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Chang’E-3 spacecraft was orbiting the Moon from December 6–14, 2013, and very long baseline interferometry (VLBI) observations were performed to improve the accuracy of its orbit determination. In the process of recording VLBI raw data, 2 bits quantization was implemented. Interesting phenomenon was that signal-to-noise ratio (SNR) of each VLBI station experienced periodical change and had large variation...
The VLBI data acquisition backend plays an important role in the VLBI station. Recently, based on advances in digital hardware like ADC (Analog-to-Digital Conversion), DSP (Digital Signal Processing), FPGA (Field Programmable Gate Arrays) and so on, it has become practical to sample and digitally process the intermediate frequency signal directly. DBBC (Digital Base-Band Converters) will replace ABBC...
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