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Research On Key Techniques Of Passive Monostation Location System Based On IRST

Posted on:2009-08-21Degree:DoctorType:Dissertation
Country:ChinaCandidate:E K LiFull Text:PDF
GTID:1118360302969127Subject:Physical Electronics
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The subject of the dissertation "Research on Key Techniques of Passive Monostation Location Based on IRST "is derived from pre-investigation projects in the Tenth and the Eleventh Five-Year Plan.The electro-optical countermeasure techniques have gained great progress and extensive applications in modern warfare with the rapid development of the modern military high technologies. The advanced electro-optical countermeasure equipment must be equipped by all high-value mobile platforms, such as the Strategy Bomber, Early Warning Aircraft, Intercontinental Ballistic Missile, Warship and Ground Core Command System and so on. Infrared Search and Track(shortened form IRST) is one kind of passive military infrared integrated electronic warfare system with wide view field, which of the task is to reliably detect, accurately locate and continuously track objects and targets that radiates infrared under background radiation and other interferences. IRST has unique advantage such as good concealment characteristic, because of its being passive detection, and becomes the one of target detection and track systems being developed for future use in military field. It is needed to accurately locate the intruding targets including the angles and range to effectively play the role of electro-optical countermeasure equipments. At present a lot of IRST systems do not have range acquisition function, and they must rely on a laser range finder or radar to determine range, which would destroy the concealment characteristic of the system. It is an important technology problem how an IRST system to locate passively the object, which should be urgently solved in modern military hi-tech.This dissertation studies the key techniques of infrared passive monostation location system based on IRST combining IRST technology with infrared passive location system on monostation.On the basis of reviewing the research on IRST and infrared passive location techniques on monostation, this dissertation has discussed the basic theories on infrared passive monostation location techniques based on IRST, investigated several key techniques on information processing in the passive monostation location(ranging) system based on IRST, analyzed several typical algorithms on infrared passive monostation ranging systems based on IRST, designed the scheme on infrared passive monostation location(ranging) system based on infrared imaging, sequence images processing, and three dimension motion analysis. The scheme's quasi-reality model simulation system with reduced scale has been realized, the errors of the system been analyzed, the key measures to decrease the errors been presented, and the prospect use of the system been expected.The main conclusions in this dissertation are as follows:1.The technical performance requirements to infrared passive monostation location(ranging) systems based on IRST have been presented from the view of actual combat. The progress and status of IRST systems, infrared passive monostation location systems, and infrared passive monostation location systems based on IRST have been summarized. The basic theories on infrared passive monostation location(ranging) techniques based on IRST have been discussed, which include infrared imaging and target radiation characteristic, atmosphere transmission of infrared radiation, infrared image preprocessing, infrared targets detection, infrared imaging and tracking, infrared system action distance and so on..2. This dissertation has concerned mainly on the information processing technologies in the passive monostation location(ranging) system based on IRST. It studies the IRFPA nonuniformity correction algorithms. It presents the IRFPA nonuniformity correction algorithm based on function fitting. The algorithm has broader dynamic range and can realize double correction to non-linearity and nonuniformity of response characteristic of IRFPA with small amount of on-line count, fast speed and high correction precision, and is propitious to engineering applications. It studies preprocessing algorithms on sequence images, and describes conventional image denoise and enhancement algorithms. It proposes an image filtering algorithm without edge damage. The algorithm can not only denoise practical noises, but also can hold image details. It investigates segmentation algorithms on sequence images and discusses conventional image segmentation algorithms based on boundary and on area respectively. It presents an effective adaptive threshold segmentation algorithm for infrared image and background based on the function rule on maximum square difference between sorts, The algorithm satisfies requests to location in real time and applicability of targets to circumstances. It expatiates several parameters of image characteristic description and gives the processes of image characteristic measurement and pick-up.3. This dissertation has thoroughly analyzed several typical ranging algorithms on passive monostation location systems based on IRST. It includes the model of dynamically measuring range and velocity by IRSTS, the adaptive ranging algorithm model based on expanded Karman filter, the model of single observer ranging based on double bands of IRSTS, the target ranging model based on irradiancy contrast, the three dimension (3D) kinematics ranging algorithm model. All the algorithms are described from the establishment of ranging models, the derivation of ranging expressions, the simulation experiments and their results. It concerns mainly on the passive monostation location scheme based on infrared imaging, sequence images processing and 3D motion analysis. In terms of the practical situation in passive location of air mobile platforms with high value (such as aeroplane, missile etc.) to air mobile targets, it establishes the physical model and space geometry coordinates model on passive location of mobile platforms to mobile targets, gives the spatial coordinates transform expression on the motion compensation of mobile platforms, derives the location algorithm mathematical model of adaptable to the gesture and motion state change of mobile targets. The quasi-reality reduce scale model simulation system has been designed and realized. Computer simulation and quasi-reality reduced scale model simulation system experiment have validated the correctness and validity of the system scheme. It analyzes the IRST system errors and passive monostation location(ranging) system errors based on IRST and presents several measures to decrease the systems'errors.4. This dissertation gives a brief introduction to the applications of passive monostation location(ranging) system based on IRST to currently developed integrated weapon system-Distributed Aperture Infrared Sensor System-DAIRS.DAIRS employs multiple fixed identical sensors to obtain the functionality that was previously obtained using specialized sensors for each function. In its role in tactical aircraft, DAIRS uses an array of six strategically located sensors which provide 4p steradian sensor coverage, i.e., full sphere situational awareness (SA) to the aircrew. That awareness provides: missile threat warning, Infrared Search and Track (IRST), battle damage assessment, targeting assistance, and pilotage. Its possible future trends will be super-resolution capacity, high frame, and multiple spectrum.
Keywords/Search Tags:Infrared Search and Track(IRST), Monostation Location, Ranging Algorithms, Infrared Focal Plane Array(IRFPA), Nonuniformity Correction, Image Denoise, Image Segmentation, Distributed Aperture Infrared Sensor System(DAIRS)
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