Distance measuring equipment
First Claim
1. A distance measuring equipment, in which an interrogation pulse is transmitted from an interrogator and a reply pulse is transmitted from a transponder in response to said interrogation pulse, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said reply pulse, the distance between said interrogator and said transponder can be measured, said interrogator comprising:
- a pulse generator for generating said interrogation pulse having at least the leading edge approximately expressed by the formula of ##EQU9## where E and F represent finite positive numbers and T represents time, and means for detecting said timing position of said reply pulse, said timing position being selected in the proximity of an inflection point of said reply pulse,and said transponder comprising;
a pulse generator for generating said reply pulse, andmeans for detecting said timing position of said interrogation pulse, said timing position being selected in the proximity of an inflection point of said interrogation pulse.
1 Assignment
0 Petitions
Accused Products
Abstract
In a distance measuring equipment for measuring the distance between an interrogator and a transponder with high precision by detecting the time from transmission of an interrogation pulse from the interrogator to reception of a reply pulse transmitted from the transponder on the basis of timing positions of said respective pulses; as leading edges of the interrogation pulse and reply pulse, a waveform represented by the formula of: ##EQU1## where E and F represent finite positive values and T represents time, is used, or else as a leading edge of the interrogation pulse, a waveform which can be approximated by the above formula is used, while as a leading edge of the reply pulse, a waveform obtained by passing a waveform approximately expressed by the formula of: ##EQU2## through a low-pass filter having a predetermined cut-off frequency, is used.
68 Citations
13 Claims
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1. A distance measuring equipment, in which an interrogation pulse is transmitted from an interrogator and a reply pulse is transmitted from a transponder in response to said interrogation pulse, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said reply pulse, the distance between said interrogator and said transponder can be measured, said interrogator comprising:
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a pulse generator for generating said interrogation pulse having at least the leading edge approximately expressed by the formula of ##EQU9## where E and F represent finite positive numbers and T represents time, and means for detecting said timing position of said reply pulse, said timing position being selected in the proximity of an inflection point of said reply pulse, and said transponder comprising; a pulse generator for generating said reply pulse, and means for detecting said timing position of said interrogation pulse, said timing position being selected in the proximity of an inflection point of said interrogation pulse. - View Dependent Claims (7, 8, 9, 10, 13)
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2. A distance measuring equipment, in which an interrogation pulse is transmitted from an interrogator and a reply pulse is transmitted from a transponder in response to said interrogation pulse, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said replay pulse, the distance between said interrogator and said transponder can be measured, said interrogator comprising:
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a pulse generator for generating said interrogation pulse having at least the leading edge approximately expressed by the formula of ##EQU10## where E and F represent finite positive numbers and T represents time, and means for detecting said timing position of said reply pulse, said timing position being selected in the proximity of a predetermined rising portion of said reply pulse; and said transponder comprising; a pulse generator for generating said reply pulse obtained by passing a pulse approximately expressed by the formula of ##EQU11## through a low-pass filter having a predetermined cut-off frequency and means for detecting said timing position of said interrogation pulse, said timing position being selected in the proximity of an inflection point of said interrogation pulse. - View Dependent Claims (3, 4)
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5. A distance measuring equipment for use in a system in which an interrogation pulse is transmitted from said equipment and a reply pulse is transmitted from transponder in response to said interrogation pulse received, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said reply pulse, the distance between said equipment and said transponder is measured, said equipment comprising:
a pulse generator for generating said interrogation pulse having at least the leading edge approximately expressed by the formula of ##STR1## where E and F represent finite positive numbers and T represents time; and
means for detecting said timing position of said reply pulse received.
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6. A distance measuring equipment for use in a system in which an interrogation pulse is transmitted from an interrogator and a reply pulse is transmitted from said equipment in response to said interrogation pulse, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said reply pulse, the distance between said interrogator and said transponder is measured, said equipment comprising:
a pulse generator for generating said reply pulse having at least the leading edge approximately expressed by the formula of ##EQU12## where E and F represent finite positive number and T represents time, and means for detecting said timing position of said interrogation pulse.
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11. A distance measuring equipment for use in a system in which an interrogation pulse is transmitted from an interrogator and a reply pulse is transmitted from said equipment in response to said interrogation pulse received, and by measuring the time from the transmission of said interrogation pulse to the reception of said reply pulse on the basis of the timing positions of said interrogation pulse and said reply pulse, the distance between said interrogator and said transponder is measured, said equipment comprising:
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a pulse generator for generating a pulse approximately expressed by the formula of ##EQU13## means coupled to said pulse generator for obtaining said reply pulse by passing the output pulse of said pulse generator through a low-pass filter having a predetermined cut-off frequency, and means for detecting said timing position of said interrogation pulse received. - View Dependent Claims (12)
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Specification