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图象制导是现代导弹制导的发展趋向。跟踪模式目前在导弹制导中主要应用形心跟踪和相关跟踪两类。对于中远程导弹中段,适用的图象制导模式为互相关跟踪一图象匹配。对空空弹、空地弹、反坦克弹以及中远程导弹末段等,往往需要采用多模跟踪方式。从目标象大小、发射瞬变及扰动、设备复杂程度及成本等方面考虑,最好的模式是:图象匹配(自动识别)跟踪-形心跟踪-帧、帧相关跟踪。相关跟踪算法 SSDA算法可大大节省计算量,其关键是选取合适的门限。我们为了进一步减少计算量,提出了一种改进算法:先找配准点所在的大致区域,再在确定的大致范围内按SSDA算法搜索配准点。这种改进算法对图象相关矩阵没有次峰的情况完全正确,对存在次峰的复杂情况有时会造成失误。
Image guidance is the development trend of modern missile guidance. Tracking mode At present, the main application of heart tracking and related tracking two types of missile guidance. For mid-to-long range missiles, the applicable image guidance mode is cross-correlation tracking-image matching. Air-to-air bombs, open-air bombs, anti-tank bombs and long-range missile end segments often require the use of multi-mode tracking. In terms of target image size, launch transients and disturbances, equipment complexity and cost, the best modes are image matching (automatic recognition) tracking - centroid tracking - frames and frame correlation tracking. Correlation tracking algorithm SSDA algorithm can greatly reduce the computational burden, the key is to select the appropriate threshold. In order to further reduce the computational complexity, we propose an improved algorithm: find the approximate area where the registration points are located, and search the registration points according to the SSDA algorithm within a certain approximate range. This improved algorithm is completely correct in the case of no secondary peak in the image correlation matrix, which sometimes causes errors in the presence of secondary peaks.