Research On Infrared Passive Location Technology From Monostation

Along with the rapid progress of the modern military technology, the electro-optical countermeasure techniques have gained its rapid development and wide application in modern warfare, among them the advanced electro-optical countermeases equipments are needed for fitting all high-value mobility platform without exception, such as the Strategy Bomber, Early Warning Aircraft, Intercontinental Ballistic Missile, War Ship and Ground Core Command System. For giving full play to the efficiency of electro-optical countermeasure equipments, that accurate location to a intruding target is needed, it is also an important technology which urgently to be solved in modern military high science and technology. The passive location system on monostation has earned its bright application prospect in modern warfare, for its merit of small size, good self-concealing and high mobility.Location includes both direction and ranging, the direction technology is becoming perfect because it has been widely studied in guide and tracking, but the ranging technology, especially ranging on monostation based on electro-optical techniques is yet the key technology, it is also an important technology which urgently to be solved in modern military high science and technology. Combined with the tenth-five-year Weapon Equipment Front Research Item that the passive infrared location Technology on monostation, this dissertation deals with the particular problems and the key technology in passive infrared mono-station location to mobile targets from aerial high-value mobile platform.On the basis of investigating in both abroad and domestic trend of passive location research in the past years, it performs a deeper research into the passive ranging based both on principle of intersection of lines-of-sight, and on the infrared imaging bounds to a moving spatial target.On the research of passive ranging based on intersection of lines-of-sight, a closed error analysis formula is obtained for stillness targets ranging from a mobile observation station, the location schemes based on either angle measuring or synchronous timing was evolved or consummated. The emphasis was put on a quasi-monocular passive location strategy with a short baseline. This strategy is valid for both stillness and movement target, but the corresponding system is not suitable for an airbone platform because of its large space requirement.In the study of passive ranging target based on infrared optics imaging, to counter the geometrical optics bound, passive ranging that based on focusing, on defocusing, on Optical Transfer Function, and on Modulation Transfer Function were analyzed individually, all of these were described in the Point Spread Function frame. To counter spatial relationship and projective bound, the passive ranging schemes based on affin transfer were discussed, which involves the facet movement analysis, the contour expand based ranging, ranging with an external base line. To counter the infrared signal propagation characteristic, the passive ranging based on radiant intension observed successively was investigated. It focused on how to equip ranging function for an Infrared Searching and Tracking System, a global passive ranging scheme has achieved combined the United States navy model with the directional information. This scheme is feasible for a system work under sensitivity-limited, and correct parameters setting is needed.With the defects or limitations of each scheme available having been countered, a passive Infrared monostation ranging scheme based on image sequence measurement was turned out, and then combined with the practical problem in engineering realization, an executive scheme was studied based on the targets'characteristic linearity combined with the directional information. The location principle was proved, and the relative location algorithm equations were turned out. To counter the exclusive, steady and existent property of the location algorithm, a research on the solution to the location equations was performed; the ranging algorithm was demonstrated exclusive and steady. It also was affirmed further by simulation that the location algorithm would not lose its stability in practice using.Aiming at engineering realization for the this algorithm, relative research has performed, which include:(1) the performance analysis, and it was made clear that the characteristic linearity measurement error is the main factor for location precision, then the characteristic linearity measurement limitation for location within certain precession has given. (2) For letting this algorithm effectively fit the variation of the target's posture and movement state, the characteristic linearity choice was studied, and the relationship between characteristic linearity and the location equations has been discussed and optimized. (3) The study of the adaptability of image sequence procession algorithm to the target's surroundings, as the target images filtration and enhancement under such complicated surroundings such as clouds and rain, the characteristic linearity was found through the target's edge detection and trace matching, subsequently a characteristic linearity in subpixel has obtained. (4) A quasi-reality reduce scale model simulation system was designed and build up, with which lots of experiments research was carried out, those involve location performance via mobile target's posture, via target's movement state, and via measurement station's movement state, the relative location algorithm has tested and consummated.It is illustrated by both computer simulating and lots of experiments under the quasi-reality reduce scale model simulation system, that a relative ranging error less than 5% can be achieved within image measuring precision and goniometer measuring precision in our exiting system. The results meet specification requirement, the correctness and the validity of the algorithm has been tested and verified again.At last, an overview of the paper was given together with the author's personal view on the deeper research and application for infrared passive location techniques on monostation for the future.