Multimode Signal Prediction Algorithm Development
Abstract
This report presents a computationally-efficient algorithm based on full-wave waveguide-mode theory for predicting amplitude, phase, and modal interference-induced phase deviation (MIPD) of an Omega station signal for a given location and time. The signal along a path is approximated by a sum of the signal's first few, strongest-amplitude modes propagating in the earth- ionosphere waveguide formed along the signal path. An inhomogeneous signal path is modeled as a concatenation of a large number of homogeneous segments. For each segment, the algorithm determines the eigenvalue of each of the selected component modes of the multimode signal. The multimode signal propagation across the segment interfaces is determined by connecting the neighboring segment's mode signals using the IPP model's WKB approximation if the mode eigenvalues vary slowly across the interface; otherwise, using the FASTMC model's mode conversion approach. The resulting algorithm provides a reliable and cost- effective prediction of amplitude, phase and MIPD of an Omega stations signal for a given location and time. Keywords: Omega navigation system. (KR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1988
- Accession Number
- ADA215611
Entities
People
- Radha R. Gupta
Organizations
- TASC, Inc