Play a GNSS Signal with Multi-tone Interference Signals

This procedure guides you through the settings to play a real-time GNSS signal using the GNSS Settings on the software's user interface (UI).

To learn more about individual cell settings, refer to the UI descriptions.

While the scenario is playing, the GNSS node Constellation Control properties, and the properties under the Satellite Settings node are still active. These properties can be modified while the scenario is playing and affects the scenario in real-time. The GNSS Scenario Start Time Offset property is also still active, but will not affect the scenario unless it is paused and the Restart button is clicked.

To learn how to generate a real-time GNSS Signal, refer to Generating a Real-Time GNSS Signal.

  1. In the tree, click GNSS to see the GNSS settings.

  2. View the Capability cell and ensure that Advanced Real-time Signal Generation is the current selection. If not, click the Capability cell, and use the drop-down arrow to display a menu from which you can select Advanced Real-time Signal Generation.

  3. View the Simulation Mode cell and ensure that Navigation is the current selection. If not, click the Simulation Mode cell, and use the drop-down arrow to display a menu from which you can select Navigation.

  4. Click the Scenario Source cell and ensure that User Scenario File is the current selection. If not, use the drop-down arrow menu to select User Scenario File.

  5. Click the Scenario File cell and use the dialog box launch icon to launch the Open dialog box to navigate to and select a scenario file.

  6. Enter a power reference value in Satellite Power Referencecell. In this example, enter -60 dBm.

  7. In Constellation and Muti-tone Interference table pane, click the ClosedMulti-tone Interference tab, and specify the following parameters:

    1. Enable Tone #1, Tone #2 and Tone #4.

    2. Specify the Frequency Band where the interference tone is located. Specify GPS L1 for Tone #1, GLONASS L1 for Tone #2 and Beidou B1 for Tone #4.

    3. Enter the Frequency Offset of the interference tone, relative to the center of the frequency band - GPS L1 at 1.57542GHz, GLONASS L1 at 1.602GHz and Beidou B1 at 1.561098GHz. Specify 1 mHz for Tone #1, 500kHz for Tone #2 and 1MHz for Tone #4.

    4. Enter the Absolute Power level of the interference tone in dBm. The power level should be within [-60dB - 0dB] range of Satellite Power Reference.Specify -60 dBm for Tone #1.

  8. Click State On to start the playback from the beginning of the scenario or from the Scenario Start Time Offset, if one is entered.

  9. After the scenario is running on the signal generator,click the Satellite Settings node to set various satellite parameters such as turning individual channels off or on in real-time while the signal is playing. To change a channel’s status, click on the Enabled cell . Another setting to change in real-time is the relative power level for each satellite channel.

    All of the Satellite Settings can be set either before or after starting the scenario playback.