【作者】 李东；

【导师】 袁建平；

【作者基本信息】 西北工业大学 ， 飞行器设计， 2001， 硕士

【摘要】 传统地基导航信标台与现代卫星导航系统组合，显示出极强的性能优势，代表了导航技术的一个发展方向。本文设计了一种军民用信标/GPS组网导航系统方案，并结合本学科特点，研究精密导引翼伞GN&C系统设计方法，建立数学模型并仿真。主要工作包括：1．分析导航系统发展现状，概述导航信标台的原理和新特点，以及国内外应用 情况：介绍现代战争对精密制导、导航战攻防策略等方面提出的新要求，及 未来发展趋势。2．比较已有地基导航系统结构、性能、特点，在此基础上，结合现代战争对导 航系统提出的新的要求，设计一种区域覆盖的信标/DGPS组网导航系统方案， 并对其关键技术进行研究。3．概述当前国内外在精密导引翼伞项目上的发展现状，分别针对扁圆型可控伞 和翼型可控伞，研究导航、制导、控制子系统的特点和性能要求，并以制导 策略为重点，提出设计方案，分析关键技术。4．具体分析了应用相对GPS/差分GPS技术实现翼型伞精确投放的可行性，并 设计系统工作模式和信号格式，建立误差模型。5．针对扁圆形可控翼伞，建立其动力学方程，并在合理的简化条件下，讨论平 衡运动状态附近稳定性分析方法，给出有参考价值的结果。6．建立精密导引翼伞GN&C系统设计中需要的其它数学模型，包括：附加质量 模型、开伞动载模型、雀降操纵模型、阵风模型、气压牵拉执行机构模型、 径向归航导引准则模型等。在各种不同因素影响条件下，对雀降操纵过程中 速度、位置变化规律进行量化研究，并对结果进行分析。更多还原

【Abstract】 The integration of conventional radio beacon and satellite navigation system has shown a great many of advantages in cost-performance, and it represents a developing trend of navigation technology. In this thesis, the network schema of multi-station system, which includes radio beacons and GPS, is designed in details. This novel technology can be applied to many kinds of commercial and military projects, such as the GN&C system of controllable parachute/parafoil. Apparent performance improvement can be observed. The main work of this paper is: 1. The current status of navigation system is introduced as well as the principles and new features of radio beacon. While considering the precision guidance ability and attacking-defending strategies, some new requirements that modem warfare imposed on navigation system are generalized. 2. By comparing the structures, specifications and features of existing terrestrial navigation systems, a RB/DGPS network is framed and designed, which can achieve local area coverage and meet the requirements of modem warfare. Some key technologies are also investigated. 3. Current status of precision guided airdrop system in several countries is introduced briefly. Then aiming at controllable parachute and parafoil respectively, the GN&C subsystems are explored. With the emphases on guidance strategy, the schema is presented and some critical technologies are analyzed. 4. The feasibility of using Relative GPS and Differential GPS to achieve precision guidance and control is analyzed. Operating mode and signal structure are designed and some useful conclusion is drawn. The quantitative expressions of biases/errors in RGPS/DGPS mode are deduced. 5. By using rigid body-rigid body hypothesis, the equation of motion with eleven degrees of freedom is founded. According to the simplified model, stability criteria are given. 6. Other mathematical models are built, including the model of apparent mass, the model of parachute opening dynamic load, the model of flare landing control, the model of changing wind field, the model of Pneumatic Muscle Actuator and the model of radial homing gliding. All of them are absolutely necessary to the design of GN&C system. In particular, the pattern of position and velocity during flare landing are plotted with specific parameter variation.更多还原