Title :
The high-speed FX correlator of Chinese VLBI network-a super spectrum analyzer based on programmable ASIC
Author :
Zhang, Xiuzhong ; Zheng, Weimin ; Ren, Fangbin ; Zhu, Congxin ; Shu, Fengchun ; Xiang, Ying
Author_Institution :
Acoust. Obs., Acad. Sinica, Shanghai, China
Abstract :
This paper presents the principle and the structure of the 2-station “FX” VLBI correlator of the Chinese VLBI network, which is a super spectrum analyzer based on programmable ASIC. The key spectrum analysing subsystems are composed of high-speed parallel FFT pipelines, which are composed of 136 VLBAI FFT ASICs. It supports six different FFT sizes (64 to 2048 points) with the maximum data rate up to 648 Mbit/s. It takes only 16 μs for the correlator to do 2048-point FFTs of two channels and other mathematical operations, which equates to more than 13.8 G float multiplications and 30.9 G additions every second
Keywords :
application specific integrated circuits; correlators; fast Fourier transforms; pipeline arithmetic; radioastronomical techniques; radiowave interferometry; spectral analysers; 16 mus; 648 Mbit/s; Chinese VLBI network; FFT sizes; additions; float multiplications; high-speed FX correlator; high-speed parallel FFT pipelines; maximum data rate; programmable ASIC; spectrum analysing subsystems; super spectrum analyzer; Application specific integrated circuits; Correlators; Frequency; Observatories; Radio astronomy; Receiving antennas; Signal processing; Space technology; Spectral analysis; Wideband;
Conference_Titel :
Circuits and Systems, 2000. IEEE APCCAS 2000. The 2000 IEEE Asia-Pacific Conference on
Conference_Location :
Tianjin
Print_ISBN :
0-7803-6253-5
DOI :
10.1109/APCCAS.2000.913655
