Surface movement radar

Surface Movement Radar (SMR) is used to detect aircraft and vehicles on the surface of an airport. It is used by air traffic controllers to supplement visual observations. It may also be used at night time and during low visibility to monitor the movement of aircraft and vehicles. Surface movement radar is the term accepted by ICAO, but it has historically been known by other names such a ground movement radar, airport surface detection equipment (ASDE) and airfield surface movement indicator.