Title :
Measured Gain Improvement Characteristics of a Space Diversity Antenna System
Author_Institution :
Adv. Development Div. NASA Goddard Space Flight Center Greenbelt, Md.
Abstract :
A two-element adaptively phased array withelement gains of 18 dB was assembled andevaluated at 136 MHz. The gain improvementof the system over that of a single element wasmeasured while tracking ATS-C. The measuredgain improvement fell within 0.5 dB ofthe theoretical maximum 90 percent of thetime, corresponding to a normalized improvementof 2.5 dB for the two-element array. Athorough analysis of the AGC weighting processused in the system was made with particularemphasis placed on the effects of gainand noise figure variations between arraychannels.
Keywords :
Adaptive arrays; Antenna measurements; Extraterrestrial measurements; Gain measurement; Noise figure; Phase locked loops; Phased arrays; Preamplifiers; Radiofrequency amplifiers; Time measurement;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
DOI :
10.1109/TAES.1969.309887
