Method Detail

• calculatePseudorange

  @RequiresApi(value = 24) final Pair<Double, Double> calculatePseudorange(GnssMeasurement measurement, GnssClock clock, Double minCn0DbHz)

  Calculate pseudorange from GNSS measurement and clock.

  Parameters:

  measurement - GnssMeasurement from Android API

  clock - GnssClock from Android API

  minCn0DbHz - Minimum CN0 (dB-Hz) the measurement must meet to be eligible

• isMeasurementValid

  @RequiresApi(value = 24) final Boolean isMeasurementValid(GnssMeasurement measurement, Double minCn0DbHz)

  Check if a measurement is valid for pseudorange calculation.

  Requirements:

  • Code lock acquired

  • Time reference decoded (TOW for GPS/Galileo/BeiDou, TOD for GLONASS, or known from previous fix)

  • Sufficient signal strength (CN0)

• calculateGpsTime

  @RequiresApi(value = 24) final Double calculateGpsTime(GnssMeasurement measurement, GnssClock clock)

  Calculate GPS time from measurement and clock.

  Parameters:

  measurement - GnssMeasurement

  clock - GnssClock

• calculateGpsWeekAndTow

  @RequiresApi(value = 24) final Pair<Integer, Double> calculateGpsWeekAndTow(GnssClock clock)

  Calculate GPS week and time-of-week from clock.

  Parameters:

  clock - GnssClock

• calculatePseudorangeRate

  @RequiresApi(value = 24) final Pair<Double, Double> calculatePseudorangeRate(GnssMeasurement measurement)

  Calculate pseudorange rate (Doppler-derived velocity). This is directly available from GnssMeasurement.

  Parameters:

  measurement - GnssMeasurement

• calculateCarrierPhase

  @RequiresApi(value = 24) final Double calculateCarrierPhase(GnssMeasurement measurement)

  Calculate carrier phase if available. Carrier phase is more accurate than code phase for positioning.

  Parameters:

  measurement - GnssMeasurement

• calculateAccumulatedDeltaRange

  @RequiresApi(value = 24) final Pair<Double, Double> calculateAccumulatedDeltaRange(GnssMeasurement measurement)

  Calculate accumulated delta range (integrated carrier phase). Useful for precise positioning.

  Parameters:

  measurement - GnssMeasurement

• isAccumulatedDeltaRangeValid

  @RequiresApi(value = 24) final Boolean isAccumulatedDeltaRangeValid(GnssMeasurement measurement)

  Check if accumulated delta range state is valid. Valid ADR can be used for carrier phase positioning.

• calculateGeometricRange

   final Double calculateGeometricRange(Vector3D satPos, Vector3D userPos)

  Calculate geometric range from satellite position to user position. Used for residual calculation and quality control.

  Parameters:

  satPos - Satellite position ECEF (meters)

  userPos - User position ECEF (meters)

• calculatePseudorangeResidual

   final Double calculatePseudorangeResidual(Double measuredPseudorange, Double geometricRange, Double receiverClockBias, Double satelliteClockBias)

  Calculate pseudorange residual. Residual = measured pseudorange - (geometric range + clock bias + satellite clock error)

  Parameters:

  measuredPseudorange - Measured pseudorange in meters

  geometricRange - Calculated geometric range in meters

  receiverClockBias - Receiver clock bias in meters

  satelliteClockBias - Satellite clock bias in seconds

• getMeasurementQuality

  @RequiresApi(value = 24) final PseudorangeCalculator.MeasurementQuality getMeasurementQuality(GnssMeasurement measurement)

  Get quality metrics for a measurement.