| 摘要 |
PURPOSE:To realize the use of the position line information with high accuracy, by calculating an extent of shift based on an intersection of two pieces of position line information and when one of the two position lines is shifted by a unit time and then comparing the extent of shift with an allowable range. CONSTITUTION:The outputs of receivers 1 and 2 of lorans A and C are converted into a data which is based on the Besselian coordinates through a latitude/longitude converting circuit 5 to obtain the latitude and longitude of the intersection of two position lines. Then an extent of shift is obtained from D1 and theta1 when the L1 of the two position lines is fixed with the other line L1 shifted by a unit time respectively. This extent of shift is calculated by a computer incorporated into the circuit 5 and then compared with an allowable range which is previously set to decide the accuracy for a display 7 or alarm 8. In such way, an operator can change the position line now at use into an optimum one with high accuracy. |
