GNSS timing - sujineie/BURSTT_ASIAA GitHub Wiki
Test with dual inputs
Dual input to a bladeRF (dev6): rx1 = GPS 1, rx2 = GPS 2
* GPS 1 was originally connected to rx1 of dev6
* GPS 2 was originally connected to rx1 of dev13
From previous observations, dev13 signals are generally weaker (or unstable) than dev6 signals, so the two GPS antennas are connected to dev6.
Setting
- Receivers are aligned to E-W: E (GPS 1) -- W (GPS 2)
Basic measurements by GNSS-SDR
Comparison of carrier phases between rx1 and rx2
Satellite #6
- doppler-corrected carrier phase $=$ (carrier phase) $+$ cumulative sum(doppler shift) $\times \ dt$
- zoom-in (Carrier phase)
- zoom-in (Doppler-corrected)
Satellite #11
- zoom-in
Satellite #19
Satellite #20
References
- GNSS-SDR: https://gnss-sdr.org/docs/
- Live Map of Satellite Positions: https://in-the-sky.org/satmap_radar.php
- NAVSTAR GPS: https://www.n2yo.com/satellites/?c=20