Looks alright. Multi GNSS that's well-engineered can be far more effective than using one system. The trick will be assuring the same geo model and accounting for the differences in calibrated time. Pseudo-wavelength counting is essential but also it requires that the satellites good, relativistically-corrected time sources by time-of-flight visual confirmation calibration of position and velocity.
[pdf] https://www.opsjournal.org/DocumentLibrary/Uploads/Mudrak_ar...