GPS RECEIVER

摘要

PROBLEM TO BE SOLVED: To make a decision whether positioning is normal or not even if initial positioning results after turning on power deviate significantly from previous positioning results before turning off power by providing a mobile range frame dependent on the interruption time of power supply. SOLUTION: A mobile range frame dependent on the previous positioning and the interruption time of power supply is set. Positioning results immediately before interrupting power supply of a receiver is stored in the memory at an abnormal position detecting section 7 and utilized. Positioning results calculated at a positioning operating section 5 after turn on power are delivered to the abnormal position detecting section 7 and checked against the mobile range frame from a stored previous positioning before turn off power. If the positioning results falls in the mobile range frame, a decision is made that the positional data is normal otherwise abnormality of positional data is notified to a receive control operating section 6 and positioning satellites are searched again.