cricri
Posts: 540
Joined: Sat Oct 02, 1999 12:10 am

Radra Tracking In The Middle Of Nowhere

Fri Nov 03, 2000 2:43 am

Second post, second question  
Let's take us the example of a transatlantic flight from Europe to the United States. I know that there are some "holes" where there is a lack of control towers and so the planes communicate each other giving their position on their respective routes. My question is : is there a continuously radar tracking even in the middle of the atlantic? and if yes, civil or military?
Thanks again for your replies.
 
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RE: Radra Tracking In The Middle Of Nowhere

Fri Nov 03, 2000 5:01 am

Greetings:
Because of the curvature of the earth, radar range is limited. For a ground based radar at sea level, an aircraft flying at 30,000 feet can be detected at 220 nautical miles at the horizon. Placing the radar on a mountain top would extend this a bit farther, but not much. There is a similar problem with VHF/UHF communications blackout because they are also line of sight systems. In the past HF has been used for over ocean communications because it reflects from the ionosphere; however, this is not always reliable. This has left a great deal of the ocean beyond communications and radar range. Fortunately satelite communications are begining to be used for over water air communications; however, space based radar, except for military operation, is still a long way off.
Best regards - apopa
 
cricri
Posts: 540
Joined: Sat Oct 02, 1999 12:10 am

RE: Radra Tracking In The Middle Of Nowhere

Fri Nov 03, 2000 6:15 pm

Tx for the reply

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