DVS for PRISMA flying formation

The H2VMU of the DVS for the PRISMA project
The Optical Unit of the DVS
The DVS payload on board the PRISMA Satellite during system test (courtesy of Swedish Space Corporation)
The PRISMA flying formation in the solar simulator (courtesy of Swedish Space Corporation)
An image of the Target satellite set by TSD Digital Video System (courtesy SSC)
An image of the Target on Oct., 19th, 2010 (courtesy SSC)
An image of the Target on Sept., 14th, 2010 (courtesy SSC)
An image of the Earth set by TSD Digital Video System (courtesy SSC)

PRISMA is a R&D program founded by the Swedish National Space Board (SNSB). Prime contractor is Swedish Space Corporation (SSC); the major partners are the German Aerospace Center (DLR), the French Space Agency (CNES) and the Technical University of Denmark (DTU). Many contributions come from ECAPS, Nanospace, Techno System Developments (TSD) and the Institute of Space Physics of Kiruna.

The mission is primary a RVD and Formation Flying technology test bed. It consists of 2 spacecrafts – named Mango (Main spacecraft) and Tango (Target Spacecraft) – orbiting in LEO sun-synchronous orbit at around 600-1000 km. The Main Spacecraft employs three propulsion systems and a 3-axis control system based on reaction wheels and star cameras; a Vision Based Sensor developed by DTU is used to track the Target position. A video system designed by TSD is also foreseen on-board. The  overall weight of the Main satellite is about 150 kg.  The Target is equipped with a 3-axis attitude control system based only on magnetic control, a GPS receiver, the Formation Flying RF sensor developed by CNES.

The Prisma satellites have been succesfully launched on a Dnepr rocket from Yasny, Russia, on June 15th 2010. The DVS on board the Main satellite transmitted first images on August 2010.

PRISMA DVS Main Specifications
Video input up to 20 Megapixel/s
Pixel size  8 to 12 bit per pixels
Image size  up to 4 Megapixels
Frame rate  up to 20 fps at 1024 x 1024 (up to 5 fps at 2048 x 2048)
Output  SpaceWire running up to 40 Mbps

 7.5 Mpixel/s in loss-less mode

20 Mpixel/s in lossy mode

Compr. factor
 from 1 to 60
Storage  volatile on-board data storage up to 8 Gbit
Voltage  18 to 40 Vdc
Power consumption

 < 13 [W] in acquiring or acquiring and downloading mode

< 7 [W] in idle or downloading mode

Mech. dimensions  140 x 130 x 160 [mm]
 Mass  2.4 [kg]

























Updated  April 2011