INVESTIGATION OF CHAFF COMMUNICATIONS AT 5,000 MCPS.
Final rept. 1 Dec-31 May 63,
RADIATION INC MELBOURNE FLA
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An experimental and theoretical program was carried out to investigate the use of chaff for communication beyond the line-of-sight. The objectives of this program were to formulate a test plan and to specify equipment for collecting data over a two terminal chaff communication system. The theoretical program included investigations of bistatic scattering cross section for chaff clouds, bandwidth and modulation effects, diversity performance, acquisition and tacking requirements and optimum antenna sizes. In the experimental program, field tests were conducted at 5 gigacycles. The experimental system consisted of a 5.652 gigacycles transmitter and a 4channel receiver. A radar was used for measuring the chaff cloud tracking angles, chaff cloud configuration, fall rate, and drift rate. A 10 lb. chaff unit was dispensed over the receiver site by an aircraft. The measured values of cross section agreed with the predicted values to within the experimental error. The predicted cross section is a function of the orientation of the dipoles. As was anticipated, the orientation of the short 5 gigacycles dipoles was found to be horizontal. Author