Squitter: Difference between revisions
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'''Squitter''' is a term relating to random pulses, pulse-pairs and other non-solicited messages used in various Aviation radio systems. Squitter pulses were originally, and are still, used in the [[Distance measuring equipment|DME]]/[[TACAN]] air navigation systems. Primarily, Squitter is used to maintain a regular signal from the ground beacon in order for the aircraft to 'lock-on' to. In the TACAN system, signal strength variation due to rotation of the transmitting beam, determines the course bearing function. (This function would be lost without a constant ~2700-4800 pulse-pairs per second in case of a lack of interrogating aircraft. |
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Squitter pulses in DME and TACAN systems, because of their randomness, appear the same as unsolicited/unsynchronised replies to other interrogating aircraft, as they are identical in shape and duration. |
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'''Squitter''' messages are unsolicited downlink transmissions from a [[Secondary Surveillance Radar]] Mode S system. |
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[[Secondary |
In the Mode S [[Secondary Surveillance Radar]] system, Squitter is a term used to describe messages that are unsolicited downlink transmissions from an ADSB (Mode S transponder) system. |
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Mode S [[transponder (aviation)|transponders]] transmit acquisition squitter (unsolicited downlink transmissions) to permit passive acquisition by interrogators with broad antenna beams, where active acquisition may be hindered by all-call synchronous garble. Examples of such interrogators are an [[TCAS|airborne collision avoidance system]] and an airport surface system. |
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Revision as of 00:15, 23 January 2014
Squitter is a term relating to random pulses, pulse-pairs and other non-solicited messages used in various Aviation radio systems. Squitter pulses were originally, and are still, used in the DME/TACAN air navigation systems. Primarily, Squitter is used to maintain a regular signal from the ground beacon in order for the aircraft to 'lock-on' to. In the TACAN system, signal strength variation due to rotation of the transmitting beam, determines the course bearing function. (This function would be lost without a constant ~2700-4800 pulse-pairs per second in case of a lack of interrogating aircraft.
Squitter pulses in DME and TACAN systems, because of their randomness, appear the same as unsolicited/unsynchronised replies to other interrogating aircraft, as they are identical in shape and duration.
In the Mode S Secondary Surveillance Radar system, Squitter is a term used to describe messages that are unsolicited downlink transmissions from an ADSB (Mode S transponder) system. Mode S transponders transmit acquisition squitter (unsolicited downlink transmissions) to permit passive acquisition by interrogators with broad antenna beams, where active acquisition may be hindered by all-call synchronous garble. Examples of such interrogators are an airborne collision avoidance system and an airport surface system.
See Also
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