## 4 Result  
It was found that the air surveillance systems did not have a backup radar system in the event of general failure, which directly affects the operation of air traffic. Therefore, the implementation of a transportable radar was necessary to minimize the operational impact  
Figure 3: Diagram for performance analysis (SASS-C). Figure 2: Transportable radar system. and ensure the highest performance, providing reliability and security, and requiring a short time to implement. Subsequently, we carried out an analysis of the benefits before, during and after the start-up of the MSSR-S transportable radar, following the methodology established in Table 1.  
During 2020, there was a worldwide event that affected the amount of opportunity traffic in the volume of radar coverage called the \"SARS-CoV-2 coronavirus pandemic\" which, due to the measures imposed by governments and the health agency (WHO-MINSA), decreased traffic. This was because of the measures proposed by governments, such as the beginning of confinement in different countries. This is illustrated in Figure 4.  
After the start-up of the transportable radar, a comparative analysis was carried out comparing the performance of the radar from Lima and the MSSR-S transportable radar prior to the modernization stage, which means that the Lima radar moves out of operation. The transportable radar complies with all the established standards and the performance, as demonstrated in the detectability performance, which is higher than 99% on average. See image of Figure 5.  
The evaluation of the false and multiple radar plots from Lima compared the MSSR-S transportable radar, prior to its commissioning as the main transportable radar, is presented as follows. As shown in Figure 6.  
An analysis of the systematic and random errors in the range and azimuth of the radar from Lima versus the transportable radar MSSR mode S, prior to its commissioning as the main transportable radar, is presented as follows. As shown in Figure 7.  
Figure 8 shows the loss area within the coverage of the transportable radar, both polar and vertical. Most of the Mode S losses are found in the northern areas of the radar, at 80 NM, due to the flight level of this aircraft and the presence of an obstacle in that area. Figure 4: Target report number from 17 March 2020 through 2022. Figure 5: Performance of the radar from Lima versus the MSSR mode S transportable radar, before the maintenance stage radar from Lima. Figure 6: False and multiple plots: radar from Lima versus transportable radar. Figure 2:0 Systematic error and random error: radar from Lima versus transportable radar. The results obtained through the continuous evaluation of performance are shown below, where the general state of the Peruvian air surveillance system is detailed for the period of modernization of the radar from Lima, with the transportable radar remaining operational and used as the main radar. The evaluation of the percentage of multiple targets that could be generated by different factors must be below 0.8% according to EuroControl. As shown in Figure 2:1  
An evaluation of the systematic error in distance and azimuth, without the radar from Lima, is presented below. The systematic error is shown in the Figure 2:2  
Figure 2:3 Detection probability of transportable radar Mode S, viewed in polar format. Figure 2:4 Percentage of multiple targets from CORPAC radars without the radar from Lima, including the transportable radar. An evaluation of the azimuth precision of the radars, without the radar from Lima, is presented below. In Figure 2:5  
An evaluation of the distance precision of the radars in the maintenance period of the Lima radar shows that they were within the limit established by EuroControl. Shown in Figure 2:6  
Figure 2:7 Systematic error in azimuth from the CORPAC radars without the radar from Lima, including the radar from Lima. Figure 2:8 Systematic error in distance from the CORPAC radars without the radar from Lima, including the transportable radar. Note.