EVA-M8M - Hardware Integration Manual
UBX-14006179 - R02
Early Production Information
Product
testing
Page 29 of 45
4
Product testing
4.1
Test parameters for OEM manufacturer
Because of the testing done by u-blox, it is obvious that an OEM manufacturer doesn’t need to repeat firmware
tests or measurements of the GNSS parameters/characteristics (e.g. TTFF) in their production test.
An OEM manufacturer should focus on:
•
Overall sensitivity of the device (including antenna, if applicable)
•
Communication to a host controller
4.2
System sensitivity test
The best way to test the sensitivity of a GNSS device is
with the use of a Multi-GNSS generator. It assures
reliable and constant signals at every measurement.
u-blox recommends the following Multi-GNSS
generator:
•
Spirent GSS6300
Spirent Communications Positioning Technology
www.positioningtechnology.co.uk
Figure 12: Multi-GNSS generator
4.2.1
Guidelines for sensitivity tests
1.
Connect a Multi-GNSS generator to the OEM product.
2.
Choose the power level in a way that the “Golden Device” would report a C/No ratio of 38-40 dBHz.
3.
Power up the DUT (Device Under Test) and allow enough time for the acquisition.
4.
Read the C/N0 value from the NMEA GSV or the UBX-NAV-SVINFO message (e.g. with u-center).
5.
Compare the results to a “Golden Device” or the u-blox EVK-M8EVA Evaluation Kit.
4.2.2
‘Go/No go’ tests for integrated devices
The best test is to bring the device to an outdoor position
with excellent sky view
(HDOP < 3.0). Let the
receiver acquire satellites and compare the signal strength with a “Golden Device”.
As the electro-magnetic field of a redistribution antenna is not homogenous, indoor tests are in most
cases not reliable. These kind of tests may be useful as a ‘go/no go’ test but not for sensitivity
measurements.
