Engineering topics
Publications and source records attributed to Xiang, Ying.
VLBI technology development made significant progress at SHAO in the last few years. The development status of the Chinese DBBC, the software and FPGA-based correlators, and the new VLBI antenna, as well as VLBI applications are summarized in this paper.
The Digital Base Band Converter-2 (DBBC2) system is in a mature phase now, and the deployment is continuing. A review of the backend is shown, and the new functionalities in development are reported.
The Chinese Data Acquisition System (CDAS) based on FPGA techniques has been developed in China for the purpose of replacing the traditional analog baseband converter. CDAS is a high speed data acquisition and processing system with 1024 Msps sample rate for 512M bandwidth input and up to 16 channels (both USB and LSB) output with VSI interface compatible. The instrument is a flexible environment which can be updated easily. In this paper, the construction, the performance, the experiment results, and the future plans of CDAS will be reported.
The Digital Base-Band Converters-2 (DBBC2) backend system has been adapted for supporting the VLBI2010 demands. The system architecture for this application is presented.