data mining for meteor echoes using high power uhf … lincoln lab meteor processor pulse/threshold...
TRANSCRIPT
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● Introduction● Lincoln Lab Meteor
Processor● Pulse/Threshold ● August 7, 2003
Results
Kristen FrazierCornell University
Mentor: Phil Erickson
August 7, 2003
Data Mining for Meteor Echoes Using High Power UHF Radar
● Introduction● Lincoln Lab Meteor
Processor● Pulse/Threshold ● August 7, 2003
Results
Kristen FrazierCornell University
Mentor: Phil Erickson
August 7, 2003
![Page 2: Data Mining for Meteor Echoes Using High Power UHF … Lincoln Lab Meteor Processor Pulse/Threshold August 7, 2003 Results Kristen Frazier Cornell University Mentor: Phil Erickson](https://reader031.vdocuments.mx/reader031/viewer/2022022006/5abf69e37f8b9ac0598e5eb6/html5/thumbnails/2.jpg)
Local Sunrise
Orbit
IntroductionMicrometeors
- 10-5 – 10-4 m2
SporadicDetected at 90-140 km<Microsecond Duration
Micrometeor
Incoherent Scatter Radars
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3) IONIZED PLASMA5
) Alti
tude
Ran
ge (k
m)
90 km
140 km
1) MICROMETEOR
2) ABLATED ATOMS
4) 'HEAD ECHO' DETECTED
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Translation Program“nrs_reformat”
RAW DATA Meteor ProcessorNASA Meteor Project
-Millstone Hill Collaboration-A. Coster, S. Close
Meteor Processor Program-D. Durand
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Raw Data Sample
Single Meteor Streak
Single Meteor Streak
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Color Indicates AmplitudeRadar Clutter From White Mountains
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1
2
Pulse Length: 40 microseconds
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Raw Data Sample
Double Meteor Streak
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VS.
VS.
Single
Pulse Wave Form Results
VS.
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2.00
3.00Best Results: 2.00 – 3.25Manually ChangedGate Index = 15
Threshold Results
239 Meteors Logged68 Visibly Detectable30 Manually Tagged
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Conclusions
• Why Double/Single Streak Phenomenon? • Why is There Such a Difference in the Log vs. Plots• Would Different Thresholding Give Better Results?
Questions:
Peak Range Rate: 50 – 60 km/secPeak Mean Altitude: 106-108 kmDuration: 50-100 millisecondsPeak Correlation Coefficient: -1
Statistics:
239 Meteors Logged
68 Visibly Detected
30 Manually Tagged
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Acknowledgments