The present invention pertains to a method for range measurement by means of a signal transmitted in the direction of an object to be measured, wherein an echo signal, on which is superimposed a first reference pulse, is received by a receive device, wherein the echo signal is compared with a second
The present invention pertains to a method for range measurement by means of a signal transmitted in the direction of an object to be measured, wherein an echo signal, on which is superimposed a first reference pulse, is received by a receive device, wherein the echo signal is compared with a second reference signal that features a second reference pulse for determining a signal travel time, and wherein a first comparison value of the echo signal and a second comparison value of the second reference signal are compared with each other for determining an amplitude offset between the echo signal and the second reference signal, and these values, in regards to time, are before the first and second reference pulses in a region of the echo signal curve and of the second reference signal curve, respectively, and in these regions, these curves feature a slope that is at least approximately zero.
대표청구항▼
1. Method for range measurement comprising: transmitting a signal in a direction of an object to be measured; receiving an echo signal comprising a first reference signal or a first reference pulse by a receiver device; determining a signal travel time by comparing the echo signal with a second
1. Method for range measurement comprising: transmitting a signal in a direction of an object to be measured; receiving an echo signal comprising a first reference signal or a first reference pulse by a receiver device; determining a signal travel time by comparing the echo signal with a second reference signal comprising a second reference pulse; determining an amplitude offset between the echo signal and the second reference signal, by comparing a first amplitude comparison value of the echo signal and a second amplitude comparison value of the second reference signal with each other, each measured at a same time before a time of the first and second reference pulses in regions of a curve of the echo signal and a curve of the second reference signal, respectively, in which the curves each exhibit a slope that is at least approximately zero. 2. Method according to claim 1, in which the first reference pulse is superimposed on the echo signal. 3. Method according to claim 1, in which a corresponding least upper bound of amplitudes of the first reference pulse and of the second reference pulse is determined and in which a corresponding amplitude value of the echo signal curve and of the second reference signal curve is used as the first and second amplitude comparison values, respectively, these values being at a certain time period before the respective least upper bound. 4. Method according to claim 3, in which, for determining the first and second comparison values, instead of the least upper bound of the first and second reference pulses, one of the corresponding amplitude values before the least upper bound is output, where this amplitude value equals a predetermined portion of the least upper bound of the first and second reference pulses. 5. Method according to claim 1, in which several first comparison values and several second comparison values are formed, and their average values are compared with each other for determining the offset. 6. Method according to claim 1, in which adjacent amplitude values before a least upper bound of the first reference pulse are compared with each other, wherein when the two adjacent values are no longer different, that value is used as the first comparison value; and in which adjacent amplitude values before a least upper bound of the second reference pulse are compared with each other, and when the two adjacent values are no longer different, that value is used as the second comparison value. 7. Device for range measurement comprising: a transmit and receive device for transmitting a signal and for receiving an echo signal comprising a first reference pulse or signal; a memory device for storing a second reference signal; an evaluation device for comparing the echo signal and the second reference signal; characterized in that for determining an amplitude offset between the echo signal and the second reference signal, the evaluation device further comprises: a first unit for determining a first comparison value at a same time before the first reference pulse of the echo signal, where this value is located in a signal region of a curve of the echo signal with a slope of zero; and a second unit for determining a second comparison value at the same time before a second reference pulse of the echo signal, where this value is located in a signal region of a curve of the second reference signal with a slope of zero. 8. Device according to claim 7, in which the transmit and receive device is designed such that the first reference signal is superimposed on the echo signal. 9. Method according to claim 1, in which a time position of a least upper bound of the first reference pulse and of the second reference pulse is calculated for determining a time offset between the echo signal and the second reference signal.
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이 특허에 인용된 특허 (4)
Woodward Steven J.,CAX ; Bednarchuk Thomas Mike,CAX, Echo detection in pulse-echo ranging systems.
Miskell, Thomas; Ki, George, Measuring of fluid in a vessel with two coaxial cable sections and a coupling therebetween using time domain reflectometry.
Miskell, Thomas J.; Tan, Zhenyu; Petriel, Kevin J.; Carvalho, Carlos E.; Lavon, Ronie, System and method for optimizing sweep delay and aliasing for time domain reflectometric measurement of liquid height within a tank.
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