末敏弹简易红外成像起爆控制系统研究
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摘要
在现代地面战争中,为了使常规火炮能在远距离用一至两发弹就能命中并毁伤装甲车辆,就要求炮弹能自动探测、搜索装甲目标。因此,近年来敏感起爆类型的引信—SADARM(sense and destroy Armour)获得了巨大的发展。
     本文以“十五”重点预研项目“末敏弹简易红外成像起爆控制技术”为背景,针对其中的主要内容进行研究,研制出了满足152mm末敏弹结构要求的简易红外成像试验样机,样机采用多元长波与单元中波相复合的红外探测体制,此样机能够达到在复杂背景中对地面目标(冷目标)探测距离≥150m,定位精度≤0.5m,识别率≥80%。无论从性能、体积上,作为应用于152mm或155mm末敏弹的原理样机的关键技术已经突破。通过本项目的研制,解决了我国在研制末敏弹时红外敏感器的性能一直达不到要求的问题,它的研究成果可直接应用于新一代末敏子弹武器系统中,使我国在末敏弹自行研制的实用化方面更进一步。具体研究内容如下:
     (1) 根据系统应用背景,首先用红外测温仪和热像仪等仪器,从高空对目标的顶甲及背景进行了测试,其次从理论上对目标和背景的红外辐射特性进行了分析,从而为系统的设计提供了理论依据和实验数据。
     (2) 对简易红外成像起爆控制系统进行了总体分析,并对各部件进行了设计,使之满足152mm末敏弹的体积要求和性能要求。研制了适于弹上应用的新型杜瓦结构双色多元红外探测器,通过使用特殊的材料把光学系统的遮光罩与探测器的冷屏巧妙地结合在一起,解决了探测器窗口结霜及光学系统杂散光的问题。针对探测系统的视线方向在旋转方向稍微向前偏置一定角度的要求,以完成目标的实时识别与炸点控制,本系统采用探测器灵敏面偏离光学系统中心一定距离的设计方法,简化了系统的结构,提高了系统的强度。对微型高压气瓶、光学系统、探测器及致冷器进行了一体化设计,实现了红外敏感器的小型化和实用化。
     (3) 本文对最佳起爆点的控制进行了理论研究,确定了弹轴与光轴之间的夹角,提出了在近距离时采用二次扫描,在远距离时采用一次扫描的方法,从而提高了系统的毁伤效果。基于低分辨率的红外目标特征描述和提取、目标分类和识别等方面的研究是末敏子弹红外目标识别一个重要研究方向。它对目标识别的实时性要求非常苛刻。我们选用了片内具有丰富外设资源的高速DSP芯片TMS320F240作为本系统的图像微处理器,研制了基于TMS320F240DSP的红外目标实时识别系统,目标的实时处理识别时间小于0.1ms。给出了本系统的红外目标实时识别算法。
     (4) 试验方法研究。构建了一套模拟弹目交会条件下的扫描平台。这样只需
In modern ground wars, in order to accurately damage an armored target with one or two conventional ammunitions from long range, the ammunitions must have the ability of automatic detection and identify an armored target. So Smart ammunitions have been developed in recent years.
    In this thesis, the main contents of "the technology of simple infrared imaging detonation control applied to Smart ammunitions" which is the 10~(th) 5-year national defense preparatory study, are studied as follows:
    1) According to the system application, we measured the infrared radiation characteristic of target and background from air and analyzed it. All that provided scientific basis for our designing the system.
    2) The master analysis of the infrared imaging fuse system was given, and all the parts of the system were designed, So that its performance and volume meet the demand of 152mm SADARM. A new type infrared detector (without Dewar) applied to cannonball was developed. The problems of being frosted on the detector window and stray light were solved by the coalescent of the optical lens hood and the detector shield. The unique method of the detector sensitive side departure off optical axis was adopted So that target real time recognition and the burst point control can be accomplished in time. The system liability and intension were improved by the integrative design of subminiature high-pressure bottle, the optical system, detector and cooler.
    3) The research of low-Resolution IR target feature extracting and target recognition is an important task for the Smart ammunitions. It needs real-time target recognition. In this system, the high-speed DSP —TMS320F240, as a microprocessor, is used. The theory research of optimal burst point control was studied. The angle between optical axis and bomb axis was confirmed.2-time scan in short range and 1-time scan in long range are presented, so that damage effect will be improved. A real-time Infrared target recognition algorithm is given in this paper. A real-time Infrared target recognition system was manufactured, which has been applied in the test prototype of Smart Ammunition. The experiment result shows that the system is of high reliability and capability of anti-jamming.
    4) A new kind of data acquisition and playback system based on PC/104 bus is designed and brought on the demand of high performance, large capacity and
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