| 摘要 |
PROBLEM TO BE SOLVED: To prevent positioning accuracy from getting worse in GPS positioning applied to a high-speed flying body or the like, when initially capturing satellites and when changing the combination of the satellites. SOLUTION: In the case signals of respective satellites have C/N values smaller than a previously set value, relative positioning is carried out without using pseudoranges of corresponding satellites (SA1-SA5). In the case a pseudorange correction value or a clock correction value which corrects a pseudorange error due to a receiver clock error, or each rate of changes in their correction values is larger than a previously set value, such a determination is made that the accuracy of the relative positioning is bad, and results of the relative positioning are not outputted outside (SA6-SA7). Meanwhile, in the case the pseudorange correction value or the clock correction value which corrects the pseudorange error due to the receiver clock error, or each rate of changes in their correction values is not more than the previously set value, the results of the relative positioning are outputted outside, and inaccurate results of positioning at the initial positioning time are not outputted outside. COPYRIGHT: (C)2005,JPO&NCIPI |
