By address

local component = require("component")
local radar = component.proxy("xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")

By searching through all the components

local component = require("component")
local radar = nil

for k,v in component.list() do
  local p = component.proxy(k)
  if not (p.isICBM == nil) and p.isICBM("component_radar_station") then
    radar = p
  end
end

• radar.getFrequency() : number
  Returns the frequency the radar operates on.

• radar.setFrequency(frequency : number)
  Sets the frequency the radar operates on.

• radar.getSafetyRange() : number
  Returns the SafetyRange the radar operates on.

• radar.setSafetyRange(range : number)
  Sets the safetyrange of the radar.

• radar.getAlarmRange() : number
  Returns the Alarm Range of the radar.

• radar.setAlarmRange(range : number)
  Sets the safetyrange of the radar.

• radar.getMissiles() : Table
  Returns a table with Missiles currently detected by the radar. The table has the following format
  { {uuid:string, x: number y: number, z : number}, {uuid:string, x: number y: number, z : number}, .... }
  Where x,y,z are the coordinates of the missile at the time of the function call and the UUID is a identifier for the missile.

• radar.getIncomingMissiles() : Table
  Alias for radar.getMissiles()

• Getting Started
• Example Programs
• Radar Documentation
• EMP Tower Documentation
• Missile Launcher Documentation
• Cruise Launcher Documentation