Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Patent
1992-06-15
1993-12-14
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
342114, G01S 740, G01S 1362
Patent
active
052707202
ABSTRACT:
An FMCW radar transmits a signal the frequency of which repeatedly sweeps upwards and downwards at a rate .alpha.. Any target returns are applied to a mixer (6) which is also supplied with a sample of the transmitted signal. During each sweep the mixer output signal is therefore a beat frequency signal the frequency components of which correspond to respective targets. The spectrum of the beat frequency signal is analysed by an FFT-calculating arrangement (16) and the result is applied to a data processor (18) which calculates the ranges of the targets. The constant of proportionality between beat frequency and range is inversely proportional to .alpha., which is subject to uncertainty. In order to resolve this uncertainty, or correct .alpha. to the required value, the velocity of a given radially moving target is calculated in two different ways: from the perceived Doppler shift and from the rate of charge of the beat frequency component due to that target, only one of these being a function of .alpha..
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Kraus Robert J.
Sotomayor John B.
U.S. Philips Corporation
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