一种基于DSPSR和GPU的脉冲星相干消色散基带数据处理技术  

A coherent de-dispersion processing technology on pulsar baseband data based on DSPSR and GPU

作　　者：李浩 罗近涛 潘之辰 孙鹏飞 姜金辰 LI Hao;LUO Jin-tao;PAN Zhi-chen;SUN Peng-fei;JIANG Jin-chen(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 101048,China;Key Laboratory of Precise Navigation and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;National Astronomical Observatory,Chinese Academy of Sciences,Beijing 100101,China;Peking University,Beijing 100871,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049 [3]中国科学院精密导航定位与定时技术重点实验室,西安710600 [4]中国科学院国家天文台,北京100101 [5]北京大学,北京100871

出　　处：《时间频率学报》2021年第3期204-214,共11页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(U1931128,11973046,91736207,42030105);国家重点研发计划资助项目(2017YFA0402602)。

摘　　要：相比于非相干消色散,相干消色散具有色散消除更彻底、可保留原始数据相位、时间分辨率信息等优势,但同时具有运算量大、数据处理耗时长等问题。为实现脉冲星基带数据相干消色散处理,对数据处理流程进行加速,开发一种以DSPSR(digital signal processing software for pulsar)和GPU(graphics processing unit)为数据处理核心的脉冲星数据处理技术。利用高速共享内存实现对环形缓存区两路极化基带数据的读取,结合图形处理器高性能计算技术,使用DSPSR对基带数据进行相干消色散处理。数据处理结果表明,相比于多线程非相干消色散系统,此数据处理技术在数据处理速度方面具有更好的优越性,并可获得更精细的脉冲轮廓。Compared with incoherent de-dispersion,coherent de-dispersion has the advantages of more thorough dispersion elimination,and retaining the original phase information and the time resolution of the original data.However,it comes with challenges such as the massive computations and the longer data processing time.In order to realize a coherent de-dispersion processing of baseband data and accelerate the data processing,a pulsar data processing pipeline using DSPSR(the digital signal processing for pulsars)and GPU(graphics processing unit)as the data processing core is developed.Firstly,through the high-speed shared memory,the circular buffer is used to read the two-polarization baseband data.Combined with the high-performance computing technologies based on the graphics processor,the DSPSR is used to perform coherent de-dispersion,and folding process on the baseband data.Results from this pipeline show that compared with the multi-threaded incoherent de-dispersion system,this data processing technology has advantages in data processing speed and obtaining finer pulse profiles.

关 键 词：脉冲星 相干消色散 脉冲星数字信号处理程序包 图形处理器 脉冲星分布式采集和数据分析处理软件 

分 类 号：P145.6[天文地球—天体物理]