GBD-DART-II：从加尔比达纳尔观测站对脉冲星进行175 MHz偏振观测及新的脉冲星信号处理流水线
GBD-DART-II: 175 MHz Polarimetric Observation of Pulsars from Gauribidanur and a New Pulsar Signal Processing Pipeline
AI总结：
GBD-DART-II开发了新的脉冲星信号处理流水线，用于175 MHz观测脉冲星并进行偏振研究。
摘要：
一种新的脉冲星信号处理流水线已开发用于使用钻石阵列射电望远镜观测脉冲星。该阵列由32个偏振双极化的LPDAs组成，其在130至350 MHz之间的名义增益为22 dBi，175 MHz时的半功率宽度为15度，适用于脉冲星的传输观测。定制的接收器和实时数据采集和分析工具已开发并使用。接收器输出电压来自暂态缓冲器，以及适用于暂态搜索和脉冲星研究的高分辨率和低分辨率的全偏振频谱数据。此外，为已知脉冲星生成全偏振折叠科档案，在子积分中使用，并且进行相干和非相干去散射。定制开发的Python程序、FFT库、DSPSR、PSRCHIVE和Presto模块已被用于构建流水线。流水线的功能通过人工生成的脉冲星信号和强天体源验证后才被释放用于常规观测。目前，流水线配置为在170至196 MHz之间观测脉冲星，每天进行一次。记录的数据在每次观测后立即进行在线处理，几乎以1:1的比例匹配观测时间。Intel i9服务器捕获数据，AMD R9 CPU进行主要数据处理。档案定期通过互联网备份到远程系统。本文介绍了所开发信号处理流水线的架构、其验证以及对五个明亮脉冲星在175 MHz观测的初始偏振结果。结果还包括B0953+08、B0531+21和B1133+16的RM估计和单脉冲研究结果，以及对蟹状脉冲星在200天观测期间自转减速的监测。最后，还讨论了该阵列的潜在改进。
英文摘要：
A new pulsar signal-processing pipeline has been developed for observing pulsars with the Diamond Array Radio Telescope at the Gauribidanur radio observatory. The array consists of 32 off-axis dual-polarised LPDAs, with a nominal gain of 22 dBi between 130 and 350 MHz and a 15-degree HPBW at 175 MHz for transit observations on pulsars. Custom-built receivers and real-time data-capture and analysis tools have been developed and used. Receiver output voltages from a transient buffer, as well as full-polar spectral data at both high and low resolutions, suitable for transient searches and pulsar studies. Additionally, full-polar folded profile archives are generated for known pulsars in subintegrations and both coherent and incoherent dedispersion. Custom-developed Python routines, FFT libraries, DSPSR, PSRCHIVE, and Presto modules have been used to build the pipeline. The functionalities of the pipeline were validated with artificially generated pulsar signals and strong celestial sources before it was released for routine observations. Presently, the pipeline is configured to observe pulsars between 170 and 196 MHz, with a daily cadence. Recorded data are reduced in-line immediately following each observation, nearly matching the observation time at a 1:1 ratio. An Intel i9 server captures the data, and an AMD R9 CPU does the primary data reduction. The archives are routinely backed up to a remote system via the internet. The paper presents the architecture of the signal processing pipeline developed, its validation, and initial polarimetric results observing five bright pulsars at 175 MHz. Results also include RM estimates and single-pulse study results for B0953+08, B0531+21, and B1133+16, as well as from monitoring the spin-down of the Crab pulsar over 200 days of observation. Finally, it presents a discussion on the potential improvements for the array.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
