| 摘要 |
PROBLEM TO BE SOLVED: To provide a GPS device with monitoring means capable of increasing the precision of GPS, providing high reliability, and being mounted on a vehicle. SOLUTION: This GPS device consists of a plurality of GPS receivers 2, 4 having antennae 1, 3 provided in a vehicle 7, a monitoring device 5, and an output device 6. The monitoring device 5 compares a part or all of opposing positioning information outputted by each GPS receiver 2, 4, judges whether respective positioning information is within a scope of mutual relation assumed from installation position relation of each antenna 1, 3 or not, and detects that specific or unspecified GPS receiver is in an abnormal condition when the information is out of the scope as a result of the judgement. |
