The centres of interest of my photos here are neither the clouds nor the hills, but the radar stations at the top of Beacon Hill (筆架山). Someone may ask, “Why don’t we build the stations on the Lion Rock (獅子山). The reason is simple enough. The Lion Rock is too steep and difficult to access.I used to see the large white ball-like multi-faced Secondary Surveillance Radar (SSR) when I was still living in Kowloon Tong. In the past, it served to detect the movement of planes that flied over Hong Kong for our old Kai Tak Airport. Today it is still there working. This type of radar provides, after processing, the range, bearing, altitude and identity (callsign) of an aircraft. The coverage can reach 250NM. A SSR can provide more useful information than PSR (Primary Surveillance Radar) but is subject to the proper functioning of the aircraft's transponder. To provide the best accuracy of aircraft targets, the SSR is usually paired with a PSR for air traffic control purpose.
The taller and smaller radar beside it should be a modern one which works on Radar Data Processing and display System (RDPDS), Flight Data Processing System (FDPS) and Simulator System (SIM) - (The heart of the air traffic control system) for our Hong Kong International Airport at Chek Lap Kok.
The RDPDS processes the radar data from various primary and secondary radars to present the aircraft position and its related information, e.g. aircraft callsign, altitude, ground speed, aircraft category, etc. on the radar display. This information is used by air traffic controllers to control the approach/departure, terminal and en-route traffic.
The FDPS processes the flight plan data from aeronautical messages and prints out flight progress strips automatically for use by air traffic controllers to assist in updating/monitoring of the aircraft flight profile, such as flight route, estimated time of departure/arrival, flight level, expected times at reporting points, cruising speed, etc.
The SIM is a replica of the operational system and is used for the training of air traffic controllers and evaluation of air traffic control procedures.
From my observation, the planes coming from north-east (Japan, United States, Canada, ...) usually fly by way over Sai Kung, Shatin, then Tsuen Wan, turn south-westward and land on the airport or they fly by way south of Hong Kong Island and turn north-eastward for landing. Planes coming from the Philippines, countries of Southeast Asia and Australia simply land in north-east direction from the sea.






















