Instrument Data Management for High Resolution Earth Observation Missions

Paper number

IAC-07-B1.4.08

Author

Mr. Boris Penné, OHB-System AG, Germany

Coauthor

Mr. Carsten Tobehn, OHB-System AG, Germany

Coauthor

Dr. Rainer Rathje, Germany

Coauthor

Dr. Harald Michalik, Germany

Year

2007

Abstract

Current Earth observation missions with increasing spatial and spectral resolutions (0,5m to 5m and/or using 8 to 200 channels) set increasing requirements for on-board instrument data management in terms of high data rates and large data volumes. The downlink capacity on the other hand is a limiting factor which can only be overcome by recent new technologies within the transmitter technology on one side and the data pre-processing and/or compression on-board on the other side. 
This paper presents an advanced and innovative architecture for spaceborne high speed payload data management subsystems designed in a modular approach in order to cope with different requirements in terms of data volumes/rates and redundancy approaches. The Payload Data Handling System (PDHS) comprises the following main constituents: Data Processing, Compression, Storage, Channel Coding and Encryption, and Transmission. 
The entire data management chain beginning from the output of the imaging sensor to the downlink will be presented. The chain introduces the advantages of the IEEE 1355 Spacewire standard to provide scaleable redundancy and performance. The modules of the chain like on-board data processing (LEON processor) feature data compression, data evaluation and truncation of data to the area of interest as well as data storage, data formatting (CCSDS), data encryption and downlink. The system comprises also the complete ground test equipment for verification of the PDHS as stand-alone units, at subsystem level and for complete system tests during satellite AIV.
The presented concepts are based on our experience and heritage of PDHS for optical payloads for MSRS and KOMPSAT II and for the Synthetic Aperture Radar system SAR-Lupe.
The performance of the chain reaches more than 10Gbit/s input rate and an output rate of 740Mbit/s using dual polaristation techniques at X-Band at considerable low resources for power and of about 40kg in a redundant configuration.

Abstract document

IAC-07-B1.4.08.pdf

Manuscript document

IAC-07-B1.4.08.pdf (🔒 authorized access only).

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