MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1
Product testing
Page 52 of 55
6.3
System sensitivity test
The best way to test the sensitivity of a GPS/GNSS device is with the use of a 1-channel GPS simulator. It assures
reliable and constant signals at every measurement.
Figure 44: 1-channel GPS simulator
u-blox recommends the following Single-Channel GPS Simulator:
•
Spirent GSS6100 (GPS)
•
Spirent GSS6300 (GPS/GLONASS)
Spirent Communications Positioning Technology
6.3.1
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 7 Evaluation Kit.
6.3.2
‘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.
