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Digital   Stroke   Symbol   Generation
SUMMARY-BASIC DISPLAY DEVICES AND SYSTEMS

Fire Controlman Volume 05-Display Systems and Devices
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zero,   one,   two,   or   three   grid   points. The   Z (unblank)   signal   unblanks   the   beam   when   active. The   W   (wait)   output   is   used   to   ensure   the completion   of   a   stroke   before   the   start   of   the   next stroke.  The  W  fiction  is  normally  used  to  ensure the  CRT  beam  is  in  the  proper  position  before  the beam   is   unblanked,   blanked,   or   makes   a   major change   in   direction.   This   prevents   distortion   of   the symbol   that   could   result   if   the   beam   has   not completely   finished   a   stroke   or   has   not   been completely   repositioned. Referring  to  figure  1-12,  the  PROM  is  addressed and   the   output   is   translated.   In   this   example,   the first  stroke  (stroke  zero)  positions  the  CRT  beam three  grid  spaces  in  the  -X  direction  and  the  beam  is blanked.  Upon  completion  of  this  stroke,  the  next address   is   read   and   translated.   Strokes   one,   two, and  three  each  cause  the  beam  to  be  deflected  one grid  space  in  the  +X  direction  and  two  grid  spaces in   the   +Y   (up)   direction   while   the   beam   is unblanked.   At   the   end   of   stroke   three,   there   is   a pause  (W)  so  the  beam  can  finish  the  stroke  before changing  direction. Strokes  four,  five,  and  six  each  cause  the  beam to  move  one  grid  space  in  the  +X  direction  and  two grid  spaces  in  the  -Y  (down)  direction.  Again  at  the end  of  stroke  six,  there  is  a  pause  (W)  to  ensure  that the   beam   deflection   is   complete. When   the   PROM   address   for   stroke   seven   is read,   no   outputs   are   found   active.   This   condition signals   the   logic   that   the   symbol   is   complete,   and the   symbol   generator   moves   to   the   next   fictional time  period,  as  shown  in  table  1-1. DISPLAY   SYSTEMS The  combat  direction  systems  (CDS)  in  use  on most  ships  evolved  from  the  original  NTDS  systems. These  systems  developed  the  standards  for  several digital  computer  protocols,  and  the  term  NTDS  is still   used   to   define   several   of   these   protocols.   The display  sub-system  is  the  largest  part  of  the  CDS system. Two  major  tactical  display  systems  are  currently used  in  the  fleet.  These  are  the  Data  Display  Group AN/UYA-4(V)   and   the   Computer   Display   Set AN/UYQ-21(v). Within   each   system   different versions   are   tailored   for   each   class   of   ship, according  to  the  mission  of  the  ship. DATA  DISPLAY  GROUP  AN/UYA-4(V) The   Data   Display   Group   AN/UYA-4(V)   is   the most  widely  used  system  currently  in  the  fleet.  It was  developed  to  refine  the  limitations  of  the AN/SYA-4(V)  and  the  AN/UYA-1(V)  systems.  The AN/UYA-4(V)  display  group  uses  third  generation electronics  (integrated  circuit)  for  all  logic  functions. The   function   of   the   Data   Display   Group AN/UYA-4(V)  is  to  provide  a  real-time  visual picture  of  the  tactical  situation.  To  perform  this requirement,  the  systems  must  be  able  to  accomplish several   tasks   including   the   following: Sensor   data   distribution   and   display Tactical   data   distribution   and   display System  simulation  and  testing Figure  1-13  illustrates  a  typical  AN/UYA-4(V) display  group.  Sensor  position  data  is  received  from the   ship’s   sensor   platforms   (radar   and   sonar)   and sent   to   a   converter   for   conversion   into   a   form   that can   be   used   by   the   display   console.   The   converted position  data  is  routed  to  the  display  console  through a   distribution   switchboard.   Sensor   video   data   is routed  to  the  display  consoles  through  the  same switchboard. Tactical   data   is   digital   data   received   from   or transmitted   to   the   system   computer.   Tactical   data from  the  computer  is  used  by  the  display  system  to generate  symbol  displays  and  alert/switch  indications on   the   display   consoles. Tactical  data  sent  to  the computer  is  the  result  of  some  type  of  operator action  at  the  display  console. System  test  is  accomplished  with  the  system computer  and  the  video  signals  simulator  (VSS).  As illustrated  in  figure  1-13,  the  VSS  can  simulate  a radar  input  to  the  switchboard  to  aid  the  technician in   fault   isolation   or   provide   simulated   data   for operator   training. The   tactical   data   paths   can   be tested   using   the   various   software   programs   (POFA, PEFT,  etc.)  designed  to  run  with  the  system  on  your ship. 1-13






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