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Satellite Tracking Using a Portable 8” Satellite Tracking Using a Portable 8” Aperture TelescopeAperture Telescope
July 26, 2006
Jayson Nakakura
University of Hawaii at Manoa
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Trex Enterprises’ MauiTrex Enterprises’ Maui Kahului, Maui
Mentors– Riki Maeda and Daron Nishimoto
US Government Support– Defense– Homeland Security– Force Protection
Projects– CMOS Image Sensors– Adaptive Optics– Deployable Tracking Systems
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Deployable Tracking SystemDeployable Tracking System Why Track Satellites?
– Need to know satellite activity Friendly or Spy? What is it doing? Where is it looking?
– Quantity Many transportable telescopes Not dependent on observatories (i.e. AEOS)
Tracking with Low Residual Error– Keeping Satellites Centered in the Field of View (FOV) as they orbit
over head
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Conditions for SuccessConditions for Success
Deployable Tracking System
Mobility
Accuracy Resolution
Self Leveling
North Finding
GPS Enabled
High SlewSpeeds
Precise SatelliteOrbiting Data
LargeMirror
High SpeedCamera
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Meade LX200GPSMeade LX200GPS
8” Aperture(203 mm)
FocusF = 2000mm
8 x 50mm Viewfinder
•GPS Alignment System•True-Level Sensors•North Electronic Sensors
Slew Rate8° per second
Autostar II Control System
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Satellite TrackerSatellite Tracker
Satellite Tracker processes Two Line Element Sets (TLES) to predict satellite orbits. The telescope uses this data to point towards and slew with the passing satellite.
The predicted pass of COSMOS 1782
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Lunar Planetary Imager (LPI)Lunar Planetary Imager (LPI)
Color CMOS Chip with a640 x 480 pixel resolution
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LPI ImagingLPI Imaging
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Instantaneous Field of View (IFOV)Instantaneous Field of View (IFOV)
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AlbireoAlbireo
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Albireo - 3x MagnificationAlbireo - 3x Magnification
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Conditions for TrackingConditions for Tracking
Weather
Terminator– The time period when satellites reflect sunlight, making them visible
A few hours after sunset A few hours before sunrise
Satellite Magnitudes– Visibility of the satellites
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Finding Residual ErrorFinding Residual Error
•Take about 100 frames
•Find de-centered distances in arc-seconds
•Calculate average with a standard deviation
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Autostar IIAutostar II
Used for Manual Tracking
Controls telescope slew direction
Controls telescope slew speeds
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International Space Station (ISS)International Space Station (ISS)
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Tracking a PlaneTracking a Plane
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Average Residual ErrorAverage Residual Error
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ConclusionConclusion
Deployable Tracking System– With better software, it will successfully track satellites– With a much larger aperture, it should successfully image satellites
Is Satellite Tracking Feasible?
Yes No
•Able to slew with satellites•Able to manually track satellites•Able to image•Able to manually track planes
•Unable to center when using Satellite Tracker
Improvements?Satellite Tracker telescope controlling software
Time
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Thank YouThank You
Malika Moutawakkil Bell
Lisa Hunter Hilary O’Bryan
Riki Maeda
Daron Nishimoto Wes Friewald
Justin O’Brien
John Hirata Suzanne Burns
Uncle Kahu Charlie Kauluwehi Maxwell Sr.