Published December 4, 2022 | Version v1
Dataset Open

Recording of Artemis I Orion with the Allen Telescope Array on 2022-11-16 (part 1/2)


This dataset contains an IQ recording of the S-band 2216.5 MHz telemetry signal from the Artemis I Orion Multipurpose Crewed Vehicle. The recording was done on 2022-11-16, about seven hours after launch. Antenna 1a from the Allen Telescope Array was used in dual XY (linear) polarization.

The hardware configuration was as follows: the antenna was connected to RFCB LO d, which was tuned to a frequency of 2216.5 MHz and used an output IF of 512 MHz. A USRP N321 was connected to the IF output of the RFCB. The USRP N321 digitized both polarizations of the antenna. The USRP used an external 10 MHz reference and PPS coming from the observatory distribution system, and LO sharing was set up among the two channels. The IQ sample rate of the USRP was 10.24 Msps 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 postprocessed to synthesize the signal polarization (which is expected to be RHCP) by finding and correcting the amplitude and phase offset between the X and Y channels, and adding coherently both channels. The data was converted to 8-bit to reduce the size of the dataset. Finally the dataset was formatted using SigMF.

This dataset contains part 1. Part 2, which contains a recording done at a later time during the same session can be found here.


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