Method and an apparatus for distance measurement
First Claim
1. A method for distance measurement by determining the pulse transit time, in which pulsed electromagnetic radiation (13) is transmitted using at least one transmitter (11) and signal pulses (17) reflected at objects (15) are detected using at least one receiver (19), wherein at least one received logic signal (27) containing logic signals (25) is generated from the received analog signal (21) containing the signal pulses (17), in particular by means of a threshold circuit (23), and is evaluated with respect to the transit times of the logic signals (25), characterized in that the received logic signal (27) is read into a programmable logic circuit (31) by means of a clocked data reading device and is mapped onto a time pattern in the logic circuit (31), in that instantaneous values of the received logic signal (27) are, stored in logic units of the logic circuit (31) associated with the time windows for windows of the time pattern corresponding to at least one clock pulse of the data reading device.
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Abstract
The invention relates to a method for distance measurement by determining the pulse transit time, in which pulsed electromagnetic radiation is transmitted using at least one transmitter and signal pulses reflected at objects are detected using at least one receiver, wherein at least one received logic signal containing logic signals is generated from the received analog signal containing the signal pulses, in particular by means of a threshold circuit, and is evaluated with respect to the transit times of the logic signals, and wherein the received logic signal is read into a programmable logic circuit by means of a clocked data reading device and is mapped onto a time pattern in the logic circuit, in that instantaneous values of the received logic signal are stored in logic units of the logic circuit associated with the time windows for time windows of the time pattern corresponding to at least one clock pulse of the data reading device. The invention moreover relates to an apparatus for distance measurement.
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Citations
26 Claims
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1. A method for distance measurement by determining the pulse transit time, in which pulsed electromagnetic radiation (13) is transmitted using at least one transmitter (11) and signal pulses (17) reflected at objects (15) are detected using at least one receiver (19), wherein at least one received logic signal (27) containing logic signals (25) is generated from the received analog signal (21) containing the signal pulses (17), in particular by means of a threshold circuit (23), and is evaluated with respect to the transit times of the logic signals (25),
characterized in that the received logic signal (27) is read into a programmable logic circuit (31) by means of a clocked data reading device and is mapped onto a time pattern in the logic circuit (31), in that instantaneous values of the received logic signal (27) are, stored in logic units of the logic circuit (31) associated with the time windows for windows of the time pattern corresponding to at least one clock pulse of the data reading device.
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19. Use of a programmable correction function of a logic circuit (31), in particular of an FPGA, which is provided for the time correction of input signals with respect to a base clock,
for the generation of a plurality of signals from a received logic signal (27) which are phase-shifted with respect to one another.
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21. An apparatus for distance measurement by determining the pulse transit time comprising at least one transmitter (11) for the transmission of pulsed electromagnetic radiation (13) and at least one receiver (19) for the detection of signal pulses (17) reflected at objects (15), wherein a conversion device (23), in particular a threshold circuit, is positioned downstream of the receiver (19) with which at least one received logic signal (27) containing logic signals (25) can be generated from the received analog signal (21) containing the signal pulses (17),
characterized in that a measurement device having a clocked data reading device and a programmable logic circuit (31) is positioned downstream of the conversion device (23), with the received logic signal (27) read in by means of the data reading device being able to be mapped onto a plurality of logic units of the logic circuit (31), and wherein instantaneous values of the received logic signal (27) can be stored in the logic units of the logic circuit (31) associated with the time windows for times windows of the time pattern corresponding to at least one clock pulse of the data reading device.
Specification