GnssClock
class GnssClock : Parcelable
| kotlin.Any | |
| ↳ | android.location.GnssClock |
A class containing a GNSS clock timestamp.
It represents a measurement of the GNSS receiver's clock.
Summary
| Inherited constants | |
|---|---|
| Public methods | |
|---|---|
| Int | |
| Double |
Gets the clock's sub-nanosecond bias. |
| Double |
Gets the clock's Bias Uncertainty (1-Sigma) in nanoseconds. |
| Double |
Gets the clock's Drift in nanoseconds per second. |
| Double |
Gets the clock's Drift Uncertainty (1-Sigma) in nanoseconds per second. |
| Long |
Returns the elapsed real-time of this clock since system boot, in nanoseconds. |
| Double |
Gets the estimate of the relative precision of the alignment of the |
| Long |
Gets the difference between hardware clock ( |
| Int |
Gets count of hardware clock discontinuities. |
| Int |
Gets the leap second associated with the clock's time. |
| Double |
Returns the reference carrier frequency in Hz for inter-signal bias. |
| String |
Returns the reference code type for inter-signal bias. |
| Int |
Returns the reference constellation type for inter-signal bias. |
| Long |
Gets the GNSS receiver internal hardware clock value in nanoseconds. |
| Double |
Gets the clock's time Uncertainty (1-Sigma) in nanoseconds. |
| Boolean |
Returns |
| Boolean |
Returns |
| Boolean |
Returns |
| Boolean |
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| Boolean |
Returns |
| Boolean |
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| Boolean |
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| Boolean |
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| Boolean |
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| Boolean |
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| Boolean |
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| Boolean |
Returns |
| String |
toString() |
| Unit |
writeToParcel(parcel: Parcel, flags: Int) |
| Properties | |
|---|---|
| static Parcelable.Creator<GnssClock!> | |
Public methods
describeContents
fun describeContents(): Int
| Return | |
|---|---|
Int |
a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either 0 or android.os.Parcelable#CONTENTS_FILE_DESCRIPTOR |
getBiasNanos
fun getBiasNanos(): Double
Gets the clock's sub-nanosecond bias.
See the description of how this field is part of converting from hardware clock time, to GPS time, in getFullBiasNanos().
The error estimate for the sum of this field and getFullBiasNanos is getBiasUncertaintyNanos().
The value is only available if hasBiasNanos() is true.
getBiasUncertaintyNanos
fun getBiasUncertaintyNanos(): Double
Gets the clock's Bias Uncertainty (1-Sigma) in nanoseconds.
See the description of how this field provides the error estimate in the conversion from hardware clock time, to GPS time, in getFullBiasNanos().
The value is only available if hasBiasUncertaintyNanos() is true.
| Return | |
|---|---|
Double |
Value is 0.0f or greater |
getDriftNanosPerSecond
fun getDriftNanosPerSecond(): Double
Gets the clock's Drift in nanoseconds per second.
This value is the instantaneous time-derivative of the value provided by getBiasNanos().
A positive value indicates that the frequency is higher than the nominal (e.g. GPS master clock) frequency. The error estimate for this reported drift is getDriftUncertaintyNanosPerSecond().
The value is only available if hasDriftNanosPerSecond() is true.
getDriftUncertaintyNanosPerSecond
fun getDriftUncertaintyNanosPerSecond(): Double
Gets the clock's Drift Uncertainty (1-Sigma) in nanoseconds per second.
The value is only available if hasDriftUncertaintyNanosPerSecond() is true.
| Return | |
|---|---|
Double |
Value is 0.0f or greater |
getElapsedRealtimeNanos
fun getElapsedRealtimeNanos(): Long
Returns the elapsed real-time of this clock since system boot, in nanoseconds.
The value is only available if hasElapsedRealtimeNanos() is true.
getElapsedRealtimeUncertaintyNanos
fun getElapsedRealtimeUncertaintyNanos(): Double
Gets the estimate of the relative precision of the alignment of the getElapsedRealtimeNanos() timestamp, with the reported measurements in nanoseconds (68% confidence).
The value is only available if hasElapsedRealtimeUncertaintyNanos() is true.
| Return | |
|---|---|
Double |
Value is 0.0f or greater |
getFullBiasNanos
fun getFullBiasNanos(): Long
Gets the difference between hardware clock (getTimeNanos()) inside GPS receiver and the true GPS time since 0000Z, January 6, 1980, in nanoseconds.
This value is available if the receiver has estimated GPS time. If the computed time is for a non-GPS constellation, the time offset of that constellation to GPS has to be applied to fill this value. The value is only available if hasFullBiasNanos() is true.
The error estimate for the sum of this field and getBiasNanos is getBiasUncertaintyNanos().
The sign of the value is defined by the following equation:
local estimate of GPS time = TimeNanos - (FullBiasNanos + BiasNanos)
getHardwareClockDiscontinuityCount
fun getHardwareClockDiscontinuityCount(): Int
Gets count of hardware clock discontinuities.
When this value stays the same, vs. a value in a previously reported GnssClock, it can be safely assumed that the TimeNanos value has been derived from a clock that has been running continuously - e.g. a single continuously powered crystal oscillator, and thus the (FullBiasNanos + BiasNanos) offset can be modelled with traditional clock bias & drift models.
Each time this value changes, vs. the value in a previously reported GnssClock, that suggests the hardware clock may have experienced a discontinuity (e.g. a power cycle or other anomaly), so that any assumptions about modelling a smoothly changing (FullBiasNanos + BiasNanos) offset, and a smoothly growing (TimeNanos) between this and the previously reported GnssClock, should be reset.
getLeapSecond
fun getLeapSecond(): Int
Gets the leap second associated with the clock's time.
The sign of the value is defined by the following equation:
UtcTimeNanos = TimeNanos - (FullBiasNanos + BiasNanos) - LeapSecond * 1,000,000,000
The value is only available if hasLeapSecond() is true.
getReferenceCarrierFrequencyHzForIsb
fun getReferenceCarrierFrequencyHzForIsb(): Double
Returns the reference carrier frequency in Hz for inter-signal bias.
The value is only available if hasReferenceCarrierFrequencyHzForIsb() is true.
| Return | |
|---|---|
Double |
Value is 0.0 or greater |
getReferenceCodeTypeForIsb
fun getReferenceCodeTypeForIsb(): String
Returns the reference code type for inter-signal bias.
The value is only available if hasReferenceCodeTypeForIsb() is true.
The return value is one of those constants defined in GnssMeasurement#getCodeType().
| Return | |
|---|---|
String |
This value cannot be null. |
getReferenceConstellationTypeForIsb
fun getReferenceConstellationTypeForIsb(): Int
Returns the reference constellation type for inter-signal bias.
The value is only available if hasReferenceConstellationTypeForIsb() is true.
The return value is one of those constants with CONSTELLATION_ prefix in GnssStatus.
getTimeNanos
fun getTimeNanos(): Long
Gets the GNSS receiver internal hardware clock value in nanoseconds.
This value is expected to be monotonically increasing while the hardware clock remains powered on. For the case of a hardware clock that is not continuously on, see the getHardwareClockDiscontinuityCount field. The GPS time can be derived by subtracting the sum of getFullBiasNanos() and getBiasNanos() (when they are available) from this value. Sub-nanosecond accuracy can be provided by means of getBiasNanos().
The error estimate for this value (if applicable) is getTimeUncertaintyNanos().
getTimeUncertaintyNanos
fun getTimeUncertaintyNanos(): Double
Gets the clock's time Uncertainty (1-Sigma) in nanoseconds.
The uncertainty is represented as an absolute (single sided) value.
The value is only available if hasTimeUncertaintyNanos() is true.
This value is often effectively zero (it is the reference clock by which all other times and time uncertainties are measured), and thus this field may often be 0, or not provided.
| Return | |
|---|---|
Double |
Value is 0.0f or greater |
hasBiasNanos
fun hasBiasNanos(): Boolean
Returns true if getBiasNanos() is available, false otherwise.
hasBiasUncertaintyNanos
fun hasBiasUncertaintyNanos(): Boolean
Returns true if getBiasUncertaintyNanos() is available, false otherwise.
hasDriftNanosPerSecond
fun hasDriftNanosPerSecond(): Boolean
Returns true if getDriftNanosPerSecond() is available, false otherwise.
hasDriftUncertaintyNanosPerSecond
fun hasDriftUncertaintyNanosPerSecond(): Boolean
Returns true if getDriftUncertaintyNanosPerSecond() is available, false otherwise.
hasElapsedRealtimeNanos
fun hasElapsedRealtimeNanos(): Boolean
Returns true if getElapsedRealtimeNanos() is available, false otherwise.
hasElapsedRealtimeUncertaintyNanos
fun hasElapsedRealtimeUncertaintyNanos(): Boolean
Returns true if getElapsedRealtimeUncertaintyNanos() is available, false otherwise.
hasFullBiasNanos
fun hasFullBiasNanos(): Boolean
Returns true if getFullBiasNanos() is available, false otherwise.
hasLeapSecond
fun hasLeapSecond(): Boolean
Returns true if getLeapSecond() is available, false otherwise.
hasReferenceCarrierFrequencyHzForIsb
fun hasReferenceCarrierFrequencyHzForIsb(): Boolean
Returns true if getReferenceCarrierFrequencyHzForIsb() is available, false otherwise.
hasReferenceCodeTypeForIsb
fun hasReferenceCodeTypeForIsb(): Boolean
Returns true if getReferenceCodeTypeForIsb() is available, false otherwise.
hasReferenceConstellationTypeForIsb
fun hasReferenceConstellationTypeForIsb(): Boolean
Returns true if getReferenceConstellationTypeForIsb() is available, false otherwise.
hasTimeUncertaintyNanos
fun hasTimeUncertaintyNanos(): Boolean
Returns true if getTimeUncertaintyNanos() is available, false otherwise.
toString
fun toString(): String
| Return | |
|---|---|
String |
a string representation of the object. |
writeToParcel
fun writeToParcel(
parcel: Parcel,
flags: Int
): Unit
| Parameters | |
|---|---|
dest |
The Parcel in which the object should be written. This value cannot be null. |
flags |
Int: Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE. Value is either 0 or a combination of android.os.Parcelable#PARCELABLE_WRITE_RETURN_VALUE, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES |