[Spaceships] Calculating Missile Damage

[panton41]

I'm working on a space fighter game and I'm needing a rules clarification on missiles.

Despite reading the rules I'm a bit unclear on how missile damage is calculated. Are the attacker and defender's relative velocity added to the damage the missile does and if so what does that mean in a situation like a Fast Pass or between vehicles with vastly different accelerations?

Oh, and to make the question that much more complex does the same rule apply to both Basic and Tactical rules?