Queqiao recording with Allen Telescope Array on 2021-09-19

This dataset contains a recording of the S-band telemetry downlink from the Queqiao Chang'e 4 relay satellite in orbit around the Earth-Moon L2 Lagrange point. The recording was done on 2021-09-19 at Allen Telescope Array using antenna 2e in dual XY (linear) polarization.

The hardware configuration was as follows: antenna 2e was connected to RFCB LO d, which was tuned to a frequency of 2234.5 MHz and used an output IF of 512 MHz. A USRP N321 was connected to the IF output of the RFCB and digitized both polarizations. The USRP used external 10 MHz reference and PPS coming from the observatory distribution system. The IQ  sample rate of the USRP was 480 ksps and a GNU Radio flowgraph was used to record IQ data to disk.

The GNU Radio flowgraph stored the IQ data for each channel as 16-bin integers in the GNU Radio metatata file format, with detached headers. After recording, the data was converted to SigMF format.