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| Keywords: 1961 Eyes of the North - minute 4-51 -- BMEWS arcs and Q points.png en The Thule J-site BMEWS station's detection arcs of 200°<ref> Cite news Hanley Charles J--Associated Press August 17 1987 Soviets Eskimos protest Thule radar http //news google com/newspapers nid 1454 dat 19870817 id X0lOAAAAIBAJ sjid EBQEAAAAIBAJ pg 6837 867926 Google news archive Star-News 2014-03-09 The radar a Phased Array Warning System ¦can see 3 200 miles 200 miles farther than the old system and has a 240-degree arc ¦40 degrees more than the old </ref> was a missile warning fence created by 4 radars' separate arcs each AN/FPS-50 created 2 arcs shown centered at 3 5° and 7° elevation BMW exagerated in illustration Each arc was created by a smaller radar beam ~1° wide x 3 5° high at a horizontal sweep rate ¦fast enough that a missile or satellite cannot pass through ¦undetected BMW e g Lower Fan and Upper Fan --concerns in 1962 of ERBM's Extended Range Ballistic Missiles were that missile speeds after burnout would be higher than the initially-deployed Soviet ICBMs NORAD1958B and prevent the sweeping fans revisit time of 2 sec Skolnik from detecting the missiles A missile within the lower arc ~1 75-5 25° elevation would be detected at a Lower Fan Q Point black dot and then by the upper fan black dot with jagged outline which allowed the impact area to be estimated from where the object crossed the two fans and the elapsed time interval between fan crossings BMW displays showed the uncertain impact point as an elliptical area The free flight range of the missile outside the atmosphere burnout to reentry depends on the flight path angle and on the missile's parametric value of Q calculated from altitude and speed--additional ballistic range within the atmosphere to an estimated burst altitude was determined from computerized look-up tables in the Missile Impact Predictor BMW Eyes of the North film USAF 1961 Images from the US Air Force PD-USGov | ||||
