Spaceborne GPS Receivers

Broad Reach Delivers the TriG HW platform to NASA JPL

TriG: A Multi-GNSS Precise Orbit Determination (POD) and Radio Occultation (RO) Space Receiver.
In collaboration with NASA JPL, Broad Reach completed the TriG HW development and has delivered the EM HW platform to Jet Propulsion Laboratory.

Broad Reach is offering (Under license from CalTech) TriG-POD and TriG-RO products of this “Next Generation” GPS receiver with 16 month lead times for flight models and 6 month lead times for engineering models.

The TriG (Tri-GNSS) Receiver is a next generation multi-antenna GNSS receiver that is capable of both precision orbit determination for remote sensing missions and the application of GNSS signals for technically demanding radio occultation observations.

The TriG receiver has the capability to track both the legacy L1CA and L1 + L2 Semi-Codeless and the new L2C / L5 signals from GPS; as well as new GNSS signals from Galileo and GLONASS. The ability to track multiple GNSS signals allows for significant improvement in the quality and quantity of the radio occultation measurements, as well as providing the highest accuracy orbit determination which is very robust to outages.

TriG is the follow-on to NASA JPL’s highly successful BlackJack GPS receiver, epitomized by the IGOR/IGOR+ manufactured by Broad Reach (Under license from CalTech). To preserve a high degree of Blackjack heritage, the hardware architecture, software code base and digital signal processing (DSP) for the POD function remain largely the same. The occultation software is based on a combination of the operational BlackJack software used in the COSMIC mission and new software developed at JPL.

The hardware components of the TriG GNSS receiver consists of a Navigation Processor, Radio-Occultation (RO) Science Processor, RO Science DSP, RF Down-converter (RFDC), Reference Oscillator, and Power Supplies. The receiver is built by using an industry standard cPCI form factor, creating a modular, expandable, reconfigurable receiver platform that supports applications ranging from single antenna POD-only up to science missions using 16 antennas.

TriG Performance Features

  • Support for GPS CA, L1 and L2 Semi-Codeless, L2C, and L5
  • Support for GLONASS, Galileo, and COMPASS (in development)
  • Supports from 1 to 16 antennas
  • Supports Precision Orbit Determination (cm level positioning, mm/sec level velocity)
  • Supports Radio Occultation science for weather and climatology
  • Supports Reflections science applications (in development)

TriG seven 3U slot cPCI chassis

Navigation Processor Features

  • PPC603r Processing Platform using RogueOS
  • 128kbytes of System EEPROM (with TMR)
  • 1Gbyte of System NAND Flash (with TMR)
  • 256Mbytes of System SDRAM (with EDAC)
  • 384Mbytes of Sample SDRAM (no EDAC)
  • On-orbit Reconfigurable DSP FPGA
  • Spacecraft communication
    • 3 RS422 UARTs
    • 2 SpaceWire Ports
    • 4 RS422 pulse-per-second outputs, 1 LVDS pulse-per-second output
  • Ethernet interface for GSE communication during code development

RO-Science Processor Features

  • IBM750FX Processing Platform using Linux OS
  • 128kbytes of System EEPROM (with TMR)
  • 1Gbyte of System NAND Flash (with TMR)
  • 256Mbytes of System SDRAM (with EDAC)
  • 1Gbyte of Buffer SDRAM (no EDAC)
  • Spacecraft communication
    • 3 RS422 UARTs
    • 2 SpaceWire Ports
    • 4 RS422 pulse-per-second outputs, 1 LVDS pulse-per-second output
      • Generated by RO-Science DSP
  • PCI interface for backplane communication with RO-Science DSP board
  • Ethernet interface for GSE communication during code development
TriG Navigation Processor
TriG RO Processor Board

RO-Science DSP Features

  • 2 On-orbit Reconfigurable DSP FPGAs
  • 4 Gbytes of sample storage SDRAM
  • Sample interface from up to 16 antennas
  • 1 PPS generation for transmission by RO-Science Processor
  • PCI interface for backplane communication with RO-Science Processor board
TriG Digital Signal Processor Board
TriG Power Distribution Board
  • About Moog Broad Reach

    Founded in 1997, Moog Broad Reach produces spaceflight hardware and software solutions, integrating vehicle design, component design and engineering services for aerospace, scientific, commercial and military customers on four continents.
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