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New Tools for Android GNSS Measurements GSA Raw Measurements Workshop, Prague, 26 June 2019 v1.01 Frank van Diggelen
New Tools for Android GNSS MeasurementsGSA Raw Measurements Workshop, Prague, 26 June 2019
v1.01
Frank van Diggelen
© Google 2019 2
Overview
1. Review of Android Tools 2018
2. Achievements by Developers
3. GNSS Measurements API updates 2019
4. Logging and Analysis Tools updates 2019
© Google 2019 3
Overview
1. Review of Android Tools 2018
2. Achievements by Developers
3. GNSS Measurements API updates 2019
4. Logging and Analysis Tools updates 2019
© Google 2019
Logging and Analysis Tools
4
GNSS Logger
GNSS Analysis
© Google 2019
Feature review
of 2018
5
Phone:
● Duty Cycling control
● Analysis on phone
● AGC
Desktop
● L5/E5
● Mission Planning
● C/No comparison of different phones
● Error analysis for moving receiver
● Iono & Tropo control
● Log of derived data
© Google 2019 6
Duty Cycling Analysis on Phone
Phone
AGC
© Google 2019 7
L1/L5, E1/E5 Mission Planner C/No Comparison
Error Analysis for Moving Receiver Iono, Tropo Derived Data
Desktop
© Google 2019 8
Overview
1. Review of Android Tools 2018
2. Achievements by Developers
3. GNSS Measurements API updates 2019
4. Logging and Analysis Tools updates 2019
© Google 2019
Achievements by developers, with Android GNSS
● 10,000 Downloads of Analysis Tools
● Dozens of Apps
● Hundreds of Research Papers
● Large Impact on Conferences
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© Google 2019 10
© Google 2019 11
~1,000 research papers on
“Android GNSS Raw
Measurements” since 2016.
© Google 2019
ION GNSS+ Conference
sessions mostly or entirely on Android Raw Measurements:
12
2016
2017
2019
2018
© Google 2019 13
Overview
1. Review of Android Tools 2018
2. Achievements by Developers
3. GNSS Measurements API updates 2019
4. Logging and Analysis Tools updates 2019
© Google 2018
Location APIs, Measurement APIs
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Location APIs, android.gms.location
● Places
● Geofencing
● Fused Location Provider (FLP)
● Fit
● Activity Recognition
● Nearby
Measurement/Sensor APIs, in android.location
● Location
● GnssMeasurement
● GnssClock
aka Google Play Services
Most Android phones have this (not China)
GNSS Raw Measurements
All Android phones have this
© Google 2019 15
API Changes in 2019, Android P, Pie, API level 28
GnssClock
● No changes
GnssMeasurement
ADR_STATE_HALF_CYCLE_REPORTEDADR_STATE_HALF_CYCLE_RESOLVED
STATE_2ND_CODE_LOCK
getCodeType()
hasCodeType()
© Google 2019
https://g.co/GnssToolswhich phones have GNSS Raw Measurements
16......
© Google 2019 17
Overview
1. Review of Android Tools 2018
2. Achievements by Developers
3. GNSS Measurements API updates 2019
4. Logging and Analysis Tools updates 2019
© Google 2019
Feature review
2019
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Desktop
● CustomDataFilter.m
● Kalman Filtered PVT
● ADR (carrier phase) residuals
● Built-in ephemeris unzip
New version will be released in Sep 2019,
before ION GNSS+ conference
© Google 2019
CustomDataFilter.m, example 1:
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GPS+GAL, L1L5: 1.5, 4.3 m (50%, 95%)
© Google 2019
CustomDataFilter.m, example 2:
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GPS+GAL, L1L5: 1.5, 4.3 m (50%, 95%)
GPS+GAL, L1: 1.9, 5.5 m
© Google 2019
CustomDataFilter.m, example 3:
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GPS+GAL, L1L5: 1.5, 4.3 m (50%, 95%)
GPS+GAL, L1: 1.9, 5.5 m
GPS+GAL, L5: 2.0, 6.2 m
© Google 2019
CustomDataFilter.m, example 4:
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GPS+GAL, L1L5: 1.5, 4.3 m (50%, 95%)
GPS+GAL, L1: 1.9, 5.5 m
GPS+GAL, L5: 2.0, 6.2 m
G+G, L1L5, >30dBHz: 1.5, 4.4 m
© Google 2019
ADR (accumulated delta range,
carrier phase)
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Svid 21, 39° elevation
Svid 25, 42°
Svid 29, 82°
Svid 20, 52°
Svid 12, 15°
Svid 15, 2°
Source: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis non erat sem
Summary
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● GnssLogger and Analysis Tools: useful for Research and Development
● Make use of [Write Data to File] button for getting derived data
● Use CustomDataFilter.m to experiment with subsets of data
● Use ADR for high-precision location
Proprietary + Confidential
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End,
Thank you.
