Fig. 1. Infrared camera signal flow diagram

Fig. 2. Logic diagram of multi-tap readout

Fig. 3. “Split point” target formation process

Fig. 4. “Split point” target

Fig. 5. Track tree generating weighted undirected graph，（a）multi-hypothesis track tree and N-scan backtracking pruning，（b）weighted undirected graph

Fig. 6. “ Split point ” degradation model

Fig. 7. Flow chart of iterative model correction in energy dimension

Fig. 8. MHT tracking “split point” target results，（a）tracking results for horizontal motion scene，（b）tracking results for vertical motion scene

Fig. 9. Comparison of tracking results of three algorithms，（a）GNN tracking results，（b）JPDA tracking results，（c）MHT tracking results，（d）the true trajectory of each observation of ' splitting point '

Fig. 10. Centroid correction results of “split point” target, (a) ideal centroid and corrected centroid of horizontal moving target, (b) correction centroid error of horizontal moving target, (c) ideal centroid and corrected centroid of vertical moving target, (d) correction centroid error of vertical moving target