Modeling the Antenna Configuration of a Digital Very-High Frequency (VHF) Direction Finding System
Abstract
The U.S. Coast Guard Academy (USCGA) has developed a prototype Digital Very High Frequency super-heterodyne Direction Finding system (DVHF-DF) in support of the U.S. Coast Guard's National Distress Response System Modernization Project (NDRSMP). This receiver, which processes four independent channels of in-phase (I) and quadrature (Q) data. offers significant advantages over more conventional receivers. Specifically, receivers that can archive separate channels of I and Q data can perform post-processed spatial filtering to enhance intelligibility of the demodulated signals, they can perform direction finding independently on two or more signals in the same frequency band originating from different directions, and they can use archived data to perform speaker and platform identification. thereby assisting in hoax determination. The central interest in this paper is a study of the antenna ray. Analysis of the array is presented for an array of isotropic radiators, and for a Numerical Electromagnetics Code (NEC) model of the individual elements in the configuration of the actual array. Comparisons of these arrangements are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2004
- Accession Number
- ADA431088
Entities
People
- Keith C. Gross
- Michael E. Mckaughan
- Richard J. Hartnett
Organizations
- United States Coast Guard Academy