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| What means Secondary Radar? |
| In contrast with the traditional radar process, which depends on the processing of the radar transmitter signal after its partial reflection (echo) from an aircraft target, in the secondary radar process a response signal, generally coded, is triggered in a responder unit by the signal from an interrogator station. The responder operates at a different frequency from the interrogator. |
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| What means Secondary Surveillance Radar (SSR)? |
| A method standardized by ICAO whereby information (identification,altitude) can be transmitted from an aircraft to the ground, by aircraft equipped with the appropriate aircraft unit (Transponder). |
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| What stands IFF for? |
| Identification Friend or Foe. A method of aircraft identification by secondary radar. |
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| What is the meaning of Basic Mark X - IFF System? |
A military identification system with three modes of interrogation, the predecessor of the currently used Mark X-SIF System.
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| What is the meaning of IFF Mark XII System? |
| Improved version of Mark X System utilizing cryptographic equipment. |
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| In which Mode operate AEROMARITIMEs IFF Systems? |
AEROMARITIMEs IFF Systems cover the following IFF modes:
Mode 1: This military mode provides 32 discrete code combinations and is used and assigned to flight missions.
Mode 2: This military mode provides 4096 discrete code combinations and is normally assigned as a temporary identity to specific aircraft.
Mode 3/A: This mode provides 4096 discrete code combinations and is normally used for track identification to safely guide and control military and civil aircraft sharing the same airspace.
Mode C: This mode provides altitude information from 1000 feet below, up to 126,700 ft above mean sealevel in 100-ft increments (input is derived from aircraft altimeter equipment).
Mode 4: This mode provides encrypted identification. Additional crypto devices have to be connected to the interrogator and transponder. |
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| What means the Identification System Mode S? |
The highly increased traffic density in the airspace requires a more powerful identification system than the existing one to guarantee the security in the airspace furthermore. This new system is able to cope with great volume of traffic, and is named Mode S (Select) system.
For it a new identification Mode was defined, which provides every transponder in an airplane with an address, a kind of "electronic number plate". Doing this, Air Traffic Control Centers are able to interrogate one single airplane targeted or selected. The name Mode S (select) is descended from this fact.
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| What is a complete shipboard IFF System on a vessel? |
| An IFF System comprising an interrogator subsystem for identifying targets, as well as a transponder subsystem, thus that other interrogators can identify the vessel. |
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| Which military vessels are fitted with a complete IFF system? |
| All military surface vessels which have a compatible radar. |
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| Are there any military vessels which are not fitted with a complete IFF system? |
| Mostly, submarines are fitted with a transponder subsystem only. |
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