Recording of Psyche with the Allen Telescope Array shortly after launch (decimated)

This dataset contains an IQ recording of the X-band 8417.7 MHz telemetry signal from the Psyche spacecraft done with the Allen Telescope Array starting only 1 hour 30 minutes after launch. Antennas 1a and 5c from the ATA were used in dual linear polarization (X and Y polarizations).

The hardware configuration was as follows: the antennas were connected to RFCB LO d, which was tuned to a frequency of 8417 MHz and used an output IF of 512 MHz. A USRP N321 and N320 digitized both polarizations of each antenna. The USRPs used an external 10 MHz reference and PPS coming from the observatory distribution system, and LO sharing was set up among the four channels. The IQ sample rate of the USRPs was 4.096 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 downsampled to 128 ksps centered around 8417.525 MHz and formatted using SigMF with the script do_sigmf.py. This reduced bandwidth is sufficient to decode the low data rate (2 kbps) telemetry signal. There is a higher data rate (61.1 kbps) signal, as well as sequential ranging tones, near the end of the recording for which this bandwidth is insufficient. The original 4.096 Msps data for this part of the recording has been published for a single antenna and polarization in 8-bit resolution in the dataset "Recording of Psyche with the Allen Telescope Array shortly after launch (wideband)".