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Russian bear v pc-9

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Posted
Isn't a radar a radar

 

As a matter of interest There's 2 types of radar - primary and secondary.

 

Primary (referred to as military radar in that article) is generally only used in civil aviation in the direct vicinity of airports, with a range of about 30miles. A signal is sent out, hits a target and gets reflected back to the receiver. Power intensive as the signal has to be strong enough to go out and back. Also less reliable as rain, mountains etc can reflect signals.

 

Secondary radar is the modern format. A one way signal is sent out and 'interrogates' a transponder on board the aircraft. The transponder then responds to the receiver with its position. If the transponder is off then no signal is returned and therefore the aircraft goes undetected.

Posted (edited)
As a matter of interest There's 2 types of radar - primary and secondary.

 

Primary (referred to as military radar in that article) is generally only used in civil aviation in the direct vicinity of airports, with a range of about 30miles. A signal is sent out, hits a target and gets reflected back to the receiver. Power intensive as the signal has to be strong enough to go out and back. Also less reliable as rain, mountains etc can reflect signals.

 

Secondary radar is the modern format. A one way signal is sent out and 'interrogates' a transponder on board the aircraft. The transponder then responds to the receiver with its position. If the transponder is off then no signal is returned and therefore the aircraft goes undetected.

Even civilian ATC centers have primary surveillance radars for target bearing and range/altitude. This should be visible even if a non-secondary surveillance radar equiped/responding aircraft fails to provide its squawk ident /pressure altitude info. I just thought it was funny the way that the press reported that the Russian aircraft was not squawking for all to see.

Edited by DiveController
Posted
Even civilian ATC centers have primary surveillance radars for target bearing and range/altitude. This should be visible even if a non-secondary surveillance radar equiped/responding aircraft fails to provide its squawk ident /pressure altitude info. I just thought if was funny the way that the press reported that the Russian aircraft was not squawking for all to see.

 

That very well could be the case in the U.S. I know ATC in IRL/UK don't use primary for distances greater than about 30miles, there would certainly not be overlapping coverage. Secondary provides all the info required, inc speeds altitude direction, in fact new systems are being implemented to give a readout of information that is currently only displayed in the cockpit itself.

 

You're right though, It is funny that the press would expect Russian bombers who are probably testing response times to their detection and interception to tell everyone they are there!!

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Posted (edited)
22 minutes ago, heirflick said:

Could you have a word with that lot Tоварищ Boithenofski?Swearing Rage animated emoticon

I'll see what I can co.

 

Whilst discussing aerodynamic braking with somebody, I found this supreme example of the technique from an Il 76 in Malta - perhaps the cost of the brake shoes comes out of his wages?

 

Edited by Broithe
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