Accession Number : AD0645503

Title :   A STUDY LEADING TO THE CONSTRUCTION OF A TROPOSCATTER SIMULATOR.

Descriptive Note : Quarterly rept. no. 1, 1 Jul-30 Sep 66,

Corporate Author : COMMUNICATION SYSTEMS INC PARAMUS N J

Personal Author(s) : Klein,M. S. ; Harvey,J.

Report Date : DEC 1966

Pagination or Media Count : 50

Abstract : Main areas of effort included: (1) study of previous simulators to analyze possible approaches, (2) analysis of troposcatter data to determine a suitable range of parameters, (3) creation of computer techniques for simulating multipath, (4) investigation and development of hardware. The study indicates that a computer-controlled simulator, utilizing a tapped delay line approach, will yield the most flexibility and utility and the highest degree of freedom. The highest observed fade rates reported in the literature, due to aircraft doppler, were between 40 Hz and 60 Hz, and delay spread on 200-mile hops apparently has not exceeded 1 microsecond. Values for delay drift have yet to be determined but appear to be limited to 400 nanoseconds. Considerable insight into computer simulation of multipath was obtained, and a prototype program was evolved for controlling a delay matrix. Investigations into several electronically-controlled attenuator configurations yielded two very promising compact designs. A control network was tested, with satisfactory results. A study of possible delay line configurations was initiated. (Author)

Descriptors :   (*SIMULATORS, *MULTIPATH TRANSMISSION), TROPOSPHERE, SCATTERING, COMPUTERS, DELAY LINES, ATTENUATORS, CONTROL SYSTEMS, NETWORKS, MICROWAVE COMMUNICATIONS, SIMULATION

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE