A calibration system and method for a synthetic aperture phased array microwave radiometer
A microwave radiometer and synthetic aperture technology, applied in the field of microwave remote sensing, can solve the problems of complex calibration system, low measurement efficiency, error measurement and calibration work, etc., and achieve the effects of high calculation accuracy, clear structure and simple operation
Active Publication Date: 2021-06-11
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
[0004] The technical problem solved by the present invention is: in view of the current prior art, the calibration of the comprehensive aperture phased array microwave radiometer system is to perform error measurement and calibration work on each channel separately, resulting in complex calibration system and difficult measurement. In order to solve the problem of low efficiency, a calibration system and method for synthetic aperture phased array microwave radiometers was proposed.
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[0050] A calibration system and method for a synthetic aperture phased array microwave radiometer, the calibration system includes three parts, such as figure 1 As shown, they are the phased antenna array module, the cold and heat source calibration module, and the synthetic aperture module. Among them, the functions of each module are as follows:
[0051] Phased antenna array module: including M groups of phased array networks, each group includes N-way phased array antennas, according to the external antenna selection to receive observation scene signals or noise signals or matching load signals, for each group of phased array network one way The signal received by the phased array antenna is switched, so that the type of signal received by the phased array antenna is different from the signal received by other phased array antennas in the group, and the group is used as a unit to output to the cold and heat source calibration module Modify the received signal type and simul...
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A calibration system and method for a synthetic aperture phased array microwave radiometer, which is used to measure and correct the error caused by the amplifier gain and channel noise brightness temperature of each channel of the synthetic aperture phased array microwave radiometer system, and improve The measurement accuracy of the system improves the quality of imaging results. This method makes up for the complex calibration system and low measurement efficiency of the current integrated aperture phased array microwave radiometer, and solves the problem of high-precision quantitative measurement of the integrated aperture phased array microwave radiometer system. The calibration scheme has the advantages of simplicity, high reliability, and high measurement efficiency.
Description
technical field [0001] The invention relates to a calibration system and method for a synthetic aperture phased array microwave radiometer, belonging to the field of microwave remote sensing. Background technique [0002] According to the thermal radiation theory, any object with a temperature above absolute zero will radiate electromagnetic waves outward. This radiation is generated by the object itself, rather than a direct reflection of external energy. We call the electromagnetic waves radiated by objects in the microwave frequency band microwave radiation signals. A device that uses microwave radiation signals to identify, analyze and extract required information is called a microwave radiometer. Synthetic aperture phased array microwave radiometer is a kind of microwave radiation detection system. Its one dimension adopts synthetic aperture technology, and the other dimension realizes two-dimensional imaging through phased array technology. It has a small-scale digita...
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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 王佳坤李一楠董坚党鹏举宋广南杨小娇沈尚宇李鹏飞卢海梁
Owner XIAN INSTITUE OF SPACE RADIO TECH