Method and device for determining separation and relative speed of a distant object
First Claim
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1. A method for determining the distance and relative speed of at least one object remote from an observation point, comprising the steps of:
- emitting two electromagnetic signals from the observation point, said two electromagnetic signals being embedded in a single signal by being emitted alternately in sections, the frequencies in said single signal being constant within any section and, for each of the two electromagnetic signals, being shifted stepwise from section to section by one step for each successive shift over a modulation range during a measuring interval, said two electromagnetic signals having a predetermined frequency spacing from one another;
detecting echo signals after reflection of the emitted signals at the object by sampling at least one sample each of the alternative echo signal sections and feeding them alternately to evaluation devices for evaluating frequency and phase of both signals separately; and
evaluating the phase difference of the detected frequencies of the alternative sections in each said echo signal in order to determine distance and relative speed of the object.
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Abstract
The distance and relative speed of an object remote from an observation point determined using a signal form which includes two signals having a predetermined spacing relative to each other. The two signals are transmitted for a certain time interval during which the frequency of the signals is modulated in a stepwise fashion. Additionally, the signal sections of the two signals are transmitted alternately for each step so that there is a predetermined frequency spacing between the signal sections being emitted consecutively.
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Citations
22 Claims
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1. A method for determining the distance and relative speed of at least one object remote from an observation point, comprising the steps of:
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emitting two electromagnetic signals from the observation point, said two electromagnetic signals being embedded in a single signal by being emitted alternately in sections, the frequencies in said single signal being constant within any section and, for each of the two electromagnetic signals, being shifted stepwise from section to section by one step for each successive shift over a modulation range during a measuring interval, said two electromagnetic signals having a predetermined frequency spacing from one another;
detecting echo signals after reflection of the emitted signals at the object by sampling at least one sample each of the alternative echo signal sections and feeding them alternately to evaluation devices for evaluating frequency and phase of both signals separately; and
evaluating the phase difference of the detected frequencies of the alternative sections in each said echo signal in order to determine distance and relative speed of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for determining the distance and relative speed of at least one object remote from the apparatus, comprising:
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an electromagnetic transmitter for two electromagnetic signals, said two signals being embedded in a single signal by being emitted alternately in sections, the frequencies in said single signal being constant within any section and, for each of the two electromagnetic signals, being shifted stepwise from section to section by one step for each successive shift over a modulation range during a measuring interval, said two electromagnetic signals having a predetermined frequency spacing from one another;
detector for echo signals reflected from the object, sampling at least one sample each of the alternative echo signal sections and feeding them alternately to evaluation devices, the evaluation devices evaluating frequency and phase of both signals separately and evaluating the phase difference of the detected frequencies of both echo signals for determining distance and relative speed of the object. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification