Patent ID: 6864832
Filing Date: 2005-03-08
Classification: G01S

Abstract:
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.