Citation
Abstract
Deep-space mission data rates to Earth are limited by the system operating noise-temperature (T,,) performance of the DSN. This article addresses some of the techniques and definitions used for measuring and reporting the effective noise temperature of receivers (Te) and T., of the DSN’s ground receiving systems. Calibration loads are used to measure To, of the DSN antennas. At 32 GHz, a calibration load cooled to 2-K physical temperature requires a correction of 0.67 K to determine the noise temperature. Using corrected noise temperature for the calibration loads results in the correct values for Top such that the total system noise power can be defined by Pn = kT. B, as required for DSN telecommunications design control tables. To, and Te should not be converted to equivalent physical temperatures. (G/Top).
Details
- Volume
- 42-111
- Published
- November 15, 1992
- Pages
- 269–277
- File Size
- 315.2 KB