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This paper presents the methods for power system transient signal data acquisition, it includes two key technologies, the first is high-precision GPS-based remote synchronization for data acquisition, and the second is high-speed sampling and storage technologies. For the first problem, a single variable linear regression model is established for the GPS PPS signal and a UCT on-line estimation algorithm...
The specific circumstances under which the van Cittert-Zernike theorem applies in ultrasonic imaging systems are examined through analysis and computations. Expressions are obtained for the mutual coherence function of an incoherent source when the signals are discrete in time and space and have finite lengths. Expressions are also obtained for statistics and effective signal-to-noise ratios that...
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