共查询到19条相似文献,搜索用时 140 毫秒
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系统模型和滤波算法是机动目标单站无源定位跟踪要解决的核心问题。文中采用截断正态概率模型和一种新型的滤波算法--容积卡尔曼滤波,对机动目标进行单站无源定位跟踪。针对目标突发机动的情况,借鉴强跟踪滤波器的思想,在滤波过程中引入时变渐消因子,提出了一种强跟踪容积卡尔曼滤波算法(Strong Tracking Cubature Kalman Filter,STCKF)。该算法利用容积数值积分原则直接计算非线性随机函数的均值和方差,实现简单,估计精度高,并通过渐消因子自适应在线调节增益矩阵,增强了系统对突发机动的跟踪能力。结合空频域单站无源定位模型进行仿真实验表明,STCKF算法在对一般机动目标进行跟踪时,性能与CKF算法相当,并优于传统的EKF算法。当目标突变大机动时,STCKF算法的滤波性能要高于EKF以及CKF算法。 相似文献
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代价参考粒子滤波算法通过动态优化自定义代价函数和风险函数来衡量状态滤波估计的质量,选取最优的状态估计.与粒子滤波算法相比其优点是不需要任何先验概率知识的假定和重采样过程可实现并行处理.将代价参考粒子滤波与当前统计模型的优点相结合,提出一种新的当前统计模型自适应跟踪算法,用于非线性非高斯系统的机动目标跟踪.Monte Carlo仿真表明,该算法跟踪精度优于标准的交互多模型算法和当前统计模型自适应跟踪算法,实时性好于当前统计模型高斯粒子滤波算法. 相似文献
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基于“当前”统计模型的基础上 ,利用位移预测估计与实时位移估计间的偏差进行自适应方差调整 ,提出了一种新的自适应滤波算法———位移估计自适应跟踪算法 (AdaptiveFilteringAlgorithmofDistanceEstimation简记为ADE)。大量仿真结果表明 ,采用ADE算法既保持了对机动目标的跟踪性能 ,又显著提高了对弱机动目标及非机动目标的跟踪精度 相似文献
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红外与激光主/被动联合跟踪算法 总被引:7,自引:0,他引:7
文中针对单站红外被动式跟踪存在可观测性问题,提出红外与激光主/被动单目标联合跟踪方法。该方法首先针对三维空间任意机动目标的跟踪问题,将参考文献[1]给出的一维机动目标“当前”统计模型推广到三维情况,得到三维情况下跟踪任意机动目标的状态方程和跟踪系统的非线性测量方程,然后对红外探测器测量的角度信息和激光测得的距离信息进行融合对准,得到正确的测量值。最后,提出扩展的自适应卡曼滤波算法并进行了仿真研究。仿真研究表明方案可行,可同时对三维空间目标的位置、速度、加速度进行估计。 相似文献
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研究输入、输出观测数据均受噪声干扰时的非线性Volterra系统的全解耦自适应滤波问题.基于总体最小二乘技术和Volterra滤波器的伪线性组合结构,运用约束优化问题的分析方法研究Volterra滤波过程,从而建立了一种总体全解耦自适应滤波算法.并建立了分析该算法收敛性能的参数反馈调整模型,分析表明,该算法可使各阶Volterra核稳定地收敛到真值.仿真实验的结果表明,当输入、输出观测数据均受噪声干扰时,总体全解耦自适应滤波算法的鲁棒抗噪性能和滤波精度均优于全解耦LMS自适应滤波算法. 相似文献
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A novel step-by-step linearization high-order Extended Kalman filter SH-EKF is designed for a class of nonlinear systems composed of linear functions and the product of several separable basic functions. The basic functions in the state and measurement models are defined as latent variables; the state and measurement models are equivalently formulated into pseudo-linear models based on the combination of the original variable and the latent variables; latent variables are regarded as new variables, and a dynamic linear model between each latent variable and other latent variables with original state is established;the measurement model is rewritten into the first-order linear product form between the current state and each latent variable; latent variables are solved by Kalman filter step by step, and a stepwise linearized high-order extended Kalman filter is designed. Illustration examples are presented to demonstrate the effectiveness of the new algorithm. 相似文献
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基于伪线性卡尔曼滤波的多站IRST系统跟踪技术 总被引:8,自引:0,他引:8
建立了目标的多站IRST(红外搜索与跟踪)系统的伪线性观测模型,基于该模型提出了匀速运动目标的伪线性卡尔曼滤波算法.算法利用伪线性方程组获得滤波器的初值,从而提高了滤波器的跟踪精度和速度.分别采用伪线性卡尔曼滤波器与推广卡尔曼滤波器对目标进行跟踪的仿真结果表明:当探测器数目为3、4时,在跟踪初始阶段.曲线性卡尔曼滤波器在跟踪的速度和精度方面均优于推广卡尔曼滤波器,在稳定阶段,两者的性能基本相仿.当探测器数目为6时,则不论是在跟踪的初始阶段,还是在稳定阶段,伪线性卡尔曼滤波器与推广卡尔曼滤波器的性能基本相同. 相似文献
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Karthikeyan Reddy Shanthi Pavan 《Analog Integrated Circuits and Signal Processing》2010,63(3):397-406
A state variable block diagram method is given for the realization of universal biquadratic transfer functions employing second-generation
current-controlled conveyors (CCCIIs). Using minimum number of passive components and properly adjusting the bias currents
of CCCIIs, the proposed circuits can realize all the tunable frequency standard filter functions: high-pass, band-pass, low-pass,
notch-pass, and all-pass by choosing appropriate input branches without changing the passive elements. These presented circuits
are in current-mode and voltage-mode separately. The non-ideality analyses of these configurations are given. Additionally,
a high-order low-pass filter derived from the proposed voltage-mode biquadratic filter is introduced. PSPICE simulation results
are included to verify the theory. 相似文献
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JANAN E. ALLOS SALEH R. AL-ARAJl SALEH H. KHADHOURI 《International Journal of Electronics》2013,100(1):221-234
An adaptive second-order phase-locked loop is proposed which keeps the loop within the pseudo-linear region for a wide range of input frequency steps. FETs are used to vary the filter transfer function as well as the overall loop gain, thus yielding almost linear behaviour. Theoretical analysis of the proposed system has been carried out, and the system has been constructed to show that it is possible to increase this region for the loop from a frequency step of 353.5 rad/s to 3535 rad/s without affecting its noise-rejection property. 相似文献