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We consider the problem of evaluating the square-law accuracy (ldquolinearityrdquo) of a microwave radiometer. In order to reduce linearity errors below the noise level, linearity error of the square law detector less than 10-4 times the linear output is needed. We derive a Volterra model of the detectorpsilas response to noise and use sinusoidal excitations to extract the kernels. By using relatively...
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