天文学进展2017，Vol.35Issue(2)：244-254,11.DOI:10.3969/j.issn.1000-8349.2017.02.06
基于ROACH2的脉冲星终端研制进展
The Progress of Pulsar Backend Development Based on ROACH2
摘要
Abstract
Pulsar observation and research is the most important research area in Xinjiang Astronomical Observatory, and that will be the main scientific activity of the Xinjiang 110 meter fully moveable telescope (QTT for short). The pulsar single pulse observation backend used in Nanshan 25 m telescope―AFB has been worked for almost 20 years. Meanwhile, it's system performance declines with time. Thus, we decided to develop a new pulsar backend based on ROACH2 board not only for upgrading of current single pulse observation system but also be a pre-research for QTT backends system. Some advanced techniques have been used in this system to get a very high time precision and to accelerate the processing effciency. We use synchronization of hydrogen clock and GPS time to make an accurate integer time in seconds. Specifically, we count the impulse of sampling clock and pack it to the data frame to get a precision decimal seconds first, and then synthesize both to obtain accurate time information. Finally using shared memory for data sharing between different process to get a real time parallel processing. This backend can be used for single pulse or lower precision timing observation, and also used for searching of pulsar, RRAT or FRB. This system has been already tested on Nanshan 25 m telescope using L band receiver, which includes single pulse, pulsar long time integration and FRB searching observation. Testing results showed that this system works well and has good precision, stability and reliability, which can be implemented for pulsar normal observation in Nanshan 25 m telescope, and also can be used for other telescopes.关键词
观测终端/ROACH2/脉冲星观测/FRBKey words
observation backends/ROACH2/pulsar observation/Fast Radio Burst分类
天文与地球科学引用本文复制引用
裴鑫,李健,袁建平,温志刚,陈卯蒸..基于ROACH2的脉冲星终端研制进展[J].天文学进展,2017,35(2):244-254,11.基金项目
973 计划 (2015CB857100) （2015CB857100）
中国科学院天文台站设备更新及重大仪器设备运行专项 （）
国家自然科学基金(11403091, 11253001, U1431230) （11403091, 11253001, U1431230）
