Accession Number : AD0435539


Title :   MILLIMETER TECHNIQUE EVALUATION OF GUIDANCE DATA ATTENUATION BY EXHAUST PLUMES,


Corporate Author : ARMY MISSILE COMMAND REDSTONE ARSENAL ALA ADVANCED SENSORS LAB


Personal Author(s) : Green,Augustus H ,Jr


Report Date : 26 Mar 1964


Pagination or Media Count : 37


Abstract : Maintaining re3iable communications between a missile in flight and ground-based communications equipment is a problem which is becoming more crucial as systems concepts and techniques advance and electromagnetic environment increases in complexity. A major difficulty encountered is signal loss caused by the ionization characteristics of the rocket exhaust (plasma). Many developmental systems, whether employing small or large motors, are affected by this pr6blem. The interaction of a plasma with an electromagnetic wave is related to three essential parameters: (1) the collision frequency of free electrons with neutral particles, (2) the free electron density, and (3) the frequency of the electromagnetic wave. The propagation constant is a function of the attenuation constant and the phase constant which are related to the three parameters. An analysis of these parameters is essential to achieving and understanding of signal propagation through a plasma. By measuring the attenuation constant and the phase constant at selected frequencies, the collision frequency and the electron density may be determined. (Author)


Descriptors :   *EXHAUST FLAMES , *RADIO SIGNALS , *MILLIMETER WAVES , GUIDANCE , ATTENUATION , ATTENUATION , ELECTROMAGNETIC RADIATION , COMMUNICATION EQUIPMENT , GAS IONIZATION , ROCKETS , PLASMAS(PHYSICS) , PROPAGATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE