Merge "Add additional doc for SatellitePvt" into sc-dev am: 88385cc1f0 (9847065c) · Commits · e / os / android_frameworks_base

location/java/android/location/SatellitePvt.java

+33 −1

Original line number	Diff line number	Diff line
		@@ -28,6 +28,19 @@ import android.os.Parcelable;
		* same signal transmission time {@link GnssMeasurement#getReceivedSvTimeNanos()}.
		*
		* <p>The position and velocity must be in ECEF coordinates.
		*
		* <p>If {@link GnssMeasurement#getSatellitePvt()} is derived from Broadcast ephemeris, then the
		* position is already w.r.t. the antenna phase center. However, if
		* {@link GnssMeasurement#getSatellitePvt()} is derived from other modeled orbits, such as
		* long-term orbits, or precise orbits, then the orbits may have been computed w.r.t.
		* the satellite center of mass, and then GNSS vendors are expected to correct for the effect
		* on different phase centers (can differ by meters) of different GNSS signals (e.g. L1, L5)
		* on the reported satellite position. Accordingly, we might observe a different satellite
		* position reported for L1 GnssMeasurement struct compared to L5 GnssMeasurement struct.
		*
		* <p>If {@link GnssMeasurement#getReceivedSvTimeNanos()} is not fully decoded,
		* {@link GnssMeasurement#getSatellitePvt()} could still be reported and
		* {@link GnssMeasurement#getReceivedSvTimeUncertaintyNanos()} would be used to provide confidence.
		* @hide
		*/
		@SystemApi
		@@ -203,7 +216,7 @@ public final class SatellitePvt implements Parcelable {
		/**
		* Returns the signal in Space User Range Error Rate (URE Rate) (meters per second).
		*
		* It covers satellite velocity error and Satellite clock drift
		* <p>It covers satellite velocity error and Satellite clock drift
		* projected to the pseudorange rate measurements.
		*/
		@FloatRange(from = 0.0f, fromInclusive = false)
		@@ -272,6 +285,14 @@ public final class SatellitePvt implements Parcelable {
		/**
		* Returns the satellite hardware code bias of the reported code type w.r.t
		* ionosphere-free measurement in meters.
		*
		* <p>When broadcast ephemeris is used, this is the offset caused
		* by the satellite hardware delays at different frequencies;
		* e.g. in IS-GPS-705D, this term is described in Section
		* 20.3.3.3.1.2.1.
		*
		* <p>For GPS this term is ~10ns, and affects the satellite position
		* computation by less than a millimeter.
		*/
		@FloatRange()
		public double getHardwareCodeBiasMeters() {
		@@ -282,6 +303,17 @@ public final class SatellitePvt implements Parcelable {
		* Returns the satellite time correction for ionospheric-free signal measurement
		* (meters). The satellite clock correction for the given signal type
		* = satTimeCorrectionMeters - satHardwareCodeBiasMeters.
		*
		* <p>When broadcast ephemeris is used, this is the offset modeled in the
		* clock terms broadcast over the air by the satellites;
		* e.g. in IS-GPS-200H, Section 20.3.3.3.3.1, this term is
		* ∆tsv = af0 + af1(t - toc) + af2(t - toc)^2 + ∆tr.
		*
		* <p>If another source of ephemeris is used for SatellitePvt, then the
		* equivalent value of satTimeCorrection must be provided.
		*
		* <p>For GPS this term is ~1ms, and affects the satellite position
		* computation by ~1m.
		*/
		@FloatRange()
		public double getTimeCorrectionMeters() {