First thing to do is pay bribe for Coalition on Earth (3 mils)
So the solution is to cruise and wait with your finger on button c (countermeasures) with 100% concentration. When they appear make a suden evasive maneuver and start droping countermeasures to avoid geting hit by cruise distruption missile.
You can avoid 2/3 of encounters this way.
If they do "cruise distrupt you" dont run, turn around and kill them... all of them 
You do this in the folowing way, when you turn to face them they will be in formation and they are DANGEROUS, close in but maneuver to avoid the incoming barage, fly in like crazy and they will break the formation, then press R to aim the nearest nomad.
Pound him in a controled fasion and keep making maneuvers, the nomads will be out of formation, kinda deoriented, you will still get some sporadic fire... just keep flying like crazy, use cells, and nanobots, and when you destroy a nomad press button B to colect cells and batteries he droped 
Whenever you kill a nomad there will be one less nomad attacking you, so try to be very agresive at the begining and take out 2-3 of them, after that it is kinda easier.
And you can use Dark Reigin ion cannons as safe points (if the nomads are attacking you and you are close to one, head there and it will save your butt).
