Conducted testing can be done where there is a direct antenna connection available on the device under test. In this case the simulator RF output is connected directly to the antenna input or, in some cases, via fixed passive attenuators to further reduce the signal level.
Which LabSat should I use?
All LabSat models can be used for conducted testing. The GNSS capabilities of the device under test (DUT) will determine which model is most suited.
If your DUT supports signals outside of the L1 frequency band, for example GPS L5, then LabSat 3 Wideband is the model required.
If your DUT only operates within the L1 frequency band, we recommend LabSat 3 for this test.
If your DUT requires a real time (current timestamp) RF signal, LabSat Real-Time or Real-Time+ would be the only suitable model.
Overview
When testing a product which contains an integrated GNSS system, the aim is not usually to test the core GNSS receiver itself (this is often a OEM module that has already been tested), but to verify that the rest of the system responds in the expected way to the information output from the GNSS module.
The traditional method of performing this testing is to have a fixed route to drive, walk or run when testing a system. Unfortunately, due to the weak nature of GNSS signals and the constantly moving satellite positions, this method of testing is far from ideal in terms of repeatability. The ability of the LabSat to replay the same scenario multiple times allows for a far greater level of repeatability in testing and so provides far greater confidence that the system is working as expected.
If a problem is found in the field, the highly portable nature of the LabSat 3 also allows for easy recording of the troublesome conditions or scenario. Not only does this allow for verification that the issue has truly been fixed rather than being masked due to different satellite positions, it also allows the problem to be re-produced on the bench; a major aid in debugging any problem.
When testing devices with antenna connectors, the LabSat has a proven track record of being an invaluable aid to product development and testing. Setup is often as simple as connecting the LabSat output to the antenna input port and pressing the play button.
Test process
Step 1)
Connect from the LabSat RF OUT port to the DUT antenna connector/RF IN. (If an attenuator is required place this inline between the LabSat and DUT).
Step 2)
Cold start your DUT.
Step 3)
Using the up and down arrows on the LabSat front panel, highlight the scenario desired for replay.
Step 4)
Press the ‘play’ button to start the scenario replay.
To verify your results, we recommend completing this process with a ‘known good’ receiver to act as the baseline for expected results.
Connection diagrams
LabSat 3
LabSat 3 Wideband
