C-Nav GPS System

1. C-Nav GPS System GPS Services Group C&C Technologies, Inc., www.cctechnol.com/cnav

3. C-Nav GPS Receiver C-Nav Control Display Unit (CnC D.U.) Interconnect Cable C-Nav[RM] GPS System

4. C-Nav[RM] is? • A Worldwide ‘global’ GPS solution (RTG) • Provides deci-meter accuracy and stability • Simple ‘plug-n-play’ installation and use • Integrated ‘mast-head’ package minimizes equipment hardware requirements • Subscription Service activation and deactivation for long or short term usage • ‘Regional’ backup solutions (WCT & SBAS)

5. Global Corrected GPSvia StarFire Network • North & Central America (RTG, WCT, SBAS) • Western Europe / Mediterranean Sea (RTG, WCT, SBAS) • Far East Region (RTG, SBAS**) • Australia (RTG, WCT) • South America (RTG) • Eastern Europe / Mediterranean & Black Sea (RTG, SBAS) • African Continent (RTG) • Middle East, & Asian Continent (RTG) • Atlantic, Indian and Pacific Oceans (RTG) ** Waiting on MSAS

6. America’s RTG Performance

7. Europe-Africa RTG Performance

8. Asia-Australia RTG Performance

9. GcGPS Architecture • Global network of dual frequency GPS reference receivers which transmit their RAW observables to processing / distribution hubs (NPH) • Wide area communications used to broadcast corrections to users (StarFire) • Dual frequency GPS navigation receivers combined with wide area communication receiver • Measure / model key error sources (SV clock, orbit, local observed ionosphere, local troposphere)

10. Dual Frequency GcGPSPerformance and Limitations • Performance • Decimeter level accuracy over very large areas (regional, continental, global) • Initialization time: 15 minutes to one hour (final accuracy) • Very low position drift rate in steady state • Limitations • Requires communication link to receive WADGPS corrections (sat. comm., other) • Potentially lengthy initialization time

11. Recent Improvements • L1 phase navigation ‘smart’ position updates • Upstream (50Hz) measurement processing restructure • L1 phase nav. residual editing and cycle slip detection restructure • RTG backing RTK

12. Onshore GPS Stress Testing

13. A - Shading Areas - B

14. RTG w/o L1Pnav

15. RTG with L1Pnav

16. Overlay

17. Offshore Stress Testing

18. Vessel Setup

19. C-Nav Testing

20. C-Nav Testing

21. C-Nav Testing

22. C-Nav[2050] System

23. RTK and GcGPS Synergies Q:If both RTK and dual frequency Starfire Wide Area DGPS (GcGPS) navigation solutions are available in the same system hardware/firmware, can they be combined to provide better performance? A:Yes

24. Convential RTK Systems Typical Architecture • RTK base station: stationary, dual frequency GPS receiver generates local corrections • Terrestrial communications link used to transmit base station corrections to the RTK rover • RTK rover (navigator): dual frequency GPS receiver receives base station corrections and resolves carrier phase, integer ambiguities for satellites in view.

25. Convential RTK SystemsPerformance and Limitations • Performance • Centimeter level accuracy (1cm + 1ppm) • Effectively zero position drift rate • Initialization time: a few seconds to a few minutes • Limitations • Requires local base station and communication link to receive RTK correction data. • Operational area limited by range to base station • Range of communication link • Range limit for ambiguity resolution

26. Exploiting RTK and WADGPS Synergies • Initializing the WADGPS solution with RTK • Coasting’ through RTK outages using Carrier Phase RTG measurements • Re-initializing RTK using the WADGPS solution

27. The Problem

30. Questions? Refer to: http://www.cctechnol.com/cnav for additional material and information