MOVING POSITION MEASURING INSTRUMENT,申请号JP19860103450-传众专利搜索

MOVING POSITION MEASURING INSTRUMENT

申请公布号：JPS62261013(A)

申请号：JP19860103450

申请日期：1986.05.06

申请公布日期：1987.11.13

申请人：

NISSAN MOTOR CO LTD

发明人：TAKAI HIDEO;UEKUSA YASUYUKI

分类号：G01C21/00

主分类号：G01C21/00

摘要：PURPOSE:To always accurately measure the present position of a vehicle by obtaining the movement quantity of sampling timing corresponding to that during a wave disappearance by using distances between a wave disappearing position or a signal restoring position and loran stations. CONSTITUTION:A calculated position from a calculated position selecting circuit 22 is normally delivered to a between-two-point distance calculating circuit 30 and, only when a tracking is enabled again, to another between-two-point distance calculating circuit 32. Using an absolute position that has been obtained just before a wave disappearance and the positions of loran stations that have been stored in a station position storage circuit 34 in advance, the circuit 30 obtains distances between the absolute position and the loran stations. Using a relative position obtained just before a wave restoration and the stored (34) positions of the loran stations, the circuit 32 obtains distances between the relative position and the loran stations. A sampling timing movement quantity calculating circuit 36 obtains differences between the circuits 30 and 32 for the respective loran stations and, on the basis of the differences, obtains the movement quantities of the sampling pulses of the tracking points of the loran stations from the wave disappearance to the wave restoration. The sampling pulses move to a normal tracking point based on a calculated movement quantity when a wave is restored.