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Question is as simple as the title: How to measure GPS signal strength?
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You should open the Phone app, tap on the Compose button and insert *#*#4636#**, *#0*# or #7378423#** depending on the Smartphone model and manufacturer. Once you gained access to the menu you should tap on the Sensor Test/Phone Info/Service Test depending on the available terminal and select the GPS test option.
To proceed, launch the Phone app, tap the Compose button on the keypad (note that the wording may be slightly different depending on the brand and model of device in use and the version of Android installed on it) and type in the code *#*#4636#**.
The recommended signal level for GPS testing is -90 dBm. The expected SNR with this signal level is normally more than 16 dB.
Are you sure you mean signal strength vs. accuracy? What good is the signal strength? Since the GPS position is determined via many satellites, you don't have "one" signal strength.
So assuming that you really mean signal strength, you can get the GpsStatus via LocationManager.getGpsStatus(), and that gives you a list of satellites via getSatellites()', and each one of those has a signal-to-noise ratio (getSnr()).
Assuming you mean accuracy, try Location.getAccuracy().
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