AT+QGPSLOC=2 responds with out of range HDOP value

IoT Modules LTE Standard Module
1

Hi all,

we are using the EC21-EUX LTE Modem with FW A07. We use GNSS by polling the position with “AT+QGPSLOC=2”. Occasionally the modem responds with an HDOP-Value of 500.0.

Example (i replaced my location with X):
+QGPSLOC: 144349.0,5X.XXXXX,1X.XXXXX,500.0,201.4,2,84.34,0.0,0.0,101024,02

EC2x&EG9x&EG2x-G&EM05 Series GNSS Application Note Version 1.3 states on page 29 that this value should be between 0.5 and 99.9, not 500.0. What is causing the modem to send a 500.0 value? Can I assume that all other values in the string are still valid when HDOP is 500.0?

2

Hi @Flint
The value that exceeds the range is invalid. The value was read directly from the obtained NMEA clock. It is recommended to discard the outlier or recalibrate the GNSS system.