|
多制式FX型VLBI相关处理机系统的研究
郑为民 张秀忠
舒逢春
(中国科学院上海天文台 上海 200030)
(中国科学院国家天文台 北京 100012)
摘 要
|
介绍了在上海天文台现有两台站VLBA型VLBI相关处理机的基础上同时处理多制式磁带的研究方案。为适应Mark
IV薄磁带，并兼顾1Gbit/s的VLBA格式，需升级现有处理机的高速高密度磁带机，增加磁头组，更换精密薄带读取机构；扩充数据恢复系统和FFT流水线容量。系统采用实时操作系统与FPGA
(Field Programmable Gate Array) 相结合，完成多制式磁带高速数据流的高精度同步控制与实时解码回放、多种实时计算，最终实现Mark
4数据的相关处理，并兼容Mark
IIIA、VLBA格式。
|
|
|
| 关键词 |
多制式 －
VLBI － 相关处理机
－ FPGA |
| 分类号 |
P111.33 |
Researches on the Multi-format Compatible
FX Model VLBI Correlator System
Zheng
Weimin Zhang Xiuzhong
Shu Fengchun
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai
200030)
(National Astronomical Observatonies, Chinese Academy of Sciences, Beijing
100012)
Abstract
|
This paper presents a scheme of modifying the existing two-station
Chinese VLBI Network correlator of Shanghai Astronomical Observatory
to a multi-format compatible one. In order to process the Mark IV
tapes, as well as the VLBA tapes with the data speed up to 1Gbit/s, we
must upgrade the high-speed & high-density tape recorders, add one
headstack, mount the new precise thin tape reading outfit, and expand
the data recovery system and the FFT engines. Adopting the realtime
operating system and the FPGAs (Field Programmable Gate Array), the
correlator can finish synchronizing the multi-format tapes, decoding,
realtime calculating and realize the correlation of the Mark IV, Mark
IIIA, VLBA tapes. |
| |
| Key words |
multi
－
format －
VLBI －
correlator － FPGA |
|
|