Position indicating system

摘要

In the position indicating system, a user's position is calculated in a user station (N) from the distances to several parent television transmitters (S1, S2) and/or fill-in television transmitters (FS11, ..., FS21,...) and the positions of these television transmitters which are known in the user station. The distances to the television transmitters are determined by means of one-way range measurements. The time markers needed for one-way range measurement are derived from the television signals of these television transmitters. The television transmitter which has radiated the television signal is identified with the aid of the frequency of the received television signal. To synchronise all stations of the system, a ground control station (K) is provided which operates in conjunction with a transponder (T) arranged on a satellite. The transponder signals are also received by receiving stations (E) which are allocated to the parent television transmitters (S). In the receiving stations, correction values are determined for the parent television transmitters and these are transmitted to the users. The fill-in transmitters are in each case coupled to the associated parent television transmitter. <IMAGE>