Distance measuring equipment

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:

• 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.

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.

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.

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:

• 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.