APPARATUS FOR MEASURING UNIDIRECTIONAL DISTANCE

摘要

PURPOSE:To calculate a real distance with high accuracy, by a method wherein the change to the time of a distance to be measured generated by the frequency difference of two reference signal sources in a stationary state and the difference of the distance to be measured and an actual distance generated by phase difference are calculated and the distance measured corresponding to the calculated value is corrected. CONSTITUTION:The increment amount L0(m) of a distance to be measured until a time T0(sec) is elapsed from an initial state 0 is measured in a stationary state by a time- distance converter and the constant gradient K=L0/T0 of the increment is calculated to be stored in a distance correction device. The measuring error L1(m) based on the phase difference of a distance measurement start point and a point where T1(sec) is elapsed from the initial state is calculated as the difference of the distance S0(m) between a transmission point and a receiving point and the distance S1(m) measured by the time-distance converter to be stored in the distance correction device. The actual distance M0(m) at the point where (T-T1)(sec) is elapsed from the distance measurement start point T1 is obtained by a method wherein the above mentioned L1(m) is added to the measured distance M1(m) at that time and the measuring error L(m) based on the above mentioned frequency difference is further subtracted from the sum value.