PERFORMANCE CHARACTERISTICS OF COMMUNICATION SYSTEMS EMPLOYING NEW SYNCHRONOUS (DCSP) SATELLITES.
OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
Pagination or Media Count:
For proper utilization and evaluation of communication satellites it is desirable to know their performance characteristics. These, together with the characteristics of the user station and of the propagating medium determine the total system performance. In this study experiments have been carried out for accurately calibrating a ground station by precisely measuring the gain of a thirty-foot paraboloidal reflector antenna, its power pattern, and its noise temperature, and the absolute level of the power due to receiver noise, and then using this accurately calibrated ground station for measuring the maximum ERP, power transfer and band-shape of DCSP satellites. In order to have good confidence in the accuracy of the results, independent measurement approaches were used. The antenna gain was measured by direct comparison with well-calibrated astronomy antennas through use of a radio star source and it was checked by use of experimentally generated antenna patterns. The maximum ERP was measured as a saturating CW tone was transmitted to the satellite. The power transfer and the band-shape of the satellite were obtained by measuring the variations in ERP as a function of input power and frequency, respectively. The polarization patterns of the satellite antennas were determined. The power spectral density curves of the amplitude scintillations in the signals were computed. Additionally, the beacon ERP and its variation as a function of input power were measured. A careful analysis was made of the effects of errors on the precision of the measurements. Author
- Unmanned Spacecraft
- Radio Communications