After a range of top fighter aircraft and other weapon systems, the US has now offered another sophisticated system to India, the Airborne Stand-Off Radar (ASTOR), whose capability has been described as 'unmatched by a former US navy official, reported Hindustan Times on Sunday. According to Admiral Walter F Doran, a former US Navy 7th Fleet commander, Indian officials had already been briefed on this latest radar, for highly effective 24-hour surveillance and target acquisition capability, India Strategic magazine reported in its latest issue. The British Army and Royal Air Force (RAF) in Afghanistan are operating the system now with five ASTOR aircraft and eight ground stations. Admiral Doran is quoted in the magazine as saying Raytheon, a military technology giant, had also submitted a formal proposal to the Indian government, but he declined to give further details. First deployed in 2008, ASTOR can even detect minor variations in surface levels, like digging and filling of earth at the same place, and draw conclusions about activity. The system consists of an Active Electronically Scanned Array (AESA) radar on board the Bombardier Global Express 'Sentinel business jet. Admiral Doran said the capability on board the ASTOR was unmatched, pointing out that although Raytheon did not make platforms, its combat systems were being used in most of the US aircraft, ships, spacecraft and land vehicles including the Boeing F-18 Super Hornet, F-15 Eagle and P8 Multi-mission Maritime Aircraft (for the US and Indian Navies). The company has also built an AESA radar for F 16s, should a country buying it make the choice in its favour. The ASTOR flies high enough - 40,000 to 45,000 feet - to cover a large ground area, and to be beyond the range of most surface-to-air missiles (SAMs). It is also equipped with a self-protection suite to put out flares and chaff to confuse and deflect any threatening missiles. The US has already offered to India F-35 JSF, F-16 Super Viper, F-18 Super Hornet and P8I aircraft and weapon systems.