12. The National Airport Authority, a government of India undertaking, for planning, development and management of Air Traffic Control and Communication, Navigation and Surveillance Services over Indian air space, has to look beyond technical innovation to meet these challenges.
42. It operates in the VHF band of 112-118 MHz, used as a medium to short range Radio Navigational aid. It works on the principle of phase comparison of two 30 Hz signals
44. VOR enables the Air Traffic Controllers in the Area Control Radar (ARSR) and ASR for identifying the aircraft in their scopes easily. They can monitor whether aircraft are following the radials correctly or not.
47. The facility even though possible to locate independently, normally it is collocated with either VOR or ILS.
48. The DME can be used with terminal VOR and holding VOR also.
53. Permit the use of multiple routes on common system of airways to resolve traffic.
54. Permit distance separation instead of time separation between aircraft occupying the same altitude facilitating reduced separation thereby increasing the aircraft handling capacity.
56. The use of the system materially reduces interruptions of service at airports resulting from bad weather by allowing operations to continue at lower weather minimums.
58. This guidance must be of very high integrity to ensure that each landing has a very high probability of success.