中文摘要：

匹配场处理是一种水声学和物理学相结合的信号处理技术,其在水下目标定位方面的高精度特点使得该方法受到广泛关注。匹配模处理是工作在模态空间的匹配处理方法。相对于匹配场处理方法,匹配模处理方法通过选取受环境失配影响较小的模态参与匹配处理（然而匹配场处理方法使用了全部声场数据）,减小环境失配对定位性能的影响。本文研究了简正波模型下的匹配模处理器,讨论了环境失配时匹配模处理器的性能,通过选取受失配影响较小的模态组合,得出的定位结果更加精确。

英文摘要：

Matched-field processing is a signal processing technology which combines underwater acoustics and physics. Its high accuracy in underwater target location makes this method attract wide attention. Matched- mode processing is a matching approach working in mode space. Contrary to matched-field processing, matchedmode processing select the mode which is less affect by the environmental mismatch（whereas matched-field processing uses the entire pressure field）, which reduces its sensitivity to environmental mismatches. In this paper, matched-mode processor of normal mode has been studied. The performance of the matched-mode processor is discussed and by selecting the modal combination less affected by the environmental mismatch, more accurate positioning results can be obtained.