[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-187980-en":3,"doc-seo-187980-105":29,"detail-sidebar-cat-1-en-105":91},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":11,"category_id":12,"category_name":13,"doc_title":14,"doc_description":15,"doc_content":16,"file_id":17,"file_url":18,"file_type":19,"file_size":20,"view_count":4,"is_deleted":4,"is_public":11,"is_downloadable":11,"audit_status":11,"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":15,"update_tm":28,"read_time":12},187980,4398048949847,"Eliana","https://ap-avatar.wpscdn.com/avatar/400002536579ef2da7f?_k=1778318612642679267",1,11,"Presentations","NIMBUS 1 - AUTOMATIC PICTURE TRANSMISSION(APT)TV-CAMERA SYSTEM - Introduction","Automatic picture transmission (APT) system for real-time daytime meteorological TV broadcasting, delivering facsimile-ready images to users equipped with ground stations. Flown on Nimbus 1, the first in a series of meteorological satellites launched August 28, 1964, the system provided rapid cloud-cover pictures to local areas within minutes. During the 371-orbit active period, APT transmitted 6999 minutes of video, with Goddard receiving and recording multiple orbits of data, and results were later summarized in users’ catalog materials.","NIMBUS 1  \nAUTOMATIC PICTURE TRANSMISSION(APT)TV-CAMERA SYSTEM  \nGPO PRICE $.                  \nCFSTI PRICE(S)$.                    \nHard copy(HC).           3.00Microfiche(MF)                  ,65  \n)cyEaoy  \noc  \n.  \n(THRU  \nff 653 July 65  \ne  \n67 18640文ACCEsSION NUMBERJ209 wUOA AII710Y  \n(PAGEs)  \nAUGUST 1966  \nGODDARD SPACE FLIGHT CENTERGREENBELT,MD.  \nX-730-66-394  \nNIMBUS 1  \nAUTOMATIC PICTURE TRANSMISSION(APT)TV-CAMERA SYSTEM  \nW.H.Risley  \nSystems Engineering BranchTechnology Directorate  \nJuly 1966  \nGoddard Space Flight CenterGreenbelt,Maryland  \nP&ECEDING PAGE BLANK NOT FLMED.  \nCONTENTS  \nPage  \nINTRODUCTION …………………………………………………………………………………………………1  \nNIMBUS 1 SYSTEM CHARACTERISTICS………………………………………………2  \nSpacecraft Configuration………………………………………………………………………………2  \nOrbit Selection ………………………………………………………………………………………………………4  \nAUTOMATIC PICTURE - TRANSMISSION(APT)SYSTEM ……6  \nSatellite-Borne Equipment…………………………………………………………………6  \nGround-Station Equipment………………………………………………………………………………8  \nPICTURE ANALYSIS………………………………………………………………………………………11  \nDynamic Range………………………………………………………………………………………………………14  \nPicture Resolution………………………………………………………………………………………………14  \nAPT RESULTS FROM NIMBUS 1 ……………………………………………………………12  \nMETHOD OF MEASUREMENT ……………………………………………………………23  \nReferences……………………………………………………………………………………………………………………………………………25  \nILLUSTRATIONS  \nFigure  \nPage  \n1 Nimbus 1 Spacecraft……………………………………………………………………………………………3  \n2 Thor-Agena B-Nimbus Launch Configuration ………………………4  \n3 Nimbus High-Noon Sun-Synchronous Orbit ……………………………5  \n4 Nimbus 1 Orbit ………………………………………………………………………………………………………6  \n5Automatic Picture-Transmission System ……………………………………7  \n6 APT Picture Coverage……………………………………………………………………………………9  \n7 APT Camera Optics Schematic…………………………………………………………10  \n8 APT Antenna………………………………………………………………………………………………………12  \n9 APT Ground-Station Console ………………………………………………………………13  \n10 Graph of Fiducial Pulsewidth ……………………………………………………………………15  \n11 Variation of Picture Resolution vs. Orbits During Use-  \nful Life of Nimbus 1……………………………………………………………………………………………16  \n12 Oscilloscope Photograph Showing Maximum Scene White  \nin Relation to Phasing Bar(Orbit 19,Frame 3)……………………18  \n13 Oscilloscope Photographs Showing the Fiducial Level as,1  \nMinimum Signal or Scene Black(Orbit 6,Frame 1)………19  \n14 Oscilloscope Photographs Showing Fiducial Level as  \nGreater Than Scene Black(Orbit 209,Frame 2; Orbit  \n297,Frame 3)…………………………………………………………………………………………………20  \n15 Oscilloscope Photograph of Facsimile Readout Showing  \nFiducial Marks and Scene White Area……………………………………………21  \n16 APT Picture-Element Ratio vs. Orbits During Useful  \nLife of Nimbus 1……………………………………………………………………………………………………22  \n17 Method of Measurement, Block Diagram ………………………………24  \nNIMBUS 1  \n# AUTOMATIC PICTURE TRANSMISSION(APT)TV-CAMERA SYSTEM\n\nINTRODUCTION  \nThe automatic picture transmission(APT)system was designed forreal-time broadcast of daytime meteorological television pictures,in aformat suitable for facsimile reproduction,to anyone who had the neces-sary ground station equipment,thus providing meteorologists withcloudcover pictures of their immediate area within a few minutes of thetime they were taken.  \nThe APT system was.flown on Nimbus A(designated Nimbus l onachievement of orbit),the first of a series of meteorological satelliteslaunched August 28,1964,at the Western Test Range(WTR),Vanden-berg Air Force Base,California.The orbital performance of Nimbus 1has been discussed in detail by Press(1965).During the 371-orbit activelifetime of Nimbus 1(August 28 to September 24,1964),the APT systemperformance was highly satisfactory and response from the scientificcommunity around the world was enthusiastic.The APT system trans-mitted 6999 minutes of video (about 2000 pictures)to APT ground sta-tions throughout the world.The APT station at Goddard Space FlightCenter(GSFC)in Greenbelt,Maryland,received 36 orbits of informationand recorded 88 frams of pictures.The Nimbus 1 Users¹Catalog(1965)summ","cbCaiuHmA3UXO6l6","https://ap.wps.com/l/cbCaiuHmA3UXO6l6","pdf",11053650,30,"English","en",105,"# Introduction\n# Nimbus 1 System Characteristics\n## Spacecraft Configuration","[{\"question\":\"What was the main purpose of the Nimbus 1 APT TV-camera system?\",\"answer\":\"To provide real-time broadcast of daytime meteorological television pictures in a format suitable for facsimile reproduction to users with the necessary ground equipment.\"},{\"question\":\"Which satellite and mission timing carried the APT system?\",\"answer\":\"The APT system was flown on Nimbus 1, the first of the series of meteorological satellites, launched August 28, 1964.\"},{\"question\":\"How did Nimbus 1 APT output reach ground stations?\",\"answer\":\"The system transmitted video continuously to APT ground stations worldwide; the Goddard Space Flight Center station received multiple orbits and recorded frames of pictures.\"}]","NIMBUS 1 - AUTOMATIC PICTURE TRANSMISSION(APT)TV-CAMERA SYSTEM - Introduction | PDF",1788386556,{"code":4,"msg":30,"data":31},"ok",{"site_id":24,"language":23,"slug":32,"title":14,"keywords":33,"description":15,"schema_data":34,"social_meta":86,"head_meta":88,"extra_data":90,"updated_unix":28},"nimbus-1-automatic-picture-transmissionapttv-camera-system-introduction","",{"@graph":35,"@context":85},[36,53,68],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,47,50],{"item":40,"name":41,"@type":42,"position":11},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":46},"https://docshare.wps.com/template/","Template",2,{"item":48,"name":13,"@type":42,"position":49},"https://docshare.wps.com/template/presentations/",3,{"item":51,"name":14,"@type":42,"position":52},"https://docshare.wps.com/template/nimbus-1-automatic-picture-transmissionapttv-camera-system-introduction/187980/",4,{"url":51,"name":14,"@type":54,"author":55,"headline":14,"publisher":57,"fileFormat":60,"inLanguage":23,"description":15,"dateModified":61,"datePublished":62,"encodingFormat":60,"isAccessibleForFree":63,"interactionStatistic":64},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":40,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05","2026-09-02",true,{"@type":65,"interactionType":66,"userInteractionCount":49},"InteractionCounter",{"@type":67},"ViewAction",{"@type":69,"mainEntity":70},"FAQPage",[71,77,81],{"name":72,"@type":73,"acceptedAnswer":74},"What was the main purpose of the Nimbus 1 APT TV-camera system?","Question",{"text":75,"@type":76},"To provide real-time broadcast of daytime meteorological television pictures in a format suitable for facsimile reproduction to users with the necessary ground equipment.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"Which satellite and mission timing carried the APT system?",{"text":80,"@type":76},"The APT system was flown on Nimbus 1, the first of the series of meteorological satellites, launched August 28, 1964.",{"name":82,"@type":73,"acceptedAnswer":83},"How did Nimbus 1 APT output reach ground stations?",{"text":84,"@type":76},"The system transmitted video continuously to APT ground stations worldwide; the Goddard Space Flight Center station received multiple orbits and recorded frames of pictures.","https://schema.org",{"og:url":51,"og:type":87,"og:title":14,"og:site_name":58,"og:description":15},"article",{"robots":89,"canonical":51},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":92},[93,96,101,106,111,116,121,125,130],{"id":12,"doc_module":11,"doc_module_name":45,"category_name":13,"show_sort_weight":94,"slug":95},90,"presentations",{"id":97,"doc_module":11,"doc_module_name":45,"category_name":98,"show_sort_weight":99,"slug":100},12,"Resumes",80,"resumes",{"id":102,"doc_module":11,"doc_module_name":45,"category_name":103,"show_sort_weight":104,"slug":105},14,"Invoices",70,"invoices",{"id":107,"doc_module":11,"doc_module_name":45,"category_name":108,"show_sort_weight":109,"slug":110},15,"Posters",60,"posters",{"id":112,"doc_module":11,"doc_module_name":45,"category_name":113,"show_sort_weight":114,"slug":115},16,"Social Media",50,"social-media",{"id":117,"doc_module":11,"doc_module_name":45,"category_name":118,"show_sort_weight":119,"slug":120},17,"Forms",40,"forms",{"id":122,"doc_module":11,"doc_module_name":45,"category_name":123,"show_sort_weight":21,"slug":124},18,"Letters","letters",{"id":126,"doc_module":11,"doc_module_name":45,"category_name":127,"show_sort_weight":128,"slug":129},21,"Paper Templates",5,"papers-templates",{"id":131,"doc_module":11,"doc_module_name":45,"category_name":132,"show_sort_weight":4,"slug":133},158,"General","general-158"]