PAM-7Q - Hardware Integration Manual
UBX-13003143 - R06
Early Production Information
Product testing
Page 22 of 26
6.3
System sensitivity test
The best way to test the sensitivity of a GNSS device is with the use of a 1-channel GNSS simulator. It assures
reliable and constant signals at every measurement.
Figure 13: 1-channel GNSS simulator
u-blox recommends the following Single-Channel GNSS Simulator:
Spirent GSS6100 (GPS)
Spirent GSS6300 (GPS/GLONASS)
Spirent Communications Positioning Technology
6.3.1
Guidelines for sensitivity tests
1.
Connect a 1-channel GNSS simulator to the OEM product via an antenna.
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 PAM-7Q 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.
