Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1990-08-07
1993-03-16
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342189, 342195, 342200, G01S 1332
Patent
active
051948702
ABSTRACT:
FMCW radar return signals are converted to i.f. in a front end section, digitised in an A-D converter, and reduced to in-phase and quadrature base band components at a lower sampling rate in a filter section. Returns are compared with a separate reference waveform signal from a generator for each range cell by a multiplier and an accumulate and dump function. The reference waveforms for subsequent range cells are delayed by one sample period. The provision of separate correlation of de-ramping for each range cell enables non-linear sweep wave forms to be employed, whereas the conventional method using a single Fourier Transform for all range cells simultaneously restricts operation to a linear sweep waveform.
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Pearce Timothy H. B.
Summers Brent
Sotomayor John B.
The Marconi Company Limited
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