[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-227913-en":3,"doc-seo-227913-105":30,"detail-sidebar-cat-0-en-105":97},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},227913,687197100911,"Himbo","https://ap-avatar.wpscdn.com/avatar/a000239b6f1da00475?x-image-process=image/resize,m_fixed,w_180,h_180&k=1785132997149421697",8,"Research & Report","PRECISE TERRESTRIAL TIME - A MEANS FOR IMPROVED BALLISTIC MISSILE GUIDANCE ANALYSIS","Significant improvements in ballistic missile guidance performance require more precise timing standards for analyzing test data. Because missile dynamics limit the precision of onboard timing sources, timing is achieved at ground instrumentation sites. A Space and Missile Test Center (SAMTEC) approach—adapted from telemetry timing correlation work—has been designated the Timing Insertion Unit (TIU), enabling tenth-microsecond time-tag resolution and better than 0.5 microsecond intersite relative accuracy after corrections.","# PRECISE TERRESTRIAL TIME-A MEANS FOR IMPROVEDBALLISTIC MISSILE GUIDANCE ANALYSIS\n\nE1don E.Ehrsan(Space And Missile Test Center),Stephen A.Cressvell,George R.McKelvey,andFrank L.Matthews(ITT Federal Electric Corpor-ation),Vandenberg AFB,California  \n## ABSTRACT\n\nSignificant improvements in ballistic missile guidance performancehas necssitated the guidance systems analysis community to adoptmore precise timing standards for the evaluation of test data.Todate,data timing is achieved at the ground instrumentation sitessince the missile dynamics are too lemanding for currently avail-able high precision missile borne ciming sources.In the pastfive years as noted in the 1973 PTTI paper,\"Precise Timing Cor-relation in Telemetry Recording and Processing Systems\",accuracyimprovements in evaluation of guidance systems were expected toexceed the IRIG timing techniques used in time tagging guidancetelemetry data.An approach developed by Space and Missile TestCenter(SAMTEC)to improve the ground instrumentation time taggingaccuracy has been adapted to support the Minuteman ICBM programand has been designated the Timing Insertion Unit(TIU).  The TIUtechnique produces a telemetry data time tagging resolution of onetenth of a microsecond,with a relative intersite accuracy aftercorrections to better than 0.5 microsecond.Metric tracking posi-tion and velocity data(range,azimuth,elevation and range ratealso used in missile guidance system analysis can be correlated towithin ten microseconds of the telemetry guidance x,y,z and文，y,ż data.  This requires precise timing synchronization betweenthe metric and telemetry instrumentation sites.  The timing syn-chronization can be achieved by using the radar automatic phasingsystem time correlation methods.  O+er time correlation techni-ques such as Television(TV)Line-10 and the Geostationary Opera-tional Environmental Satellites(GOES)terrestial timing receiversare being considered.  With the continuing improvement of ballis-tic missile gu:dance performance,on-board clocking stability ofone part in 10³may he required.  This increased on-board stabil-ity will influence improvements in terrestial time precision andaccuracy.  \n·  \n## INTRODUCTION\n\nThe Air Forces Space and Missile Test Center(SAMTEC),headquar-tered at Vandenberg Air Force Base,California,manages,operatesand maintains the Western Test Range(WTR)and the Eastern TestRange(ETR)in support of Department of Defense(DOD),NationalAeronautics and Space Administration(NASA)and other ballistic,space and aeronautical user programs.Figure 1 shows the geogra-phical area of the WTR which extends from the west coast to 90 de-grees East longitude in the Indian Ocean and includes instrumenta-tion support provided by the U.S.Navy Pacific Missile Test Center(PMTC),NASA,U.S.Air Force Satellite Control Facility(AFSCF)and the U.S.Army Kwajaleir Missile Test Range(KMR).This paperdescribes the application of precise time synchronization techni-ques by SAMTEC to provide support for DOD bəllistic weapon systemuser programs with a need to achieve improved ballistic missile  \ni:ertial guidance system analysis.  The SAMTEC has determincdthrough analysis of inertial guidance telemetry data that the mis-sile guidance system clock stability is affected by flight dynam-ics during the launch and post boost burn.because of this clockstability problem,another means of providing timing synchronization was required.  SAMTEC has recently designed and developedequipment and procedures which allow relative time synchronizationbetween telemetry receiving sites to within 0.5 microsecond andthe time tagging of recorded telemetry data to a resc ition of 0.1microsecond.  Metric radar sites are synchronized t within onemicrosecond relative between radar sites and telemetry sites.Figure 2 shows the geographical relationship of westcoast uprange(SAMTEC and PMTC)telemetry receive sites anu metric radar siteswhich support ballistic missiles launched from Vandenberg AirForce Base,California.  \n#","cbCaipMqkmvp2ECY","https://ap.wps.com/l/cbCaipMqkmvp2ECY","pdf",516961,1,16,"English","en",105,"# ABSTRACT\n# INTRODUCTION\n## Background","[{\"question\":\"Why are more precise timing standards needed for ballistic missile guidance analysis?\",\"answer\":\"Improvements in guidance performance increase the required timing accuracy for evaluating test data, driving the need for finer timing resolutions.\"},{\"question\":\"Why is timing primarily achieved using ground instrumentation rather than onboard sources?\",\"answer\":\"Missile dynamics make current onboard timing sources too demanding to achieve the necessary high precision, so ground sites provide the timing basis.\"},{\"question\":\"What performance does the Timing Insertion Unit (TIU) provide?\",\"answer\":\"The TIU technique produces telemetry time tagging resolution on the order of 0.1 microsecond and achieves better than 0.5 microsecond relative intersite accuracy after corrections.\"}]","PRECISE TERRESTRIAL TIME - A MEANS FOR IMPROVED BALLISTIC MISSILE GUIDANCE ANALYSIS | PDF",1789016894,40,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":92,"head_meta":94,"extra_data":96,"updated_unix":28},"precise-terrestrial-time-a-means-for-improved-ballistic-missile-guidance-analysis","",{"@graph":36,"@context":91},[37,54,74],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/research-report/",3,{"item":52,"name":13,"@type":43,"position":53},"https://docshare.wps.com/document/precise-terrestrial-time-a-means-for-improved-ballistic-missile-guidance-analysis/227913/",4,{"url":52,"name":13,"@type":55,"image":56,"author":61,"headline":13,"publisher":63,"fileFormat":66,"inLanguage":23,"description":14,"dateModified":67,"datePublished":68,"encodingFormat":66,"isAccessibleForFree":69,"interactionStatistic":70},"DigitalDocument",{"url":57,"@type":58,"width":59,"height":60},"https://docshare.wps.com/thumbnails/precise-terrestrial-time-a-means-for-improved-ballistic-missile-guidance-analysis/227913.png","ImageObject",300,407,{"name":9,"@type":62},"Person",{"url":41,"name":64,"@type":65},"DocShare","Organization","application/pdf","2026-09-11","2026-09-10",true,{"@type":71,"interactionType":72,"userInteractionCount":20},"InteractionCounter",{"@type":73},"ViewAction",{"@type":75,"mainEntity":76},"FAQPage",[77,83,87],{"name":78,"@type":79,"acceptedAnswer":80},"Why are more precise timing standards needed for ballistic missile guidance analysis?","Question",{"text":81,"@type":82},"Improvements in guidance performance increase the required timing accuracy for evaluating test data, driving the need for finer timing resolutions.","Answer",{"name":84,"@type":79,"acceptedAnswer":85},"Why is timing primarily achieved using ground instrumentation rather than onboard sources?",{"text":86,"@type":82},"Missile dynamics make current onboard timing sources too demanding to achieve the necessary high precision, so ground sites provide the timing basis.",{"name":88,"@type":79,"acceptedAnswer":89},"What performance does the Timing Insertion Unit (TIU) provide?",{"text":90,"@type":82},"The TIU technique produces telemetry time tagging resolution on the order of 0.1 microsecond and achieves better than 0.5 microsecond relative intersite accuracy after corrections.","https://schema.org",{"og:url":52,"og:type":93,"og:title":13,"og:site_name":64,"og:description":14},"article",{"robots":95,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":98},[99,103,107,111,116,121,125,128,133,136,140],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":100,"show_sort_weight":101,"slug":102},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":104,"show_sort_weight":105,"slug":106},"Literature",80,"literature",{"id":53,"doc_module":4,"doc_module_name":46,"category_name":108,"show_sort_weight":109,"slug":110},"Exam",70,"exam",{"id":112,"doc_module":4,"doc_module_name":46,"category_name":113,"show_sort_weight":114,"slug":115},5,"Comic",60,"comic",{"id":117,"doc_module":4,"doc_module_name":46,"category_name":118,"show_sort_weight":119,"slug":120},6,"Technology",50,"technology",{"id":122,"doc_module":4,"doc_module_name":46,"category_name":123,"show_sort_weight":29,"slug":124},7,"Healthcare","healthcare",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":126,"slug":127},30,"research-report",{"id":129,"doc_module":4,"doc_module_name":46,"category_name":130,"show_sort_weight":131,"slug":132},9,"Religion & Spirituality",20,"religion-spirituality",{"id":131,"doc_module":4,"doc_module_name":46,"category_name":134,"show_sort_weight":131,"slug":135},"World Cup","world-cup",{"id":137,"doc_module":4,"doc_module_name":46,"category_name":138,"show_sort_weight":137,"slug":139},10,"Lifestyle","lifestyle",{"id":141,"doc_module":4,"doc_module_name":46,"category_name":142,"show_sort_weight":112,"slug":143},19,"General","general"]