The Smos System

The SMOS System consists of a Low Earth Orbit (LEO) satellite, dedicated ground segment and launcher. A block diagram of the system architecture is shown in Fig. 6.

The satellite incorporates the EADS CASA Espacio Payload Module MIRAS and a platform based on the THALES ALENIA Space generic PROTEUS bus (Barre et al.). The ground segment of SMOS is sub-divided into two functional groupings, the Satellite Operations Ground Segment (SOGS) for spacecraft monitoring and control and the Data Processing Ground Segment (DPGS) for scientific data processing. The rocket selected to launch SMOS is the ROCKOT-Breeze KM operated by EUROCKOT from the Plesetsk Cosmodrome in Russia.

Ttc Model Ground Station Satellite

Fig. 6 SMOS System Block Diagram showing the space and ground segments and launcher (Barre et al. 2008). Satellite operations is via the Satellite Operations Ground Segment (SOGS). Scientific data processing is centred on the Data Processing Ground Segment (DPGS) consisting of the Pay-load Data Processing Centre (PDPC) and the SMOS Plan Generation Function (SPGF), assisted by Expert Support Laboratories (ESLs). Planning of payload operations is carried out at the Payload Operations and Programming Centre (PLPC)

Fig. 6 SMOS System Block Diagram showing the space and ground segments and launcher (Barre et al. 2008). Satellite operations is via the Satellite Operations Ground Segment (SOGS). Scientific data processing is centred on the Data Processing Ground Segment (DPGS) consisting of the Pay-load Data Processing Centre (PDPC) and the SMOS Plan Generation Function (SPGF), assisted by Expert Support Laboratories (ESLs). Planning of payload operations is carried out at the Payload Operations and Programming Centre (PLPC)

Satellite operations are managed by the SOGS located in Toulouse, France. The Telemetry, Tracking and Tele-Command Earth Terminal (TTCET) is an S-Band ground station providing bi-directional telemetry and telecommand links with the satellite using stations in Kiruna (Sweden) in combination with Kourou (French Guiana), Aussaguel (France) or Hartebesthoek (South Africa).

The DPGS, located at Villafranca near Madrid in Spain, is responsible for acquisition, processing, archiving and distribution of the scientific and associated auxiliary data generated in-orbit up to geophysical parameter level. The X-Band Acquisition Station (XBAS) acquires the X-Band down-linked data. The SMOS User Service centre provides interfaces and services between the SMOS System and external users.

The core of the SMOS system is complemented by external support teams and expert user-groups and centres such as the Expert Support Laboratories (ESL's).

A summary of the key SMOS mission parameters is given in Table 1.

Table 1 Key SMOS Mission Parameters

Global coverage:

Latitude 80S/N

Orbit:

Sun-synchronous

Altitude:

755 km

Spatial resolution:

50 km

Swath width:

Was this article helpful?

0 0

Post a comment