The first trial is expected to begin next month with a satellite developed at the Kagawa University. Basically how it works is that when in space, the satellite will release a 300m long wire that can generate a magnetic field in which some (if not most) of the debris will be attracted to it. The final product is expected to be a lot bigger at 30cm wide but 1km in length. The collected debris and the net will then be released and sent towards the Earth’s atmosphere it is expected to burn up upon entry.
Assuming that this mission is a success, JAXA plans on cleaning up even larger objects, such as non-functional satellites that are just sitting out there. Wondering when all of this will be happening? Well it seems that we are in for a wait as the first space net satellite (not counting the test unit) will be deployed in 2019.