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Status of GPS/AMS project Agnieszka Jacholkowska Groupe d’Astroparticules de Montpellier






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Status of GPS/AMS project Agnieszka Jacholkowska Groupe d’Astroparticules de Montpellier.  latest 2004 activities  TOPSTAR 3000 2 nd generation. GPS in orbit. GEO. GPS (20 000km). LEO. Earth. Provides Position / Velocity / Time on bord with no intervention from ground
Status of GPS/AMS project Agnieszka Jacholkowska Groupe d’Astroparticules de Montpellier

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Slide 1

Status of GPS/AMS project

Agnieszka Jacholkowska

Groupe d’Astroparticules de Montpellier

 latest 2004 activities

 TOPSTAR 3000 2nd generation

A. Jacholkowska, AMS TIM

Slide 2

GPS in orbit

GEO

GPS

(20 000km)

LEO

Earth

  • Provides Position / Velocity / Time

    on bord with no intervention

    from ground

  • Provides UTC time

  • Precision 10m / 1cms-1 / 1s

AMS02

A. Jacholkowska, AMS TIM

Slide 3

GPS project

 latest 2004 activities:

- June 04 (Toulouse) :

visit to Alcatel-Space,

discussion on production of TOPSTAR 3000 1st generation

proposal of a 2nd generation TOPSTAR 3000

to be launched end 2005 on ESA PROBA2 satellite

- December 04 (Toulouse) :

training at CNES Centre

work on measurements on ground

by Claude Zurbach – GAM software engineer

who will take care of AMS-Alcatel relation

and will contribute to the GPS implementation in AMS

A. Jacholkowska, AMS TIM

Slide 4

TOPSTAR 3000D – design

TOPSTAR 3000 design based on a GPS Core and optional modules

GPS Core integrates HW and SW for GPS processing and navigation :

  • RF/IF board

  • Processing Unit board

  • Processing software

    Optional modules enable adaptation to mission requirements :

  • DC/DC converter (21-50V unregulated bus)

  • High-class clock (OCXO with 10-9 s/s stability)

  • MIL-STD-1553B interface

GPS Core

276 x 42 x 170 mm3

1.5 kg

2-8 W

4 antennas can be connected

A. Jacholkowska, AMS TIM

Slide 5

GPS – 1st generation

RF IF

32-bit

processor

memory

Baseband

chip

GPS L1

I/O interface

RS422

10 MHz

1553B interface

1553B

OCXO

DC/DC converter

Primary power bus

(22V - 52V)

A. Jacholkowska, AMS TIM

Slide 6

GPS – 2nd generation

  • Improvements of TOPSTAR 3000

    • Mass reduction and volume (2 RF gates, mixed architecture,

      technological integration)

    • Consumption reduction (stand-by mode with consumption  0.)

  • Maintenance of multi-application compatibility

    • Compatibility PF LEO et CU

    • Compatibility with GEO

    • Compatibility with determination of attitude

  • Major evolutions

    • Compatibility in bi-frequency L1-C/A & L2CS

    • Compatibility in reception of signals in GEO navigation

  • A. Jacholkowska, AMS TIM

    Slide 7

    GPS – 2nd generation

    • Section RF/IF

      • 2 gates RF/IF, configurable L1/L1 or L1/L2 or L1/Lp

      • techno integration (MCM integrating preamps and filters SAW-RF)

  • Numerical treatment of the signal

    • modification of ASIC treatment for compatibility with L2CS.

    • modification of the software treatment of attitude.

  • Processor et interface

    • development of a new processor card based on ERC32 monochip,

      and associated software.

    • development of new ASIC for I/O, integrating 1553B interface.

  • Power supply

    • development of a new module, based on MCM technology (Alcate)l

  • A. Jacholkowska, AMS TIM

    Slide 8

    GPS – 2nd generation

    RF IF

    OCXO

    or TCXO

    32-bit

    processor

    memory

    Baseband chip

    (C/A CM CL)

    RF1

    RF2

    I/O interface

    RS422

    1553

    RF1 = L1

    RF2 = L1, L2, Lp

    DC/DC

    converter

    Power bus

    A. Jacholkowska, AMS TIM

    Slide 9

    GPS – 2nd generation

    • Budget

      • GPS Core Configuration : 1.0 kg - 6 W (L1/L2, TCXO, RS422)

      • Complete Configuration : 1.5 kg - 11W (L1/L2, OCXO, 1553B, DC/DC)

    A. Jacholkowska, AMS TIM

    Slide 10

    GPS – summary

    - Alcatel-Space proposes a 2nd generation TOPSTAR 3000 GPS

    which will equip most of the future ESA/CNES -satellites

    and LISA project

    (price not yet known, but 1st generation price not guaranteed)

    - 1st generation TOPSTAR 3000 :

     is in the Thermal CDR simulations

     documentation for the implementation in AMS DAQ

    has been provided to the collaboration

    A. Jacholkowska, AMS TIM


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