Since 2014, As a part of modernisation, BSF also started installing infra-red, thermal imagers, aerostats for aerial surveillance, ground sensors, radars, sonar systems to secure riverine borders, fibre-optic sensor and laser beam intrusion detection systems on specific sections of border with Pakistan as well as Bangladesh. These Hi-tech systems are installed in areas where barbed wire fencing could not be installed due to treacherous terrain or marshy riverine topography. The largest section of this system is located at Dhubri, Assam, where Brahmaputra river enters Bangladesh.
