| 摘要 |
PURPOSE:To reduce practically data value groups and to improve the measurement precision by changing the correction value deriving method, where the correction value of an error obtained by actual measurement is stored as a data value group, at intervals of a specific frequency and at every specific direction angle. CONSTITUTION:A correction value calculating circuit 3 reads out a frequency stored in a data storage circuit 2 by a frequency signal (a) and reads out a direction angle stored in the circuit 2 by a measured azimuth signal (b) to output a read signal (c) and calculating the correction value in accordance with proportional allotment calculation while receiving correction data signal (d) and outputs the correction value as a correction signal (e). An azimuth correcting circuit 4 adds the value of the correction signal (e) to the value of the measured azimuth signal (b) and outputs the result as a corrected azimuth signal (f). A display circuit 5 displays the direction in accordance with the value of the corrected direction signal (f). For instance, correction values are operated at intervals of 10 deg. of measured azimuth and are stored in the data value storage circuit 2 as data values G01-G36 in the conventional method; but in such a constitution, the quantity of data is reduced as the whole and high-precision azimuth correction is performed effectively because corrected values at break points are stored in the data value storage circuit as data values G101-G108. |
