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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

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Status of GPS/AMS project

Agnieszka Jacholkowska

Groupe d’Astroparticules de Montpellier

 latest 2004 activities

 TOPSTAR 3000 2nd generation

A. Jacholkowska, AMS TIM

gps in orbit
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

gps project
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

topstar 3000d design
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

gps 1 st generation
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

gps 2 nd generation
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

gps 2 nd generation7
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

gps 2 nd generation8
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

gps 2 nd generation9
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

gps summary
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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