PRISMA-Blog
 
 

DLR’s Advanced Rendezvous demonstration using GPS and Optical Navigation (ARGON)

18. July 2012, 17.14
The DLR’s Advanced Rendezvous demonstration using GPS and Optical Navigation (ARGON) has been successfully executed during the PRISMA mission in the time frame April 23-27, 2012. The ARGON experiment demonstrated a long-range rendezvous to a non-cooperative target by means of angles-only measurements. Starting from more than 30 km distance, the active Mango s/c approached the passive Tango s/c to reach a 3 km safe hold-point within five days of ground-based operations.
Benjamin Schlepp
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Benjamin Schlepp
 
 

Resuming Activities for PRISMA

17. April 2012, 13.35
A long time has passed since the last Blog entry. After return of the PRISMA formation to the Swedish Mission Control Center in Solna in August last year, several reports were generated and data evaluated, but we still had an unfinished business with PRISMA. One interesting experiment, which could not be performed during the GSOC operations phase, was still outstanding.
Ralf Faller
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Ralf Faller
 
 

PRISMA Mission Control returned to Sweden

16. August 2011, 10.45
After more than 5 months of successful flight operations by GSOC, the operational control was re-handed over again to the control center in Solna, Sweden. Since handover to GSOC in March this year, various experiments could be performed. My colleagues already reported corresponding details within the Blog. I’ll now try to describe the topic of a satellite mission handover.
Ralf Faller
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Ralf Faller
 
 

Proximity Experiments using the VBS Close Range Camera

09. May 2011, 17.46
Satellites flying in specific formation during proximity operations are relying on an accurately determined position. So far PRISMA has been relying on GPS for navigation. On 21st of April and from 2nd to 4th of May several proximity operations experiments below 30m relative distance have been performed with the VBS close range (CR) camera running as a passenger experiment in open loop.
Jörn Spurmann
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Jörn Spurmann
 
 

Ecological Advanced Propulsion Systems (ECAPS) starts its final experiment campaign

07. May 2011, 10.29
From the 14th of April the ECAPS High Performance Green Propulsion System (HPGP) experiment started its final campaign HPGP-4, the one planned for the extended mission period.
Ralf Faller
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Ralf Faller
 
 

VBS Far Range data taken during transfer in-between experiments

05. May 2011, 18.29
The different experiments executed at GSOC are performed at different relative distances between the two spacecrafts. According to this we had to transfer Mango from a position at 1500 m behind Tango closer down to 50 m. The ideal opportunity to take a sequence with the Far Range camera testing its use for later GSOC experiments.
Jörn Spurmann
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Jörn Spurmann
 
 

PRISMA Earth Imaging of Southern Germany

03. May 2011, 17.52
On 19th of April the DVS camera system on-board MANGO took some exceptional images of the Earth surface. One of those is a fine picture of the Alps separating Germany and Italy. Several remarkable spots can be recognized here.
Benjamin Schlepp
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Benjamin Schlepp
 
 

AFF Completion of experiments

29. April 2011, 11.37
SSC (Swedish Space Corporation) performed a remarkable autonomous close approached to bring MANGO and TANGO to a distance of less than 15 m. The maneuvers needed for that approach were computed by their autonomous formation flying (AFF) software on-board of MANGO. During an experiment of 8 days duration SSC performed numerous formation keeping and formation configuration maneuvers to verify the handling of different formation scenarios.
Benjamin Schlepp
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Benjamin Schlepp
 
 

Vision Based Autonomous Rendezvous from 30 km to 50 m

27. April 2011, 13.58
On 5th to 6th of April the Autonomous Rendezvous (ARV) experiment number two was executed at GSOC for SSC. During this experiment an autonomous approach from 30 km down to 50 m was performed closed-loop only using the Far Range Camera (FRC) of the Vision Based Sensor (VBS) System.
Jörn Spurmann
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Jörn Spurmann
 
 

AFC2 sets up a photo shoot for Tango

25. April 2011, 17.18
The second DLR's Autonomous Formation Control (AFC) gave GSOC its first chance to realize a Tango photo shoot. A bit of studying of the poses, kept the camera still and…click!
Gabriella Gaias
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Gabriella Gaias
 
 

PRISMA Experiment Operations at GSOC

21. April 2011, 14.10
The goal of PRISMA is to demonstrate sensors and flight software needed to perform formation flight and rendezvous missions. With respect to future on-orbit servicing missions, PRISMA is a milestone in developing and demonstrating the required technologies in orbit. The experiment operations started after commissioning and separation of the two spacecraft, Mango and Tango, in August 2010 . The basic experiment programme is planned to last ten months, with an additional two months for an extended campaign. The first half of this timeline was successfully executed by the Swedish Space Corporation, and after the transfer of operations on 14 March it is now GSOC's turn to conclude the nominal first year of operations. Let's have a closer look at the project structure, the experimenter's contributions and the experiment operations to be conducted at GSOC.
Jörn Spurmann
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Jörn Spurmann
 
 

PRISMA – Mango and Tango in mission operations mode

05. April 2011, 14.30
On 14 March 2011, the German Space Operations Center (GSOC) took over operations of PRISMA. Despite my 20 years of service, I must say that even though every mission launch is special, the transfer of operations for an ongoing mission has a very new ‘feel’ about it. PRISMA has been different in many ways. The aim of this mission is to demonstrate various formation flying and rendezvous scenarios at separations of as little as a few metres with satellites Tango and Mango.
Ralf Faller
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Ralf Faller