CAJ | 학술논문

匹配追踪(MP)的主要策略是通过每次迭代时选择一个局部最优解，从而逐步逼近原始信号。然而传统的MP系列算法进行原子匹配时，各类原子集间存在交集，从而影响了原子的表示能力以及相应的分类效果。基于此，该文提出一种适用于信号监督分类的匹配追踪新算法。其原子挑选的准则为：同类信号采用相同的原子集匹配，获取相同的类内表示结构；异类信号选择不同的原子集匹配，从而增强信号的类间差异。示例分析表明，使原子集间相互独立，能够减少异类信号间的共性因素，强化信号间的区分度，从而有利于提升分类识别效果。通过在标准图像库和实测雷达辐射源信号集上的实验表明，较之传统的 MP 系列方法，所提算法对噪声和遮挡具有更强的鲁棒性。
필배추종(MP)적주요책략시통과매차질대시선택일개국부최우해，종이축보핍근원시신호。연이전통적MP계렬산법진행원자필배시，각류원자집간존재교집，종이영향료원자적표시능력이급상응적분류효과。기우차，해문제출일충괄용우신호감독분류적필배추종신산법。기원자도선적준칙위：동류신호채용상동적원자집필배，획취상동적류내표시결구；이류신호선택불동적원자집필배，종이증강신호적류간차이。시례분석표명，사원자집간상호독립，능구감소이류신호간적공성인소，강화신호간적구분도，종이유리우제승분류식별효과。통과재표준도상고화실측뢰체복사원신호집상적실험표명，교지전통적 MP 계렬방법，소제산법대조성화차당구유경강적로봉성。
The main idea of Matching Pursuit (MP) is to get a local optimal solution by iteration, so as to gradually approach the original signal. To cope with the intersection of different atom sets, which may affect the classification performance of conventional MP methods, a new matching pursuit algorithm is proposed, which is suitable for supervised classification. The criterion for atoms selection consists of two parts. On one hand, by using the same atom set within the class, the intra-class structure of the similar signals is obtained for class-representation;on the other hand, by selecting the atom sets independently for every class, the discrimination ability for different classes could be further strengthened. The analysis on a toy example indicates that this scheme reduces the common factors between different classes and highlights the discrimination between signals, which may boost the performance of signal classification. Finally, the experiments on benchmark image databases and the measured radar emitter signals verify that the proposed algorithm achieves better robustness against noise and occlusion, compared with the convention MP-related methods.