说明：  从高噪下提取微弱信号是工程中在信号预处理中很重要的一个分支。故该课题要求同学在分析弱信号的特点基础上，研究不同算法在弱信号检测上的优缺点
(Extract weak signals from noisy signal preprocessing engineering in a very important branch. Therefore, the subject requires students to analyze the characteristics of a weak signal on the basis of research on the advantages and disadvantages of different algorithms to detect the weak signal)