| 摘要 |
PCT No. PCT/JP93/01714 Sec. 371 Date Feb. 9, 1995 Sec. 102(e) Date Feb. 9, 1995 PCT Filed Nov. 24, 1993 PCT Pub. No. WO94/19704 PCT Pub. Date Sep. 1, 1994A travel velocity detector is installed in a mobile telephone station such as a portable telephone or a car telephone. The travel velocity detector adapts a received power level to a travel velocity of the mobile station. Two receiving circuits receive communication waves via respective antennas and output respective power levels E1 and E2 therefrom. The detected powers E1 and E2 are compared with each other to determine which of the powers is greater. A variation of the comparison result is then detected. The number of detected variations, corresponding to a switching frequency, is then counted during a preset time period. A relative travel velocity between the mobile station and an opposite transmitting station is estimated on the basis of the number of the counted variations.
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