便携式红外寻的防空导弹——单通道控制的自动驾驶仪

导弹采用单通道控制，虽然系统简单，但控制技术复杂。从这类自动驾驶仪特点出发，在介绍其功能、组成、控制方式基础上，对设计、分析、试验中遇到的技术问题提出了解决途径和方法，并对此类驾驶仪的数字化问题提出了设想和看法。     

多用途飞机使用效能指标体系研究

根据我国国情与通用航空现状,多用途飞机是未来通用航空主要发展方向之一,对多用途飞机效能进行有效评估具有重要意义,而建立科学的评估指标体系是保证效能评估结果科学有效的前提和基础。在列举效能评估方法及飞机效能指标的基础上,初步建立多用途飞机使用效能指标体系,将多用途飞机综合使用效能分为4层,其中第一层级单项作业效能可进一步...     

Real-time fault detection method based on belief rule base for aircraft navigation system

Real-time and accurate fault detection is essential to enhance the aircraft navigation system’s reliability and safety. The existent detection methods based on analytical model draws back at simultaneously detecting gradual and sudden faults. On account of this reason, we propose an online detection solution based on non-analytical model. In this article, the navigation system fault detection model is established based on belief rule base (BRB), where the system measuring residual and its changing rate are used as the inputs of BRB model and the fault detection function as the output. To overcome the drawbacks of current parameter optimization algorithms for BRB and achieve online update, a parameter recursive estimation algorithm is presented for online BRB detection model based on expectation maximization (EM) algorithm. Furthermore, the proposed method is verified by navigation experiment. Experimental results show that the proposed method is able to effectively realize online parameter evaluation in navigation system fault detection model. The output of the detection model can track the fault state very well, and the faults can be diagnosed in real time and accurately. In addition, the detection ability, especially in the probability of false detection, is superior to offline optimization method, and thus the system reliability has great improvement.     

Real-time coseismic wave retrieving by integrated Kalman filter with observations of GPS,Glonass and strong-motion sensor

A method of real-time coseismic wave retrieving was proposed based on the tight integration of GPS, Glonass and strong-motion sensor observations, the validation and precision analysis have been made by an experimental data. The series of results have been shown that: by the integrated Kalman filter and multi-sensors, the coseismic waves can be optimally recovered by complement the advantages of each other, especially when the observation conditions are very bad. In additional, the results are not significantly effected by different receiver clock error processes for the integration solution.     

天津市发展物流业的若干分析与建议

首先，从宏观角度出发，分析了天津市在京津冀经济圈中所处的地位及其在“十五”期间经济发展状况。又应用了区位熵的概念，分析天津市各类制造业的比较优势，从而论证了天津市发展物流中心的宏观可行性。接着，立足于世界港口集装箱吞吐量的预测，结合天津港保税区和天津空港物流加工区“十五”期间的发展，分析了天津市建设现代航运中心和物流中心所面临的机遇以及应注意的宏观机制问题。     

旅游目的地的整合营销策略探析

随着旅游市场的逐步成熟和竞争的不断加剧，旅游目的地树立正确的营销观念是获得竞争优势、占领市场的关键。旅游业的广泛性和多样性，使得目的地非常适宜进行整合营销。本文运用整合营销理论，分析旅游目的地的整合营销策略，主要分析旅游目的地形象的整合、营销组合策略的整合以及品牌信息传播的整合。     

供应链变迁与航空货运经营模式的转变

通过对供应链理论的演变过程、渠道理论及目前中国航空货运经营模式的分析,认为中国航空货运已经具备了采用多种经营模式的能力,并且应当进行经营模式的转变;在采用多种模式时,首先要处理好渠道冲突和合作问题。     

航空专用测试设备可计量性设计

提出了航空专用测试设备可计量性设计的概念,将专测设备设计与计量联系起来,从设计源头就考虑计量的方便,对航空综合后勤保障建设有积极意义。     

双星定位系统及其备份星在近地卫星联合定轨建模中的应用

建立了基于双星定位系统距离和观测数据的近地卫星联合定轨模型,设计了相应的数值融合联合定轨算法;为进一步提高近地卫星定轨精度,考虑融合双星及备份星距离和观测数据,建立了基于双星和备份星的近地卫星联合定轨模型及实现算法,并针对不同仿真条件进行了联合定轨仿真实验。仿真计算结果表明,联合定轨方式较传统近地卫星精密定轨方式可以更好地抑制双星星历误差对近地卫星定轨精度的影响,近地卫星和双星的定轨精度均得到了一定程度的提高;同时,融合备份星观测数据的近地卫星联合定轨精度得到进一步改善,达到5.17m。