This might sound weird, but IMO it has a point;
why not create an extremely large cannon (like 1000,000 mm for instance) to target the Sathani? All the GTVA will have to do is to estimate where the Saths are, point the cannon, and fire. The shell will probaly not stop moving due to Newton's Laws of Motion (however, there might be an object blockading the path, hopefully not). Saths don't have shields, right?
OR else,
counter a Sath with like twenty-five corvettes. They just have to do a flanking manuever. If the Sath tries to move around to counter them, just keep them moving; it's like a seal trying to evade a shark.