| 摘要 |
PROBLEM TO BE SOLVED: To provide an earth magnetism azimuth sensor wherein magnetic azimuth is automatically corrected to obtain a true azimuth even when latitude and longitude of a point which is to be measured is unknown. SOLUTION: An earth magnetism sensor 1, a tilt sensor 2, a corrective calculation part 32 wherein a tilt of magnetic output is corrected to be horizontal with altitude angle with inputted magnetic output detected by the earth magnetism sensor 1 and altitude angle detected by the tilt sensor 2, an azimuth calculation part 33 wherein a calculation result of the corrective calculation part 32 is inputted to calculate magnetic azimuthψ, an antenna 4 which receives GPS signal transmitted from a GPS satellite, and a GPS receiver 5 wherein the GPS signal is inputted for outputting latitude/longitude information, are provided. Here, a deviation-angle calculation part 34 wherein the latitude/longitude information is inputted to calculate an angle of deviationδψ, and an adder part 35 wherein the magnetic azimuthψand the angle of deviationδψare added together for outputting corrected through azimuthψ' are comprised.
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