Accession Number : AD0775741
Title : A Simple Method of Simulating Motion and Plasma Induced Variations in the Attenuation of Signals Transmitted from Reentry Vehicles.
Descriptive Note : Instrumentation papers,
Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Personal Author(s) : Poirier,J. L. ; Tropea,D. H.
Report Date : 17 OCT 1973
Pagination or Media Count : 24
Abstract : A simple method of simulating the variation in the amplitude of microwave signals from rocket-borne transmitters is presented. The technique reproduces signal changes caused by vehicle motion as well as those induced by plasma effects. The simulator uses a voltage controlled attenuator which is programmed to vary the output power of a test transmitter to produce the variations in signal amplitude which would be observed during a flight. An analog system which is suitable for variations of simple cyclical shape and a digital simulator which can reproduce changes of any complexity are presented. Use of the simulator before flight allows the dynamic behavior of a microwave link to be determined, permits optimum receiver and recorder parameters to be selected, increases operator confidence, and enhances flight test reliability. (Author)
Descriptors : *Atmosphere entry, *Radio transmission, *Reentry vehicles, Simulation, Plasma sheaths, Simulators, Radio signals, Attenuation, Microwaves
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE