| 摘要 |
PROBLEM TO BE SOLVED: To allow a precise azimuthθto be measured even when mounted on a small device such as a portable device, and to eliminate a wait time up to determination of ambiguity. SOLUTION: A double phase difference change rateδ, a unit vector S in a sight-line direction watching each satellite from antennas 1, 2, and an incrementΔS per a fixed time of the unit vector S are found in a calculation part 9 based on outputs of GPS reception parts 11, 12, and the azimuthθis calculated based on theδ, the S, theΔS, an angular velocity rθof a gyro 3, a wave lengthλof a received radio wave, and a distance R between the antennas 1, 2. The azimuthθis measured highly precisely because the angular velocity rθof the gyro 3 has high precision, and because the other fluctuation data are acquired from the GPS reception parts 11, 12. The wait time up to the determination of the integer value bias (ambiguity) is not required because the integer value bias (constant value) is erased in computation of the double phase difference change rate.
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