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 (φ
1) equal to the phase (2π
ft1+φ
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 (φ
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 and a system for measuring the distance of a moving body (12) from a fixed part (10), characterized the steps of: generating a first alternating signal (r(t)) having a frequency within the radio-wave range or 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 (φ1) equal to the phase (2πft1+φ) 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 (φ0) 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 formation 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.
39 Citations
10 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 (φ
1) equal to the phase (2π
ft1+φ
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 (φ
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, 6, 7, 8, 9)
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10. 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