一、引言自测试技求作为一种保障系统可靠性的关键手段已广泛地应用于实时系统中。实时系统可能会由于本身的可靠性问题以及环境对其的影响而发生错误或故障,而实时系统不可能象批处理系统那样有充分的时间来纠正错误。由于它的实时性,一旦发生故障,就应该在最短的时间内使系统恢复正常,或者 I. INTRODUCTION Self-test technique is widely used in real-time system as one of the key means to ensure system reliability. Real-time systems can experience errors or failures due to their own reliability issues and environmental effects, and real-time systems can not have as full time as batch systems to correct errors. Because of its real-time nature, in the event of failure, it should be in the shortest possible time the system back to normal, or