共查询到18条相似文献,搜索用时 243 毫秒
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针对雷达网有源假目标干扰问题,为了消除长基线雷达组网时地球曲率对数据处理的影响,通过坐标转换,将各雷达站的目标的量测数据转化到了地心直角(ECEF)坐标系内,得到统一坐标系下的目标量测信息,完成空间上的对准;在此基础上,基于虚假目标的量测与雷达站位置有关,真实目标量测与雷达站无关,因而依据卡方分布的性质,在ECEF坐标系内对各个量测进行卡方检验,鉴别出虚假目标;最后,通过仿真验证了分析的正确性,该算法与工程实际接轨,实用性较强。 相似文献
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为了更好地解决高精度雷达标定的问题,提出了基于广播式自动相关监视系统(ADS-B)固定误差及目标回波中心动态修正的雷达标定新方法。首先分析了ADS-B位置数据误差的来源、类型及在雷达坐标系下的特征,同时对民航目标回波中心的变化作了分析建模,在此基础上进一步通过对雷达数据与ADS-B数据之差作动态联合修正,最终估算出雷达系统误差,提高了雷达系统误差标定的精度和稳定性。并利用多批次的实测数据对该标定新方法与其他方法进行了对比验证,结果表明,该方法有效提高了标定的精度和稳定性,并已成功应用于雷达标定设备中。 相似文献
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基于ECEF的广义最小二乘误差配准技术 总被引:10,自引:1,他引:10
雷达组网数据处理首先要进行误差配准,来准确地估计和消除系统误差。传统的误差配准技术多基于球极投影,当雷达之间距离较远时,给配准结果引入一定的误差。基于地球中心坐标系(ECEF),提出了一种广义最小二乘的ECEF-GLS误差配准技术,较好地解决了远距离误差配准问题,误差分析表明,如果忽略模型线性化引入的误差,配准结果达到了CRLB下限。最后,使用仿真数据验证了算法的性能,并和Zhou提出的基于ECEF坐标系的最小二乘ECEF-LS误差配准算法进行了比较。 相似文献
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研究了存在系统误差时修正极坐标系(MPC)下的雷达与电子支援措施(ESM)航迹关联问题。系统误差导致MPC下雷达和ESM的角度估计产生偏移,而对角度变化率、距变率与距离的比值(ITG)的估计影响不大;结合非中心卡方分布的知识,分析了雷达与ESM的测量误差对非中心参数和正确关联概率的影响;提出了一种基于积分重合度的雷达与ESM航迹对准关联算法。首先将雷达与ESM的目标映射到角度-角度变化率空间,分别得到了雷达与ESM的目标曲线,然后对两目标曲线求积分重合度,估计出雷达与ESM测角系统误差的偏移量,对偏移量补偿后进行雷达与ESM的航迹关联。仿真结果表明,本文所提算法能有效地提高存在系统误差时雷达与ESM正确航迹关联概率。 相似文献
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多监视数据融合时间对准问题分析 总被引:2,自引:0,他引:2
宫峰勋 《中国民航学院学报》2003,21(6):10-13
在总结了时间片技术和同采样起点2种常用时间对准技术的基础上,提出了一种基于民航监视特点的时间归一化外推数据对准算法,可以在保证实时性的前提下完成一、二次雷达数据、ADS、VHF系统的数据融合处理。 相似文献
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基于孔径分解和图像递归融合的快速分解后向投影(FFBP)算法具备接近频域算法的运算复杂度和媲美后向投影(BP)算法的聚焦性能。但与频域成像算法不同,使用FFBP算法重建的直角坐标系图像或极坐标系图像均无法满足传统自聚焦方法的使用条件。为了解决这个问题,首先,提出了虚拟极坐标系作为FFBP算法的图像重建平面,为自聚焦方法的使用奠定了基础;其次,以基于回波数据的运动补偿为目标,充分利用FFBP算法多孔径递归融合的特点,将多孔径图像偏移(MAM)的相位估计方法嵌套到FFBP算法的各个阶段,从而实现MAM与FFBP算法的紧密相容;最后,通过实测数据处理验证了该方法的可行性和有效性。 相似文献
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Yifeng Zhou Leung H. Blanchette M. 《IEEE transactions on aerospace and electronic systems》1999,35(2):410-418
In this work, we formulate the multiple sensor alignment problem in an Earth-centered Earth-fixed (ECEF) coordinate system. The alignment algorithm maps the sensor measurements to the ECEF coordinates using a geodetic transformation, and attributes the discrepancies in the Earth-referenced system reported by each sensor to the sensor biases. Sensor biases are then estimated using the least squares (LS) technique. Simulated and real-life radar data are used to evaluate the performance of the proposed algorithm. Comparisons are made to those algorithms based on the standard stereographic projection 相似文献
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Li W. Leung H. Yifeng Zhou 《IEEE transactions on aerospace and electronic systems》2004,40(3):824-836
Space and time alignments are the prerequisites for the successful fusion of multiple sensors. A space-time registration model is proposed to estimate the system biases and to perform time synchronization together for mobile radar and electronic support measure (ESM) systems. A space-time registration model for radar and ESM is first developed, and an unscented Kalman filter (UKF) is proposed to estimate the space-time biases and target states simultaneously. The posterior Cramer-Rao bounds (PCRBs) are derived for the proposed UKF registration algorithm for ESM detection probability less than or equal to one. Theoretical analyses are performed to evaluate the accuracy and robustness of the proposed method. Computer simulations show that the UKF registration algorithm is indeed effective and robust for different radar and ESM tracking scenarios. 相似文献
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非合作目标动态RCS仿真方法 总被引:1,自引:0,他引:1
针对非合作目标难以开展动态测量的问题,根据空气动力学原理提出了一种非合作目标动态雷达散射截面(RCS)仿真方法。该方法首先建立测量背景下典型飞行航路模型,然后计算雷达视线在机体坐标系上的时变姿态角。根据姿态角开展电磁计算,获得F-117A隐身攻击机在侧站平飞、背站拉起、对站俯冲、侧站盘旋4种航路下的动态RCS数据。着重分析了动、静态RCS特性在起伏目标检测性能评估上的差异。结果表明:静态RCS特性难以反映目标运动时真实的雷达特性,利用静态数据描述目标特性可能导致错误结论,而文中方法获取的动态RCS数据可以提高结论的完整性和可信度。 相似文献
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A multipath data association tracker for over-the-horizon radar 总被引:3,自引:0,他引:3
A new algorithm, multipath probabilistic data association (MPDA), for initiation and tracking in over-the-horizon radar (OTHR) is described. MPDA is capable of exploiting multipath target signatures arising from discrete propagation modes that are resolvable by the radar. Nonlinear measurement models exhibiting multipath target signatures in azimuth, slant range, and Doppler are used. Tracking is performed in ground coordinates and therefore depends on the provision of estimates of virtual ionospheric heights to achieve coordinate registration. Although the propagation mode characteristics are assumed to be known, their correspondence with the detections is not required to be known. A target existence model is included for automatic track maintenance. Numerical simulations for four resolvable propagation modes are presented that demonstrate the ability of the technique to initiate and maintain track at probabilities of detection of 0.4 per mode in clutter densities for which conventional probabilistic data association (PDA) has a high probability of track loss, and suffers from track bias. A nearest neighbor version of MPDA is also presented 相似文献
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针对目前飞机组部件自动制孔离线编程人工参与程度高、效率低,质量问题无法预防的现状,提出了基于数据库及标签定义的准确离线编程技术。根据飞机自动制孔的工艺特点,制定了离线编程流程。根据离线编程数据需求,建立了编程数据库。结合数据库以及MBD模型,制定了自动制孔标准件、叠层、厚度、工艺参数等信息提取规则,利用DELMIA中标签具备属性特征、方向特征、点位特征的特点,实现了基于标签的工艺信息表达及设备姿态控制。最后对标签在产品坐标系和设备坐标系的转换进行了分析,实现了加工程序坐标值的正确输出。 相似文献
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OTHR multipath tracking with uncertain coordinate registration 总被引:1,自引:0,他引:1
Multipath probabilistic data association (MPDA) exploits discrete multipath propagation to improve tracking performance for systems such as over-the-horizon radar (OTHR). The original formulation assumed a known ionospheric environment for mapping radar measurements to ground coordinates. We consider an extension of the technique that allows for ionospheric uncertainties affecting the transformation between slant and ground coordinates in addition to the usual sensor noise. A new technique, MPDA for uncertain coordinate registration (MPCR), is described and tested on simulated and real OTHR data. The study assumes a two-layer spherical mirror ionosphere with random fluctuations of the ionospheric heights around known mean values. An extensive Monte Carlo analysis of track errors and track loss is carried out for MPCR under two scenarios and the results are compared with a baseline probabilistic data association (PDA) approach and with MPDA. The results indicate the high reliability of the MPCR approach. 相似文献
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传统的遥测体制已经不能满足日益增长的飞行试验需求,新型TmNS(Telemetry Network System,遥测网系统)需要RF(Radio Frequency,射频)网络管理来协调资源分配,以满足性能要求.首先介绍了TmNS的总体架构,其RF链路除传统下行遥测链路外,新增了一条双向数据链路,实现多个试验对象和多个地面站的组网.随后讨论了该网络系统RF链路管理的原理和流程.由于链路管理器根据网络容量来分配TxOp (Transmission Opportunity,传输机会),故重点研究和比较了2种动态容量分配算法——B-LM算法和E-LM算法,ELM算法较B-LM算法略复杂,但可以减小系统延时,二者可以在链路管理器中共存,依据网络情况进行配置或切换.最后简要分析了链路管理器的软件结构.RF网络管理是TmNS的一项关键技术,该研究将促进我国新一代遥测网的发展. 相似文献