gps-details

Telit LE910C1

Author: Michael George

Created: 8 August 2024

Observations

Airoha

Weird speeds from Matteo (blue) during periods of acceleration look like the Airoha chipset, or past issue of Garmin / COROS.

Race link - https://app.metasail.it/(S(sedvdlugur5dncdagpz4iyo3))/ViewRecordedRace2022.aspx?idgara=32233&token=1CKA

Perhaps newer versions of the LE910C1 use an Airoha chip?

Press releases about Telit Cinterion and Airoha:

• Telit Cinterion Adds New Dual-Band GNSS Positioning Modules Featuring the AIROHA AG3335 Chipset Family - Mar 2023
  • SE868K5 family of dual-band GNSS positioning modules

Speed Accuracy

It is also noticeable that speed accuracy is shown by Metasail, but the origin of it is unknown.

Reference

• LE910Cx/ME910C1/ML865C1/NE910C1 A-GPS Application Note - see AT$GPSACP

AT commands

• LE910Cx AT Command Reference - 80502ST10950A Rev.9.0 - 2020-09-25
  • LE910Cx-EU lists AT$GPSQOS in section 4.1
  • 5.6.13.3. Get Acquired Position - $GPSACP
  • 5.6.13.12. GPS Quality of Service - $GPSQOS
  • 5.6.13.36. Get Current Location - $GETLOCATION includes HEPE
  • 5.6.13.38. GNSS Navigation Update Rate Configuration - $GPSNHZ (default = 1000 ms)

AT$GPSQOS

Page on Techship describes AT$GPSQOS for the LM960A18

You can change the GPS quality of service (QoS). This is done by the AT command AT$GPSQOS. To see what curren QoS parameters that are set enter AT$GPSQOS? and to see the supported values enter AT$GPSQOS=?. For exemple you can enter the following to get low horizontal and vertical accuracy and a low response time. This is greatly further explained in chapter 5.6.2.9 in the AT commands guide. AT$GPSQOS=1800000,990,150,0,0,0

For further explanations of the AT commands look at chapter 5.6.2 in the AT command guide, found under “Technical Documentation” on the product page https://techship.com/products/telit-lm960a18-lte-cat-18-mpcie/