共查询到19条相似文献,搜索用时 531 毫秒
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三维非线性鲁棒制导律 总被引:1,自引:0,他引:1
建立了球坐标系下的三维导弹与目标相对运动模型,基于Lyapunov方法和输入状态稳定性(ISS)分析,设计了非线性三维鲁棒制导律,不需要估计目标加速度,实现了对机动目标的扰动抑制跟踪,并且比传统的比例制导律在拦截时间及鲁棒性方面具有优势。仿真结果表明,对于目标作复杂的大机动逃逸运动,仍然能够取得较好的跟踪性能和鲁棒性。 相似文献
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比例导引规律相比于直接追踪法,跟踪精度有所提高,但是在目标机动性加大的情况下,传统比例导引规律制导精度仍不理想.因此,给出了三维空间导弹-目标追逃运动的空间矢量方程,建立了三维空间导弹-目标追逃运动模型,并基于李雅普诺夫稳定性理论,设计增广比例导引律(APNG).即在比例制导规律基础上,引入目标加速度补偿项来克服目标加速度对制导精度的影响.将该方法运用于机动目标的跟踪,仿真结果表明了增广比例导引律相比于传统比例导引律,制导精度高,脱靶量低,制导飞行时间短,制导性能有极大的提高. 相似文献
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《Industrial Electronics, IEEE Transactions on》2008,55(11):3972-3984
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为了解决三维空间内的机动目标跟踪问题,提出一种基于常速模型和带约束常速率协同转弯模型(CSCT模型)的交互式多模型算法;同时为了解决目标的机动不确定性问题,针对CSCT模型提出一种类似卡尔曼滤波的方法实时精确地估计目标转弯角速度。综合考虑目标角速度的估计值和估计方差,提高目标跟踪的收敛速度,尽可能地减小滤波角速度与机动目标真实角速度之间的误差,最终明显提高了目标跟踪精度。Monte-Carlo 200次仿真结果表明了该算法在性能上有明显提升,对三维机动目标跟踪效果显著,并证实了该方法的实用性。 相似文献
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《IEEE transactions on information theory / Professional Technical Group on Information Theory》1975,21(6):662-663
Signal-to-noise ratio (SNR) in the output of a zero-memory nonlinearity is defined and found when the input is a complex Gaussian process. The results are applied to an oddnu prime th law device and to an analog-to-digital (A/D) converter exhibiting both saturation and quantization. 相似文献
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Jun Oh Jang 《Mechatronics》2009,19(4):529-534
A neuro-fuzzy networks (NFN) saturation compensation scheme for DC motor systems is presented. The scheme that leads to stability, command following, and disturbance rejection is rigorously proved. The on-line weights tuning law, the overall closed loop performance, and the boundedness of the NFN weights are derived and guaranteed based on the Lyapunov approach. The actuator saturation is assumed to be unknown and the saturation compensator is inserted into a feedforward path. The simulation and experimental results show that the proposed scheme can effectively compensate for the saturation nonlinearity in the presence of system uncertainty. 相似文献
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Russell Kohl Daniela Milovic Essaid Zerrad Anjan Biswas 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(5):526-537
Optical solitons in a non-Kerr law media is studied in this paper in presence of perturbation terms. This is governed by the Nonlinear Schrödinger’s equation. He’s semi-inverse variational principle is used to carry out the integration of this perturbed Nonlinear Schrödinger’s equation with non-Kerr law nonlinearity. The types of nonlinearity that are considered are Kerr, power, parabolic and dual-power law. The parametric domain is also identified for the solitons to exist. 相似文献
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分别从分单输入单输出系统(single-input single-output, SISO)与多输入多输出系统(multiple-input multiple-output, MIMO)研究了多天线系统中射频接收机非线性对通信系统性能的影响规律,发现原有对非线性分集与复用折中的定义不再适用于考虑射频接收机非线性情况,并给出了适用于考虑射频接收机非线性情况的新定义. 通过复合信道建模推导了非理想情况下分集增益的定义和中断概率表达式,仿真了考虑射频接收机非线性时多天线系统分集增益与复用增益关系曲线,得出了考虑分集与复用折中时目标速率的增长规律. 理论和仿真表明,传统的分集增益和复用增益的定义并不适用于考虑接收机非线性的实际情况,SISO系统中射频接收机非线性对分集与复用的折中影响与理想情况一样,MIMO系统中需要对原有的分集增益和复用增益进行修正才能得到分集与复用的最优折中. 相似文献