综合化航空电子系统发展历程及重要支撑技术

阐述了航空电子系统结构的综合化演变过程及发展趋势,说明了航空电子综合化的作用和意义,提出了提高航空电子综合化水平需重点研究的关键支撑技术。     

美国F-22"猛禽"战斗机综合化航空电子系统概述

本文结合现代航空电子系统的发展情况,介绍了典型第四代战斗机-美国的F-22“猛禽”战斗机的技战术特点、综合化航空电子体系结构以及主要设备的功能和性能等,并提出了研究和发展建议。     

Qualification of plastic encapsulated microcircuits (PEM) for avionicsBased on ``Plastic Encapsulated Microcircuits (PEM) Qualification Testing'''', by J. A. Scalise, which appeared in the Proceedings of the 46th Electronic Components and Technology Conference, Orlando, FL, U.S.A., 28–31 May 1996, pp. 392–397. © 1996 IEEE.

Microcircuit package qualification testing is used to establish the reliability of integrated circuit processes and devices as they relate to part packaging. This paper presents the results of package qualification tests conducted on plastic encapsulated microcircuits (PEMs) and plastic discrete devices (diodes, transistors) used in avionics applications. Highly accelerated stress test (HAST) and temperature cycle (TC) test results, including part failure mechanisms and associated failure rates, are provided. A variety of plastic package styles and integrated circuit functions have been tested. Examples of package styles tested include small outline (SO), plastic leaded chip carrier (PLCC), thin small outline package (TSOP), plastic quad flat package (PQFP) and plastic dual-in-line (PDIP).Manufacturers' devices have been evaluated and various plastic compounds have been compared to determine which provide optimum reliability. The testing showed that package qualification performance of PEMs is affected by type of compound, passivation (including die coat) and die size. HAST failures are caused by moisture penetration of the package while temperature cycle failures result from coefficient of thermal expansion (CTE) mismatch effects.     

航空电子设备制造业的CIM技术

本文论述了计算机集成制造系统及其在航空电子产品制造中的重要性和迫切性。     

一种调频锁相环电路的改进尝试

介绍了一种用LC集成VCO来替换晶体压控振荡器实现调频的锁相环电路并给出了关键技术:双电调端分别实现调频和锁相;环路滤波器的设计及实验结果。该电路不仅具有低的相噪、高稳定的载波,还具有理想的音频调制频响、优良的抗震动性能和温度性能。理论分析和实践表明,该电路较之改进前的电路更能满足航空电子设备恶劣的环境要求并具有生产性。     

机载多传感器数据融合的数据链应用技术

表述了机载多传感器数据融合基本概念,侧重于描述战术数据链在多传感器信息融合中的应用。     

Scheduling Rate-Constrained Flows with Dynamic Programming Priority in Time-Triggered Ethernet

Time-triggered (TT), Rate-constrained (RC) and Best-eff ort (BE) traffics are included in Time-triggered ethernet (TTEthernet). For RC messages trans-mission is aff ected by TT messages, traditional schedul-ing policy cannot be well applied in TTEthernet. Dynamic programming priority (DPP) algorithm combines priority policy and dynamic programming algorithm for scheduling RC flows. The time slice for RC flows transmission is got by SMT solver YICES; RC flows are classified to different groups according to the priorities; Higher priority pack-ets in one time slice are scheduled using First input first output (FIFO) policy and lower priority packets are sched-uled by Dynamic programming policy. DPP policy guaran-tees different real-time requirements of heterogeneous RC flows, and make the best of time slice resource in aviation industries. The upper bound End-End of three methods and algorithm feasibility is analyzed. Simulation in avia-tion shows that DPP policy can obtain better real-time performance than other scheduling algorithms.     

基于抖动测试的AFDX端到端延迟紧性修正

AFDX引入虚拟链路(Virtual Link)实现物理带宽资源的逻辑分隔。由于数据帧的异步到达和多路复用输出造成虚拟链路的时延抖动现象,并最终导致流量端到端延迟分析的不确定性。本文提出了一种基于抖动测试值的网络演算紧缩方法。通过分布式测试,获得虚拟链路在网络中的实际传输抖动,并以此为基础,建立了流量传输精确化模型,通过流量模型的逐级修正,使端到端延迟计算结果逐级精确化。通过将抖动实际值与理论分析结果相结合,提供了网络演算悲观度及其扩散影响度量的直观对比,提高了延迟计算的紧性。     

一种组合导航系统的探讨

本文简要说明了导航设备的发展现状,并介绍了一种组合导航系统（惯性导航/多普勒导航/全球定位组合导航系统）,同时给出了它的一种实现方案,并对其应用前景作了简单的讨论。     

计算AFDX延迟的网络演算方法

介绍了航空电子全双工以太网的关键概念,并指出应用此技术时必须给出其数据帧延迟上界.分析了数据包在航空电子全双工以太网中的处理过程.给出了由网络演算方法得出的数据帧在数据接收、数据过滤、数据交换,端口存贮转发过程中的延迟.最后指出运用此方法得到的结果可作为适航依据.