Dataset Open Access

Chang'e 5 RF recording at 8486.2 MHz with Allen Telescope Array on 2020-12-20

Estévez, Daniel

This dataset contains a recording of X-band telemetry signals from the Chinese lunar sample retrieve mission Chang'e 5 done on 2020-12-20, after the Earth flyby, in a direct trajectory to the Sun-Earth L1 Lagrange point. The recording was done at Allen Telescope Array using antenna 2h in dual XY (linear) polarization.

The hardware configuration was as follows: antenna 2h was connected to RFCB LO d, which was tuned to a frequency of 8475 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 30.72 Msps and a GNU Radio flowgraph was used to channelize four frequencies from the spacecraft (8463.7, 8471.2, 8478.6 and 8486.2 MHz), using an IQ sample rate of 480 ksps for each channel. Only the 8471.2 MHz and 8486.2 MHz channels contains signals from the spacecraft.

The GNU Radio flowgraph stored the IQ data for each channel as 32-bit floats in the GNU Radio metatata file format, with detached headers. After recording, the data was converted 16-bit integers and SigMF format.

This dataset contains the IQ data for the channel at 8486.2 MHz, in SigMF format. Each polarization is in a different file. The original metadata headers are also provided. This dataset contains the both the X and Y polarizations.

Files (49.1 GB)
Name Size
CE5_2020-12-20T17:31:55.078986_0x_3.hdr
md5:8a83799160631b224aebf3ab872aec99
2.9 MB Download
CE5_2020-12-20T17:31:55.078986_0x_3.sigmf-data
md5:ccde3b73a250587477375e3b2fd9c7ce
24.6 GB Download
CE5_2020-12-20T17:31:55.078986_0x_3.sigmf-meta
md5:0975047039277c6dbc4f7a1d04216c5b
747 Bytes Download
CE5_2020-12-20T17:31:55.078986_0y_3.hdr
md5:8a83799160631b224aebf3ab872aec99
2.9 MB Download
CE5_2020-12-20T17:31:55.078986_0y_3.sigmf-data
md5:ee7594411562ca02d8be97eef949cf8c
24.6 GB Download
CE5_2020-12-20T17:31:55.078986_0y_3.sigmf-meta
md5:423b45bf08af226f84c72c6c9093d68d
747 Bytes Download
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