## 6 Test Results
### Professional Grade Receiver  
Similar to the MM receiver, the consequences of the interference presence on the PRO grade RUT are degradation in the signal quality and hence the position accuracy, which worsen as the interference level increases, until the RUT loses its position fix. An example of such interference impact on the PRO grade RUT is given in Figures 6 and 7, which show the average C/N\({}_{0}\) of tracked satellites and the East-North-Up deviations of the position solution for the test case PRO02-STATIC-SENSITIVITY (threat signature 02: multiple narrowband interfering signals), respectively. Figure 4: Average C/N\({}_{0}\) of tracked satellites for MM RUT in the presence of threat signature 02. Figure 5: East-North-Up deviations for MM RUT in the presence of threat signature 02. Additionally, in this case, due to the cold start and the resulting unavailability of ionospheric parameters and to the convergence of the navigation filter, the professional grade RUT offers an inaccurate position solution in the beginning, especially in the vertical component. Table 5 summarizes the results for the PRO grade RUT. It can be seen that both J/S\({}_{\text{PVT\_{\_}}\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{ \text{\_}{\text{\_}{\text{\_}{\text{\text{\_}}{\text{\text{\tiny I}}}}}}}}}}}}}\) and J/S\({}_{\text{PVT\_}\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{\text{\_}{ \text{\text{\_}{\text{\text{\}}{\text{\text{\tiny I}}}}}}}}}}}}}}\) are in the range 40-55 dB and 35-45 dB, respectively. Consequently, the position fix availability for the professional grade RUT in the presence of the five interference threats is between ~61% and ~66%. The TTRP tests showed that the professional grade RUT takes from 6 to 10 s to recover from a strong interference event. Figure 6: Average C/N\({}_{0}\) of tracked satellites for PRO RUT in the presence of threat signature 02. Figure 7: East-North-Up deviations for PRO RUT in the presence of threat signature 02. Comparison Between Mass Market and Professional Grade RUT with Default C/N\({}_{0}\) Masking Settings  
From the comparison between Tables 4 and 5, it can be observed that the availability of the position fix during the interference interval does not differ much between mass market and professional grade receivers. This is partly due to the fact that the C/N\({}_{0}\) mask was set to 25 dB-Hz for both the receivers' PVT computation. In order to properly compare the behavior of the two categories of RUT, additional tests with default C/N\({}_{0}\) mask settings were carried out. In particular, sensitivity tests were performed for the mass market and the professional receiver in the presence of the threat signature 03, triangular chirp swept frequency interference signal (MM03 and PRO03). Figure 8 shows the ENU (East-North-Up) deviations of the position solution for the MM and the PRO receivers. As it can be seen from the figure, the behaviour of the two receiver categories differs significantly when default settings of C/N\({}_{0}\) are used. In particular, the MM RUT prioritizes the availability of the position solution over its accuracy. During the interference interval, there are only a few epochs at which the receiver does not yield a position solution, but this high yield comes with degraded positioning accuracy. On the other hand, the PRO RUT prioritizes the accuracy over the availability. It does not offer the position solution as often during the interference interval, but when it does the position errors are small. The difference between the mass market and the professional grade receivers' behavior is also visible in Figure 9, which shows the drop in the average C/N\({}_{0}\) of the satellites used in position fix with respect to the baseline for the entire duration of the test. While the MM RUT continues to use very low quality signals in order to provide a position solution, even if inaccurate, for as long as possible, the PRO RUT stops computing the solution when the signal quality decreases by about 20 dB.