Description:
How to identify GPS Fix absence
Required information:
Information needed in order to perform the task (plus who needs to provide it)
LEDs indication | Customer |
OR | |
View of device center "Troubleshooting" | Customer |
OR | |
SMS command coords response | Customer or if our SIM is in use we can get by ourselves |
Recommended tools:
Application | Download link |
Ruptela documentation page | |
Device Center | |
Admin panel (LCM) for SMS sending |
Steps:
1. GPS Fix state identification during installation. GPS Fix state can be indicated by observing LED Pattern (Blinking):
If LED indicates that issue is with GNSS, it is needed to follow the steps provided in the article: How to improve GNSS acquisition and accuracy
2. GPS Fix identification using device center/advanced configurator - when a device is tested using a PC, or the device is on a table:
The device should be connected to the external power supply and placed in an open place or near the window where the GNSS signal would be available. The further steps are performed as described in device testing using the device center: Device Testing
If there are issues with GNSS, the device's overall status will be shown in red:
By pressing "Troubleshoot" You will see described issue:
It is needed to follow the steps provided in the article: How to improve GNSS acquisition and accuracy
3. GPS Fix state identification by SMS command:
When a device is already installed and can not be physically checked, you need to send an SMS: SMSpassword coords
SMS sending using Admin panel:
Response example: 2018-11-29 22:33, lat. 0.0000000, long. 0.0000000, alt. 0.0, sat. 0, dir. 0.00, hdop 0, state 2
Important fields to check:
Time - Current GMT date & time. The device will generate records only if it has a current timestamp. The timestamp is presented in GMT+0. If time starts with 1970... – there was no GPS fix established after the device restarted. Make sure that the GPS antenna (labeled face of the device) is facing a clear sky and without metallic obstructions in between.
Sat. - Number of satellites linked to the device at each moment. The Minimum is 3, but for accurate positioning at least 5 are necessary.
hdop - Positioning distortion. The lower the better, only values lower than 150 are considered acceptable for accurate positioning.
State - Current GPS/GLONASS state: 1-off, 2-on no fix, 3-on got the fix, 4-not responding, 5-sleep, 6- disabled.
If issues are spotted follow steps provided in the article: How to improve GNSS acquisition and accuracy