cozmo_im:
Citat:
the_tosic:
@cozmo_im
Laicko pitanje, kako je nestao sa radara? Da li je moguce da avion prosto nestane sa radara, vojnih civilnih?
Sa primarnog radara nije nestao. Sa sekundarnog jeste. Ne znam da li znate razliku izmedju ta dva?
Sekundarni radar prima signal sa transpondera (salje signal ka transponderu, ovaj ima svoj kod jednistven za svaki avion (Friend or Foe sistem), odgovara i na radaru vidis visinu, kurs, brzinu, razne podatke - a kad je transponder ugasen - aviona nema, kao da nije ni postojao.)
http://en.wikipedia.org/wiki/Secondary_surveillance_radar
Primarni radar je klasican radar - ali samo se ugrubo moze proceniti smer ili brzina, a visina jako tesko. Oni su, pregledavajuci snimke primarnog radara (a svi snimci radara se cuvaju izvesno vreme), uspeli da utvrde da je taj avion i dalje leteo i menjao kurs. Medjutim, dosta je ogranicen i dometom i moze da uvati svasta, pa cak i jato ptica pa da izgleda kao i avion.
Primary radar
The rapid wartime development of radar had obvious applications for air traffic control (ATC) as a means of providing continuous surveillance of air traffic disposition. Precise knowledge of the positions of aircraft would permit a reduction in the normal procedural separation standards, which in turn promised considerable increases in the efficiency of the airways system. This type of radar (now called a primary radar) can detect and report the position of anything that reflects its transmitted radio signals including, depending on its design, aircraft, birds, weather and land features. For air traffic control purposes this is both an advantage and a disadvantage. Its targets do not have to co-operate, they only have to be within its coverage and be able to reflect radio waves, but it only indicates the position of the targets, it does not identify them. When primary radar was the only type of radar available, the correlation of individual radar returns with specific aircraft typically was achieved by the controller observing a directed turn by the aircraft. Primary radar is still used by ATC today as a backup/complementary system to secondary radar, although its coverage and information is more limited.
Sto se tice otmice - lako je iskljuciti transponder pre reakcije pilota (ili ako je radjena u dosluhu sa njima, jos lakse), a ako se neko iole razume, moze iskljuciti i ACARS:
http://en.wikipedia.org/wiki/A...ddressing_and_Reporting_System
Sto se tice pozara ili dekompresije ili nekog masivnog tehnickog problema postoji sledece pravilo za posade:
1. Aviate
2. Navigate
3. Communicate
http://www.jeremystone.info/av...y-its-all-going-so-very-wrong/
Dakle - kada se desi zesci problem sa avionom PRVO i OSNOVNO je pokusati da se povrate komande, da se preuzme kontrola nad avionom i stabilizuje let i utvrdi problem. Zatim se sagledava navigaciona situacija i stabilizuju osnovni parametri i na kraju se kontaktira kontrola letenja.
Ako nisu stigli do tacke 3... to je to - a vec se desavalo da posada ne stigne do tacke tri i srusi se avion.
Mozd ih je omeo pozar, pa onesposobio kasnije, mozda izuzetno eksplozivna dekompresija, bomba, ko zna sta. Ili otmica na kraju krajeva.
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