LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794 Production Information Product testing
Page 66 of 85
4.3 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.
Figure 64: 1-channel GPS simulator
u-blox recommends the following Single-Channel GPS Simulator:
Spirent GSS6100 (GPS)
Spirent GSS6300 (GPS/GLONASS)
Spirent Communications Positioning Technology www.spirent.com
4.3.1 Guidelines for sensitivity tests
1. Connect a 1-channel GPS/GLONASS 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 6 Evaluation Kit.
4.3.2 ‘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.
4.3.3 Testing LEA-6R designs
When testing the design ensure that no GPS signals are being received or delete the calibration after the
tests. Failure to do so can result in operation errors.
4.3.3.1 Direction signal
This input shall be set once to high level and once to low level. In both states the software parameters are read
back with the UBX-NAV-EKFSTATUS. The direction flag shall read forward for a high level at the FWD input and
backward for a low level at the FORWARD input.
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