改进的S模式纠错算法

对检测到错误的S模式应答信号报文纠错，传统的方法是查表法，不仅效率很低，而 且要求很大的存储空间存放错误图样，不适合工程应用。通过对S模式应答信号的干扰情况 、编译码方式及循环码特性的深入研究，提出了余数计算的改进方法；再结合使用码元置信 度，实现了能快速、准确定位误码并纠正它们的算法。改进的纠错算法不仅效率高，而且占 用系统资源少，易于硬件实现，其有效性已得到工程应用的验证。

An improved algorithm for Mode S error correction

To correct the Mode S reply message when the error is detected,the table lookup is a traditional method. But it has very low efficiency,and plenty of space is needed to store error patterns. This method is not suitable for the e ngineering application. Through intensively studying the interference condition s, coding of Mode S reply and the characteristic of cyclic code,an improved meth od of calculating remainder is presented. As a result,an algorithm is realized with which error codes can be located quickly and accurately by using the code c onfidence, and then be corrected. The improved algorithm not only has very high effi ciency, but also takes up less system resources, and can be implemented easily i n hardware. The effectiveness of improved algorithm has been verified in the eng ineering application.