VLBI硬件相关处理机VDIF格式容错高速数据回放方法研究

VLBI(Very Long Baseline Interferometry) is an important radio astronomy technology, is widely used in deep-space probers high-precision measurement. The correlator as the core data pre-processing equipment of VLBI, its performance is very important. At present, China VLBI data acquisition system (CDAS) can collect data 2Gbps, and multiband combination can reach 16/32Gbps. But the existing VLBI data correlate system cannot meet the requirements of high speed and real time data playback. Following the development of internationalization, the international general VDIF format data has become necessary. The used of e-VLBI make it possible of real-time observation, but follow some problem like lost data、wrong data for correlator data playback because the volatile high speed Ethernet. For ensure the requirements of more speed and more high-precision and internationalization, the project will using Uniboard as the hardware platform, research VDIF format data high-speed playback method of VLBI hardware correlator, research the VLBI data playback which speed up to 4Gbps for single CDAS, and design VDIF format decode IP Core with VLBI data validation. The results will be verified and applied in high speed Correlator.

甚长基线干涉测量（VLBI）是重要的射电天文技术，是国际上广泛采用的深空探测器高精度测量手段。相关处理机是VLBI的核心数据预处理设备之一，它的性能至关重要。目前,国内VLBI数据采集系统, 单个CDAS数据采集己达2Gbps,多频段组合则可达16/32Gbps，现有VLBI数据相关处理系统还不能满足如此高速实时的数据回放。随着国际化的发展，国际通用VDIF数据格式也成为必需。e-VLBI的应用使实时观测成为可能，但是高速互联网的多变性也带来了数据出错和丢包等现象。为了满足越来越高速高精的相关处理及国际化要求，本项目拟采用Uniboard为系统硬件开发平台, 开展VLBI硬件相关处理机的VDIF格式容错高速数据回放方法研究，研究设计数据回放速度达4Gbps，并具有VLBI数据纠错能力的VDIF格式容错解码IP core。研究成果将在高速相关处理中验证和应用。

甚长基线干涉测量（VLBI）是重要的射电天文技术，是国际上广泛采用的深空探测器高精度测量手段。相关处理机是VLBI的核心数据预处理设备之一，它的性能至关重要。目前,国内VLBI数据采集系统, 单个CDAS数据采集己达2Gbps,多频段组合则可达16/32Gbps，现有VLBI数据相关处理系统还不能满足如此高速实时的数据回放。随着国际化的发展，国际通用VDIF数据格式也成为必需。e-VLBI的应用使实时观测成为可能，但是高速互联网的多变性也带来了数据出错和丢包等现象。为了满足越来越高速高精的相关处理及国际化要求，本项目采用Uniboard为系统硬件开发平台, 开展VLBI硬件相关处理机的VDIF格式容错高速数据回放方法研究，研究设计数据回放速度达4Gbps，并具有VLBI数据纠错能力的VDIF格式容错解码IP core。研究成果在高速相关处理中验证和应用。