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Integrity Service Excellence
Physical Scintillation Simulation
Diffraction Grating-Based
GPS Physical Scintillation Simulation Results
Kirtland AFB, NM
19 June2012
Dr. Todd Pedersen Capt. Melanie Huffman
Mr. R. Todd Parris
AFRL, Space Vehicles Directorate, Kirtland AFB, NM
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•Attempt to simulate ionospheric scintillation and nav
outages by physically altering live GPS signal•2-D L-band diffraction gratings created out of metallic
wire “field fence” with holes 12” wide by 4”-12” high
(graduated spacing, wide at top, narrow at bottom)– One curved panel approx 6’ long– One cylinder approx 3’ diameter x 4.5’ high– Waved over antenna on rooftop
•2 Ashtech Z-12 receivers connected to same
antenna via splitter– Test of receiver-specific effects or power level