Joint Test and Evaluation Summary of Greenland, Iceland (DYE 4 - DYE 5) Troposcatter Radio Link
Abstract
The purpose of the tests was to evaluate techniques such as angle diversity, pre-detection diversity combining, and adaptive FM as possible means of improving the operational performance of that link. BTL's techniques consisted of angle diversity and a pre-detection combiner called 'FALC'; C and S's technique was that of adaptive FM; and Raytheon's technique was a predetection combiner called 'PDC.' This report describes the joint tests and the evaluation which was performed during March and April 1968 when the above- mentioned techniques were integrated into a single entity and compared to the normal-operational FM/FDM system. Test results indicated that although both the test system and the normal-operational FM/FDM system performed rather poorly, the better performance was achieved most of the time by the operational FM/FDM system. There were also instances when propagation outrage conditions occurred in the operational FM/FDM system but not in the test system. During such periods, the improved performance of the test system was attributed to its angle diversity aspects rather than to its pre-detection combining or adaptive FM aspects. It is also shown that the adaptive FM technique degrades the test system when the system also includes the FALC pre-detection combiner.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0857278
Entities
People
- Frank P. Chiffy
- Italo A. Fantera
Organizations
- Rome Laboratory