INVESTIGATION OF CHAFF COMMUNICATIONS AT 4,650 MHZ.
Abstract
The purpose of Task IV was to obtain more experimental data on the behavior and parameters of a falling chaff communication channel especially at high altitudes (60-114 thousand feet), and to investigate those problem areas uncovered in Task III. The experimental work was performed at a frequency of 4650 MHz. Estimated coherent bandwidths on the order of 0.5-2 MHz, and fading bandwidth on the order of 5-40 Hz were observed. Drift rates and fall rates varied over a wide range depending on the point of deployment. Deployment altitudes in the vicinity of 65 thousand feet provided longer communication time than deployment at other altitudes. Theoretical studies include the effect of frequency separation in binary FSK, performance of error correcting codes with varying interleaving distances in a fading channel, influence of bit synchronization in a fading channel, and analysis of distortion in frequency selective channels including estimates of Noise Power Ratio (NPR). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0664124
Entities
People
- A. M. Bush
- D. D. Mcrae
- G. C. Clark
- R. C. Davis
- R. E. Totty