Polarimetric analysis of an anechoic chamber in a time domain
In an anechoic chamber, radar cross-section (RCS) or antenna measurements intensify the need of knowing perfectly the electromagnetic (em) behavior of the locale of treatment. So it is very important to characterize the noise in the anechoic chamber. This can be done by locating and recognizing the elements which cause the perturbation. In this article a new technique using a combination of polarimetric and time domain analyses is presented. © 1993 John Wiley & sons, Inc.
AbstractIn a physical activity study, the 7-day physical activity log viewed as an alloyed gold standard was used to correct the measurement error in the physical activity questionnaire. Due to correlations between the errors in the two measurements, the usual regression calibration may result to a biased estimate of the calibration factor. We propose a method of removing the correlation through orthogonal decomposition of the errors, then the usual regression calibration can be applied. Simulation studies show that our method can effectively correct the bias.