The naval anti-drone system which can detect micro-drones uses the help of radar, electro-optical/infrared (EO/IR) sensors and radio frequency (RF) detectors to detect and jam the micro drones.
source https://www.jagranjosh.com/current-affairs/indian-navy-signs-contract-with-bel-to-procure-naval-anti-drone-system-1630585823-1