Drone detecting radars are not that cost intensive. The threat has been flagged for quite a while now. But in India things moves only after serious incidents.
I read an article by AIM which is more mundane that Vivek Agnihotri’s tweets.
The drone built in China or Pakistan will obviously use their own softwares.
GPS jammer will effect our own equipments which we use in our installations.
Diffrent registered brands like DJI use their own softwares which enforce registration and pairing drone serial number.
They do have flight data saving provisions in the software but it is optional.
The registration can be made mandatory on some government ID and phone number including Live Photo capturing like many websites especially financial, trade etc., do.
I generally check on DJI maps Air Share app to make sure I am not flying in restricted or other probhited zones. They always encourage operators to pre inform the planned flight schedule. These all are again optional formalities but when flying in restricted zones they can prompt the operator to contact concerned authorities.
Example of one my correspondence with air share.
These optional formalities can be made compulsory for domestic users.
Also these software update their maps and have clearly GPS marked zones. Trying to fly in these zones the software can start giving warning or at times bring the craft down when it uses GPS signals.
There are certain flight profiles like flying below the trees of nearby buildings and these are called shielded operations. These are very discrete and safe operations. But any domestic operator can be traced with more advanced scrutiny of software, data, mobile signal triangulation, gps use in the area of concern like we do trace criminals.
With all above mambo jumbo excluding strategic and tactile response and deterrence. The problem can be cheaply solved by re designing cantonment perimeter by clearing vegetation and moving important buildings away from possible drone incursions.
Therefore only effective method is to see, detect and shoot.