AUTOMATIC DIRECTION FINDER SYSTEM PERFORMANCE ANALYSIS,
Abstract
Several airlines have expressed interest in increasing or maximizing the useable range of the ADF system thus implying that an increase in the quality factor of the sense antenna may be desirable. However, considerable uncertainty currently exists regarding what factor or factors constitute the primary limitation on the performance of the ADF system. There is no guarantee that an increase in ADF sense antenna quality factor would result in a corresponding improvement in overall ADF system performance. The major purpose of this report is to isolate the factors currently limiting system performance and to describe their characteristics. It is a corollary purpose to provide better definition of the ADF receiver's sense antenna input parameters and characteristics. The report first considers the various noise sources which may limit system sensitivity, treating in particular a technique for establishing the expected level of atmospheric noise which may be encountered in a given aeronautical service. Other noise sources are identified and their importance as performance limiting factors is discussed. Following this, measurements of the characteristics of ADF systems in use aboard current aircraft are set forth and discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 03, 1968
- Accession Number
- AD0670658
Entities
People
- K. E. Johnstone
Organizations
- Boeing Commercial Airplanes