Distance measurement
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Abstract
The invention relates to a method for measuring distance wherein pulsed electromagnetic radiation is emitted by at least one transmitter and the reflected signal impulses are detected by at least one receiver. According to the invention, the distances of the objects, at which the emitted radiation impulses are reflected, is measured by determining the propagation time of the impulses. The noise is measured by a receiver and moments in time during which a noise threshold of the receiver is exceeded, are determined, and modifications of the noise produced by the signal impulses are detected by the communicating of a plurality of individual measurements respectively comprising said moments in time.
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Citations
62 Claims
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1-32. -32. (canceled)
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33. A method of distance measurement, comprising:
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transmitting pulsed electromagnetic radiation (13) using at least one transmitter (11);
detecting reflected signal pulses (15) using at least one receiver (17);
measuring distances from objects (19) at which the transmitted radiation pulses (13) are reflected by determining a pulse propagation time;
measuring noise using the receiver (17) with specific points in time (33) being determined at which at least one threshold (21) of the receiver (17) lying in the noise is passed through and with changes in the noise caused by the signal pulses (15) being detected by averaging a plurality of individual measurements respectively including the specific points in time (33). - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. An apparatus for distance measurement by determination of the pulse propagation time, comprising:
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at least one transmitter (11) for the transmission of pulsed electromagnetic radiation (13); and
at least one receiver (17) for the detection of reflected signal pulses (15), wherein the receiver (17) comprises an amplifier (35) for the generation of an analog received signal (37) and a device (39) having at least one threshold (21) lying in the noise with which a sequence of logical pulses (23) can be generated from the analog received signal (37); and
wherein an evaluation device (41) is associated with the receiver (17) with which a respective individual measurement can be generated for a plurality of transmitted radiation pulses (13) from points in time (33) which correspond to the flanks of the logical pulses (23) and an averaging of the individual measurements respectively including the determined points in time (33) can be carried out for the detection of changes in the noise which are caused by the signal pulses (15). - View Dependent Claims (56, 57, 58, 59, 60, 61, 62)
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Specification