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http://dx.doi.org/10.5139/JKSAS.2022.50.9.657

The calculation and Measurement Methods for G/T of the Telemetry Small Aperture Antenna  

Kim, Chun-Won (Korea Aerospace Research Institute)
An, Na-Gyun (Korea Aerospace Research Institute)
Kim, Dong-Hyun (Korea Aerospace Research Institute)
Cho, Byung-Lok (Sunchon National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.50, no.9, 2022 , pp. 657-662 More about this Journal
Abstract
In this paper, the calculation using simulation and two measurement methods for G/T of the telemetry are analyzed. Antenna gain and noise temperature are calculated by using ICARA and Antenna Noise Temperature Calculator. System G/T were calculated by using Antenna gain/noise temperature, LNA gain/noise temperature, cable loss. The first G/T measurement method is Y-factor measurement method, which is to calculate G/T by comparing LNA noise temperature and a signal level difference when an antenna and a 50ohm termination are respectively connected to an LNA input terminal Second method is Solar calibration measurement method that is to calculate G/T by comparing noise level difference when looking at the sun and lowest level point. Finally, the accuracy was reviewed by comparing the G/T calculation results with the two measurement methods, and the optimal measurement method according to antenna performance and operating environment was presented.
Keywords
Receiver G/T; Antenna Noise Temperature; Y Factor Method; Solar Calibration Method;
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  • Reference
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