A Secondary Surveillance Radar (SSR) is a radar device installed in air traffic control facilities to allow the precise identification of aircraft. An SSR transmits an interrogation pulse; aircraft contain a transponder that listens for the pulse and sends a responding pulse. This is similar to conventional radar, but has the advantage that only aircraft will return pulses (i.e. birds, clouds, and terrain will not appear on the radar). Transponders also encode a 4-digit transponder code that can be used to identify an aircraft. More advanced transponders can also encode the aircraft's pressure altitude and callsign. This long range radar antenna (approximately 40m (130ft) in diameter) rotates on a track to observe activities near the horizon. ... Air Traffic Control Towers (ATCTs) at Schiphol Airport Air traffic control (ATC) services are provided by ground based controllers responsible for directing aircraft on the ground and in the air to ensure safe and efficient traffic flow is maintained. ... An aircraft is any machine capable of atmospheric flight. ... In telecommunication, the term transponder (sometimes abbreviated to XPDR or TPDR) has the following meanings: An automatic device that receives, amplifies, and retransmits a signal on a different frequency. ... Transponder codes are four digit numbers broadcast by the transponder in an aircraft to assist air traffic controllers in traffic separation. ... In aviation, pressure altitude is the indicated altitude when an altimeter is set to 1013 hPa (29. ... In broadcasting and radio communication, a callsign or call sign (also call letters) is a unique designation for a transmitting station. ...
The SSR antennas are used world wide for ground control and air traffic management governed by strict international standards.
Each ATC or Radar antenna is fully tested to demonstrate compliance with all applicable specifications at VertexRSIs FAA-approved test range in Kilgore, Texas.
The transfer of tooling and experience in ATC and Radar antenna products from the former plant in Sterling to the companys state-of-the-art facilities in Kilgore allows the Company to continue to provide the high quality products for which this line has long been known.
The primary surveillanceradar uses a continually rotating antenna mounted on a tower to transmit electromagnetic waves that reflect, or backscatter, from the surface of aircraft up to 60 miles from the radar.
The secondaryradar uses a second radar antenna attached to the top of the primary radar antenna to transmit and receive area aircraft data for barometric altitude, identification code, and emergency conditions.
The secondaryradar operates in the range of 1030 to 1090 MHz.
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