65 Electromagnetic Vector-Sensor Array Processing

... Electromagnetic Vector-Sensor Array Processing Digital Signal Processing Handbook Ed. Vijay K. Madisetti and Douglas B. Williams Boca Raton: CRC Press LLC, 1999 c  1999byCRCPressLLC 65 Electromagnetic ... (t) (65. 3) Similarly,fromEq. (65. 2a),afterappropriatescaling,themagneticpartofthemeasurementwillbe takenas y H (t)=u×E(t)+e H (t) (65. 4) InadditiontoEq. (65. 3)and (65. 4),wehavetheconstraint (65. 2b). ... 1999byCRCPressLLC 65 Electromagnetic Vector-Sensor Array Processing 1 Arye Nehorai The University of Illinois at Chicago Eytan Paldi Haifa, Israel 65. 1 Introduction 65. 2 The Measurement Model Single-Source...

... Array Processing for Mobile Communications.”2000 CRC Press LLC. <http://www.engnetbase.com>.FIGURE 68.4: Space-time structures.68.3 Algorithms for STPThe history of array signal processing ... across the array. For example, in GSM the inverse signal bandwidth is 5 µs, whereasthe travel time across the array is, at most, a few ns. This is the narrowband assumption in array processing. ... m-dimensional vector,called the array response vector defined asa(θl) =[a1(θl)a2(θl) am(θl)]Twhere (·)Tdenotes matrix transpose.In array processing literature the array vector a(θ) is...

... LLCInverseProblemsinArray Processing KevinR.FarrellT-Netix/SpeakEZ30.1Introduction30.2BackgroundTheoryWavePropagation•SpatialSampling•SpatialFrequency30.3NarrowbandArraysLook-DirectionConstraint•PilotSignalConstraint30.4BroadbandArrays30.5InverseFormulationsforArrayProcessingNarrowbandArrays•BroadbandArrays•Row-ActionProjec-tionMethod30.6SimulationResultsNarrowbandResults•BroadbandResults30.7SummaryReferences30.1 ... opportunities via array processing algorithms. Array processing algorithms are typically realized through the imple-mentation of narrowband or broadband arrays. These two arrays are discussed ... IntroductionSignalreceptionhasnumerousapplicationsincommunications,radar,sonar,andgeoscienceamongothers.However,theadverseeffectsofnoiseintheseapplicationslimittheirutility.Hence,thequestfornewandimprovednoiseremovaltechniquesisanongoingresearchtopicofgreatimportanceinavastnumberofapplicationsofsignalreception.Whencertaincharacteristicsofnoiseareknown,theireffectscanbecompensated.Forexample,ifthenoiseisknowntohavecertainspectralcharacteristics,thenafiniteimpulseresponse(FIR)orinfiniteimpulseresponse(IIR)filtercanbedesignedtosuppressthenoisefrequencies.Similarly,ifthestatisticsofthenoiseareknown,thenaWeinerfiltercanbeusedtoalleviateitseffects.Finally,ifthenoiseisspatiallyseparatedfromthedesiredsignal,thenmultisensorarrayscanbeusedfornoisesuppression.Thislastcaseisdiscussedinthisarticle.Amultisensorarrayconsistsofasetoftransducers,i.e.,antennas,microphones,hydrophones,seismometers,geophones,etc.thatarearrangedinapatternwhichcantakeadvantageofthespatiallocationofsignals.Atwo-elementtelevisionantennaprovidesagoodexample.Toimprovesignalreceptionand/ormitigatetheeffectsofanoisesource,theantennapatternismanuallyadjustedtosteeralowgaincomponentoftheantennapatterntowardsthenoisesource.Multisensorarraystypicallyachievethisadjustmentthroughtheuseofanarrayprocessingalgorithm.Mostapplica-tionsofmultisensorarraysinvolveafixedpatternoftransducers,suchasalineararray.Antennapatternadjustmentsaremadebyapplyingweightstotheoutputsofeachtransducer.Ifthenoisearrivesfromaspecificnon-changingspatiallocation,thentheweightswillbefixed.Otherwise,c1999byCRCPressLLCif...

... lưu trữ rộng rãi trên Internet. Trong bài viết này tôi đã tìm hiểu về công nghệ Raid(Redundant Array of Independent Disks) - Mảng Dự Phòng Tạo Nên Từ Các Đĩa Độc Lập. Chức năng của công nghệ ... trang 6 A. TÌM HIỂU CÔNG NGHỆ RAID I. RAID LÀ GÌ? - RAID là chữ viết tắt của Redundant Array of Independent Disks. Ban đầu, RAID được sử dụng như một giải pháp phòng hộ vì nó cho phép...