基于频谱分析判定接收机错锁的方法研究

目前判定接收机错锁仅仅凭借经验,导致目标捕获时间长。本文基于模拟调相信号相干解调输出信号的谱线特征,提出一种新的简单判定接收机错锁的方法。采用该方法方便地实现了频率引导的闭环控制,提高了接收机的自动化程度。     

飞行器最优末制导律的自适应PID滑模设计

针对传统最优末制导律作用下再入飞行器易受外界因素干扰和气动力变化的影响,致使命中精度较低、鲁棒性较差的问题,在弹目运动方程存在参数不确定性情况下,提出一种基于自适应PID滑模扰动观测器技术的鲁棒最优末制导律。其中滑模扰动观测器能够在线消除系统扰动影响,而自适应PID滑模可以有效去除抖振。基于Lyapunov稳定性理论的证明过程及数值仿真结果均表明,该末制导律不仅使飞行器各项性能指标均达到指标要求,并且保证了较高的命中精度和较强的鲁棒性。     

一种基于速度倾角的闭路制导方法

通过分析固定速度倾角时,需要速度求解的特点,结合闭路制导的基本原理和过程,提出了一种基于速度倾角的闭路制导方法.详细分析了运用此方法时需要速度的确定方法、导引信号求解和闭路制导的计算步骤.仿真结果证明,所提出的闭路制导方法能够有效的简化需要速度计算和导引过程,精度也较高,其在工程应用上具有较好的前景.     

浅议邦达至拉萨航线的放行工作

高原机场由于其特殊的地理环境导致了特殊的恶劣的气象环境,使得航空公司对此类航线的运行控制难度很大。本文通过对邦达-拉萨航线上天气、跑道道面、航行通告等方面的分析,阐述邦达-拉萨这条特殊的高原-高原航线的运行特点和运行控制的难点。     

飞院川内航线网络优化浅析

对中国民用航空飞行学院（以下简称飞院）当前的训练能力进行分析,并结合空域规划知识,在飞院川内原有大三角航线的基础上,增加阆中机场,划设出新的航线,使得阆中机场与原有的四个机场的航线更好地衔接起来。同时,对原有的低空仪表转场训练高度进行重新配备,并对部分航线做出调整。     

小天体自主附着技术研究进展

基于国际上已实施的小天体探测任务和未来小天体附着探测技术的发展趋势,阐述了小天体自主附着的必要性及关键技术。首先回顾了已成功实施的小天体探测任务的特点,进而总结了小天体自主附着的难点问题,概括分析了小天体自主附着所涉及的关键技术及其研究进展,最后对未来小天体自主附着技术的研究热点和发展趋势进行了展望。     

火星精确着陆制导问题分析与展望

美国火星科学实验室(MSL)任务成功将“好奇”号火星车着陆到火星表面,开创了火星精确着陆探测的新局面。以MSL着陆任务为典型代表,分析了目前火星着陆探测进入、下降和着陆（Entry, Descent and Landing, EDL）过程的制导方案及制导系统的发展趋势。以在火星高海拔、复杂地形区域定点着陆为潜在工程目标,归纳了火星EDL过程面临的制导主要问题。根据未来制导系统自主性和自适应性的技术需求及潜在工程任务制导面临的问题,提出了火星EDL制导方面需要解决的关键技术,并对其在未来工程中的应用潜力进行了展望。     

A six-degree-of-freedom hardware-in-the-loop simulator for small spacecraft

This paper presents a novel six degree of freedom, ground-based experimental testbed, designed for testing new guidance, navigation, and control algorithms for the relative motion of nano-satellites. The development of innovative guidance, navigation and control methodologies is a necessary step in the advance of autonomous spacecraft. The testbed allows for testing these algorithms in a one-g laboratory environment. The system stands out among the existing experimental platforms because all degrees of freedom of motion are controlled via real thrusters, as it would occur on orbit, with no use of simulated dynamics and servo actuators. The hardware and software components of the testbed are detailed in the paper, as is the motion tracking system used to perform its navigation. A Lyapunov-based strategy for closed loop control is used in hardware-in-the loop experiments to successfully demonstrate the full six-degree-of-freedom system׳s capabilities. In particular, the test case shows a two-phase regulation experiment, commanding both position and attitude to reach specified final state vectors.     

考虑自动驾驶仪动态特性的含攻击角约束的反演递推制导律

针对制导武器需要攻击角度控制的要求及自动驾驶仪动态特性对制导效果的不利影响,提出了考虑自动驾驶仪动态特性补偿、具有末端攻击角约束的反演递推制导律。首先结合反馈线性化技术,利用本文推广的积分反演定理设计了二阶子系统的虚拟控制律;然后进一步应用反演递推方法推导了考虑自动驾驶仪动态特性的含攻击角约束的制导律,并通过李雅普诺夫稳定性理论详细地证明了该制导律对于视线角和视线角速率的指数收敛特性。在实例应用仿真中,给出了该制导律的具体实现方法,比较了该制导律与其他制导律的制导性能,检验了该制导律对不同作战任务的制导效果。仿真结果表明,该制导律具有良好的性能和工程应用推广价值。     

Improving seeking precision by utilizing ghost imaging in a semi-active quadrant detection seeker

Conventional semi-active laser guidance takes advantage of the laser designator to illuminate the stable and uniform laser spot on target precisely. The seeker collects the reflected light by a quadrant detector and outputs the relative position information to guide the missile to the illuminating laser spot. However, the designation and guidance accuracy could be jeopardized by the randomly drifting of laser spot caused by the instability of designation platform and air turbulence. In this work, ghost imaging technique is adapted to a quadrant detector semi-active seeker by utilizing structured illumination on the target. With a series of structured illumination masks, the signals from the quadrant detector are multiplexed to perform calculation of the target relative position as well as image reconstruction of the illuminated area simultaneously. Automatic target recognition methods could be further applied to the reconstructed image to calculate the designating error and correct the guidance. The results of simulation and experiment demonstrate that the proposed method could improve the guidance accuracy in many circumstances which would lead to attacking deviation if conventional semi-active laser guidance is used.