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Basic foilset Electromagnetic Application

Given by Don Leskiw(Ultra Corporation) at Rome Laboratory CIV Quarterly Review on 24 February 97. Foils prepared 23 February 97
Outside Index Summary of Material

Background
Parallel GEMACS Status
NPAC/CIV Demonstration
  • Performance
  • Graphics

Table of Contents for full HTML of Electromagnetic Application

 Denote Foils where Image Critical
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1 Computational Electromagnetics for NPAC CIV Project
2 Outline
3 Background
4 Parallel GEMACS Status
5 Demonstrations
6 Simulation of Cessna
7 Example of Bistatic Cessna Results
8 Simulation of Flat-Plate
9 Example of Flat-Plate Bistatic Overlays
10 Options
11 Notional Global Hawk Placement

Outside Index Summary of Material

HTML version of Basic Foils prepared 23 February 97

Foil 1 Computational Electromagnetics for NPAC CIV Project

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
Presentation to RL by
Donald M. Leskiw
24 February 1997
HTML version of Basic Foils prepared 23 February 97

Foil 2 Outline

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
Background
Parallel GEMACS Status
NPAC/CIV Demonstration
  • Performance
  • Graphics
HTML version of Basic Foils prepared 23 February 97

Foil 3 Background

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
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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 23 February 97

Foil 4 Parallel GEMACS Status

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
Geometric Theory of Diffraction (GTD) parallelization complete — high-ƒ
Method of Moments (MOM) parallelization in progress — low-ƒ
  • Initial results
  • Demo to RL/ERST scheduled for next quarter
  • Also, hybrid (low-/high-ƒ) capability
Other module (APATCH) being looked at
HTML version of Basic Foils prepared 23 February 97

Foil 5 Demonstrations

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
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 23 February 97

Foil 6 Simulation of Cessna

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
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 23 February 97

Foil 7 Example of Bistatic Cessna Results

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
HTML version of Basic Foils prepared 23 February 97

Foil 8 Simulation of Flat-Plate

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
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 23 February 97

Foil 9 Example of Flat-Plate Bistatic Overlays

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
HTML version of Basic Foils prepared 23 February 97

Foil 10 Options

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
Simulation of Currents on AWACS with respect to rotodome dynamics
  • Integration of APATCH with GEMACS
  • Requires no-cost extension to Ultra SBIR
Electromagnetic Compatibility Analysis of Global Hawk Airborne Communication Node Variant
  • Work to begin this spring
  • See next slide
HTML version of Basic Foils prepared 23 February 97

Foil 11 Notional Global Hawk Placement

From Electromagnetic Application Rome Laboratory CIV Quarterly Review -- 24 February 97. *
Full HTML Index
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