پديد آورنده :
جواهري، نورالدين
عنوان :
آشكارسازي پالس هاي ليزري و برآورد زمان وقوع رخداد در فاصله ياب هاي ليزري
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مخابرات﴿سيستم﴾
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
نه،107ص.: مصور
استاد راهنما :
عليمحمد دوست حسيني، محمدرضا احمدزاده
استاد مشاور :
محمود مدرس هاشمي
توصيفگر ها :
زمان پرواز , آشكارساز نوري خطي , آشكارساز GLR , تخمين پارامتري
تاريخ نمايه سازي :
1394/07/29
تاريخ ورود اطلاعات :
1396/10/05
رشته تحصيلي :
برق و كامپيوتر
دانشكده :
مهندسي برق و كامپيوتر
چكيده انگليسي :
Laser pulse detection and event time estimation in laser rangefinders Norodin Javaheri n javaheri@ec iut ac ir Date of Submission Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor A M Doosthosseini Assoc Prof alimdh@cc iut ac ir M R Ahmadzadeh Assist Prof ahmadzade@cc iut ac irAbstractThe main issue in pulsed non coherent laser rangefinder based on linear photodetectors isthe time of arrival delay estimation of received optical pulses Estimation accuracy hasbeen a significant research concept from the early days using these detectors Threedominating factors are timer jitter and walk errors Previous works on this issue withseparate approachs try to reduce each error independent from the others and are mainlyfocused on averaging and integrated circuit design In this thesis using parametricestimation methods we attempt to estimate time of arrival of the received optical pulsesand reduce these three errors simultaneously through pulse repetition technique In thisapproach assuming triangular and exponential waveforms for receiver output we estimatetime of arrival of the incident optical pulses on a linear photodetector surface and obtainCramer Rao lower bound for the error Another important issue in pulsed direct laserrangefinder is the detection of echo pulses from target The output signal of photodetectorsis random Existing works are often based on photon counting photodetectors While in thelinear structure matched filter and pulse integration are used assuming deterministic outputsignals In this thesis we derive the relation between signal and noise as well as pdfs for alinear PIN photodiode Then we obtain optimal statistical detector under Neyman Pearsoncriteria Due to the unknown parameters in the probability density functions Neyman Pearson detector cannot be used effectively Therefore we had to use a GLR detector andcompare its performance with that of Neyman Pearson Keywords 1 Laser rangefinder 2 time of flight 3 linear photodetector 4 GLR detector 5 parametric estimation
استاد راهنما :
عليمحمد دوست حسيني، محمدرضا احمدزاده
استاد مشاور :
محمود مدرس هاشمي
