Septentrio N'V'

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• Septentrio N.V.
• CGSIC L2C Panel Discussion
• Arlington, March 10, 2004

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PolaRx Flexible platform

• Dual-freq receivers using codeless tracking
• DGPS/RTK base station / rover
• Single board attitude/heading and multi-antenna
  capability
• Integration and communication
• (LINUX, Ethernet, on board logging)
• Advanced geodetic features s.a. 1PPS-in
• GLONASS-ready

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L2C Prototype

• Flexible extension platform for L2C signals
• Combines existing building blocks (chips) from
  PolaRx2 with FPGA
• Allows
• Fast implementation of tracking and decoding of
  L2C signals
• Integration with existing GPS/SBAS receiver
• Used for L2C
• Implementation
• Tested with
• Spirent simulator

GReFe (L2 Front End)
GReCo
FPGA
GReFe (L2 Front End)
uP Board
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Why do this?

• Benefit-driven, not mandate-driven
• L2C allows replacing P-code in the long run
• P code always educated guess PRN sequence not
  known, but reasonable approx possible
• Consequently
• Low C/N0 35dBHz compared CA
• Loss of signal much more likely gt lower
  availability of dual-freq PVT
• Also
• longer acquisition time (lower availability) and
  
• bias after acquisition up to few meters
  (dualfreq error)
• L2C modulation known hence better quality

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Please visit our website www.septentrio.comor
contact us at info_at_septentrio.com

• Thank you !