Dual estimator 1 Dual frequency 1 Dual phase 1 Dual phasis 1 Dual-frequency combination 1 Dual-phase estimator 1 Frequency combinations 1 Frequency estimation 1 GNSS meta-signal Global Navigation Satellite Systems 1 Global navigation satellite system meta-signal 1 Global positioning system 1 Phase estimators 1 Signal reconstruction 1 dual estimator 1 dual-frequency combinations 1 dual-phase estimator 1