1553B通信协议的可依赖性讨论  

Research on Dependability of 1553B Protocol

作　　者：杨福宇 

机构地区：[1]重庆工业自动化仪表研究所,重庆400123

出　　处：《单片机与嵌入式系统应用》2017年第1期5-8,共4页Microcontrollers & Embedded Systems

摘　　要：1553B是飞机电传系统的通信协议,由于硬件上抗干扰仅考虑了系统内部自生的干扰,实际环境要严重得多;因为只按奇偶位作校验,所以错字漏检的概率比较大;由于回传状态字内容不全面,在漏检错字时会发生假冒错;由于指令字出错不易纠正,最好情况下靠2次重传,丢帧可能性大。漏检错帧和丢帧多会使多重冗余的表决机制失效,也会使网络管理类指令失效,成为潜伏的故障。通过定量分析,确定了一些情况下的失效率,例如假定取CAN,Profesafe同样的误码率ber=0.01时,除去最大值/最小值再取均值时的4冗余系统因错字漏检引起的每小时失效可达2×10-1次。1553B is a communication protocol used in x-by-wire system. The noise margin considered in hardware is just its internal pro- duced part. The real EMI is far more serious than that. The error check in word is just a parity bit,hence the undetected error rate will be large. The status word just includes part contents of the command word. The masquerade error will happen due to undetected error. The bus command node is hard to correct the error in command word transmission. It can retry twice at most. This will lead to the message lost. Undetected erroneous message and message lost will cause corruption of multiple redundant systems. They also can cause network management fail and form a latent fault. In undetected error case,if bet=0.01 （like that in CAN and Profisafe）, a quadruple redundant system （drop maximum and minimum inputs,take average of rest two inputs as output） may fail 2 × 10 -1 times in an hour.

关 键 词：1553B 可依赖性 功能安全 电传故障 

分 类 号：TN915.04[电子电信—通信与信息系统]