AN/SPQ-9 Radar

See figure 2-10 for a list of weapon systems and their   sensors   related   to   the   Mk   86   GFCS   on   a SPRUANCE class destroyer. AN/SPQ-9 Radar The AN/SPQ-9 Surface Surveillance and Tracking Radar,   developed   by   Northrop   Grumman   Norden Systems,   Melville,   NY,   is   a   track-while-scan   radar used   with   the   Mk-86   Gunfire   Control   system   on surface  combatants.  Since  it  is  a  typical  fire  control radar, we will discussed it in more detail to help you understand the basic function of fire control radar. The AN/SPQ-9B detects sea-skimming missiles at t h e     h o r i z o n ,     ev e n     i n     h e a v y     c l u t t e r,     w h i l e simultaneously  providing  detection  and  tracking  of s u r f a c e   t a r g e t s   a n d   b e a c o n   r e s p o n s e s .   T h e AN/SPQ-9B is available as a stand-alone radar or as a replacement for the AN/SPQ-9 in the Mk 86 Gun Fire Control System, which will be integrated into the Mk 1 Ship Self Defense System (SSDS). The  Radar  Set  AN/SPQ-9B  is  a  high  resolution, X-band narrow beam radar that provides both air and surface tracking information to standard plan position indicator  (PPI)  consoles.  The  AN/SPQ-9B  scans  the air and surface space near the horizon over 360 degrees in   azimuth   at   30   revolutions   per   minute   (RPM). Real-time signal and data processing permit detection, acquisition,   and   simultaneous   tracking   of   multiple targets. The AN/SPQ-9B provides raw and clear plot (processed)   surface   video,   processed   radar   air synthetic   video,   gate   video,   beacon   video   synchro signals indicating antenna relative azimuth, Azimuth Reference Pulses (ARP), and Azimuth Change Pulse (ACP). The radar will maintain its capabilities in the presence  of  clutter  from  the  sea,  rain,  land,  discrete objects, birds, chaff, and jamming. The AN/SPQ-9B has three modes of operation: air, surface, and beacon. The air and surface modes have a s u b m o d e   f o r   C o m b a t   S y s t e m s   t r a i n i n g .   T h e AN/SPQ-9B  complements  high-altitude  surveillance radar in detecting missiles approaching just above the sea surface. The system emits a one-degree beam that, at  a  range  of  approximately  10  nautical  miles,  can detect  missiles  at  altitudes  up  to  500  feet.  Since  the beamwidth   expands   over   distance,   the   maximum altitude will increase at greater ranges. The   air  mode   uses  the  Pulse-Doppler  radar  for detecting   air   targets.   When   the   AN/SPQ-9B   radar detects   an   air   target   and   initiates   a   track,   it   will determine  the  target’s  position,  speed,  and  heading. The air mode has a sector function called the Anti-Ship Missile Defense (ASMD). When the radar is radiating, the air mode is enabled continuously. The   surface   mode   generates   a   separate   surface frequency   and   an   independent   pulse   with   a   pulse repetition  interval  (PRI)  associated  with  a  range  of 40,000 yds. In the surface mode, the AN/SPQ-9B radar has 360-degree scan coverage for surface targets. The radar displays raw and clear plot video, has a submode called  Surface-Moving  Target  Indicator  (MTI),  and operates  concurrently  with  the  air  mode.  While  the radar is in the radiate state, the surface mode is enabled continuously. 2-7 Figure 2-8.—A 5”/54 Mk 45 gun mount.


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