[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-151788-en":3,"doc-seo-151788-105":30,"detail-sidebar-cat-0-en-105":92},{"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},151788,1099514067415,"Rowan","https://ap-avatar.wpscdn.com/avatar/100002539d78ffe74a7?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779092875211072502",6,"Technology","MULTI-PIXEL HIGH-RESOLUTION THREE-DIMENSIONAL IMAGING RADAR - High-frequency FMCW with multiplexed beam","A three-dimensional imaging radar operating at high frequency (e.g., 670 GHz) is disclosed, using low phase-noise synthesizers and a fast chirper to produce a frequency-modulated continuous-wave (FMCW) waveform. The system employs a multiplexed beam to obtain range information simultaneously on multiple pixels of a target. A transmit beam is divided by a hybrid coupler into multiple multiplexed transmit beams, reflected by the target and returned as a single receive beam, then demultiplexed and processed to extract per-pixel range information. Temporal and spatial differentiation via optics provides distinct intermediate frequencies for different pixel ranges, with optional differentiated polarizations for collinear transmit beams.","(54)MULTI-PIXELHIGH-RESOLUTION  \nTHREE-DIMENSIONAL IMAGING RADAR  \n(75)Inventors:Ken B.Cooper,La Crescenta,CA(US);Robert J.Dengler,Walnut,CA(US);Peter H.Siegel,La Canada,CA(US);Goutam Chattopadhyay,Pasadena,CA(US);John S.Ward,Roanoke,IN(US);Nuria Llombart Juan,Alboraya(ES);Tomas E.Bryllert,Göteborg(SE);Imran Mehdi,South Pasadena,CA(US);Jan A.Tarsala,Arcadia,CA(US)  \n(73)Assignee:California Institute of Technology,Pasadena,CA(US)  \n(*)Notice:Subject to any disclaimer,the term of thispatent is extended or adjusted under 35U.S.C.154(b)by 336 days.  \n(22)Filed:  \n:Oct.15,2009  \n(65)  \nPrior Publication Data  \nRelated U.S.Application Data  \n(60)Provisional application No.61/196,199,filed on Oct  \n15,2008.  \n(51)IntCl.  \nG01S13/89  \n(2006.01)  \nG01C 3/08  \n(2006.01)  \n(52)U.S.Cl.………342/179;342/180;342/22;342/27;342/188;342/196;356/456;356/4.01  \n(58)Field of Classification Search……………342/179,342/180,22,27,52,54,188,196;356/327,356/4.01,456,5.09,5.15  \nU.S.PATENT DOCUMENTS  \n(Continued)  \n20 Claims,9 Drawing Sheets  \n(56)  \nReferences Cited  \n5,202,692 A*4/1993 Huguenin et al.………342/179  \n5,384,573 A*  1/1995 Turpin ………  …………342/179  \n5,610,705 A*  3/1997 Brosnan et al.…………356/28.5  \n5,736,958 A*4/1998 Turpin ……………………342/1795,751,243 A*  5/1998 Turpin ……………………342/179  \n7,609,198 B2*10/2009 Chang……………………342/59  \n7,687,773 B2*3/2010 Siegel et al.………………250/330(Continued)  \n(74)Attorney,Agent,or Firm—Canady &Lortz LLP;Bradley K.Lortz  \n(21)Appl.No.:12/580,210  \n(57)  \nUS 2010/0090887 A1 Apr.15,2010  \nSee application file for complete search history.  \nUS 8,144,052 B2  \n(10)Patent No.:  \nMar.27,2012  \n(45)Date of Patent:  \n4,901,084 A*2/1990 Huguenin et al.  ………342/179  \nFOREIGN PATENT DOCUMENTS  \nFR  \n2608284 A1*6/1988  \nPrimary Examiner—John Sotomayor  \n# ABSTRACT\n\nA three-dimensional imaging radar operating at high fre-quency e.g.,670 GHz radar using low phase-noise synthesiz-ers and a fast chirper to generate a frequency-modulatedcontinuous-wave(FMCW)waveform,is disclosed that oper-ates with a multiplexed beam to obtain range informationsimultaneously on multiple pixels of a target.A source trans-mit beam may be divided by a hybrid coupler into multipletransmit beams multiplexed together and directed to bereflected offatarget and return as a singlereceive beam whichis demultiplexed and processed to revealrange information ofseparate pixels of the target associated with each transmitbeam simultaneously.The multiple transmit beams may bedeveloped with appropriate optics to be temporally and spa-tially differentiated before being directed to the target.Tem-poral differentiation corresponds to a different intermediatefrequencies separating the range information of the multiplepixels.Collinear transmit beams having differentiated polar-izations may also be implemented.  \nUS 8,144,052 B2  \nU.S.PATENT DOCUMENTS  \n7,746,450 B26/2010 Willner et al.……………356/28  \n7,899,432 B23/2011 Chattopadhyay et al....455/327  \n骨  \n7,978,337 B27/2011 de Groot et al.……………356/4952006/0227316 A₁10/2006 Gatt………………………356/5.092007/0002327 A11/2007 Zhou et al.…………………356/4562007/0024856 A₁2/2007 Izatt et al.………………356/4562008/0170225 A₁7/2008 de Boer et al.……………356/3272008/0304044 A1者12/2008 Cooper et al.……  …356/5.152009/0316160 A₁*12/2009 Izatt et al.………………356/456  \n*  \n*  \n号  \n承  \n号  \n2010/0090887 A14/2010 Cooper et al.…………342/25F2010/0094576 Al*4/2010 De Boer et al.……  …702/662011/0037965 A₁'*2/2011 Hintz et al.……………356/4.012011/0134249 A16/2011 Wood et al.………………348/1642011/0210237 A1*9/2011 Sternklar ………………250/214.1  \nFOREIGN PATENT DOCUMENTS  \n62250384 A*10/1987  \nJP  \nJP  \n63058185 A*3/1988  \n*cited by examiner  \nSheet 1 of 9  \nMar.27,2012  \nU.S.Patent  \nFIG.1A  \nUS 8,144,052 B2  \nSheet 2 of 9  \nMar.27,2012  \nU.S.Patent  \nFIG.1B  \nUS 8,144,052 B2  \nSheet 3of 9  \nMar.27,2012  \nU.S.Patent  \nFIG.1C  \nUS 8,144,052 B2  \nSheet 4 of 9  \nMar.27,2012  \nU.S.Patent  \nFIG.2  \nUS 8,144,052 B2  \n300  \nFIG.3  \nU.S.Patent  \nMar.27,2012  \nSheet 6of 9  \nUS 8,144,052 B2  \nFIG.4  ","cbCaitQPM8iwOKJW","https://ap.wps.com/l/cbCaitQPM8iwOKJW","pdf",1446399,1,20,"English","en",105,"# Abstract\n## FMCW high-frequency radar\n## Multiplexed transmit/receive beam processing","[{\"question\":\"What waveform does the high-resolution 3D imaging radar use?\",\"answer\":\"It uses a frequency-modulated continuous-wave (FMCW) waveform generated with low phase-noise synthesizers and a fast chirper.\"},{\"question\":\"How does the radar obtain range information for multiple pixels at once?\",\"answer\":\"It uses a multiplexed beam so that reflected returns are received as a single beam, then demultiplexed and processed to reveal separate pixel ranges.\"},{\"question\":\"How are multiple transmit beams distinguished before reaching the target?\",\"answer\":\"Temporal and spatial differentiation via optics separates the pixel range information into different intermediate frequencies; differentiated polarizations can also be used for collinear beams.\"}]","MULTI-PIXEL HIGH-RESOLUTION THREE-DIMENSIONAL IMAGING RADAR - High-frequency FMCW with multiplexed beam | 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waveform does the high-resolution 3D imaging radar use?","Question",{"text":76,"@type":77},"It uses a frequency-modulated continuous-wave (FMCW) waveform generated with low phase-noise synthesizers and a fast chirper.","Answer",{"name":79,"@type":74,"acceptedAnswer":80},"How does the radar obtain range information for multiple pixels at once?",{"text":81,"@type":77},"It uses a multiplexed beam so that reflected returns are received as a single beam, then demultiplexed and processed to reveal separate pixel ranges.",{"name":83,"@type":74,"acceptedAnswer":84},"How are multiple transmit beams distinguished before reaching the target?",{"text":85,"@type":77},"Temporal and spatial differentiation via optics separates the pixel range information into different intermediate frequencies; differentiated polarizations can also be used for collinear 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