AMU故障检测中测试响应压缩方法研究

Research on Test Response Compression Methods in AMU Fault Detection

测试响应压缩是对AMU故障检测过程中产生的大量数据进行处理的有效方法,如何选择一种有效的压缩方法是AMU测试中一个非常关键的问题;针对常用的两种压缩方法:奇偶压缩和特征分析进行了分析比较;通过建立故障检测模型,找出故障特征矩阵,进而确定测试矩阵;在得出响应矩阵之后,采用两种方法分别进行压缩处理;从硬件开销、故障覆盖率、混淆率和压缩率四个方面出发,对两种方法的性能指标进行理论分析与计算;结果表明,不彻底的奇偶压缩适用于要求测试混淆率比较低的情况,特征分析适用于要求硬件开销较少、检测率较高、压缩效率较高的情况。

Test response compression is the most effective way to deal with the large amount of data produced by the AMU failure testing. How to choose an effect compression method is a key issue in AMU failure testing. The two most commonly used compression methods, the parity compression and the signature analysis, are analyzed and compared in this paper. By establishing the fault detection model, find the fault character matrix, identify the test matrix and obtain the response matrix, the two methods are compared to compress the data separately. With the four measures of hardware overhead, fault detection rate, allasing error probability and compression rate to analyze and calculate performance index of the two methods. The result shows that the halfway parity compression applies to the situation of the low aliasing error probability and in the situation of the low hardware overhead, the high fault detection rate and the high compression rate, the signature analysis can be used.