Abstract
We describe a radio-interferometry method for measuring movement parameters of objects in application to gas-dynamic experiments. The origins of biasing in calculation of these parameters from measured interferograms are discussed. Bias reduction algorithms for the interferometer signal processing are described. For experimental setups with a single moving boundary, this algorithm is optimal for estimating the instantaneous phase and frequency of a narrow-band signal with bandpass prefiltering and quadrature-channel signal orthonormalization. For experiments with several moving boundaries, it provides the interferogram curve fitting by parameters of the electrodynamic model of an experimental setup. The results of test experiments verifying the reliability of the obtained information are presented.
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