Nonlinearity characterisation of microwave detectors for radiometer applications

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Nonlinearity characterisation of microwave detectors for radiometer applications

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The accuracy of microwave radiometers is affected by the deviation of the detector from the ideal square-law behaviour. A method is presented for determining the error caused by higher order nonlinearities, based on the experimental characterisation of the nonlinearities with a two-tone test. In actual operation with Gaussian noise as the input signal, the error caused by higher order nonlinearities is found to be greater than that with sinusoidal input signal.

Inspec keywords: radiometers; measurement errors; microwave detectors; error analysis

Other keywords: microwave radiometers; experimental characterisation; Gaussian noise input signal; radiometer applications; higher order nonlinearities; microwave detectors; two-tone test; ideal square-law behaviour deviation; nonlinearity characterisation

Subjects: Measurement theory; Microwave measurement techniques; Sensing devices and transducers; Detection of radiation (bolometers, photoelectric cells, i.r. and submillimetre waves detection); Measurement and error theory; Microwave circuits and devices

References

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      • D. Middleton . Some general results in the theory of noise through non-linear devices. Quart. Appl. Math. , 445 - 498
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      • P.J. Davis . (1975) Interpolation & approximation.
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      • V.S. Reinhardt , Y.C. Shih , P.A. Toth , S.C. Reynolds , A.L. Berman . Methods for measuring the power linearity of microwave detectors forradiometric applications. IEEE Trans. , 715 - 720
    4. 4)
      • Trier, M.: `Radiometer receiver linearity characterization by intermodulation distortionmethod', IEEE IMTC Conf. Record, 1993, p. 99–102.
    5. 5)
      • Reinhardt, V.S., Shih, Y.C., Toth, P.A., Reynolds, S.C., Berman, A.L.: `Methods for measuring the power linearity of microwave detectors forradiometric applications', IEEE MTT-Symp. Dig., 1994, p. 1477–1480.
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