Abstract: Method of measuring ionosphere scintillation phase index Sigma-Phi, the method including, for each of N satellites being tracked, calculating a phase prediction at an i-th sample; for each of the N satellites, calculating an individual loop discriminator signal based on the phase prediction; rejecting the i-th samples of some of the N satellites, where K non-rejected satellites remain; calculating common loop discriminator signal based on the individual loop discriminator signals of non-rejected K satellites; calculating a phase estimate and a Doppler frequency estimate at the i-th sample for each of the N satellites based on individual loop discriminator signal; calculating test statistic based on the phase estimate at the i-th sample and an observed phase for each of the N satellites; calculating index Sigma-Phi as standard deviation estimation of the test statistic for each of the N satellites; and outputting the index Sigma-Phi for each of the N satellites.

Abstract: GNSS receiver which includes RF front end, connected to GNSS antenna, an ADC converting the satellite signals into digitized signals, a digital section, including a processor receiving the digitized signals, forming raw measurements with pseudoranges measured between the antenna and satellites, and estimating target parameters, including receiver position and receiver time offset by (i) extrapolating the target parameters from previous epoch to current epoch using a dynamic model; (ii) computing a quasi-measurement for each satellite based on extrapolated target parameters and GNSS satellite positions; (iii) detecting and rejecting raw measurements with anomalous errors by testing differences between the raw measurements and respective quasi-measurements against predefined thresholds; (iv) substituting quasi-measurements for rejected raw measurements; (v) estimating target parameters using unrejected raw measurements and substituted quasi-measurements; (vi) outputting estimated target parameters.

Abstract: GNSS receiver which includes RF front end, connected to GNSS antenna, an ADC converting the satellite signals into digitized signals, a digital section, including a processor receiving the digitized signals, forming raw measurements with pseudoranges measured between the antenna and satellites, and estimating target parameters, including receiver position and receiver time offset by (i) extrapolating the target parameters from previous epoch to current epoch using a dynamic model; (ii) computing a quasi-measurement for each satellite based on extrapolated target parameters and GNSS satellite positions; (iii) detecting and rejecting raw measurements with anomalous errors by testing differences between the raw measurements and respective quasi-measurements against predefined thresholds; (iv) substituting quasi-measurements for rejected raw measurements; (v) estimating target parameters using unrejected raw measurements and substituted quasi-measurements; (vi) outputting estimated target parameters.