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Task Force

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Vectorized code has d load/stores and (d log d) extract/interleaves ... Position of gaps affects the number of extract (interleaves) needed ... – PowerPoint PPT presentation

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Title: Task Force


1
  • Task Force
  • On
  • The Future of the Global Positioning System
  • (extract)

2
National PNT Objectives
  • Provide uninterrupted availability of
    positioning, navigation, and timing services
  • Meet growing national, homeland, economic
    security, and civil requirements, and scientific
    and commercial demands
  • Remain the pre-eminent military space-based
    positioning, navigation, and timing service
  • Continue to provide civil services that exceed or
    are competitive with foreign civil space-based
    positioning, navigation, and timing services and
    augmentation systems
  • Remain essential components of internationally
    accepted positioning, navigation, and timing
    services
  • Promote U.S. technological leadership in
    applications involving space-based positioning,
    navigation, and timing services

Source U.S. Space-based Positioning,
Navigation, and Timing Policy, NSPD Signed by
President Bush, 15 December 2004
3
Salient Points from Task Force
  • The service provided to users is crucialnot
    sub-optimizing the satellite component
  • GPS is a system-of-systems. Satellites,
    operational control segment receivers must be
    effectively integrated
  • Minimum constellation size should be 30
    satellitesto better support ground forces in
    varied terrain
  • Ambitious requirements are driving the cost of
    GPS III
  • Cost weight must be controlled
  • Dual launch essential
  • Relax emphasis on anti-spoof. Increase attention
    to anti-jam
  • Time attention must be given to maintain GPS as
    worlds premier satellite navigation.
  • Governance needs adjustment improvementopen-min
    ded approach is necessary in considering options

4
Mask Angle Effects
(24-4)
(24-3)
(24-5)
(30-1)
(24-2)
(24-6)
(24-1)
X
X
15o
15o
5o
5o
Assumes 1 m User Range Error Differences caused
by Geometric Dilution of Precision effects (DOP x
URE Accuracy)
5
GPS III Launch Costs
EELV Costs EELV-L75M EELV-M90M
EELV-H150M (Buy 1) EELV-L150M
EELV-M180M EELV-H300M (Buy 3 in Source
Selection) Failure Rates 4 Single 5
Dual (Source GPS JPO Study, 20 Jul 05)
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