多传感器组网及反隐身、抗干扰接力跟踪技术研究
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摘要
反隐身、抗干扰的高机动目标定位与跟踪方法是一个具有挑战性的课题。单传感器在来袭目标隐身或伴随支援干扰情况下获取的量测信息缺损时,无法进行定位跟踪。多传感器目标跟踪是信息融合技术在目标跟踪领域的应用范例,它将多个传感器信息有机合成,估计目标的运动状态,产生比单一传感器更优越的跟踪性能。因此,研究如何充分利用多传感器的互补信息和冗余信息,实现对感兴趣目标持续、精确的定位于跟踪,具有重要的理论意义和实际的应用价值。本课题基于与航天集团某部的合作项目,以单地基雷达组网探测跟踪空中机动目标(导弹、飞机等)为背景,主要研究了雷达网布站优化、机动目标融合定位跟踪以及量测盲区航迹拟合与跟踪等问题。课题的主要内容如下:
     首先,提出了适用于警戒系统的一种雷达优化布站方法,以求在给定的地理环境和应用背景下获得满意的警戒空域、重点探测空域和具备一定的抗干扰、反隐身能力。在分析组网系统探测性能的空间分布和作战原则的基础上,根据所要探测目标的雷达散射面积特性和各雷达的空间探测特性,建立了雷达优化布站的数学模型,并采用遗传算法解决复杂寻优问题。仿真结果验证了该模型进行优化布站的有效性。RCS
     其次,基于上述雷达布站探测背景,研究了多传感器融合定位跟踪方法,针对干扰背景下各雷达获取量测信息残缺(方位或距离信息丢失)情况下的定位问题,提出了以纯角度、纯距离、全信息等可定位量测子集优组合优化定位的方法来提高定位精度和扩展可定位空域。同时建立了基于当前统计模型的先定位后KF跟踪模型与直接EKF集中式融合跟踪模型。通过仿真试验比较了两种模型在提高跟踪精度和建立连续航迹的有效性。
     最后,针对现有算法跟踪高机动目标存在的问题,提出了一种基于分段航迹识别的新的机动目标跟踪方法,并将该算法用于三维环境下的盲区机动目标航迹拟合与跟踪,该算法具有一定的创新性。仿真结果表明,与现有的机动目标算法相比,在高机动目标跟踪环境下,本文提出的算法拥有较大的优势。
Highly maneuverable target locating and tracking under anti-stealth and anti-interference environment is a challenging subject. Part of measurements of single sensor will be lost in traditional interference or target stealth technology. Multi-sensor target tracking is a paradigm of information fusion technique dealing with target tracking problem. It estimates target state through intelligent integration of multi-sensor data to gain better tracking performance than single sensor does. So it is significant in theory and practical in application to research on how to make use of the redundant and complement information of multi-sensor for object locating and tracking continually, accurately.
     In this thesis, the methods of single station radar netting optimize embattle techniques, multi-sensor target locating and tracking fusion, track fitting and tracing on blind area are mainly researched with the background of one project that cooperates with certain department of China Aerospace Science & Industry Company.
     Main contents and results are as follow:
     First, an approach to radar netting to solve the problem of how optimally to locate the different radars is proposed to achieve a satisfactory surveillance area and some highly-concerned areas inside as well as the ability of anti-stealth and anti interference in some degree. Based on the RCS of the interested targets and the coverage diagrams of the radars, the performance distribution in the surveillance area is analyzed, and a mathematical model for radar netting optimization along with some strategies in the netting algorithm is presented. The approach also takes several factors into account, such as local terrain around radar, man-made interference, stealth target, flying direction of target, track information known previously and so on. Genetic algorithm is introduced to solve the complexity of finding the best result. Simulation experiment illustrates the validity of the approach.
     Second, multi-station fusion locating and tracking algorithms under the simulate background provide by first part are researched. in order to get high location precision in most of areas, assembled optimum location algorithm is presented by combining full information location, bearing only location and range only location algorithms, and least square optimization is used for each algorithm to improve precision. based on EKF algorithms, and central fusion structure is selected for tracing. It can solve observability and nonlinear problems when tracing by bearing-only measures. Another algorithms locating first then taking the location data as measure of the KF input is presented. The EKF and KF is based on Current Statistical Model. The simulation experiment is conducted for the case which consists of twenty stations. The result shows that the EKF tracking performances are satisfied comparing with the KF.
     Finally, a creative method based on above research is presented for highly maneuvering target tracking and applying under three dimension and blind area circumstance, which is based on segmenting track identifier. Simulation results show that under the circumstance of tracking highly maneuvering targets, comparing with the existence methods this algorithm has a better performance.
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