Dataset Open Access

RF recording of Vega-C MEO cubesats 436 MHz telemetry beacons

Estévez, Daniel

This dataset contains an IQ recording of the 436 MHz telemetry signals of four of the MEO cubesats launched in the Vega-C maiden flight on 2022-07-13: CELESTA, MTCube2, Greencube and AstroBio Cubesat. The recording was done on 2022-07-24 from 40.5958º N, 3.6991º W, 800 m ASL, near Madrid (Spain). This is a urban location, so the RFI is quite high.

A 7 element yagi antenna built by Arrow and a USRP B205mini were used. The antenna was held on a tripod and aimed manually. The antenna polarization was horizontal with respect to the local horizon (parallactic angle rotation should be taken into account to derive the sky polarization). It was connected to the SDR with a short (~1 metre) piece of coaxial cable.

The signals have rather low SNR, due to the high RFI and the small antenna used. Weak packets from CELESTA and very weak long bursts from Greencube can be seen. Signals from MTCube2 and AstroBio were not detected.

The USRP digitized at 4 Msps IQ with a centre frequency of 436.52 MHz. A GNU Radio flowgraph was used for Doppler correction and channelization. A channel of 40 ksps IQ was recorded around the nominal frequency of each satellite. Two different channels were used for AstroBio Cubesat, due to the uncertainty in its transmit frequency caused by a reset of the satellite's radio to factory settings. Each channel is given in a different file, identified by the name of the corresponding satellite.

The recordings of the satellites are contained in the files identified as 2022-07-24T18_47_38. The files with later timestamps (2022-07-24T19_25_49 and 2022-07-24T19_29_02) are short recordings of a CW carrier injected into the receiver for absolute amplitude calibration.

The data was recorded using GNU Radio metadata format with detached headers and converted to SigMF format in postprocessing. The detached headers of the GNU Radio metadata format are provided with the .hdr extension.

The Doppler correction files are also included in this dataset. These are text files that contain tabulated timestamps in seconds of UNIX time and Doppler frequency in Hz. They were generated using the TLEs from Celestrak and the Skyfield Python library.

More information about this recording, including the details of the absolute amplitude calibration, can be found in the post "Trying to observe the Vega-C MEO cubesats" by the author.

Files (1.9 GB)
Name Size
ASTROBIO2_2022-07-24T18_47_38.hdr
md5:ab23125874b46ec4660fb74330a31c69
3.9 kB Download
ASTROBIO2_2022-07-24T18_47_38.sigmf-data
md5:eba65e969180af48c31ac2c459885828
356.6 MB Download
ASTROBIO2_2022-07-24T18_47_38.sigmf-meta
md5:cb585c776aab651dbb85456a0c17c438
877 Bytes Download
ASTROBIO2_2022-07-24T19_25_49.hdr
md5:69814a251e0fade85fbf951b6c1aa720
171 Bytes Download
ASTROBIO2_2022-07-24T19_25_49.sigmf-data
md5:af8c41d386a3dd1cc632141d2e23873e
11.2 MB Download
ASTROBIO2_2022-07-24T19_25_49.sigmf-meta
md5:810516290799d77016a347938d4c6bdd
877 Bytes Download
ASTROBIO2_2022-07-24T19_29_02.hdr
md5:ffce3af299b49d87cc94dead3b4155bb
171 Bytes Download
ASTROBIO2_2022-07-24T19_29_02.sigmf-data
md5:ae596e71dbbc56b0d6e6b8d5078590d3
13.6 MB Download
ASTROBIO2_2022-07-24T19_29_02.sigmf-meta
md5:a8ded0e5a765612cc65c69b944ddfaaa
877 Bytes Download
ASTROBIO_2022-07-24T18_47_38.hdr
md5:ab23125874b46ec4660fb74330a31c69
3.9 kB Download
ASTROBIO_2022-07-24T18_47_38.sigmf-data
md5:6114ddac759bf2d58ec00227c7b26f4d
356.6 MB Download
ASTROBIO_2022-07-24T18_47_38.sigmf-meta
md5:ad2ca8f13dc9dfc6e4c7a3139c097077
876 Bytes Download
ASTROBIO_2022-07-24T19_25_49.hdr
md5:9898ea68e0c05796927de1c2761ddfe3
171 Bytes Download
ASTROBIO_2022-07-24T19_25_49.sigmf-data
md5:42793578a361b2aba37726cfd9f07469
11.2 MB Download
ASTROBIO_2022-07-24T19_25_49.sigmf-meta
md5:6f6a06244425d743a3f7a710d2986450
876 Bytes Download
ASTROBIO_2022-07-24T19_29_02.hdr
md5:ffce3af299b49d87cc94dead3b4155bb
171 Bytes Download
ASTROBIO_2022-07-24T19_29_02.sigmf-data
md5:c7ca2137a0f24268ff2c06fd0c9f6754
13.6 MB Download
ASTROBIO_2022-07-24T19_29_02.sigmf-meta
md5:5fcf8d50656ea697645f11d5216ec313
876 Bytes Download
ASTROBIOCUBESAT_doppler.txt
md5:cd5a174cab996944a2efc956887ecd81
2.3 MB Download
CELESTA_2022-07-24T18_47_38.hdr
md5:ab23125874b46ec4660fb74330a31c69
3.9 kB Download
CELESTA_2022-07-24T18_47_38.sigmf-data
md5:82002aa80c2f77766f85f0ea8467eda5
356.6 MB Download
CELESTA_2022-07-24T18_47_38.sigmf-meta
md5:2074ede6680085e4cc6cdd2923b0a98c
875 Bytes Download
CELESTA_2022-07-24T19_25_49.hdr
md5:cc316607ddc53bdd15d73ae0713f99d1
171 Bytes Download
CELESTA_2022-07-24T19_25_49.sigmf-data
md5:b0f0a276df01854f2830a878b3f0857b
11.2 MB Download
CELESTA_2022-07-24T19_25_49.sigmf-meta
md5:d1fdca3fb6387b2d10b60ace1f90b393
875 Bytes Download
CELESTA_2022-07-24T19_29_02.hdr
md5:ffce3af299b49d87cc94dead3b4155bb
171 Bytes Download
CELESTA_2022-07-24T19_29_02.sigmf-data
md5:d1c0d3c99d129057c3f7289e5a98de40
13.6 MB Download
CELESTA_2022-07-24T19_29_02.sigmf-meta
md5:ced4d58be098ad33938a7e5b31448585
875 Bytes Download
CELESTA_doppler.txt
md5:0add5ba38f58ecb1d0aa620581c05a8a
2.3 MB Download
GREENCUBE_2022-07-24T18_47_38.hdr
md5:ab23125874b46ec4660fb74330a31c69
3.9 kB Download
GREENCUBE_2022-07-24T18_47_38.sigmf-data
md5:139401fbe4a34341b5f40a70fbb3ebe1
356.6 MB Download
GREENCUBE_2022-07-24T18_47_38.sigmf-meta
md5:ffb02e395789c41a3fd2fd0894dadb11
877 Bytes Download
GREENCUBE_2022-07-24T19_25_49.hdr
md5:9898ea68e0c05796927de1c2761ddfe3
171 Bytes Download
GREENCUBE_2022-07-24T19_25_49.sigmf-data
md5:a9673e5b2387526589364f3d80f3b993
11.2 MB Download
GREENCUBE_2022-07-24T19_25_49.sigmf-meta
md5:1e387541cb815df1aec4d7d8911da97d
877 Bytes Download
GREENCUBE_2022-07-24T19_29_02.hdr
md5:ffce3af299b49d87cc94dead3b4155bb
171 Bytes Download
GREENCUBE_2022-07-24T19_29_02.sigmf-data
md5:4bc74701c76fd611279eaf7eddee2ab1
13.6 MB Download
GREENCUBE_2022-07-24T19_29_02.sigmf-meta
md5:ce89b9a297af8ea02a8760dfc8957f0a
877 Bytes Download
GREENCUBE_doppler.txt
md5:50e477e7982407c8e9f909e8d99b45f3
2.3 MB Download
MTCube-2_doppler.txt
md5:a6b0080d9f84dc725f4f77dcd226a4fd
2.3 MB Download
MTCube2_2022-07-24T18_47_38.hdr
md5:ab23125874b46ec4660fb74330a31c69
3.9 kB Download
MTCube2_2022-07-24T18_47_38.sigmf-data
md5:d4978f4d06e5993a2458c0c5895ebd3c
356.6 MB Download
MTCube2_2022-07-24T18_47_38.sigmf-meta
md5:0cf5a4c179263bcbd07541546ee0591e
875 Bytes Download
MTCube2_2022-07-24T19_25_49.hdr
md5:a7480009652c574870fc904ae72e304f
171 Bytes Download
MTCube2_2022-07-24T19_25_49.sigmf-data
md5:8c7c88808fe13805948b015ef2edf725
11.2 MB Download
MTCube2_2022-07-24T19_25_49.sigmf-meta
md5:006205b0a90fd868c05bbfea85e090a5
875 Bytes Download
MTCube2_2022-07-24T19_29_02.hdr
md5:ffce3af299b49d87cc94dead3b4155bb
171 Bytes Download
MTCube2_2022-07-24T19_29_02.sigmf-data
md5:3b4cf0cbf48fe60f9135fbc05e713075
13.6 MB Download
MTCube2_2022-07-24T19_29_02.sigmf-meta
md5:0af2e3803ff52d3870f2867763eac9f5
875 Bytes Download
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