| 摘要 |
PURPOSE:To constitute the title system so that communication and a position measurement can be executed in all areas on the earth by transmitting a position measuring signal so as to reach simultaneously plural communication satellites, executing the position measurement with regard to each of receiving position measuring signals of a prescribed frequency portion, and as a result, adopting a coincidence value as a position measured value. CONSTITUTION:The delay quantity outputted to timing controllers 9-1 - 9-3 from time difference detecting devices 8-1 - 8-3, and the one-way propagation time extending from a base station to communication satellites 2-1 - 2-3 are denoted as Ci (i=1-3) and Ti (i=1-3), respectively. As a result, measured values Di (i=1-3) by the time difference detecting devices 8-1 - 8-3 become Di=Ci+2Ti. Therefore, in the case of T0=Ci+ Ti and Ci=2T0-Di, three position measuring signals transmitted from the base station reach each communication satellite simultaneously, that is, after T0 second from the time when they have been generated by a signal generator 10, and radiated simultaneously from each communication satellite. Accordingly, a moving body 11 detects an arrival time difference of the position measuring signals arriving from each communication satellite and can measure its own geographical position by using a method of a trigonometrical position measurement. |
