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A Mode A transponder code response can be augmented by a pressure altitude response, which is then referred to as Mode C operation. [2] Pressure altitude is obtained from an altitude encoder, either a separate self-contained unit mounted in the aircraft or an integral part of the transponder.
Several new modes were also introduced during this process. Civilian modes B and D were defined, but never used. Mode C responded with a 12-bit number encoded using Gillham code, which represented the altitude as (that number) x 100 feet - 1200. Radar systems can easily locate an aircraft in two dimensions, but measuring altitude is a more ...
There have been a number of modes used historically, but four are in common use today: mode 1, mode 2, mode 3/A, and mode C. Mode 1 is used to sort military targets during phases of a mission. Mode 2 is used to identify military aircraft missions. Mode 3/A is used to identify each aircraft in the radar's coverage area.
Each TCAS-equipped aircraft interrogates all other aircraft in a determined range about their position (via the 1030 MHz radio frequency), and all other aircraft reply to other interrogations (via 1090 MHz). This interrogation-and-response cycle may occur several times per second. [6] [2]
Specialty military air operations are located at this facility, as the installation has two usable landing fields, and plans for a third. The FAA Charlotte Sectional Aeronautical Chart identifies this area as Special Use Airspace R-5301, which is continuously restricted from general aviation traffic from the surface to an altitude of 14,000 feet above Mean Sea Level.
Secondary surveillance radar antenna (flat rectangle, top) mounted on an ASR-9 primary airport surveillance radar antenna (curved rectangle, bottom).. The need to be able to identify aircraft more easily and reliably led to another wartime radar development, the Identification Friend or Foe (IFF) system, which had been created as a means of positively identifying friendly aircraft from unknowns.
Interrogating aircraft transmit in the 1024-1150 MHz band, split into 1 MHz channels numbered 1-126; the responding station (ground, ship, or another aircraft) is 63 MHz (63 channels) above or below the originating frequency, depending on the channel and mode of operation selected.
For the 12-month period ending June 6, 2008, the airport had 34,100 aircraft operations, an average of 93 per day: 97% general aviation and 3% military. At that time there were 71 aircraft based at this airport: 87% single- engine , 10% multi-engine and 3% helicopter .