Dataset Open Access

James Webb Space Telescope S-band recording with Allen Telescope Array (320 kHz bandwidth)

Estévez, Daniel

This dataset contains a recording of the S-band telemetry downlink of James Webb Space Telescope. The recording was done on 2021-12-26, roughly one day after launch, using Allen Telescope Array 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 2270.5 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 3.84 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 decimated to 320 ksps and converted to SigMF format. By using 320 ksps, residual carrier and 80 kbaud PCM/PM/NRZ telemetry modulation are still present in decimated recording. However, the sequential ranging tones are outside of the decimated recording passband. An excerpt of the full 3.84 Msps recording, which contains the sequential ranging tones, is published as the dataset "James Webb Space Telescope S-band recording with Allen Telescope Array (wideband excerpt)". Detached metadata files, with .hdr extension, contain the metadata for the original 3.84 Msps recording.

Files (43.0 GB)
Name Size
JWST_2021-12-26T07:13:56.865585_0x.hdr
md5:2acc25bb7d6f5e1ccf1463f8d9841f9c
3.9 MB Download
JWST_2021-12-26T07:13:56.865585_0x_320ksps.sigmf-data
md5:6da2d47de5d4b2bc754107e84e2c7f5f
21.5 GB Download
JWST_2021-12-26T07:13:56.865585_0x_320ksps.sigmf-meta
md5:8cbe271552f8b6eb6f8c4f086e278078
913 Bytes Download
JWST_2021-12-26T07:13:56.865585_0y.hdr
md5:2acc25bb7d6f5e1ccf1463f8d9841f9c
3.9 MB Download
JWST_2021-12-26T07:13:56.865585_0y_320ksps.sigmf-data
md5:2dbe92b7b5d67ebc7b154cd07e8b7b6b
21.5 GB Download
JWST_2021-12-26T07:13:56.865585_0y_320ksps.sigmf-meta
md5:21b1a51f0e4c71fdf11a6958763a7fce
913 Bytes Download
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