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SENSOR   DATA   DISTRIBUTION   AND DISPLAY
RADAR   DATA   DISTRIBUTION Table 3-1.The MODE SELECTOR Switch Functions SWITCHBOARD   (RDDS)

Fire Controlman Volume 05-Display Systems and Devices
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Figure 3-1.—The AN/UYA-4(V) data display system. The  DC  and  DU  pulse   trains   are   generally developed  by  using  the  sine  and  cosine  of  the  antenna angle.  The  sine  and  cosine  of  the  antenna  angle  will define   the   angle   in   a   90-degree   quadrant.   The   sign bits (sign of  DC,  sign of DU)  will  determine  in  which quadrant   the   sweep   will   repainted.   The   quadrants and  required  sign  bits  are  illustrated  in  figure  3-2. The DC and DU pulse trains are sent to the display console  where  they  cause  a  pair  of  digital  counters  to increment   one   time   for   each   pulse.   The   number   of pulses  between  the  zero  mile  range  mark  (start  of sweep)  and  the  end  of  sweep  signal  denotes  the  radar sweep  angle,  and  the  spaces  between  pulses  indicate the  range  of  the  sweep.    For   example,   the   sine   and cosine  of  45  degrees  are  equal  to  each  other.  To  paint a  sweep  at  45  degrees,  the  sign  of  DC  and  the  sign  of DU  will  both  be  positive  indicating  quadrant  one.  In developing  the  DC and DU pulse  trains,  the  number  of pulses  for  each  would  be  equal.  This  will  increment 3-3 Figure 3-2.—The X/Y quadrants of a CRT.






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