| 摘要 |
PROBLEM TO BE SOLVED: To provide a GPS receiver judging whether received signals are direct waves or reflected waves via multiple paths and capable of making a position measuring calculation by using only GPS satellites judged to receive the direct waves. SOLUTION: A second antenna control means directs a second antenna having directivity toward a plurality of GPS satellites acquired by a first antenna, and whether a GPS signal is received from the second antenna or not is confirmed on individual GPS satellites. When the signal is received from the second antenna, the signal is judged as direct waves. When the signal cannot be received from the second antenna, the signal is judged as reflected waves via multiple paths. An arithmetic means makes a position measuring calculation by using only GPS satellites judged to receive the direct waves. |
