This paper details the EMC study conducted for the installation of a frequency-hopping VHF transceiver on board a U.S. Navy amphibious ship. The computational tools used for this analysis are described, including a "hybrid technique" which combines Method of Moments and Geometric Theory of Diffraction approaches to calculate VHF antenna-to-antenna coupling losses. Also, the compatibility evaluation of the RF system using the Cosite Analysis Model (COSAM) program in the frequency hopping mode is examined. Finally, a link analysis program which calculates ground wave and sky wave propagation losses is used to predict the range of the VHF radios with and without cosite interference.
The work described in this paper includes use of a bounded wave simulator at NRaD's Time Domain Measurement Range for obtaining the transient scattering response of a particular airbome target. The target used for these tests is a scale model, requiring that the measurement data be scaled in order to compare the results to those obtained by numerical methods for the full size target. The theory, measurement procedure, and data processing techniques are also presented.
Topside Antenna System Integration is one of the most important technology challenges for future Navy ship designs. This is due to dual mission requirements of increasing capability while reducing the overall signatures of a ship. Often these two goals are in conflict. Because of these conflicting design issues, new and innovative techniques are required. In order to maximize performance, accurate numerical modeling and simulation are required. By using modeling and simulation tools a thorough investigation of system performance can be obtained. This information can then be used to make informed design decisions. This paper describes the design procedure and engineering tools used for Navy topside antenna system integration. The approach is an iterative process by which topside designs and antenna system architectures can be analyzed and performance assessed.
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