On this tab, you can configure the connection to the receiver UBLOX to get current coordinates, accuracy, time and information about the satellites being observed

Once the current time is determined, you can download the Ephemeris and Almanac files.

• USRP name - the name of your USPR board, what you already setted in NI-USRP Configuration Utility
• IQ Rate - IQ sample rate. The minimal value is 1.5 MHz. The maximal value is 5 MHz. The higher the value you put, the more CPU of your computer will be loaded.
• 10 MHz Ref - The source of 10 MHz reference frequency: External or GPSDO. In case you work with antenna, GPSDO on your USRP board will be spoofed, so you need to use external high quality reference source.
• Spoofing mode - Asynchronous, Synchronous. Read our article about different types of spoofing.
• Start delay, s - Generation start offset for synchronous mode. Can be used to study the required accuracy of signal synchronization.
• Conducted connection flag - set it in case you use cable connection to the DUT. In case you work on antenna unset it.
• Opened flag - in case of successful USRP initialization.
• GPS locked flag - in case of successful USRP GPSDO 3D-fix. Synchronous generation available only if this flag is setted.
• Cable Length, m - The total length of all applied cables. It is used for Total Path Gain calculation.
• USRP Cal Factor, dB - USRP calibration value. Calibration procedure described there - USRP Calibration Procedure
• Amplifier Gain, dB - set the gain of the external RF power amplifier in case radiated test.
• Attenuator, dB - total path attenuation in cables and\or attenuators
• Antenna Gain, dB - set the antenna gain in case radiated test.
• Sidelobe, dB - Sidelobe of the receiving antenna of the DUT, taking into account the angle of arrival of the signal. Used to calculate the signal power of the simulator in the phase center of the DUT antenna.
• Max Generator EIRP, dBm - Maximum available Effective Isotropic Radiated Power of the generator with particular amplifier, antenna and cables.
• Total Path Gain, dB - calculated taking into account the antenna gain, power amplifier, attenuation in cables and sidelobe of the receiver antenna
• Max distance to target - Maximum available distance to the DUT.

Here you can set the distance and direction to the sample in case of field testing:
The user can determine the distance to the sample using two methods:

• The distance to the DUT on the ground and the height of the DUT
• The distance to get on the ground and in line of sight.

In this tab, the user can start the generation and also distort the signal.

Here you can shift the 1PPS or timestamp of the DUT in different ways.

• Current 1PPS offset, s - Adds an offset to the generated sequence in such a way as to shift the 1PPS signal of the DUT.
• Current GPS Time of week offset, s - Dramatically changes the ToW in HOW in all subframes. The position of all satellites is recalculated based on the new time. Thus, the receiver is temporarily lost tracking the satellites. Make sure that the power level of the generated signal is sufficient to block the real signals.
• Sats clock corr offset, s - Sinhronius simulates clock drift on all satellites. Leads to a smooth drift of 1PPS impulse of the DUT

Here you can move the coordinates of the DUT for a certain number of meters for a certain time

This is the experimental tab. Where can you add an fixed offset and noise to the coordinates of the DUT and the noise to Doppler offset. You can set the mean value and the standard deviation of the noise.

On this tab you can set the relative power, pseudorange offset and Doppler offset for each satellite.

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