The preliminary security arrangements began in July and senior police and intelligence officials have been regularly updating them to weed out any shortcomings and glitches.
Nearly 6,000 security personnel and hundreds of CCTV cameras will monitor from three control-rooms the venue at Red Fort, from where Prime Minister Narendra Modi will address the nation in presence of dignitaries, including foreign representatives and thousands of visitors, police officials said.
Special measures will be taken to meet on-the-spot situations such as the prime minister choosing to meet people at the venue as he previously did twice, they said.
More than 5,000 Delhi Police personnel and 1,000 paramilitary personnel will be deployed at the venue apart from elite NSG commandos intelligence officials.
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Special teams of police will be stationed to neutralise the possibility of any airborne-activity such as drones.
In a massive screening exercise, police has collected details of over 9,000 people residing in the vicinity of the Red Fort to ensure that most people near the venue are marked out and strangers could be checked in case of any exigency.
Panoramic photography will be used to ensure a close watch on the 605 balconies and 104 windows that open towards the Red Fort, said the officials.
Security agencies have also marked out over 3,000 trees around the Fort so that no man or material was lodged there, they said.