Abstract
Abstract The ability of a frequency-modulated continous-wave system to resolve returns from closely spaced multiple stationary targets is examined. Because the output consists of discrete harmonics of the sweep repetition frequency, a range corresponding to an anharmonic beat frequency results in a spectrum of harmonics. The shape of the spectrum depends on the range and the nature of the target reflection. Unwanted harmonic spectral output results from the periodic sweep discontinuities and from amplitude modulation of the returns, which is caused by the inevitably limited transducer bandwidth and the frequency dependence of attenuation in tissue. Although pulse-echo systems are also subject to frequency dispersion and the transducer bandpass limit, the experimentally verified result is that both range measurement precision and multiple target resolution are inferior to those obtainable from the same transducer with conventional pulse-echo signal processing.
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