He says that the missile which tested Wednesday, is part of Iran's defensive forces, and that the test is intended to reinforce the deterrent military.
VOA: standard.2009.12.18
By tracing the trajectory of the Palestinian missile within the first few seconds of its flight, the system could calculate whether or not it was heading for a populated area and therefore whether the firing of a defensive interceptor missile was necessary.
The Phalanx is also being sold to Australia as part of the deal, extending the anti-missile defensive capabilities of one of America's most important Pacific allies.