地地导弹天文导航的一种建模方法

介绍了远程地地弹道式导弹采用惯性／天文组合制导方案的优点。提出了以惯性导航为主、天文导航为辅的一种导航方法，推导出该方法对应的导航基准参数计算模型、导航参数计算模型及天文导航系统的横向导引方程。最后通过仿真计算，给出了所提供的天文导航方法和计算模型对提高导弹命中精度的效能。     

大圆航行轨迹发生器的设计

轨迹发生器广泛应用于惯性导航与组合导航仿真研究之中,它不仅提供实时角速率和比力值,而且还用来直观检验惯性导航或组合导航算法的正确性、优劣性和误差大小.本文基于惯性导航的基本方程,设计了用于捷联惯导的大圆航行轨迹发生器.针对误差公式推导复杂的特点,用导航仿真的方法对其输出的角速率和比力进行了精度估计,验证了设计的正确性.     

关于LTN—72R惯性导航系统定位的几个问题

LTN-72R 惯性导航系统是一个高可靠性、全天候、全球惯导系统。它可单套惯导系统工作,也可作三重位置混合系统工作。惯性即时位置可以使用无线电测距和全向信标导航装置自动更新。本文介绍单套惯导系统、三重位置混合、自动无线电位置更新的基本原理和方法。     

无人作战飞机自主控制技术研究

归纳了UAV控制的一般特点,分析了无人作战飞机自主控制的基本需求,设计了实现自主控制技术的创新性MMS/EVMS结构,提出了可变权限自主的结构和实现方法。本研究结果对无人作战飞机自主控制技术的研究具有一定的理论价值和参考意义。     

用于被动寻的导弹的带末端落角约束的变结构导引律

使被动寻的导弹在较低的平飞弹道情况下，以较小的俯冲过载和最佳攻击姿态精确命中目标；采用带落角约束的变结构导引律，对弹目距离及距离变化率进行估计，克服被动寻的导弹不能测距的约束，同时使切换开关增益随时间自适应变化以减小俯冲过载；利用某型在研被动寻的导弹的气动参数，对此变结构导引律进行了数学仿真，仿真结果表明，在较低的平飞弹道约束条件下及过载要求范围内，该导引律能以期望落角命中静止与机动的坦克目标，对弹目距离变化率及距离的较大估计误差具有较强的鲁棒性。     

用Radon变换迭代法重建含有遮挡物的三维折射率场

本文通过计算机模拟研究，结合气体折射率场的光验知识．考查了将Ｒａｄｏｎ变换迭代法用于光学干涉层析计量含有遮挡物的三维折射率场的重建精度。作为一个应用实例，测量和计算了某一截面的气体温度分布，并与热电偶测量的值进行了比较。     

基于联邦滤波器的新型故障检测结构及算法

提出了一种基于联邦卡尔曼滤波器的故障检测结构,该结构利用各局部滤波器和参考滤波器共有状态之间的残差进行故障检测.并提出了2种故障检测算法:χ2检验法和Elman神经网络检验法.以组合导航系统为例进行了仿真研究,和其它算法相比该算法计算简单、可靠,不但可以快速检测出外部传感器及参考系统故障,且具有很好的容错性能,能快速检测出故障并进行隔离,使融合后系统依然保持较高精度.     

Precise line-of-sight modelling for angles-only relative navigation

This work presents a precise analytical model to reconstruct the line-of-sight vector to a target satellite over time, as required by angles-only relative navigation systems for application to rendezvous missions. The model includes the effects of the geopotential, featuring: the analytical propagation in the mean relative orbital elements (up to second-order expansion), the analytical two-way osculating/mean orbital elements’ conversion (second-order in $J_2$ and up to a given degree and order of the geopotential), and a second-order mapping from the perturbed osculating elements’ set to the local orbital frame. Performances are assessed against the line-of-sight reconstructed out of the precise GPS-based positioning products of the PRISMA mission. The line-of-sight modelled over a far-range one day long scenario can be fitted against the true one presenting residuals of the order of ten arc-seconds, which is below the typical sensor noise at far-range.     

磁选态单束铯束管束光学参数的模拟计算和设计

为提高铯束管跃迁信号强度,在束光学参数设计中,用蒙特卡罗方法模拟计算铯原子通过率和未跃迁比例。通过改变模拟计算中的束光学参数,分析铯原子通过率、未跃迁比例和倍增器首极电流的变化趋势,得到了主要束光学参数的合理取值范围。在铯束管实际装配和试验中使用束光学参数设计结果,有效地增加了倍增器首极电流。     

A fast pulse phase estimation method for X-ray pulsar signals based on epoch folding

X-ray pulsar-based navigation (XPNAV) is an attractive method for autonomous deep-space navigation in the future. The pulse phase estimation is a key task in XPNAV and its accuracy directly determines the navigation accuracy. State-of-the-art pulse phase estimation techniques either suffer from poor estimation accuracy, or involve the maximization of generally non-convex object function, thus resulting in a large computational cost. In this paper, a fast pulse phase estimation method based on epoch folding is presented. The statistical properties of the observed profile obtained through epoch folding are developed. Based on this, we recognize the joint prob-ability distribution of the observed profile as the likelihood function and utilize a fast Fourier transform-based procedure to estimate the pulse phase. Computational complexity of the proposed estimator is analyzed as well. Experimental results show that the proposed estimator significantly outperforms the currently used cross-correlation (CC) and nonlinear least squares (NLS) estima-tors, while significantly reduces the computational complexity compared with NLS and maximum likelihood (ML) estimators.