Data Analysis of Echo I, II and the Moon. Volume II. Power Spectral Density Analysis of Passive Satellite Reflected Signals

摘要

This report deals with the power spectral density of passive satellite (Echo I, Echo II, and Moon) reflected signals. The prime objective is to present the power spectral density curves of pulsed cw and cw-type signals reflected by Echo II during selected passes of its first 2000 revolutions. Comparisons are made between the spectra of various types of signals reflected by the same satellite; between the spectrum of the same signal reflected by the various satellites; and between the spectrum of the same signal reflected by the same satellite in various path geometries. The conclusions are based on the available data and show that the spectrum of a signal reflected by Echo I differs only negligibly from that of Echo II, while the moon data exhibit details ascribable to considerably more surface roughness than either artificial satellite. The spectrum from Echo II indicate that possible deterioration is resulting in increased surface roughness of the satellite and that the path geometry possibly influences the data. (Author)