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Basic foilset Visualization of Electromagnetic Application in CIV Project

Given by Don Leskiw,Geoffrey C. Fox at Rome Laboratory CIV Final Review on 9 April 98. Foils prepared 9 April 98
Outside Index Summary of Material

Background
Progress Since Last Meeting
NPAC/CIV Demonstration
  • Performance
  • Graphics

Table of Contents for full HTML of Visualization of Electromagnetic Application in CIV Project

 Denote Foils where Image Critical
Denote Foils where HTML is sufficient
1 Computational Electromagnetics for NPAC CIV Project
2 Outline
3 Background
4 Progress of Ultra RL Activity Since Last Meeting
5 Follow-On Ultra Corporation Activity
6 Demonstrations
7 Simulation of Cessna
8 Bistatic RCS
9 Example of Bistatic Cessna Results
10 Simulation of Flat-Plate
11 Example of Flat-Plate Bistatic Overlays

Outside Index Summary of Material

HTML version of Basic Foils prepared 9 April 98

Foil 1 Computational Electromagnetics for NPAC CIV Project

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
April 8, 1998
Presentation to RL by
Geoffrey C. Fox
HTML version of Basic Foils prepared 9 April 98

Foil 2 Outline

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Background
Progress Since Last Meeting
NPAC/CIV Demonstration
  • Performance
  • Graphics
HTML version of Basic Foils prepared 9 April 98

Foil 3 Background

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Objective
  • Provide dynamic and interactive radar cross section simulation for NPAC CIV project
Approach
  • Use new parallel GEMACS developed by Ultra Corporation under RL SBIR Phase 2 contract
GEMACS (General Electromagnetic Analysis of Complex Systems)
  • Used extensively for electromagnetic compatibility simulation by AF, Navy, Army
  • Full spectrum solutions (low-ƒ, high-ƒ, and hybrid)
HTML version of Basic Foils prepared 9 April 98

Foil 4 Progress of Ultra RL Activity Since Last Meeting

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Completed Parallelization of GEMACS
  • Full Parallelization of Complex Hybrid Problems
    • Electrically Large Sections Handled Via Unified Theory of Diffraction (Ray Tracing)
    • Electrically Small Sections Handled Via Method of Moments
  • Both Fully Coupled
HTML version of Basic Foils prepared 9 April 98

Foil 5 Follow-On Ultra Corporation Activity

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Subcontract to Decision-Support Associates to provide GEMACS analysis support
  • Airborne Communication Node variant to DARPA Global Hawk program
  • Very large scattering problems
  • Parallel GEMACS is unique as a hybrid-frequency analysis tool for electromagnetic interference problems
HTML version of Basic Foils prepared 9 April 98

Foil 6 Demonstrations

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Two cases
  • Cessna
  • Flat-Plate
Bistatic Radar Cross Section in 3D
  • Show bistatic field interactions on complex geometry (Cessna)
  • Show bistatic field dynamics as direction of source changes (Flat-Plate)
HTML version of Basic Foils prepared 9 April 98

Foil 7 Simulation of Cessna

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Calculation of far-field Bistatic RCS
  • Frequency = 1,275.0 MHz
  • Interaction orders: 1st and 2nd
  • No. of modeling elements = 19
  • No. GTD interaction points = 139
  • Source: nose-on (roll-axis)
  • Number of field points computed = 43,200
    • Yaw-plane: 0° to 360° in 1° steps
    • Pitch-plane: -60° to +60° in 1° steps
Total Execution Time = 9.48 hours on RL Paragon using 128 nodes (50.56 node-days)
HTML version of Basic Foils prepared 9 April 98

Foil 8 Bistatic RCS

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
HTML version of Basic Foils prepared 9 April 98

Foil 9 Example of Bistatic Cessna Results

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
HTML version of Basic Foils prepared 9 April 98

Foil 10 Simulation of Flat-Plate

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
Calculation of far-field Bistatic RCS
  • Frequency = 8,000 MHz
  • Interaction orders: 1st
  • No. of modeling elements = 1
  • No. GTD interaction points = 9
  • Both source and observer perpendicular to plate
  • Number of field points computed = 32,400
    • Source: from 0° to 360° in 2° steps
    • Bistatic observer: from 0° to 360° in 2° steps
Total Execution Time = 11.61 minutes on RL Paragon using 9 nodes (1.74 node-hours)
HTML version of Basic Foils prepared 9 April 98

Foil 11 Example of Flat-Plate Bistatic Overlays

From Visualization of Electromagnetic Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. *
Full HTML Index
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