软件抗干扰技术在航天靶场中的应用

讨论了航天靶场应用的软件延时技术、通道软件抗干扰技术、程序运行中的软件抗干扰技术、数据采集误差的软件抗干扰技术等常用的软件抗干扰技术,这些措施的综合应用可以有效提高航天靶场的抗干扰性.     

卫星高功能密度综合电子系统设计

微小卫星综合电子系统承载了卫星大部分功能，是卫星任务处理和控制的中心，未来新的智能化应用、星群应用、通信服务等需求也将由卫星执行，对综合电子系统提出了新的要求。分析了国外典型小卫星综合电子系统，具有功能综合度高、多数功能集中在一台计算机中、卫星功能软件化的特点。设计了基于软件定义的综合电子系统一体化结构，硬件采用高度集成的模块化设计，软件采用分层和组件化设计，将系统功能进行分层，通过软件定义组件的方式实现各层功能和业务。高功能密度综合电子系统由一个通用化的高性能硬件平台和各种可加载的APP软件组成，除传统功能外，还可扩展自主任务管理、星间组网和载荷管理等功能，不仅使卫星的集成度和功能密度大幅提升，还能实现卫星功能重构，达到一星多用、一星多能的目的，有利于紧急时期卫星系统快速构建与应用，对于未来星座组网应用也具有一定意义。     

宽带综合射频前端三种实施方案

首先描述了军机上射频传感器的现状，介绍了综合射频收发机三种实施方案及其优缺点和应用，其次针对各种不同实施方案存在的缺点给出了改进措施，最后给出了未来综合射频前端的发展趋势及努力方向。 [关键词] 综合射频前端技术；发射机；接收机；中频架构；零中频；数字收发机     

A roadmap towards a space-based radio telescope for ultra-low frequency radio astronomy

The past two decades have witnessed a renewed interest in low frequency radio astronomy, with a particular focus on frequencies above 30 MHz e.g., LOFAR (LOw Frequency ARray) in the Netherlands and its European extension ILT, the International LOFAR Telescope. However, at frequencies below 30 MHz, Earth-based observations are limited due to a combination of severe ionospheric distortions, almost full reflection of radio waves below 10 MHz, solar eruptions and the radio frequency interference (RFI) of human-made signals. Moreover, there are interesting scientific processes which naturally occur at these low frequencies. A space or Lunar-based ultra-low-frequency (also referred to as ultra-long-wavelength, ULW) radio array would suffer significantly less from these limitations and hence would open up the last, virtually unexplored frequency domain in the electromagnetic spectrum.A roadmap has been initiated by astronomers and researchers in the Netherlands to explore the opportunity of building a swarm of satellites to observe at the frequency band below 30 MHz. This roadmap dubbed Orbiting Low Frequency Antennas for Radio Astronomy (OLFAR), a space-based ultra-low frequency radio telescope that will explore the Universe’s so-called dark ages, map the interstellar medium, and study planetary and solar bursts in the solar system and search them in other planetary systems. Such a radio astronomy system will comprise of a swarm of hundreds to thousands of satellites, working together as a single aperture synthesis instrument deployed sufficiently far away from Earth to avoid terrestrial RFI. The OLFAR telescope is a novel and complex system, requiring yet to be proven engineering solutions. Therefore, a number of key technologies are still required to be developed and proven. The first step in this roadmap is the NCLE (Netherlands China Low Frequency Explorer) experiment, which was launched in May 2018 on the Chinese Chang’e 4 mission. The NCLE payload consists of a three monopole antenna system for low frequency observations, from which the first data stream is expected in the second half of 2019, which will provide important feedback for future science and technology opportunities.In this paper, the roadmap towards OLFAR, a brief overview of the science opportunities, and the technological and programmatic challenges of the mission are presented.     

企业信息系统领域的软件建筑模型

将软件建筑的基本概念以及研究成果引入到企业信息系统建设中,提出了企业信息系统领域的软件建筑模型.首先对软件工程方法学的发展做了简要评述,指出了软件建筑在软件过程中的重要性.随后提出了企业信息系统领域的基于软件建筑模型,包括软件建筑模型、参考需求、参考建筑等.描述了基于该模型的软件开发过程,讨论了若干相关研究工作.     

综合模块化航电系统软件技术研究

从软件可靠性的角度对综合模块化航电(IMA)系统进行了讨论.从IMA系统的体系结构入手,研究了软件接口定义以及系统失效.具体分析了IMA软件研制过程中各角色的作用以及这种责任的分散所带来的问题.结合国内的发展现状,探讨了IMA系统测试各层次内容,为国内正在进行的四代机项目的研制及测试工作提供了一些思路.     

一种机载配电系统1553B总线设计

以1553B通信数据总线为研究对象,基于数字式控制器（DCU）平台,对一种机载配电系统1553B通信数据总线进行了设计研究。在具体硬件、软件的设计过程中,结合现代数字式控制器DCU的平台,以DSP的F240为核心,以DDC公司的BU-61580协议芯片为基础,实现了机载配电系统1553B的机上通信要求,并通过地面电网联试试验验证了该设计的有效性。     

Assessment of the suitability of public mobile data networks for aircraft telemetry and control purposes

This paper provides a review of the state of the art of relevant work on the use of public mobile data networks for aircraft telemetry and control proposes. Moreover, it describes the characterisation for airborne uses of the public mobile data communication systems known broadly as 3G. The motivation for this study was to explore how this mature public communication systems could be used for aviation purposes. An experimental system was fitted to a light aircraft to record communication latency, line speed, RF level, packet loss and cell tower identifier. Communications was established using internet protocols and connection was made to a local server. The aircraft was flown in both remote and populous areas at altitudes up to 8500 ft in a region located in South East Queensland, Australia. Results show that the average airborne RF levels are better than those on the ground by 21% and in the order of −77 dbm. Latencies were in the order of 500 ms (1/2 the latency of Iridium), an average download speed of 0.48 Mb/s, average uplink speed of 0.85 Mb/s, a packet of information loss of 6.5%. The maximum communication range was also observed to be 70 km from a single cell station. The paper also describes possible limitations and utility of using such communications architecture for both manned and unmanned aircraft systems.     

用AM300型函数信号发生器建立相位测量标准装置

提出了一种建立相位测量标准装置的方法。该标准装置以AM300型函数信号发生器为主标准器,相位计、示波器、失真度测量仪、数字电压表为配套设备。对AM300型函数信号发生器的量值指标进行了测试和实验,包括：相位增量误差测试、相位绝对零度误差测试、60°幅相误差测试、测量的重复性实验和长期稳定性实验。结果表明：该标准装置测试结果准确,性能稳定可靠,具有造价低、实用性强的特点。     

航空公司机载软件管理方案探讨

主要介绍民航机载软件管理发展现状及趋势，针对目前存在的问题，提出基于新型便携式装载机和专业管理平台为核心的机载软件管理解决方案，以更好地提高生产效率，保障生产安全，适应机载软件行业发展的需要。