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Development of what was to become IRSTD traces its roots back to 1974, when Spar Aerospace began work on the Shipboard Passive Surveillance and Detection System for the Royal Canadian Navy with assistance from GE Aerospace and CDC.<ref name=”Kamhi-1″ /><ref name=”SPIE-2269″ /> After the US Navy issued requirements for a similar system in 1975,<ref name=”Engel”>{{Cite book |last=Engel |first=Raymond Charles |url=https://apps.dtic.mil/sti/citations/ADA220109 |title=A PC-Based Imaging System for the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) System |date=September 1989 |publisher=[[Naval Postgraduate School]] |location=[[Monterey, California]] |page=6 |language=en}}</ref> negotiations to collaborate on development begun. This resulted in a [[memorandum of understanding]] (MOU) between the [[United States]] and [[Canada]] to build the ADM, which was signed in July 1976. At this time the program was named Infrared Search and Track.<ref name=”Kamhi-1″ /><ref name=”Forecast” /> Trials of the ADM began in May 1978 in [[Halifax, Nova Scotia]] and the unit was transferred to {{HMCS|Algonquin|DDG 283}} in June for sea trials.<ref name=”DND”>{{Cite journal |last=Bowering |first=Ken |date=Spring 2025 |title=The Evolution of Canada’s Post-Second World War Navy – Managing a Fleet in Transition |url=https://publications.gc.ca/collections/collection_2025/mdn-dnd/D12-21-111-eng.pdf |journal=Maritime Engineering Journal |issue=111 |page=16 |via=[[Department of National Defence (Canada)|Department of National Defence]]}}</ref><ref name=”Engel”/> April 1979 saw the ADM sent to [[Key West]] for American land trials, and the unit was installed on {{USS|Kinkaid|DD-965}} that September.<ref name=”Kamhi-1″ /><ref name=”Engel”/> Following this, the unit was shipped to [[Naval Surface Warfare Center Dahlgren Division|Surface Warfare Research Center]] in [[Dahlgren, Virginia]] before being given over to the [[Naval Postgraduate School]] for research use in January 1985.<ref name=”Engel” />

Development of what was to become IRSTD traces its roots back to 1974, when Spar Aerospace began work on the Shipboard Passive Surveillance and Detection System for the Royal Canadian Navy with assistance from GE Aerospace and CDC.<ref name=”Kamhi-1″ /><ref name=”SPIE-2269″ /> After the US Navy issued requirements for a similar system in 1975,<ref name=”Engel”>{{Cite book |last=Engel |first=Raymond Charles |url=https://apps.dtic.mil/sti/citations/ADA220109 |title=A PC-Based Imaging System for the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) System |date=September 1989 |publisher=[[Naval Postgraduate School]] |location=[[Monterey, California]] |page=6 |language=en}}</ref> negotiations to collaborate on development begun. This resulted in a [[memorandum of understanding]] (MOU) between the [[United States]] and [[Canada]] to build the ADM, which was signed in July 1976. At this time the program was named Infrared Search and Track.<ref name=”Kamhi-1″ /><ref name=”Forecast” /> Trials of the ADM began in May 1978 in [[Halifax, Nova Scotia]] and the unit was transferred to {{HMCS|Algonquin|DDG 283}} in June for sea trials.<ref name=”DND”>{{Cite journal |last=Bowering |first=Ken |date=Spring 2025 |title=The Evolution of Canada’s Post-Second World War Navy – Managing a Fleet in Transition |url=https://publications.gc.ca/collections/collection_2025/mdn-dnd/D12-21-111-eng.pdf |journal=Maritime Engineering Journal |issue=111 |page=16 |via=[[Department of National Defence (Canada)|Department of National Defence]]}}</ref><ref name=”Engel”/> April 1979 saw the ADM sent to [[Key West]] for American land trials, and the unit was installed on {{USS|Kinkaid|DD-965}} that September.<ref name=”Kamhi-1″ /><ref name=”Engel”/> Following this, the unit was shipped to [[Naval Surface Warfare Center Dahlgren Division|Surface Warfare Research Center]] in [[Dahlgren, Virginia]] before being given over to the [[Naval Postgraduate School]] for research use in January 1985.<ref name=”Engel” />

Full scale engineering development, which had been approved in June 1981,<ref name=”Engel” /> was heavily delayed by contract negotiations.<ref name=”Spar1981″>{{Cite book |title=Spar Aerospace Limited Annual Report 1981 |year=1981 |page=7 |language=en}}</ref> No development work occurred until a new MOU was signed in January 1983, when the system was renamed IRSTD.<ref name=”Spar1983″>{{Cite book |title=Spar Aerospace Limited Annual Report 1983 |year=1983 |page=2 |language=en}}</ref><ref name=”Kamhi-1″ /> The prime contract between Spar Aerospace and GE Aerospace was signed in August 1984, at which point the system was also given the designation AN/SAR-8.<ref name=”Engel” /><ref name=”Forecast” /> The first EMD unit was delivered to the [[Pacific Missile Test Center]]<ref name=”NewScientist”>{{Cite news |last=Yanchinski |first=Stephanie |date=16 June 1990 |title=Budget squeeze puts the heat on early-warning system |url=https://www.newscientist.com/article/mg12617211-200-technology-budget-squeeze-puts-the-heat-on-early-warning-system/ |access-date=9 November 2025 |work=[[New Scientist]]}}</ref> for land trials in August 1989,<ref name=”Spar1989″>{{Cite book |title=Spar Aerospace Limited Annual Report 1989 |year=1989 |page=5 |language=en}}</ref> which were completed in November 1990.<ref name=”SPIE-2269″ /> The second EMD unit was delivered to the US Navy that December for sea trials,<ref name=”Spar1990″>{{Cite book |title=Spar Aerospace Limited Annual Report 1990 |year=1990 |pages=1, 8 |language=en}}</ref> which were conducted aboard USS ”Kinkaid” and completed by mid 1991.<ref name=”Spar1991″>{{Cite book |title=Spar Aerospace Limited Annual Report 1991 |year=1991 |page=5 |language=en}}</ref> By May 1992, delays and budget overruns had ballooned the total cost for IRSTD to approximately 160 million [[USD]] ({{From USD|160|CAN|r=0|year=1994}} million [[Canadian dollar|CAD]]) for the two EMD units, with full production scheduled to begin in May 1994.<ref name=”Forecast” /> Due to its roots in the 1970’s, the [[focal plane array]]s and supporting electronics were lower performance than their 1980’s successors, leading to a system that was both heavier and substantially more expensive than contemporary designs which had started development later.<ref name=”SPIE-2269″ /><ref name=”Kamhi-1″ /> This was made worse by the project’s more ambitious design criteria, as IRSTD was intended to detect and track targets for the much longer ranged [[RIM-7 Sea Sparrow]] and [[RIM-162 ESSM]] rather than the likes of the [[Goalkeeper CIWS]] targeted by [[Hollandse Signaalapparaten]]’s IRSCAN system.<ref name=”NewScientist” /> Work on the system after this point continued with a focus on research and development, seeing the two EMD units transferred to the Surface Warfare Research Center for use as development aids in 1993.<ref name=”Forecast” /> In June of that year one of the sets was used as part of the [[Ship Self-Defense System]] (SSDS) Mk I trials aboard {{USS|Whidbey Island|LSD-41}} at the [[United States Navy in Vieques, Puerto Rico#Operations on East Vieques|Atlantic Fleet Weapons Test Facility]].<ref name=”Forecast” /><ref>{{Cite journal |last=Prengaman |first=Richard J. |last2=Wetzlar |first2=Edward C. |last3=Bailey |first3=Robert J. |date=2001 |title=Integrated Ship Defense |url=https://secwww.jhuapl.edu/techdigest/content/techdigest/pdf/V22-N04/22-04-Prengaman.pdf |journal=Johns Hopkins APL Technical Digest |volume=22 |issue=4 |pages=523, 524}}</ref> An IRSTD derivative with a new focal plane array known as the horizon IR sensor was slated to see service as part of SSDS Mk III at this time.<ref>{{Cite journal |last=Ousborne |first=Douglas R. |date=1993 |title=Ship Self-Defense Against Air Threats |url=https://secwww.jhuapl.edu/techdigest/content/techdigest/pdf/V14-N02/14-02-Ousborne.pdf |journal=Johns Hopkins APL Technical Digest |volume=14 |issue=2 |pages=135, 136}}</ref>

Full scale engineering development, which had been approved in June 1981,<ref name=”Engel” /> was heavily delayed by contract negotiations.<ref name=”Spar1981″>{{Cite book |title=Spar Aerospace Limited Annual Report 1981 |year=1981 |page=7 |language=en}}</ref> No development work occurred until a new MOU was signed in January 1983, when the system was renamed IRSTD.<ref name=”Spar1983″>{{Cite book |title=Spar Aerospace Limited Annual Report 1983 |year=1983 |page=2 |language=en}}</ref><ref name=”Kamhi-1″ /> The prime contract between Spar Aerospace and GE Aerospace was signed in August 1984, at which point the system was also given the designation AN/SAR-8.<ref name=”Engel” /><ref name=”Forecast” /> The first EMD unit was delivered to the [[Pacific Missile Test Center]]<ref name=”NewScientist”>{{Cite news |last=Yanchinski |first=Stephanie |date=16 June 1990 |title=Budget squeeze puts the heat on early-warning system |url=https://www.newscientist.com/article/mg12617211-200-technology-budget-squeeze-puts-the-heat-on-early-warning-system/ |access-date=9 November 2025 |work=[[New Scientist]]}}</ref> for land trials in August 1989,<ref name=”Spar1989″>{{Cite book |title=Spar Aerospace Limited Annual Report 1989 |year=1989 |page=5 |language=en}}</ref> which were completed in November 1990.<ref name=”SPIE-2269″ /> The second EMD unit was delivered to the US Navy that December for sea trials,<ref name=”Spar1990″>{{Cite book |title=Spar Aerospace Limited Annual Report 1990 |year=1990 |pages=1, 8 |language=en}}</ref> which were conducted aboard USS ”Kinkaid” and completed by mid 1991.<ref name=”Spar1991″>{{Cite book |title=Spar Aerospace Limited Annual Report 1991 |year=1991 |page=5 |language=en}}</ref> By May 1992, delays and budget overruns had ballooned the total cost for IRSTD to approximately 160 million [[USD]] ({{From USD|160|CAN|r=0|year=1994}} million [[Canadian dollar|CAD]]) for the two EMD units, with full production scheduled to begin in 1994.<ref name=”Forecast” /> Due to its roots in the 1970’s, the [[focal plane array]]s and supporting electronics were lower performance than their 1980’s successors, leading to a system that was both heavier and substantially more expensive than contemporary designs which had started development later.<ref name=”SPIE-2269″ /><ref name=”Kamhi-1″ /> This was made worse by the project’s more ambitious design criteria, as IRSTD was intended to detect and track targets for the much longer ranged [[RIM-7 Sea Sparrow]] and [[RIM-162 ESSM]] rather than the likes of the [[Goalkeeper CIWS]] targeted by [[Hollandse Signaalapparaten]]’s IRSCAN system.<ref name=”NewScientist” /> Work on the system after this point continued with a focus on research and development, seeing the two EMD units transferred to the Surface Warfare Research Center for use as development aids in 1993.<ref name=”Forecast” /> In June of that year one of the sets was used as part of the [[Ship Self-Defense System]] (SSDS) Mk I trials aboard {{USS|Whidbey Island|LSD-41}} at the [[United States Navy in Vieques, Puerto Rico#Operations on East Vieques|Atlantic Fleet Weapons Test Facility]].<ref name=”Forecast” /><ref>{{Cite journal |last=Prengaman |first=Richard J. |last2=Wetzlar |first2=Edward C. |last3=Bailey |first3=Robert J. |date=2001 |title=Integrated Ship Defense |url=https://secwww.jhuapl.edu/techdigest/content/techdigest/pdf/V22-N04/22-04-Prengaman.pdf |journal=Johns Hopkins APL Technical Digest |volume=22 |issue=4 |pages=523, 524}}</ref> An IRSTD derivative with a new focal plane array known as the horizon IR sensor was slated to see service as part of SSDS Mk III at this time.<ref>{{Cite journal |last=Ousborne |first=Douglas R. |date=1993 |title=Ship Self-Defense Against Air Threats |url=https://secwww.jhuapl.edu/techdigest/content/techdigest/pdf/V14-N02/14-02-Ousborne.pdf |journal=Johns Hopkins APL Technical Digest |volume=14 |issue=2 |pages=135, 136}}</ref>

Latest revision as of 19:17, 22 November 2025

The AN/SAR-8 Infrared Search and Target Designation System (IRSTD) was an infrared search and track (IRST) system developed jointly by General Electric Aerospace, Spar Aerospace, Computing Devices Canada (CDC), and Scientific Atlanta for the the United States Navy and Royal Canadian Navy during the Cold War.[1] The system provided increased anti-ship missile defense capabilities to warships by detecting sea skimming missiles with very small radar signatures that were otherwise invisible to the ship’s radar.[1][2] The AN/SAR-8 was designed to interface with both the Improved Basic Point Defense Missile System (IBPDMS)[3] and Aegis Combat System from Baseline 6 Phase III onwards.[4][5] It was never fielded, with only one Advanced Development Model (ADM) two Engineering and Manufacturing Development (EMD) units being built prior to cancellation.[3]

In accordance with the Joint Electronics Type Designation System (JETDS), the “AN/SAR-8” designation represents the eighth design of an Army-Navy electronic device for a surface ship infrared receiver system. The JETDS system is also used to name some NATO and all Department of Defense electronic systems.

The system was intended to provide a 360-degree automatic detection and track capability against all airborne threats, with an additional capability to manually track surface targets.[1]

Development of what was to become IRSTD traces its roots back to 1974, when Spar Aerospace began work on the Shipboard Passive Surveillance and Detection System for the Royal Canadian Navy with assistance from GE Aerospace and CDC.[2][1] After the US Navy issued requirements for a similar system in 1975,[6] negotiations to collaborate on development begun. This resulted in a memorandum of understanding (MOU) between the United States and Canada to build the ADM, which was signed in July 1976. At this time the program was named Infrared Search and Track.[2][3] Trials of the ADM began in May 1978 in Halifax, Nova Scotia and the unit was transferred to HMCS Algonquin (DDG 283) in June for sea trials.[7][6] April 1979 saw the ADM sent to Key West for American land trials, and the unit was installed on USS Kinkaid (DD-965) that September.[2][6] Following this, the unit was shipped to Surface Warfare Research Center in Dahlgren, Virginia before being given over to the Naval Postgraduate School for research use in January 1985.[6]

Full scale engineering development, which had been approved in June 1981,[6] was heavily delayed by contract negotiations.[8] No development work occurred until a new MOU was signed in January 1983, when the system was renamed IRSTD.[9][2] The prime contract between Spar Aerospace and GE Aerospace was signed in August 1984, at which point the system was also given the designation AN/SAR-8.[6][3] The first EMD unit was delivered to the Pacific Missile Test Center[10] for land trials in August 1989,[11] which were completed in November 1990.[1] The second EMD unit was delivered to the US Navy that December for sea trials,[12] which were conducted aboard USS Kinkaid and completed by mid 1991.[13] By May 1992, delays and budget overruns had ballooned the total cost for IRSTD to approximately 160 million USD (219 million CAD) for the two EMD units, with full production scheduled to begin in 1994.[3] Due to its roots in the 1970’s, the focal plane arrays and supporting electronics were lower performance than their 1980’s successors, leading to a system that was both heavier and substantially more expensive than contemporary designs which had started development later.[1][2] This was made worse by the project’s more ambitious design criteria, as IRSTD was intended to detect and track targets for the much longer ranged RIM-7 Sea Sparrow and RIM-162 ESSM rather than the likes of the Goalkeeper CIWS targeted by Hollandse Signaalapparaten‘s IRSCAN system.[10] Work on the system after this point continued with a focus on research and development, seeing the two EMD units transferred to the Surface Warfare Research Center for use as development aids in 1993.[3] In June of that year one of the sets was used as part of the Ship Self-Defense System (SSDS) Mk I trials aboard USS Whidbey Island (LSD-41) at the Atlantic Fleet Weapons Test Facility.[3][14] An IRSTD derivative with a new focal plane array known as the horizon IR sensor was slated to see service as part of SSDS Mk III at this time.[15]

  1. ^ a b c d e f Brown, T. G.; Lafleur, Philippe (1994). “IRST Modelling and Validation”. Society of Photo-Optical Instrumentation Engineers. 2269 (Infrared Technology XX): 188–190 – via SPIE.
  2. ^ a b c d e f Kamhi, Martin (1993). “Opening remarks to IRST session”. Society of Photo-Optical Instrumentation Engineers. 2020 (Infrared Technology XIX): 66 – via SPIE.
  3. ^ a b c d e f g “SAR-8/IRST”. Forecast International: 1–3. February 1998 – via Forecast International.
  4. ^ Fortune, Randall H.; Perkinson, Brian T.; Staiman, Robert C. (2009). “Getting AEGIS to Sea: The AEGIS Ships”. Naval Engineers Journal: 167 – via Ingenta.
  5. ^ Frazer, R. Kelly; Hanson Jr., James M.; Leumas, Michael J.; Ratliff, Clifford L.; Reinecke, Olivia M.; Roe, Charles L. (2001). “Evolved Seasparrow Missile Program” (PDF). Johns Hopkins APL Technical Digest. 22 (4): 569, 570.
  6. ^ a b c d e f Engel, Raymond Charles (September 1989). A PC-Based Imaging System for the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) System. Monterey, California: Naval Postgraduate School. p. 6.
  7. ^ Bowering, Ken (Spring 2025). “The Evolution of Canada’s Post-Second World War Navy – Managing a Fleet in Transition” (PDF). Maritime Engineering Journal (111): 16 – via Department of National Defence.
  8. ^ Spar Aerospace Limited Annual Report 1981. 1981. p. 7.
  9. ^ Spar Aerospace Limited Annual Report 1983. 1983. p. 2.
  10. ^ a b Yanchinski, Stephanie (16 June 1990). “Budget squeeze puts the heat on early-warning system”. New Scientist. Retrieved 9 November 2025.
  11. ^ Spar Aerospace Limited Annual Report 1989. 1989. p. 5.
  12. ^ Spar Aerospace Limited Annual Report 1990. 1990. pp. 1, 8.
  13. ^ Spar Aerospace Limited Annual Report 1991. 1991. p. 5.
  14. ^ Prengaman, Richard J.; Wetzlar, Edward C.; Bailey, Robert J. (2001). “Integrated Ship Defense” (PDF). Johns Hopkins APL Technical Digest. 22 (4): 523, 524.
  15. ^ Ousborne, Douglas R. (1993). “Ship Self-Defense Against Air Threats” (PDF). Johns Hopkins APL Technical Digest. 14 (2): 135, 136.

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