Canada's Conservative government has just blocked the sale of a division of the Canadian satellite firm MacDonald Dettwiler & Associates (MDA) to U.S. Alliant Techsystems. (Two Issues Combine to Scuttle an Aerospace Takeover,Ian Austen, New York Times, April 11).
The advanced satellite technology developed by MDA allows the Canadians to monitor their northern lands and waters, and shipping that may be entering those waters. The Canadian government is worried that the U.S. might gain control of the satellite system and use that control to compromise Canadian national security.
Mark, at the Canadian defense blog, The Torch, has done a nice series of posts on this. In Our new satellite surveillance capability... (January 12, 2008) he quotes from a Canadian National Defense backgrounder of January 10 to explain something about the satellite (Radarsat-2) and its associated information system (Polar Epsilon):