Arrangement for the precise distance measuring, in particular the filling level measuring
AssigneeEADS Deutschland GmbH
InventorsStefan Cramer, Berthold Zimmermann, Rolf Gluth
Life of this patent
Estimating the term…
Abstract
An arrangement for the precise measuring of the distance with a FMCW radar device having a frequency-variable digitally-actuated oscillator to generate a transmitting frequency which can be tuned over a predetermined frequency range. The digital actuation involves the use of a digital frequency generator which derives in predetermined frequency steps a references signal from a fixed-frequency oscillator signal. The frequency of the frequency-variable oscillator is adjusted in a phase-locked loop linking it to the references signal.
Claims11
An arrangement for precisely measuring distance with a FMCW radar device having a frequency-variable oscillator actuated by digital means to generate a transmitting frequency that is tunable over a predetermined frequency range, with said digital means comprising a digital frequency generator that derives, in predetermined frequency steps, a reference signal from a fixed-frequency oscillator signal, with the frequency of the frequency-variable oscillator being adjusted in a phase-locked loop by comparing the oscillator frequency to the reference signal.
An arrangement for precisely measuring distance with a FWCW radar system comprising:
- a frequency-variable oscillator for generating a transmitting frequency that is tunable over a predetermined frequency range;
- a phase-lock loop in which said oscillator is connected for controlling an output frequency/phase of the oscillator and including a comparator for comparing the output frequency/phase of the oscillator with a reference frequency signal;
- and
- a digital frequency generator for deriving a reference signal in predetermined frequency steps from a fixed-frequency oscillator signal and for supplying the derived reference signal to said comparator for comparison with the output frequency/phase of the oscillator.
Dependencies are inferred from the claim text.