Subjects: Astronomy >> Astrophysical processes submitted time 2023-12-06 Cooperative journals: 《天文研究与技术》
Abstract： In response to the requirements of high sampling rate, wide bandwidth, multi-channel amplitude-phase consistency as well as high-speed direct sampling and time-domain data storage in current radio observation devices, this paper investigates and analyzes the technical architecture and functionalities of digital processing systems in multiple radio observation devices. It proposes a 4-channel digital receiver system based on ZYNQ SOC and core components such as ADS54J60. This system achieves a maximum sampling rate of 1GSPS per single channel, demonstrating flexibility and scalability, which allows for the addition of expansion cards to increase sampling channels for meeting the fundamental requirements of future large-scale expandable radio interference arrays. The system consists of three parts: a high-speed data acquisition card, an optical communication receiving card, and a server. Currently, the high-speed serial interface technology based on SerDes has achieved direct sampling with a quantization accuracy of 16 bits and a sampling rate of 300 MSPS, providing a full-scale signal-to-noise ratio of 60 dB, a 40 Gbps SFP+ data transmission bandwidth, and a 1.5 GB/ s PCIe communication bandwidth. It can capture analog signals in the intermediate frequency range of 4.5 MHz to 150 MHz. The system has completed both hardware and software design and testing. In our tests, we sampled a 10 MHz sine wave signal with an amplitude of 125 mV, and the amplitude difference between the 4 channels was less than 1 mV, with a phase delay of less than 3.3 ns. The system integrates programmable SFP+ communication interfaces and a multi-machine synchronization mechanism to accommodate the synchronous acquisition needs of multi-element arrays. It can also store the data of the original radio signals, providing more detailed time-domain data for radio research.
Subjects: Library Science，Information Science >> Library Science submitted time 2016-06-07
Abstract：【目的】了解国内科研人员对 IR 的认知和向 IR 呈缴科研成果的态度、条件与期望。【方法】聚焦“存缴者”用户群体, 以国内教育与科研机构科研人员为对象, 通过定额抽样方法, 从 60 多家单位的 1 500 余名科研人员获取调查数据。采用 SPSS 分析调查数据的信度和效度, 并进行数据分析。【结果】掌握了此次调查范围内国内科研与教育人员对 IR 的认知和向 IR 存缴学术成果的态度、 条件和期望; 基于调查数据, 发现专业研究机构和高校两类机构的科研人员在存缴态度、方式和条件等方面存在部分差异。【局限】总体调查规模有限, 特别是高校用户样本较少。调查结论基于所获得的调查数据, 未必适用于更广泛的用户群体。【结论】调查基本达到预期成效, 针对调查结果, 提出推进中国 IR 实践、提升 IR 成果应用的思考。
Peer Review Status:
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