校园网Cosmic Ray检测器中的PDKEEPAAA时间同步
GPS Time Synchronization in School-Network Cosmic Ray Detectors
摘要：
用于学校网络宇宙射线探测器的QuarkNet DAQ卡为使用标准粒子和核物理快脉冲电子模块提供了一种低成本的替代方案。每个探测器站由4个闪烁计数器模块、前端电子设备和一个GPS接收器组成，以ASCII文本字符串的形式产生数据流，这些字符串具有可识别的一组格式，用于不同的功能。该卡包括一个低成本的全球定位系统接收器模块，它允许时间戳事件触发约50纳秒的精度在UTC之间的广泛分离的网站。用于获得精确的GPS时间的技术使用1PPS信号，这通常不适用于商业GPS模块的用户。我们对库存模型进行了轻微的定制修改，以访问此信号。推导时间值的方法是根据为K2K长基线中微子实验开发的方法改编的。使用的低成本GPS模块的性能与已知质量的更昂贵的单元的性能进行比较。
英文摘要：
The QuarkNet DAQ card for school-network cosmic ray detectors provides a low-cost alternative to using standard particle and nuclear physics fast pulse electronics modules. Individual detector stations, each consisting of 4 scintillation counter modules, front-end electronics, and a GPS receiver, produce a stream of data in form of ASCII text strings in identifiable set of formats for different functions. The card includes a low-cost GPS receiver module, which permits timestamping event triggers to about 50 nanosecond accuracy in UTC between widely separated sites. The technique used for obtaining precise GPS time employs the 1PPS signal, which is not normally available to users of the commercial GPS module. We had the stock model slightly custom-modified to access this signal. The method for deriving time values was adapted from methods developed for the K2K long-baseline neutrino experiment. Performance of the low-cost GPS module used is compared to that of a more expensive unit with known quality.
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