The Study of Digital Filtering on VLBI Data Acquisition

XIANG Ying; ZHANG Xiu-zhong

Publications of the Yunnan Observatory > 2003 > 0(4): 19-27.

XIANG Ying, ZHANG Xiu-zhong. The Study of Digital Filtering on VLBI Data Acquisition[J]. Publications of the Yunnan Observatory, 2003, (4): 19-27.

Citation:

XIANG Ying, ZHANG Xiu-zhong. The Study of Digital Filtering on VLBI Data Acquisition[J]. Publications of the Yunnan Observatory, 2003, (4): 19-27.

Citation:

XIANG Ying, ZHANG Xiu-zhong. The Study of Digital Filtering on VLBI Data Acquisition[J]. Publications of the Yunnan Observatory, 2003, (4): 19-27.

PDF (423 KB)

The Study of Digital Filtering on VLBI Data Acquisition

Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China

More Information

Received Date: February 13, 2003
Revised Date: May 11, 2003
Published Date: October 14, 2003

Graphical Abstract

Abstract

Abstract

A digital filter for bandwidth selection has obvious advantages on VLBI (Very Long Baseline Interferometry)data acquisition compared with the analog filter. This paper first reviews the development of digital filtering on VLBI data acquisition in Japan and NRAO (the National Radio Astronomy Observatory), then proposes two kinds of systematic implementation of digital filtering.The key factor to implement a filter is the speed of processing signals because of many high-speed arithmetic operations required.Reducing the computation time of digital filtering is important.The filter utilizes RAM look-up tables for tap weight multiplications.Three kinds of structures to realize the digital filter are compared here.Afterwards, the two kinds of systematic implementations are discussed in detail. With a steady advance in the technology of very high-density VLBI integrated circuits in recent years, FPGAs (Field Programmable Gate Array Integrated Circuits)are developed fast and have been proved to be powerful in many fields of digital signal processing.Finally, this paper gives a hardware layout to implement digital filtering based on FPGAs.
- VLBI,
- digital filtering,
- digital mixer,
- A/D sampling

FullText(HTML)

References (0)

Articles Related

[1]	Yang Wenjun, Yang Jun, Jiang Wu, Xia Bo, Li Jian, Cui Lang, Zhang Hua, Li Peng, Gao Zhifu. Installing a VLBI Digital Backend with DBBC2 at Nanshan Station, Xinjiang Astronomical Observatory [J]. Astronomical Research and Technology, 2018, 15(1): 32-39.
[2]	Pei Xin, Chen Maozheng, Li Jian, Yan Hao. An Experiment of VLBI Clock-Signal Distribution through Optical Fibers Based on Signal-Delay Measurement Using a Digital Correlator [J]. Astronomical Research and Technology, 2015, 12(3): 270-276.
[3]	Zhao An, Yan Yihua, Chen Linjie, Liu Donghao, Wang Wei, Chen Zhijun. A Design of an Improved High-Speed FIR Digital Filter Based on the FPGA [J]. Astronomical Research and Technology, 2015, 12(1): 109-116.
[4]	Li Huiling, Chen Maozheng. Optimizing and Simulating a Digital Sideband-Separating Mixer [J]. Astronomical Research and Technology, 2014, 11(3): 275-280.
[5]	Luo Jintao, Chen Lan, Wu Yajun, Xiang Ying, Zhu Renjie, Yu Yun, Shu Fengchun, Hao Longfei, Zhang Xiuzhong. Progress of Testing of a VLBI Digital Baseband Converter [J]. Astronomical Research and Technology, 2010, 7(3): 214-221.
[6]	CHEN Lan, LUO Jin-tao, ZHU Ren-jie, ZHANG Xiu-zhong. Analysis of the Load Performance of ADC in a Digital Baseband Converter for VLBI [J]. Astronomical Research and Technology, 2009, 6(3): 191-197.
[7]	Pan Liande, Wang Suqin, Ma Lanxian. PRELIMINARY STUDIES ON CHARACTERISTICS OF LF SKY-WAVE PROPAGATION AND SOME FEATURES OF THE D REGION OF THE IONOSPHERE ABOVE THE COAST LAND OF EAST CHINA [J]. Publications of the Yunnan Observatory, 1990, 0(S1): 97-102.
[8]	Pan Liande, Wang Suqin, Ma Lanxiang. STUDY ON THE RESPONSE OF THE D-REGION OF THE IONOSPHERE TO THE SOLAR BURSTS [J]. Publications of the Yunnan Observatory, 1990, 0(4): 263-266.
[9]	Lian De PAN, Su Qin WANG, Lan Xian MA. THE OBSERVATIONS AND PRELIMINARY ANALYSES OF THE EFFECTS OF THE SOLAR FLARES ON THE D REGION OF THE IONOSPHERE [J]. Publications of the Yunnan Observatory, 1989, 0(S1): 196-201.
[10]	Gong Yuanfang. A Technique of Uninterrupted ms Sampling [J]. Publications of the Yunnan Observatory, 1988, 0(3): 59-63.