A method and apparatus for distance measurement is disclosed in which first and second signals having different propagation speeds are transmitted between a transmitter (2) at a first location and a receiver (3) at a second location. The distance between the first and second locations is determined from the difference in propagation time between the first and second signals.
申请公布号
WO9743661(A1)
申请公布日期
1997.11.20
申请号
WO1997GB01271
申请日期
1997.05.09
申请人
THE GUIDE DOGS FOR THE BLIND ASSOCIATION;BURRELL, CHRISTOPHER, SIMON