Ultra-wideband receiver technology development for radio astronomical large aperture telescope

Chen, MaoZheng; Liu, Qi; Ma, Jun; Wang, Na

doi:10.1360/sspma2016-00505

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…e microwave receiver is the receiving equipment specially used to receive radio signal in the radio telescope system [2]. e radio signal is reflected and focused by the radio telescope to phase center of the feed [3], and it is then transmitted to the receiver through the low noise amplifier (LNA) and filter, after mixing with the local oscillator (LO) signal and other related processing, and the intermediate frequency (IF) signal is finally transmitted to the data terminal and processed [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method

Wang

Chen

et al. 2020

Advances in Astronomy

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The receiver is a signal receiving device in a radio telescope system. As an important parameter to characterize the receiver performance, noise temperature is very practical to calibrate accurately. The traditional receiver noise temperature calibration method is the cold and ambient load method. Through the establishment of K-band ambient receiver, and its amplitude calibration test platform of the cold and ambient load method, chopper wheel method, and ambient and hot load method, comparison and analysis of the above three methods were carried out. The test and calculation results show that the test accuracy of the cold and ambient load method is about 1.3%, that of the chopper wheel method (nonlow elevation) is about 3%, and that of the ambient and hot load method is about 9%. The test accuracy of the ambient and hot load method is slightly lower than that of the above two methods. The analysis is mainly due to the uncertainty of the hot load temperature and the small temperature difference between the two loads, which leads to the deterioration of the overall accuracy. But the advantage is that the method can perform real-time calibration in the process of observation, and it is easier to implement than the traditional cold and ambient load method. The results of noise temperature measurement are compared with those of theoretical calculation, the error is basically within 10%, and it can satisfy the demand of the noise temperature test. In the future, we expect that on the basis of increasing the hot load temperature, further experiments were carried out on the thermostatic treatment of hot load and the accuracy of temperature acquisition, and finally we hope that this method can better meet the testing requirements of receiver noise temperature and radio source amplitude calibration.

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Section: Introductionmentioning

confidence: 99%

Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method

Wang

Chen

et al. 2020

Advances in Astronomy

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“…The microwave receiver is a device which collects the electromagnetic wave signal from the telescope and amplifies the radio frequency(RF) signal through a low noise amplifier(LNA) [1,2], and then outputs it to backend after mixing, intermediate frequency(IF) amplification and filtering [3]. Because the signals received in radio astronomical observation are extremely weak, the sensitivity of receiver is highly demanded for radio telescope [4].…”

Section: Introductionmentioning

confidence: 99%

The Design of Public Aerating System

Wang¹,

Chen²,

Xiang³

et al. 2019

dtcse

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Microwave receiver system is signal receiving equipment in radio astronomical observation. Through refrigeration, we can greatly reduce the noise temperature of receiver, but the dewar has more than 200 K temperature difference between inside and outside, and the vapor will freeze on the surface of vacuum window to effect observation. The aerating system is a pneumatic control system, it supplies dry air and exhausts old for dry air cavity of receiver. Three cryogenic receivers of Nanshan 26 m radio telescope were equipped with aerating systems, but they were independent each other. The public aerating system could not only realize to supply dry air for three cavities, but also had a simpler structure with only one inflator. Compared with the test results of original systems, the public aerating system could make the pressure of each cavity more stable, and keep dry for each vacuum window of cryogenic receivers very well.

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Noise Temperature Measurement System of Normal and High Temperature Load Method

Wang

Chen

et al. 2019

J. Phys.: Conf. Ser.

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Microwave receiver is a special equipment used to receive radio signals in radio telescope. The noise temperature of receiver is an important target to test sensitivity. The lower the noise temperature is, the higher the sensitivity is. Therefore, the measurement of noise temperature is very important. The classical cold and ambient load method can measure noise temperature well, but it can not be carried out during observation. In addition, the performance of microwave devices is not unchanged, and noise temperature will vary with the ambient temperature and test equipment, so real-time measurement of noise temperature is important. We set up a noise temperature measurement system based on normal and high temperature load method. Through this system, noise temperature can be calculated by measuring the radiation power and temperature of blackbody at normal temperature and after heating to 150°C. Compared with results of the cold and ambient load method, the maximum test error is 12.3% in five tests, and the other test errors are less than 10%. The results can confirm that the normal and high temperature load method could be hopeful to satisfy the normal test requirements of centimeter-band normal temperature receiver.

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Ultra-wideband receiver technology development for radio astronomical large aperture telescope

Cited by 7 publications

References 26 publications

Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method

Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method

The Design of Public Aerating System

Noise Temperature Measurement System of Normal and High Temperature Load Method

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