Earth-Venus-Earth, 22-03-2025

This is a preliminary data release of the Earth-Venus-Earth bounces performed by the Dwingeloo and Stockert
radio telescopes on March 22nd 2025.

This work is licensed under a Creative Commons Attribution 4.0 International License
https://creativecommons.org/licenses/by/4.0/

The author of the Dwingeloo files is Stichting Radiotelescoop Dwingeloo.
The author of the Stockert files is Astropeiler Stockert e.V.

name, tx_time, signal_file, frequency, sdr_gain, rx_time_dwingeloo, rx_time_stockert

cw1, 2025-03-22T12:01:00.000, "cw-0-278.sigmf-meta", 1299500000.0, 56, 2025-03-22T12:05:39.975033, 2025-03-22T12:05:39.974486
cw2, 2025-03-22T12:11:00.000, "cw-0-278.sigmf-meta", 1299500000.0, 56, 2025-03-22T12:15:39.974910, 2025-03-22T12:15:39.974371
cw3, 2025-03-22T12:21:00.000, "cw-0-278.sigmf-meta", 1299500000.0, 56, 2025-03-22T12:25:39.974849, 2025-03-22T12:25:39.974319
cw4, 2025-03-22T12:31:00.000, "cw-0-278.sigmf-meta", 1299500000.0, 56, 2025-03-22T12:35:39.974850, 2025-03-22T12:35:39.974331

Dwingeloo WhiteRabbit PPS offset (maser-gps in microseconds):

2025-03-22T11:59:21 11.823
2025-03-22T13:59:21 11.831

This time offset has not been corrected for in the above timestamps (however for a 
long CW it does not really make a difference).

Files:

dwingeloo_eve_full:    2700 second file containing transmissions and receptions in Dwingeloo
dwingeloo_eve_extract: 280 second extracts containing the CW echo returns in Dwingeloo
stockert_eve_full:     2700 second file containing alll receptions in Stockert
stockert_eve_extract:  280 second extracts containing the CW echo returns in Stockert

The Stockert SigMF files contain two channels for horizontal and vertical polarization (assignment tbd). To combine 
them to LHCP, use: stockert_lhcp = stockert_chan0 + np.exp(1j*260*np.pi/180)*stockert_chan1;

Dwingeloo SigMF is LHCP.

See the notebook eve-cw-detect-example.html how to process the data (original in eve-cw-detect-example.ipynb).

The files dwingeloo_venus_doppler.csv and stockert_venus_doppler.csv contain the expected frequency offsets and 
Doppler rates for RX timestamps in the SigMF files.