Design and implementation of PFB module with 10G network transmission system in CDAS2

Wei Yu; Renjie Zhu; Lan Chen; Yajun Wu; Xiuzhong Zhang

doi:10.1117/1.JATIS.4.4.048004

8 December 2018 Design and implementation of PFB module with 10G network transmission system in CDAS2

Wei Yu, Renjie Zhu, Lan Chen, Yajun Wu, Xiuzhong Zhang

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 4, 048004 (December 2018). https://doi.org/10.1117/1.JATIS.4.4.048004

Abstract

Digital baseband converters (DBBC) are among the core equipment in a very long baseline interferometry (VLBI) system, which undertakes missions of data acquisition, analog-to-digital conversion, and frequency selection. In order to enhance the measurement resolution of the Chinese VLBI Network (CVN), a new generation of DBBC named CDAS2 (the second-generation Chinese VLBI data acquisition system) has been developed. CDAS2 uses polyphase filter banks (PFB) and fast Fourier transform to convert signals from intermediate frequency to baseband. A high-speed sampling analog-to-digital converter is adopted to guarantee CDAS2’s broadband observation ability. In order to facilitate the broadband observation ability of CDAS2, a high-speed data transmission system is designed to transmit data from CDAS2 to a data recording server. The data transmission system includes a Mark5B formatter and a 10G network transmission system. We describe the detailed design of PFB and the data transmission system. We installed two CDAS2s in two radio astronomical telescopes of Shanghai Astronomical Observatory to carry out observation experiments for the radio source of 4C39.25. After processing with DiFX, we got interference fringes successfully. Our experiment demonstrates the validity and performance of CDAS2.

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Wei Yu, Renjie Zhu, Lan Chen, Yajun Wu, and Xiuzhong Zhang "Design and implementation of PFB module with 10G network transmission system in CDAS2," Journal of Astronomical Telescopes, Instruments, and Systems 4(4), 048004 (8 December 2018). https://doi.org/10.1117/1.JATIS.4.4.048004

Received: 26 March 2018; Accepted: 5 November 2018; Published: 8 December 2018

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KEYWORDS

Clocks

Telescopes

Interfaces

Digital recording

Data transmission

Astronomical telescopes

Field programmable gate arrays

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