Gao report on gps
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GAO Report on GPS. “Significant Challenges in Sustaining and Upgrading Widely Used Capabilities”. Presented on 30 April 2009 to Subcommittee on National Security and Foreign Affairs, Committee on Oversight and Government Reform, House of Representatives Released to the public on 8 May 2009

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GAO Report on GPS

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Gao report on gps

GAO Report on GPS

“Significant Challenges in Sustaining and Upgrading Widely Used Capabilities”

Presented on 30 April 2009 toSubcommittee on National Security and Foreign Affairs, Committee on Oversight and Government Reform, House of Representatives

Released to the public on 8 May 2009

http://www.gao.gov/new.items/d09325.pdf


Context

Context

  • 11 of 46 papers at US Hydro 2009 depend upon the assumption that GPS is a reliable infrastructure, that can only get better.

  • This assumption may be too optimistic


Subsystem status sept 2008

Subsystem Status (Sept 2008)

33 in orbit

21 okay

4 unhealthy

7 last clock

Riedesel, CGSIC48 [05] Sept 08


Gao report on gps

PDOP map for 17 May 2009


18 satellite outage map

18-satellite outage map


Gps signal evolution

GPS signal evolution

Previouslaunches

Launchesfrom Dec 2005


Gps ground station upgrades

GPS Ground Station Upgrades

Military use of modernized signal

Army, Navy, Marine Corps fully equipped with modernized GPS equipment by 2025,

12 years after IOC - 18th modernized launch (2013)

10 years after FOC - 24th modernized launch (2015)


Iif procurement problems

IIF Procurement problems

  • Significant technical problems (not yet solved)

  • New acquisition policy relaxed oversight and quality inspections, introducing problems

  • Contractor changed locations, teams, and ownership several times (7 project managers so far)

  • Requirements creep

  • 3 years behind, 120% over budget


Block iii acquisition

Block III acquisition

  • Divide into 3 evolutionary phases

    • IIIA - stronger military signal, L1C

    • IIIB - crosslinks

    • IIIC - improved military antijam

  • Two civil payloads for IIIB, IIIC

    • Distress Alerting Satellite System (DASS)

    • Satellite Laser Ranging retromirrors

  • GAO report judges planned delivery schedule too optimistic, and predicts 2 year delay


International alternatives

International alternatives


Gao report on gps

http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:20:11394786619100357095::NO:::


Bottom line

Bottom line

“For civil and commercial users, one possible impact of a smaller GPS constellation could be an increased use of other positioning, navigation and timing (PNT) services, including those expected to be offered through Europe’s Galileo system . . .”

Department of State asks for higher priority for US expert participation in international PNT activities, to ensure compatibility with GPS is maintained.


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