analysis on receiving performance degradation of ground station in lunar mission
- Paper number
IAC-09.A3.2INT.13
- Author
Mr. Durk-Jong Park, Korea Aerospace Research Institute, Korea, Republic of
- Year
2009
- Abstract
Ground station in lunar mission is responsible to receive telemetry signal including sensor data from lunar orbiter and/or lander. At preliminary stage of developing this ground station, receiving performance such as antenna size and noise temperature should be designed on the basis of link budget analysis. When the antenna of ground station is pointing to the moon to communicate with lunar orbiter and/or lander, noise level is supposed to be increasing due to the lunar flux density. It means that the moon is working as a noise source to degrade receiving performance of ground station. This paper presents a test configuration to measure the amount of noise contributed by lunar flux density. Through RF loop-back test with a coupling port of LNA (Low Noise Amplifier), signal-to-noise density ratio was measured by using calibrated measurement tools when antenna was pointing to the moon and cold sky in high elevation angle, respectively. To simulate telemetry signal received from lunar orbiter and/or lander, adequate signal level was applied into the coupling port of LNA in two different antenna pointing cases. Depending on test frequency (S-Band and X-Band) and antenna size (13m and 7.3m), the deviation of signal-to-noise density ratio was differently measured. Based on test results, this paper shows that noise induced by lunar flux density can be expressed as a function of antenna beam-width.
- Abstract document
- Manuscript document
IAC-09.A3.2INT.13.pdf (🔒 authorized access only).
To get the manuscript, please contact IAF Secretariat.