Voyager-1 recording with Allen Telescope Array on 2020-11-14: scan 4/4

This dataset contains a recording of X-band telemetry signals from Voyager-1 recorded with Allen Telescope Array on 2020-11-14. Antennas 1a and 4g from the array were used in dual XY (linear) polarization. The hardware configuration was as follows: both antennas were connected to RFCB LO d, which was tuned to a frequency of 8419.7 MHz and used an output IF of 512 MHz. A USRP N321 and a USRP N320 were connected to the IF output of the RFCB. The N321 digitized both polarizations from antenna 1a, while the N320 digitized both polarizations of antenna 4g. The USRPs were synchronized by using external 10 MHz reference and PPS coming from the observatory distribution system. The LO from the N321 was shared to all the channels involved in the recording. The IQ sample rate of the USRPs was 960 ksps. A GNU Radio flowgraph was used to record the 16 bit IQ signals to disk using the GNU Radio metatata file format, with detached headers. After recording, the data was converted to SigMF format by adding the suitable metadata. The observation was organized in four scans of 30 minutes each, with gaps of 5 minutes between them where a phase calibrator was observed. This dataset contains the scan 4/4.本数据集包含2020年11月14日使用艾伦望远镜阵列（Allen Telescope Array）记录的旅行者1号（Voyager-1）X波段（X-band）遥测信号录音。该阵列采用1a号与4g号天线开展双XY（线性）极化观测。硬件配置详情如下：两台天线均接入RFCB LO d，该设备调谐至8419.7 MHz的工作频率，输出中频（Intermediate Frequency, IF）为512 MHz。一台USRP N321与一台USRP N320分别连接至RFCB的中频输出端口，其中USRP N321对1a号天线的两路极化信号完成数字化采样，USRP N320则负责4g号天线的两路极化信号数字化。两台USRP通过天文台分配系统提供的外部10 MHz参考时钟与PPS（秒脉冲，Pulse Per Second）信号实现同步。此外，USRP N321的本振信号被共享至本次记录涉及的全部通道。USRP的IQ（同相正交，In-phase and Quadrature）采样速率为960 ksps。本次记录通过GNU Radio流图将16位IQ信号以GNU Radio元数据文件格式写入磁盘，且元数据头与数据文件分离。记录完成后，通过添加适配的元数据将原始数据转换为SigMF（Signal Metadata Format）格式。本次观测分为四次扫描，单次扫描时长为30分钟，扫描间隔为5分钟，间隔期间对相位校准源进行观测。本数据集包含第4/4次扫描的全部数据。