Assessment Method Study Of Low Contrast Target Acquisition Ability For Photoelectric Tracker

Low contrast target acquisition ability is one of the important factors relating tooverall performance of photoelectric tracker. Domestic assessment of low contrasttarget acquisition ability is usually carried out from field experiments; however, fieldtest not only always has poor capability of quantitatively assessment, but also oftenneeds so much manpower and material resources that field test is not suitable forbatch test.Because of its imperfect theory of low contrast target acquisition forphotoelectric tracker, capture theory is studied in this dissertation. The dynamic grayformula and the dynamic contrast ratio formula is summarized and tested. Perfecttheory of low contrast target acquisition for photoelectric tracker helps assessmentlow contrast target acquisition ability for photoelectric trackerAiming to the lack of indoor test methods relating to low contrast targetacquisition ability for photoelectric tracker and the imperfect theory about lowcontrast target acquisition, a new indoor method for performance assessment of lowcontrast target acquisition ability for photoelectric tracker is proposed in thisdissertation. Infinity target source of adjustable contrast and turntable of adjustablespeed are considered as detection device. Optical reference target whose contrast canbe accurately measured is provided for detecting opto-electronic tracker working indynamic environment where the rotation rate can be precisely set, in order to validate acquisition ability of opto-electronic tracker for low contrast dynamic object based ontarget extraction. The opto-electronic tracker can also be evaluated in terms ofacquisition performance or acquisition speed in different target contrast and differentmovement speed by the analysis of the target’s movement speed, target size that affecttarget contrast.Assessment device is proved well in this dissertation, and experiment for proveimage and radiance of target and background in adjustable contrast target source isperformed. In order to make contrast targets meet the needs of low contrast targetscapture photoelectric tracker, the accuracy of assessment device’s target andbackground is verified, the possibility of mutual interference between differentequipment which affect the evaluation results is ruled out.Contrast calibration formula use radiance as parameters in this dissertation. Therelationship between contrast calibration formula and tradition contrast formula isDemonstrated and tested.The basic theory of low contrast targets capture is applied to assessment of lowcontrast static and dynamic target acquisition capability for a certain photoelectrictracker by assessment device. Assessment result shows that assessment method andassessment device presented in this dissertation can assess the low contrast statictarget acquisition ability for photoelectric tracker; and it has the capability to assessthe low contrast dynamic target acquisition ability for photoelectric tracker with lowspeed, low contrast demand.