公开(公告)号：US11061143B2

公开(公告)日：2021-07-13

申请号：US16087218

申请日：2017-03-17

申请人： NEC Corporation

发明人： Hiroshi Soga ,  Yoshimi Ohshima ,  Tomoya Osawa ,  Aki Taniyama ,  Aki Sakamoto

IPC分类号： G01S19/25 ,  G01S19/23 ,  G01S19/28 ,  G01C21/28

摘要： In a satellite navigation system a navigation terminal continuously receives navigation signals from navigation satellites and continuously implements navigation calculations, thereby obtaining navigation calculation results, and executes in parallel: using clock offset values determined through the navigation calculations, calculates, in real time, changes in difference between time differences with regard to difference between time differences, which are differences between a clock offset value and a standard deviation value, which is the value of the standard deviation of fluctuation amounts of the clock offset values; determines, in real time, two navigation precision indices of the calculated navigation calculation results on the basis of each change in the calculated difference between time differences and standard deviation value; associates, in real time, the determined two navigation precision indices with the calculated navigation calculation results; and outputs, in real time, the navigation calculation results associated with the at least two navigation precision indices.