GPS Modernization

14 March 2005

CGSIC IISC Europe

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Civil SatNav Applications Enabling technology

Unlimited growth potential $68 billion industry worldwide by year 2010

Wide use in transportation safety Aviation, maritime, railroad, highway, etc. Potential to reduce land-based navigation systems Centerpiece of future transportation infrastructure

Ever increasing range of civil uses Telecommunications, surveying, law enforcement,

emergency response, agriculture, mining, etc. Used in conjunction with remote sensing Supporting civil applications never envisioned

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Block IIA/IIR Block IIIBlock IIR-M, IIF

III: IIF capabilities &• Improved civil signal (L1C)• Increased accuracy (4.8-1.2m)• Evaluating integrity improvements • Navigation surety

Increased A/J power (+20 dB)

IIA / IIR: Basic GPS• C/A civil signal (L1C/A)• Std Service, 16-24m SEP• Precise Service, 16m SEP

• L1 & L2 P(Y) nav

IIR-M: IIA/IIR capabilities &• 2nd civil signal (L2C)• New military code• Flex A/J power (+7dB)

IIF: IIR-M capability plus• 3rd civil signal (L5)

GPS modernization balances military and civil needs

GPS Modernization Plan

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Civil Benefits of GPS ModernizationNew signals provide

Reduced vulnerability to interference Calculation of ionospheric corrections at user site

Improvements in service performance in accuracy, availability, integrity, and reliability Provide centimeter-level accuracy for scientific and survey

applications

New spectrally separated signals Preserve civil use outside areas of military ops

New commercial opportunities

Opportunity to converge services with other global satellite navigation systems

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Benefits of L2C Improves service for ~ 50,000 current scientific/ commercial

dual-frequency users Extends service for safety-of-life, single-frequency E-911

applications Provides 24 dB better protection than C/A against code

cross correlation and continuous wave (CW) interference Signal defined in ICD-GPS-200C

L2C codeBegins with IIR-M satsFirst launch: May 200524 Satellites: 2012

Second Civil Signal (L2C)

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Third Civil Signal (L5)

Benefits of L5– Improves signal structure for enhanced performance

• Higher power (-154.9 dBW)• Wider bandwidth (24 MHz)

– Aeronautical Radionavigation Services band• Co-primary allocation at WRC-2000

(1164-1215MHz)– Signal defined in IS-GPS-705

L5 code Begins with IIF satsFirst launch: 200724 Satellites: 2014

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L1C Signal

Benefits of L1C Adds a modernized L1 civil signal

In addition to C/A code to ensure backward compatibility

Higher precision Added interference protection

Enables civil interoperability with Galileo Converges with Galileo L1 Open Service

L1C Begins with GPS III satsFirst launch: 201224 Satellites: 2017

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• Contracts awarded in January 2004

– To Lockheed and Boeing for 12-month requirements definition effort

– Leading to Systems Requirements Review

• Selection of final contractor anticipated in 2005

• First launch projected for 2012

GPS III Status

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GPS III Civil Benefits

• Significant increase in system accuracy

• Improve robustness to interference

• Improve level of unaugmented integrity

• Improve availability of accuracy with integrity

• Backward compatibility with existing receivers

• Operational capability for L2C and L5– In combination with GPS IIR-M and IIF satellites

• Flexibility to respond to evolving requirements with limited programmatic impacts

• Opportunity to converge with Galileo Open Service

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Legacy Improvement

• Legacy Accuracy Improvement Initiative by Air Force and National Geospatial-Intelligence Agency in 2005– Additional info decreases “Age of Data”, thus increasing

accuracy in GPS satellite orbital position and clock data

• Integrity Failure Modes and Effects Analysis – Knowledge of GPS failure modes required to design improved

integrity monitoring systems

• Continuing improvements to WAAS and NDGPS

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Current GPS Monitoring Stations

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GPS Monitoring StationsAccuracy Improvement Initiative (AII)

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JPO GPS Modernization http://gps.losangeles.af.mil/engineering/icwg/

Navigation Information Service

http://www.navcen.uscg.gov

http://www.navcenter.org/ (mirror site)

E-mail: nisws@navcen.uscg.milPhone: +1 703 313 5900

Fax: +1 703 313 5920

Modernization Information