机载计算机的可测试性工程设计（DFT）

摘要

安装在飞机上的嵌入式计算机，称为机载计算机，它的可测试性设计是整个设计中的非常重要的方面。设计要求在每次飞行前，机载计算机都需要进行自测试，确定机载设备的完好性；在空中飞行中，需要对计算机进行实时测试，以确保计算机运行的正确性。当测试发现故障时，应立刻告警或进行应急处理。本文在介绍机载计算机的可测试性设计原理和测试分类的基础上，提出了在不同的测试级别上的可测试性工程设计技术。%Design for testability is critical for airborne computer,a kind of embedded computer used in aircraft.In order to determine airborne facility in good condition and working in right state,airborne computer is being tested (usually self-test) pre-flight as well as in flight.If there are some errors,airborne computer should report the error and take an emergency action.On the basis of design for testability in airborne computer principle and testability classification,design technique of testability in different test hiberarchy is presented.