Spaceflight Formation Flying Test Bed Takes Off 64
coondoggie writes "Getting complicated systems onboard a single spacecraft to operate as one integrated unit can be hard enough, but some space agencies are trying to address the challenges of getting multiple spacecraft to fly in formation and operate together as one unit. Such challenges are exactly what a new European Space Agency lab in the Netherlands is set to address. The test bed addresses crucial operational factors for formation flying, including mission and vehicle management, guidance navigation, dealing with faults and communicating between satellites."
DARPA has been investigating this concept a while (Score:4, Informative)
Re:formations (Score:5, Informative)
[Formations] arguably are not relevant in space...or at least i fail to see the relevance from any standpoint other than purely tactical. The only thing spacecraft require is an understanding of eachothers location, and an understanding of the location of objects around them. a significantly well developed computer program would certainly be capable of tracking this information
Disregarding the fairly major difficulty of accurately determining the location of objects around them (not to mention the nontrivial bit of understanding its own location), they also need to have an understanding of the velocity and acceleration as well. In space, moving in one direction doesn't mean what you think it means. If one accelerates in the direction of motion, it will take longer to orbit the Earth. If two satellites at the same altitude are traveling parallel to each other in the same direction, they will collide in 1/4th of an orbit. There's a reason that there was a spacecraft recently whose sole purpose was to demonstrate autonomous rendezvous.
If that still sounds simple, now add a dozen satellites, and realize you can't just make them fly in the same formation all the time. The fuel requirements for stationkeeping of the outermost satellites would be astronomical. You have to minimize course corrections if you want a reasonable mission lifetime. Or carry a great deal of fuel, which can easily defeat the purpose of using smaller spacecraft in the first place. On top of that, when you need to apply collision avoidance maneuvers, you have to make sure you don't put yourself onto a collision course with the other 10 satellites.
As for the purpose of formation flying (note we're talking about the cluster kind - the trailing formations are fairly straightforward):
Wikipedia [wikipedia.org]