Joint Test and Evaluation Summary of Greenland, Iceland (DYE 4 - DYE 5) Troposcatter Radio Link
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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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. BTLs techniques consisted of angle diversity and a pre-detection combiner called FALC C and Ss technique was that of adaptive FM and Raytheons 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 FMFDM system. Test results indicated that although both the test system and the normal-operational FMFDM system performed rather poorly, the better performance was achieved most of the time by the operational FMFDM system. There were also instances when propagation outrage conditions occurred in the operational FMFDM 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.
- Radio Communications