THE ANALYSIS OF ADVANCED SYNCHRONOUS TELEMETRY TECHNIQUES.
TRW SPACE TECHNOLOGY LABS LOS ANGELES CALIF
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This report presents the results of a theoretical analysis of an advanced synchronous PCM telemetry system. The system, called carrier-lock, utilizes a bit-rate that is synchronous with the carrier to retain bit, word, and frame synchronization alone when the signal strength drops to a level too low to permit such synchronization to maintained by conventional means. The absolute performance of this system is determined and compared with the performance or a standard PCM telemetry system. The results of a study of typical signal strength records from various Ballistic Missile flights are also presented. The results of the comparison of the two methods of obtaining bit-sync when viewed in the light of the signal strength records, indicate that the synchronous telemetry system has major advantages for those systems in which a digit error rate of 10 to the -1 or higher can be tolerated. Thus with the advant of more complex PCM encoding such as orthogonal, simplex, or redundant error correction codes, the carrier lock system looks most promising. Author