibration device (4), a data collector (5), a data processor (6), an electric control device (7) and a display control module (8). Among the devices, a millimeter wave focal plane array imaging technology is employed, radiometers and feed source antenna arrays are utilized to cover a horizontal field of view and reflector mechanic scanning is utilizedto cover a vertical field of view, and the resolution of a near field imaging space is increased through ellipsoidal focusing antennas. Through the radiometer array calibration device (4) among the devices, the effect and the precision of radiometer imaging can be improved firstly in an internal calibration way and then in an external calibration way. Compared with conventional radiometer calibration methods, the method of the invention has the advantages that the testing efficiency is high, great image effects are provided, the precision is high, etc.

Description

technical field [0001] The invention relates to an internal and external calibration method, in particular to an internal and external calibration method for radiometer imaging. Background technique [0002] At present, the calibration of microwave radiometers mostly adopts the two-point calibration method. If the linearity of the microwave radiometer receiver can be guaranteed, then the two-point calibration method that can be used based on the principle of determining a straight line by two points has the disadvantages of complicated operation and limited accuracy in implementation. This measurement method generally selects a high temperature point and a low temperature point of the same standard body to complete the test process. When switching temperatures, it requires a long transition and stabilization time. In addition, due to the heating or cooling method and material structure problems It is difficult to achieve good temperature uniformity. Since it is an open tes...

Claims

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Application Information

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IPC IPC(8): G01S13/89G01S7/40
CPCG01S7/40G01S13/89
Inventor 吴海涵赵崇辉崔广斌向巍
Owner BEIJING INST OF REMOTE SENSING EQUIP
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