一种用于增强广播式自动相关监视的多数据链桥接方法

多种数据链并存是广播式自动相关监视发展所面临的一个现实问题。由于存在三种不同体制、互不兼容的视距数据链体制,严重影响基于航空器之间的空空监视效果,制约飞行流量和飞行安全保障能力的提高。提出的通过在不同体制数据链地面收发信机之间进行桥接的方法,将一个数据链网内的广播信息直接接续到另一个数据链网络,进行二次广播,可以实现不同数据链之间广播信息的直接接收,增强这种自动相关监视的空空监视效果。     

数据融合黑板型专家系统

给出了一种多传感器数据融合和黑板模型推理的专家系统的实现方法。系统以飞机平台为目标，利用多站多个传感器所获得的雷达、通信、敌我识别信息，通过多传感器数据融合和人工智能黑板模型推理，实现对飞机平台的识别和定位。     

决策单元的变更对DEA有效性的影响

文中研究C~2R模型和C~2GS~2模型,当决策单元增加或减少时,DEA有效决策单元的变化。给出了DEA有效性发生变化的一些充分条件、必要条件,以及决策单元的DEA有效性都不变化的充分必要条件。     

数字滤波在动态测量数据处理中的应用

介绍了数字滤波的原理。着重讨论了带通、点阻、带阻数字滤波器在动态测量数据处理中应用于功率谱密度计算;并提出在动态测量数据处理中应用数字滤波的建议。     

带有参考信号的直接序列扩频系统

扩频通信系统中码同步的精度及其电路的复杂程度直接影响系统的性能、体积和成本。采用发射参考信号法可以简化接收机端的码同步电路 ,从而大大减小遥控遥测系统及无线局域网中扩频接收机的体积和成本。本文给出了采用 MAXIM芯片组实现 UHF频段带有发射参考信号的直接序列扩频系统 ,并通过 System View软件进行了仿真 ,结果表明该方法可获得较好的通信性能 ,易于工程实现     

Ionosphere modelling for Galileo single frequency users: Illustration of the combination of the NeQuick model and GNSS data ingestion

The ionospheric effect remains one of the main factors limiting the accuracy of Global Navigation Satellite Systems (GNSS) including Galileo. For single frequency users, this contribution to the error budget will be mitigated by an algorithm based on the NeQuick global ionospheric model. This quick-run empirical model provides flexible solutions for combining ionospheric information obtained from various sources, from GNSS to ionosondes and topside sounders. Hence it constitutes an interesting simulation tool not only serving Galileo needs for mitigation of the ionospheric effect but also widening the use of new data.     

基于聚类模糊系统的动态数据野值剔除方法

针对影响遥测参数处理和分析的野值问题,提出了基于聚类法实时设计模糊系统实现动态数据野值辨识和剔除的新方法。该方法能够自适应跟踪不同变化特性的遥测参数,基于聚类法实现模糊系统的动态建模并获得预测值与观测值的残差序列,再按照狄克松准则实现野值的快速剔除。对实测数据的仿真实验表明：该方法能够显著降低动态建模的复杂度,快速跟踪信号变化,方法可行且有效。     

遗传算法在弹道数据融合中的应用

目前靶场采用全测元融合滤波的方式确定目标飞行器弹道,为测控设备提供引导信息并为安全决策和指挥显示提供数据支持。随着靶场测控设备种类和数量越来越丰富,而新的试验任务又对实时弹道融合解算精度提出了更高的要求,全测元融合处理能否提供高精度的融合弹道和快速地从海量融合方案中寻找最优的方案是弹道测量数据融合急需解决的问题。本文提出了基于遗传算法的最优融合方案选择方法,利用该方法得到的融合弹道精度优于全测元融合方案,仿真结果表明了方法的有效性。     

浅论无人机机载卫通天线尺寸与数字信号传输带宽关系

卫星通信是无人机中继通信的重要手段。本文对无人机卫星通信链路中飞机总体设计关注的机载卫通天线尺寸选择问题进行了较详细的计算、探讨。     

Simulation study on slant-to-vertical deviation in two dimensional TEC mapping over the ionosphere equatorial anomaly

With the rapid increase of GPS/GNSS receivers being deployed and operated in China, real-time GPS data from nearly a thousand sites are available at the National Center for Space Weather, China Meteorology Administration. However, it is challenging to generate a high-quality regional total electron content (TEC) map with the traditional two-dimensional (2-D) retrieval scheme because a large horizontal gradient has been reported over east–south Asia due to the northern equatorial ionization anomaly. We developed an Ionosphere Data Assimilation Analysis System (IDAAS), which is described in this study, using an International Reference Ionosphere (IRI) model as the background and applying a Kalman filter for updated observations. The IDAAS can reconstruct a three-dimensional ionosphere with the GPS slant TEC. The inverse slant TEC correlates well with observations both for GPS sites involved in the reconstruction and sites that are not involved. Based on the IDAAS, simulations were performed to investigate the deviation relative to the slant-to-vertical conversion (STV). The results indicate that the relative deviation induced by slant-to-vertical conversion may be significant in certain instances, and the deviation varies from 0% to 40% when the elevation decreases from 90° to 15°, while the relative IDAAS deviation is much smaller and varies from −5% to 15% without an elevation dependence. Compared with ‘true TEC’ map derived from the model, there is large difference in STV TEC map but no obvious discrepancy in IDAAS map. Generally, the IDAAS TEC map is much closer to the “true TEC” than is STV TEC map is.