초록 ▼

Method and apparatus for measuring the velocity of an object relative to a reference by means of signals that are transmitted and received by transmitters and receivers fixed to the object at a certain geometric distance from each other in the direction of measurement, signals being transmitted by t

Method and apparatus for measuring the velocity of an object relative to a reference by means of signals that are transmitted and received by transmitters and receivers fixed to the object at a certain geometric distance from each other in the direction of measurement, signals being transmitted by the object and being reflected by the reference. The receivers set up signals which correspond to the auto-correlation and cross-correlation of the received signals, the correlation signals being functions of the transmitter-receiver system geometry and being substantially independent of the reflection properties of the reference. The auto-correlation and cross-correlation signals are operated on to determine a time shift therebetween which is a function of the displacement of the object over a given period of time, the velocity of the object relative to the reference location being determined from said time shift.

대표청구항 ▼

Apparatus for measuring the velocity (v) of an object relative to a reference, comprising: at least one transmitter at said object for transmitting a signal to a reference; at least two receivers and associated aerials at said object for receiving the signals reflected by said reference, said receiv

Apparatus for measuring the velocity (v) of an object relative to a reference, comprising: at least one transmitter at said object for transmitting a signal to a reference; at least two receivers and associated aerials at said object for receiving the signals reflected by said reference, said receivers being attached to said object at a given geometric distance (lo) from each other in the measuring direction, said signals being transmitted by said transmitter within a lobe area that is substantially common to the at least two receiving aerials which are coupled to said receivers; means coupled to said transmitter and receivers for transforming the signals transmitted by said object and those reflected by said reference and received by said object into similar signals but with a time shift (to) between them, the size of said time shift (to) being a function of said geometric distance (lo) between said receivers and on the velocity (v) of the object relative to said reference in accordance with the relation lo = v ㆍ to, the resultant signals generated by said transforming means being stochastic functions of signals reflected by said reference with respect to the geometric displacement of said object relative to said reference; correlation means coupled to said transforming means for generating signals (A11, A22 and A12, A21) corresponding to the auto- and cross-correlations of the signals received by said receivers, said correlation signals being a function of the geometry of the transmitter-receiver system and of the signal processing and being substantially independent of the reflection properties of said reference, said auto- and cross-correlations of the signals having substantially identical shape yet with a displacement (lo) of the cross-correlation signals (A12, A21) relative to the auto-correlation signals (A11, A22), one of the cross-correlation signals being displaced in the positive direction of measurement, and the other signal in the negative direction of measurement; means coupled to said correlation means for measuring the ratio of the auto- and cross-correlations for a certain time shift (tttl, where - lo o) corresponding to said time shift; and means coupled to said interpolation means for measuring the velocity (v) of said object relative to said reference in accordance with the relation v =l/t