It's so easy isn't it, just so easy for a Navy to impose sea denial. Well except it's not. Here's why:
Firstly, The range of any ground/ship based radar in detecting surface targets is severely limited by the curvature of the Earth. The maximum range at which a radar can detect a ship or any other vessel/structure on the surface is given by :
where D is in Km and both h are in Meters.
The mast of INS Shivalik is around 15 meters above the water-line.
Assuming ground radar at 100m elevation(unlikely), the maximum radar detection range comes out to be 38.3 Km, irrespective of their maximum quoted range.
In other words, your ground radar networks are useless in detecting an IN fleet out at 300 km.
Unless PN or PAF commits an Erieye or equivalent, there is almost no chance for the PN to detect, let alone track, an IN warship.
Secondly, the IN in a wargame commited IN assets to try and detect the INS Satpura, and found none of its assets capable of detecting it beyond 100 km. And I'll bet my money on the IN having far superior maritime surveillance capabilities than the PN anyday.
The third problem is wrt the usage of the PN sub fleet. The SSKs (Agosta 90B) are definitely a serious threat. But they'd need atleast a rudimentary idea of the location of the IN ships to move to intercept. The PN subs cannot attempt to chase down the IN ships, they'll have to rely on ambushes.
The SSK speeds using AIP ranges anywhere from 3-8 Knots, compared with 25+ knots of IN fleet, making it impossible to chase down IN ships.
So how do you propose to keep IN 300 km out????
@
Windjammer, since you claim to take into account all possibilities, please do advise on how you intend to bypass these problems...