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
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE