| 摘要 |
PROBLEM TO BE SOLVED: To measure delay time in a base station, which transmits a signal to a mobile terminal, in synchronization with the GPS system time. SOLUTION: In order to calculate the delay time in the base station as a measuring object, a dummy base station 100 and a mobile apparatus 200 are used. The station 100 comprises a GPS receiver simulator 101 and a base-station simulator 102. The simulator 102 transmits a signal synchronized with the GPS system time from the simulator 101; the mobile apparatus 200 receives signals transmitted from the base station as the measuring object and the station 100 and finds the time difference between both, on the basis of the reception timing of the signal transmitted from the station 100 and on the basis of the reception timing of the signal transmitted from the base station as the measurement object; the propagation time of the signal between the base station as the measuring object, and the mobile apparatus 200 is subtracted from the time difference; and the delay time in the base station as the measuring object is calculated. |
