GnssMeasurement

ADR_STATE_CYCLE_SLIP

public static final int ADR_STATE_CYCLE_SLIP

The state of the getAccumulatedDeltaRangeMeters() has a cycle slip detected.

Constant Value: 4 (0x00000004)

ADR_STATE_HALF_CYCLE_REPORTED

public static final int ADR_STATE_HALF_CYCLE_REPORTED

Reports whether the flag ADR_STATE_HALF_CYCLE_RESOLVED has been reported by the GNSS hardware.

When this bit is set, the value of getAccumulatedDeltaRangeUncertaintyMeters() can be low (centimeter level) whether or not the half cycle ambiguity is resolved.

When this bit is unset, the value of getAccumulatedDeltaRangeUncertaintyMeters() is larger, to cover the potential error due to half cycle ambiguity being unresolved.

Constant Value: 16 (0x00000010)

ADR_STATE_HALF_CYCLE_RESOLVED

public static final int ADR_STATE_HALF_CYCLE_RESOLVED

Reports whether the value getAccumulatedDeltaRangeMeters() has resolved the half cycle ambiguity.

When this bit is set, the getAccumulatedDeltaRangeMeters() corresponds to the carrier phase measurement plus an accumulated integer number of carrier full cycles.

When this bit is unset, the getAccumulatedDeltaRangeMeters() corresponds to the carrier phase measurement plus an accumulated integer number of carrier half cycles.

For signals that have databits, the carrier phase tracking loops typically use a costas loop discriminator. This type of tracking loop introduces a half-cycle ambiguity that is resolved by searching through the received data for known patterns of databits (e.g. GPS uses the TLM word) which then determines the polarity of the incoming data and resolves the half-cycle ambiguity.

Before the half-cycle ambiguity has been resolved it is possible that the ADR_STATE_VALID flag is set:

• In cases where ADR_STATE_HALF_CYCLE_REPORTED is not set, the ADR_STATE_HALF_CYCLE_RESOLVED flag will not be available. Here, a half wave length will be added to the returned accumulated delta range uncertainty to indicate the half cycle ambiguity.
• In cases where ADR_STATE_HALF_CYCLE_REPORTED is set, half cycle ambiguity will be indicated via both the ADR_STATE_HALF_CYCLE_RESOLVED flag and as well a half wave length added to the returned accumulated delta range uncertainty.

Constant Value: 8 (0x00000008)

ADR_STATE_RESET

public static final int ADR_STATE_RESET

The state of the getAccumulatedDeltaRangeMeters() has detected a reset.

Constant Value: 2 (0x00000002)

ADR_STATE_UNKNOWN

public static final int ADR_STATE_UNKNOWN

The state of the value getAccumulatedDeltaRangeMeters() is invalid or unknown.

Constant Value: 0 (0x00000000)

ADR_STATE_VALID

public static final int ADR_STATE_VALID

The state of the getAccumulatedDeltaRangeMeters() is valid.

Constant Value: 1 (0x00000001)

MULTIPATH_INDICATOR_DETECTED

public static final int MULTIPATH_INDICATOR_DETECTED

The measurement shows signs of multi-path.

Constant Value: 1 (0x00000001)

MULTIPATH_INDICATOR_NOT_DETECTED

public static final int MULTIPATH_INDICATOR_NOT_DETECTED

The measurement shows no signs of multi-path.

Constant Value: 2 (0x00000002)

MULTIPATH_INDICATOR_UNKNOWN

public static final int MULTIPATH_INDICATOR_UNKNOWN

The indicator is not available or the presence or absence of multipath is unknown.

Constant Value: 0 (0x00000000)

STATE_2ND_CODE_LOCK

public static final int STATE_2ND_CODE_LOCK

This GNSS measurement's tracking state has secondary code lock.

Constant Value: 65536 (0x00010000)

STATE_BDS_D2_BIT_SYNC

public static final int STATE_BDS_D2_BIT_SYNC

This Beidou measurement's tracking state has D2 bit sync.

Constant Value: 256 (0x00000100)

STATE_BDS_D2_SUBFRAME_SYNC

public static final int STATE_BDS_D2_SUBFRAME_SYNC

This Beidou measurement's tracking state has D2 sub-frame sync.

Constant Value: 512 (0x00000200)

STATE_BIT_SYNC

public static final int STATE_BIT_SYNC

This GNSS measurement's tracking state has bit sync.

Constant Value: 2 (0x00000002)

STATE_CODE_LOCK

public static final int STATE_CODE_LOCK

This GNSS measurement's tracking state has code lock.

Constant Value: 1 (0x00000001)

STATE_GAL_E1BC_CODE_LOCK

public static final int STATE_GAL_E1BC_CODE_LOCK

This Galileo measurement's tracking state has E1B/C code lock.

Constant Value: 1024 (0x00000400)

STATE_GAL_E1B_PAGE_SYNC

public static final int STATE_GAL_E1B_PAGE_SYNC

This Galileo measurement's tracking state has E1B page sync.

Constant Value: 4096 (0x00001000)

STATE_GAL_E1C_2ND_CODE_LOCK

public static final int STATE_GAL_E1C_2ND_CODE_LOCK

This Galileo measurement's tracking state has E1C secondary code lock.

Constant Value: 2048 (0x00000800)

STATE_GLO_STRING_SYNC

public static final int STATE_GLO_STRING_SYNC

This Glonass measurement's tracking state has string sync.

Constant Value: 64 (0x00000040)

STATE_GLO_TOD_DECODED

public static final int STATE_GLO_TOD_DECODED

This Glonass measurement's tracking state has time-of-day decoded.

Constant Value: 128 (0x00000080)

STATE_GLO_TOD_KNOWN

public static final int STATE_GLO_TOD_KNOWN

This Glonass measurement's tracking state has time-of-day known, possibly not decoded over the air but has been determined from other sources. If TOD decoded is set then TOD Known will also be set.

Constant Value: 32768 (0x00008000)

STATE_MSEC_AMBIGUOUS

public static final int STATE_MSEC_AMBIGUOUS

This GNSS measurement's tracking state contains millisecond ambiguity.

Constant Value: 16 (0x00000010)

STATE_SBAS_SYNC

public static final int STATE_SBAS_SYNC

This SBAS measurement's tracking state has whole second level sync.

Constant Value: 8192 (0x00002000)

STATE_SUBFRAME_SYNC

public static final int STATE_SUBFRAME_SYNC

This GNSS measurement's tracking state has sub-frame sync.

Constant Value: 4 (0x00000004)

STATE_SYMBOL_SYNC

public static final int STATE_SYMBOL_SYNC

This GNSS measurement's tracking state has symbol sync.

Constant Value: 32 (0x00000020)

STATE_TOW_DECODED

public static final int STATE_TOW_DECODED

This GNSS measurement's tracking state has time-of-week decoded.

Constant Value: 8 (0x00000008)

STATE_TOW_KNOWN

public static final int STATE_TOW_KNOWN

This GNSS measurement's tracking state has time-of-week known, possibly not decoded over the air but has been determined from other sources. If TOW decoded is set then TOW Known will also be set.

Constant Value: 16384 (0x00004000)

STATE_UNKNOWN

public static final int STATE_UNKNOWN

This GNSS measurement's tracking state is invalid or unknown.

Constant Value: 0 (0x00000000)

CREATOR

public static final Creator<GnssMeasurement> CREATOR

describeContents

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(android.os.Parcel, int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

getAccumulatedDeltaRangeMeters

public double getAccumulatedDeltaRangeMeters ()

Gets the accumulated delta range since the last channel reset, in meters.

The error estimate for this value is getAccumulatedDeltaRangeUncertaintyMeters().

The availability of the value is represented by getAccumulatedDeltaRangeState().

A positive value indicates that the SV is moving away from the receiver. The sign of getAccumulatedDeltaRangeMeters() and its relation to the sign of getCarrierPhase() is given by the equation:

          accumulated delta range = -k * carrier phase    (where k is a constant)

Similar to the concept of an RTCM "Phaserange", when the accumulated delta range is initially chosen, and whenever it is reset, it will retain the integer nature of the relative carrier phase offset between satellites observed by this receiver, such that the double difference of this value between receivers and satellites may be used, together with integer ambiguity resolution, to determine highly precise relative location between receivers.

The alignment of the phase measurement will not be adjusted by the receiver so the in-phase and quadrature phase components will have a quarter cycle offset as they do when transmitted from the satellites. If the measurement is from a combination of the in-phase and quadrature phase components, then the alignment of the phase measurement will be aligned to the in-phase component.

getAccumulatedDeltaRangeState

public int getAccumulatedDeltaRangeState ()

Gets 'Accumulated Delta Range' state.

This indicates the state of the getAccumulatedDeltaRangeMeters() measurement. See the table below for a detailed interpretation of each state.

getAccumulatedDeltaRangeUncertaintyMeters

public double getAccumulatedDeltaRangeUncertaintyMeters ()

Gets the accumulated delta range's uncertainty (1-Sigma) in meters.

The uncertainty is represented as an absolute (single sided) value.

The status of the value is represented by getAccumulatedDeltaRangeState().

getAutomaticGainControlLevelDb

public double getAutomaticGainControlLevelDb ()

This method was deprecated in API level 33.
Use GnssMeasurementsEvent#getGnssAutomaticGainControls() instead.

Gets the Automatic Gain Control level in dB.

AGC acts as a variable gain amplifier adjusting the power of the incoming signal. The AGC level may be used to indicate potential interference. Higher gain (and/or lower input power) shall be output as a positive number. Hence in cases of strong jamming, in the band of this signal, this value will go more negative. This value must be consistent given the same level of the incoming signal power.

Note: Different hardware designs (e.g. antenna, pre-amplification, or other RF HW components) may also affect the typical output of of this value on any given hardware design in an open sky test - the important aspect of this output is that changes in this value are indicative of changes on input signal power in the frequency band for this measurement.

The value is only available if hasAutomaticGainControlLevelDb() is true

getBasebandCn0DbHz

public double getBasebandCn0DbHz ()

Gets the baseband carrier-to-noise density in dB-Hz.

Typical range: 10-50 dB-Hz. The range of possible baseband C/N0 values is 0-63 dB-Hz to handle some edge cases.

The value contains the measured C/N0 for the signal at the baseband. This is typically a few dB weaker than the value estimated for C/N0 at the antenna port, which is reported in getCn0DbHz().

getCarrierCycles

public long getCarrierCycles ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeMeters() instead.

The number of full carrier cycles between the satellite and the receiver.

The reference frequency is given by the value of getCarrierFrequencyHz().

The value is only available if hasCarrierCycles() is true.

getCarrierFrequencyHz

public float getCarrierFrequencyHz ()

Gets the carrier frequency of the tracked signal.

For example it can be the GPS central frequency for L1 = 1575.45 MHz, or L2 = 1227.60 MHz, L5 = 1176.45 MHz, varying GLO channels, etc.

The value is only available if hasCarrierFrequencyHz() is true.

getCarrierPhase

public double getCarrierPhase ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeMeters() instead.

Gets the RF phase detected by the receiver.

Range: [0.0, 1.0].

This is the fractional part of the complete carrier phase measurement.

The reference frequency is given by the value of getCarrierFrequencyHz().

The error estimate for this value is getCarrierPhaseUncertainty().

The value is only available if hasCarrierPhase() is true.

getCarrierPhaseUncertainty

public double getCarrierPhaseUncertainty ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeUncertaintyMeters() instead.

Gets the carrier-phase's uncertainty (1-Sigma).

The uncertainty is represented as an absolute (single sided) value.

The value is only available if hasCarrierPhaseUncertainty() is true.

getCn0DbHz

public double getCn0DbHz ()

Gets the Carrier-to-noise density in dB-Hz.

Typical range: 10-50 dB-Hz. The range of possible C/N0 values is 0-63 dB-Hz to handle some edge cases.

The value contains the measured C/N0 for the signal at the antenna input.

getCodeType

public String getCodeType ()

Gets the GNSS measurement's code type.

Similar to the Attribute field described in RINEX 4.00, e.g., in Tables 9-16 (see https://igs.org/wg/rinex/#documents-formats).

Returns "A" for GALILEO E1A, GALILEO E6A, NavIC L5A SPS, NavIC SA SPS, GLONASS G1a L1OCd, GLONASS G2a L2CSI.

Returns "B" for GALILEO E1B, GALILEO E6B, NavIC L5B RS (D), NavIC SB RS (D), GLONASS G1a L1OCp, GLONASS G2a L2OCp, QZSS L1Sb.

Returns "C" for GPS L1 C/A, GPS L2 C/A, GLONASS G1 C/A, GLONASS G2 C/A, GALILEO E1C, GALILEO E6C, SBAS L1 C/A, QZSS L1 C/A, NavIC L5C RS (P), NavIC SC RS (P).

Returns "D" for GPS L2 (L1(C/A) + (P2-P1) (semi-codeless)), QZSS L5S(I), BDS B1C Data, BDS B2a Data, BDS B2b Data, BDS B2 (B2a+B2b) Data, BDS B3a Data, NavIC L1 Data.

Returns \u201cE\u201d for QZSS L1 C/B, QZSS L6E.

Returns "I" for GPS L5 I, GLONASS G3 I, GALILEO E5a I, GALILEO E5b I, GALILEO E5a+b I, SBAS L5 I, QZSS L5 I, BDS B1 I, BDS B2 I, BDS B3 I.

Returns "L" for GPS L1C (P), GPS L2C (L), QZSS L1C (P), QZSS L2C (L), QZSS L6P, BDS B1a Pilot.

Returns "M" for GPS L1M, GPS L2M.

Returns "N" for GPS L1 codeless, GPS L2 codeless.

Returns "P" for GPS L1P, GPS L2P, GLONASS G1P, GLONASS G2P, BDS B1C Pilot, BDS B2a Pilot, BDS B2b Pilot, BDS B2 (B2a+B2b) Pilot, BDS B3a Pilot, QZSS L5S(Q), NavIC L1 Pilot.

Returns "Q" for GPS L5 Q, GLONASS G3 Q, GALILEO E5a Q, GALILEO E5b Q, GALILEO E5a+b Q, SBAS L5 Q, QZSS L5 Q, BDS B1 Q, BDS B2 Q, BDS B3 Q.

Returns "S" for GPS L1C (D), GPS L2C (M), QZSS L1C (D), QZSS L2C (M), QZSS L6D, BDS B1a Data.

Returns "W" for GPS L1 Z-tracking, GPS L2 Z-tracking.

Returns "X" for GPS L1C (D+P), GPS L2C (M+L), GPS L5 (I+Q), GLONASS G1a L1OCd+L1OCp, GLONASS G2a L2CSI+L2OCp, GLONASS G3 (I+Q), GALILEO E1 (B+C), GALILEO E5a (I+Q), GALILEO E5b (I+Q), GALILEO E5a+b (I+Q), GALILEO E6 (B+C), SBAS L5 (I+Q), QZSS L1C (D+P), QZSS L2C (M+L), QZSS L5 (I+Q), QZSS L6 (D+P), BDS B1 (I+Q), BDS B1C Data+Pilot, BDS B2a Data+Pilot, BDS B2 (I+Q), BDS B2 (B2a+B2b) Data+Pilot, BDS B3 (I+Q), NavIC L5 (B+C), NavIC S (B+C), NavIC L1 Data+Pilot.

Returns "Y" for GPS L1Y, GPS L2Y.

Returns "Z" for GALILEO E1 (A+B+C), GALILEO E6 (A+B+C), QZSS L1S/L1-SAIF, QZSS L5S (I+Q), QZSS L6(D+E), BDS B1A Data+Pilot, BDS B2b Data+Pilot, BDS B3a Data+Pilot.

Returns "UNKNOWN" if the GNSS Measurement's code type is unknown.

The code type is used to specify the observation descriptor defined in GNSS Observation Data File Header Section Description in the RINEX standard (Version 4.00). In cases where the code type does not align with the above listed values, the code type from the most recent version of RINEX should be used. For example, if a code type "G" is added, this string shall be set to "G".

getConstellationType

public int getConstellationType ()

Gets the constellation type.

The return value is one of those constants with CONSTELLATION_ prefix in GnssStatus.

getFullInterSignalBiasNanos

public double getFullInterSignalBiasNanos ()

Gets the GNSS measurement's inter-signal bias in nanoseconds with sub-nanosecond accuracy.

This value is the sum of the estimated receiver-side and the space-segment-side inter-system bias, inter-frequency bias and inter-code bias, including:

• Receiver inter-constellation bias (with respect to the constellation in .

  Returns
  double

getFullInterSignalBiasUncertaintyNanos

public double getFullInterSignalBiasUncertaintyNanos ()

Gets the GNSS measurement's inter-signal bias uncertainty (1 sigma) in nanoseconds with sub-nanosecond accuracy.

The value is only available if hasFullInterSignalBiasUncertaintyNanos() is true.

getMultipathIndicator

public int getMultipathIndicator ()

Gets a value indicating the 'multipath' state of the event.

getPseudorangeRateMetersPerSecond

public double getPseudorangeRateMetersPerSecond ()

Gets the Pseudorange rate at the timestamp in m/s.

The error estimate for this value is getPseudorangeRateUncertaintyMetersPerSecond().

The value is uncorrected, i.e. corrections for receiver and satellite clock frequency errors are not included.

A positive 'uncorrected' value indicates that the SV is moving away from the receiver. The sign of the 'uncorrected' 'pseudorange rate' and its relation to the sign of 'doppler shift' is given by the equation:

      pseudorange rate = -k * doppler shift   (where k is a constant)

getPseudorangeRateUncertaintyMetersPerSecond

public double getPseudorangeRateUncertaintyMetersPerSecond ()

Gets the pseudorange's rate uncertainty (1-Sigma) in m/s.

The uncertainty is represented as an absolute (single sided) value.

getReceivedSvTimeNanos

public long getReceivedSvTimeNanos ()

Gets the received GNSS satellite time, at the measurement time, in nanoseconds.

The received satellite time is relative to the beginning of the system week for all constellations except for Glonass where it is relative to the beginning of the Glonass system day.

The table below indicates the valid range of the received GNSS satellite time. These ranges depend on the constellation and code being tracked and the state of the tracking algorithms given by the getState() method. The minimum value of this field is zero. The maximum value of this field is determined by looking across all of the state flags that are set, for the given constellation and code type, and finding the the maximum value in this table.

For example, for GPS L1 C/A, if STATE_TOW_KNOWN is set, this field can be any value from 0 to 1 week (in nanoseconds), and for GAL E1B code, if only STATE_GAL_E1BC_CODE_LOCK is set, then this field can be any value from 0 to 4 milliseconds (in nanoseconds.)

Note: TOW Known refers to the case where TOW is possibly not decoded over the air but has been determined from other sources. If TOW decoded is set then TOW Known must also be set.

Note well: if there is any ambiguity in integer millisecond, STATE_MSEC_AMBIGUOUS must be set accordingly, in the 'state' field. This value must be populated, unless the 'state' == STATE_UNKNOWN.

Note on optional flags:

• For L1 C/A and B1I, STATE_SYMBOL_SYNC is optional since the symbol length is the same as the bit length.
• For L5Q and E5aQ, STATE_BIT_SYNC and STATE_SYMBOL_SYNC are optional since they are implied by STATE_CODE_LOCK.
• STATE_2ND_CODE_LOCK for L5I is optional since it is implied by STATE_SYMBOL_SYNC.
• STATE_2ND_CODE_LOCK for E1C is optional since it is implied by STATE_GAL_E1C_2ND_CODE_LOCK.
• For E1B and E1C, STATE_SYMBOL_SYNC is optional, because it is implied by STATE_GAL_E1BC_CODE_LOCK.

getReceivedSvTimeUncertaintyNanos

public long getReceivedSvTimeUncertaintyNanos ()

Gets the error estimate (1-sigma) for the received GNSS time, in nanoseconds.

getSatelliteInterSignalBiasNanos

public double getSatelliteInterSignalBiasNanos ()

Gets the GNSS measurement's satellite inter-signal bias in nanoseconds with sub-nanosecond accuracy.

This value is the space-segment-side inter-system bias, inter-frequency bias and inter-code bias, including:

• Master clock bias (e.g., GPS-GAL Time Offset (GGTO), GPS-UTC Time Offset (TauGps), BDS-GLO Time Offset (BGTO))(with respect to the constellation in .

  Returns
  double

getSatelliteInterSignalBiasUncertaintyNanos

public double getSatelliteInterSignalBiasUncertaintyNanos ()

Gets the GNSS measurement's satellite inter-signal bias uncertainty (1 sigma) in nanoseconds with sub-nanosecond accuracy.

The value is only available if hasSatelliteInterSignalBiasUncertaintyNanos() is true.

getSnrInDb

public double getSnrInDb ()

Gets the (post-correlation & integration) Signal-to-Noise ratio (SNR) in dB.

The value is only available if hasSnrInDb() is true.

getState

public int getState ()

Gets per-satellite-signal sync state.

It represents the current sync state for the associated satellite signal.

This value helps interpret getReceivedSvTimeNanos().

getSvid

public int getSvid ()

Gets the satellite ID.

Interpretation depends on getConstellationType(). See GnssStatus#getSvid(int).

getTimeOffsetNanos

public double getTimeOffsetNanos ()

Gets the time offset at which the measurement was taken in nanoseconds.

The reference receiver's time from which this is offset is specified by GnssClock#getTimeNanos().

The sign of this value is given by the following equation:

      measurement time = TimeNanos + TimeOffsetNanos

The value provides an individual time-stamp for the measurement, and allows sub-nanosecond accuracy.

hasAutomaticGainControlLevelDb

public boolean hasAutomaticGainControlLevelDb ()

This method was deprecated in API level 33.
Use GnssMeasurementsEvent#getGnssAutomaticGainControls() instead.

Returns true if getAutomaticGainControlLevelDb() is available, false otherwise.

hasBasebandCn0DbHz

public boolean hasBasebandCn0DbHz ()

Returns true if getBasebandCn0DbHz() is available, false otherwise.

hasCarrierCycles

public boolean hasCarrierCycles ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeState() instead.

Returns true if getCarrierCycles() is available, false otherwise.

hasCarrierFrequencyHz

public boolean hasCarrierFrequencyHz ()

Returns true if getCarrierFrequencyHz() is available, false otherwise.

hasCarrierPhase

public boolean hasCarrierPhase ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeState() instead.

Returns true if getCarrierPhase() is available, false otherwise.

hasCarrierPhaseUncertainty

public boolean hasCarrierPhaseUncertainty ()

This method was deprecated in API level 28.
use getAccumulatedDeltaRangeState() instead.

Returns true if getCarrierPhaseUncertainty() is available, false otherwise.

hasCodeType

public boolean hasCodeType ()

Returns true if getCodeType() is available, false otherwise.

hasFullInterSignalBiasNanos

public boolean hasFullInterSignalBiasNanos ()

Returns true if getFullInterSignalBiasNanos() is available, false otherwise.

hasFullInterSignalBiasUncertaintyNanos

public boolean hasFullInterSignalBiasUncertaintyNanos ()

Returns true if getFullInterSignalBiasUncertaintyNanos() is available, false otherwise.

hasSatelliteInterSignalBiasNanos

public boolean hasSatelliteInterSignalBiasNanos ()

Returns true if getSatelliteInterSignalBiasNanos() is available, false otherwise.

hasSatelliteInterSignalBiasUncertaintyNanos

public boolean hasSatelliteInterSignalBiasUncertaintyNanos ()

Returns true if getSatelliteInterSignalBiasUncertaintyNanos() is available, false otherwise.

hasSnrInDb

public boolean hasSnrInDb ()

Returns true if getSnrInDb() is available, false otherwise.

toString

public String toString ()

Returns a string representation of the object.

writeToParcel

public void writeToParcel (Parcel parcel, 
                int flags)

Flatten this object in to a Parcel.