Process and system for measuring the distance of a moving body from a fixed part
First Claim
1. A process for measuring the distance of a moving body (12) from a fixed part (10), characterized in that it comprises the steps of:
- generating a first alternating signal (r(t)) having a frequency within the radio-wave range or the elastic-wave range;
emitting the first signal from the fixed part towards the moving body (12);
receiving the first signal (r(t)) on the moving body (12) and generating, on the moving body (12), a second signal (s(t)) having a frequency (nf) equal to the frequency of the first signal (r(t)) multiplied by a constant factor (n), the second signal (s(t)) having an initial phase (ψ
1) equal to the phase (2π
ft1+ψ
0) at the instant (t1 ) in which it is received by the moving body (12);
generating, on the fixed part, a third signal (u(t)) having a frequency (nf) equal to the frequency of the second signal (s(t)) and an initial phase (ψ
0) equal to the initial phase of the first signal (r(t)); and
determining the variation in distance of the moving body (12) in a pre-set time interval as a function of the variation in the amplitude of an alternating signal obtained from the sum of the second signal (s(t)) and the third signal (u(t)) in the same time interval.
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Abstract
A process for measuring the distance of a moving body (12) from a fixed part (10), characterized in that it comprises the steps of:
generating a first alternating signal (r(t)) having a frequency within the radio-wave range or of elastic-wave range;
emitting the first signal from the fixed part towards the moving body (12);
receiving the first signal (r(t)) on the moving body (12) and generating, on the moving body (12), a second signal (s(t)) having a frequency (nf) equal to the frequency (f) of the first signal (r(t)) multiplied by a constant factor (n), the second signal (s(t)) having an initial phase (ψ1) equal to the phase (2πft1+ψ0) at the instant (t1) in which it is received by the moving body (12);
generating, on the fixed part, a third signal (u(t)) having a frequency (nf) equal to the frequency of the second signal (s(t)) and an initial phase (ψ0) equal to the initial phase of the first signal (r(t)); and
determining the variation in distance of the moving body (12) in a pre-set time interval as a function of the variation in the amplitude of an alternating signal obtained from the sum of the second signal (s(t)) and the third signal (u(t)) in the same time interval.
2 Citations
6 Claims
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1. A process for measuring the distance of a moving body (12) from a fixed part (10), characterized in that it comprises the steps of:
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generating a first alternating signal (r(t)) having a frequency within the radio-wave range or the elastic-wave range;
emitting the first signal from the fixed part towards the moving body (12);
receiving the first signal (r(t)) on the moving body (12) and generating, on the moving body (12), a second signal (s(t)) having a frequency (nf) equal to the frequency of the first signal (r(t)) multiplied by a constant factor (n), the second signal (s(t)) having an initial phase (ψ
1) equal to the phase (2π
ft1+ψ
0) at the instant (t1 ) in which it is received by the moving body (12);
generating, on the fixed part, a third signal (u(t)) having a frequency (nf) equal to the frequency of the second signal (s(t)) and an initial phase (ψ
0) equal to the initial phase of the first signal (r(t)); and
determining the variation in distance of the moving body (12) in a pre-set time interval as a function of the variation in the amplitude of an alternating signal obtained from the sum of the second signal (s(t)) and the third signal (u(t)) in the same time interval. - View Dependent Claims (2, 3, 4, 5)
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6. A system for measuring the distance of a moving body (12) from a fixed part (10), characterized in that it comprises:
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a generator (16) of a signal having a frequency within the radio-wave range or the elastic-wave range;
a transmitter (14) for emitting a first signal (r(t)) towards a moving body (12);
means set on the moving body (12) which are designed to multiply the frequency of the signal received and to emit a second signal (s(t)) towards the fixed part (10);
receiver means (24, 24′
, 24″
) for receiving the second signal (s(t)); and
means designed to supply an electric signal having an amplitude correlated to the difference correlated to the phase difference between the first signal (r(t)) and the second signal (s(t)).
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Specification