The world's most powerful steerable 110-meter radio telescope, also known as the QiTai radio Telescope (QTT), will be built by Xinjiang Astronomical Observatory (XAO) of the Chinese Academy of Sciences (CAS) over a period of six years. Its ceremony kicked off on Sept. 21, 2022.
QTT will be equipped with multiple ultra-wideband receivers, which can improve the observation sensitivity of theby increasing the bandwidth. However, it also poses challenges to signal acquisition, transmission and processing. In addition, the wider bandwidth will incorporate more electromagnetic interference signals, which will affect the quality of astronomical observation and cause a saturation effect on the system.
In order to avoid UWB signal phase and amplitude fluctuations caused by environmental and temperature changes in the analog transmission link, researchers from XAO designed a new UWB signal acquisition and processing experimental system that uses a high-performance, low-power RFSoC circuit to directly sample the radio-frequency signal at the receiver end.
The proposed system is more flexible and expandable, and its control program can configure the involved computing resources according to the observation bandwidth and computational complexity.
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