AMY-5M - Hardware Integration Manual
GPS.G5-MS5-08207-A3
Preliminary
Product testing
Page 42 of 54
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 GPS parameters/characteristics (e.g. TTFF) in their production test.
During production OEM manufacturers should focus on:
Communication to a host controller
Overall sensitivity of the device - including antenna, if applicable - see section 4.2 (particularly section
4.2.1) for recommended production test procedures.
For further u-blox production test recommendations please contact u-blox Customer Support.
4.2
System sensitivity test
The best way to test the sensitivity of a GPS device is
with the use of a 1-channel GPS simulator. It assures
reliable and constant signals at every measurement.
u-blox recommends the following Single-Channel GPS
Simulator:
Spirent GSS6100
Spirent Communications Positioning Technology
www.positioningtechnology.co.uk
Figure 29: 1-channel GPS simulator
4.2.1
Guidelines for sensitivity tests
1.
Connect a 1-channel GPS simulator 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/No 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 a u-blox 5 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.