ZOE-M8 series - Hardware integration manual
UBX-16030136 - R09
Product testing
Page 27 of 34
Production information
4
Product testing
4.1
Test parameters for the OEM manufacturer
Because of the testing done by u-blox, an OEM manufacturer does not need to repeat firmware tests
or measurements of the GNSS parameters/characteristics (for example, 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
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 device under test (DUT) and allow enough time for the acquisition.
4.
Read the C/N0 value from the NMEA GSV or the UBX-NAV-SVINFO message (using, for example,
u-center).
5.
Compare the results to a “Golden Device” or the u-blox EVK-M8GZOE 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.
Figure 20: Multi-GNSS generator
