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STATIC   PARALLAX   CORRECTIONS
TRANSITS

Fire Controlman Volume 04-Fire Control Maintenance Concepts
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Elevation  angles  also  are  affected  by  displace- ments   between   reference   frames.   If   elevation   angles measured  in  one  frame  are  to  be  used  in  another frame,  they  must  first  be  corrected  for  parallax.  The magnitudes  of  parallax  corrections  in  train  and  eleva- tion  vary  considerably  with  target  bearing,  elevation, and  range,  and  the  magnitude  and  orientation  of  the distance   between   the   reference   frames. The  basic  point  to  remember  is  that  whenever  two reference  frames  are  displaced  from  each  other,  data measured  from  one  frame  is,  in  general,  not  equal  to data  measured  from  the  other  frame.  If  the  differences are  significant,  data  measured  in  one  frame  must  be corrected  for  parallax  before  it  is  applied  in  other frames. Angular   Displacement Connections   arising   from   reference   directions   or reference   planes   not   being   parallel   are   called   rota- tional   corrections.   If  the  reference  lines  are  both  in  a plane   that   is   perpendicular   to   both   reference   planes, but  the  reference  planes  are  not  parallel,  the  bearing angles  and  the  elevation  angles  are  different. When   the   angle   between   the   reference   planes   is relatively   small,   the   major   difference   is   in   the   ele- vation  angles;  the  difference  in  the  bearing  angles  is usually  small  enough  to  be  ignored. Figure   3-6   shows   rotational   corrections   between unparallel   planes. Figure  3-6.—Rotational  corrections  between  unparallel  planes. ALIGNMENT  EQUIPMENT Alignment  equipment  is  used  by  shipboard  and shipyard  personnel  to  align  combat  systems  elements. Combat  systems  alignment  checks  and  adjustments are   usually   accomplished   with   tools   and   test   equip- ment  normally  found  aboard  ship.  Because  of  required combat  systems  accuracy,  special-purpose  instruments are   sometimes   required   for   adjustments. This  section  briefly  describes  the  most  commonly used  alignment  equipment,  such  as  transits,  theod- 3-5






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