Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Reexamination Certificate
2007-08-01
2010-06-15
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
C342S100000, C342S128000, C342S173000, C342S200000
Reexamination Certificate
active
07737885
ABSTRACT:
The invention relates to an FMCW radar system and a method of operating an FMCW radar system to produce a linear frequency ramp. The FMCW radar system includes a VCO, a frequency divider coupled to the VCO output, followed by an A/D converter. A down-converter shifts the digitally converted signal to baseband samples, followed by a low-pass filter coupled to an output thereof. A VCO frequency estimator produces instantaneous VCO frequency estimates from phase differences determined from the filtered baseband samples. A D/A converter coupled to an output of the VCO frequency estimator produces an input signal for the VCO to produce therewith a linear VCO frequency ramp. A Δ-Σ modulator is coupled between the VCO frequency estimator and the input of the D/A converter to produce a dithered VCO control signal, thereby increasing the effective number of bits of the D/A converter.
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Christmann, M., et al., “SAW based Delay Locked Loop concept for VCO linearization in FMCW Radar sensors,” 33rdEuropean Microwave Conference, 2003, Munich, Germany, pp. 1135-1138.
Fuchs, J., et al., “Simple Techniques to Correct for VCO Nonlinearities in Short Range FMCW Radars,” IEEE MTT-S Digest, 1996, pp. 1175-1178.
Galt Cassi
Infineon - Technologies AG
Slater & Matsil L.L.P.
Tarcza Thomas H
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