FREQUENCY ASSIGNMENT STUDIES.
Quarterly progress rept. no. 3, 1 Feb-30 Apr 66.
ELECTRO TECHNICAL ANALYSIS CORP TUCSON ARIZ
Pagination or Media Count:
This is a study to improve electromagnetic compatibility in the field army through development of frequency assignment practices. Further practical aspects of the exclusion and bookkeeping charts involving use of the exclusion template are considered. An improved template is described which reduces by a factor of two the effort required to prepare exclusion charts. A simplified process of recording exclusion data on plastic strips facilitates establishment of the bookkeeping chart and solution of assignment problems. Radio net interference is classified into on-site, adjacent-channel and co-channel problems. The basic framework required for a probabilistic receiver model is discussed. Probabilistic considerations in modeling a single receiver are considered. Several existing receiver modules are examined, and it is found that none of the models gives a true probabilistic picture of receiver action. It is established that two distributions are of importance a short-term distribution in phase, and a long-term distribution in amplitude of received signals. It is shown that in many cases little realism will be lost if all signals are computed on a completely deterministic basis up to the i-f output. The problem thus is reduced to a probabilistic calculation of the output of an ensemble of signals impressed on a demodulator.
- Radio Communications