| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely extract a target track while reducing a time for processing. <P>SOLUTION: A track candidate generation part 140 fixes some of parameters for describing target tracks and then generates many parameter candidates. A correlation gate setting part 150 sets a correlation gate which maximally considers difference between some of the fixed parameters in the parameter candidates generated by the track candidate generation part 140 and a true target parameter. An overview search part 160 computes likelihood of a parameter candidate by using the correlation gate set by the correlation gate setting part 150 according to the parameter candidate generated by the track candidate generation part 140 and observation data taken by an observation data management part 130, and extracts a parameter candidate where the likelihood becomes maximum. A detailed search part 170 updates a parameter so that the likelihood becomes large with the parameter candidate extracted by the overview search part 160 as an initial value, updates it so that a correlation gate becomes small, and search for a parameter where the likelihood becomes maximum. <P>COPYRIGHT: (C)2012,JPO&INPIT |
