Global Navigation Satellite Systems (GNSSs) providing positioning, navigation and synchronization, has become an important element of modern systems and devices that have a crucial impact on many economy branches and the life of an common person. Literature analysis and reports from recent armed conflicts show that the use of techniques for jamming and spoofing GNSS signals is becoming increasingly. This reduces the level of safety in transport and increases the risk of improper operation of GNSS-based systems, like cellular telephony or bank sector. This paper focuses on the methodology for testing the GNSS receiver robustness for jamming. For this purpose, a broadband jamming device was developed.

The development of new telecommunication services requires the implementation of advanced technologies and the next generations of networks. Currently, the Long-Term Evolution (LTE) is a widely used standard. On the other hand, more and more mobile network operators (MNOs) are implementing the fifth-generation (5G) New Radio standard in their networks. It allows for increasing throughput, spectral, and energy efficiency and maximizing coverage, while reducing latency. The effectiveness of the introduced changes is measured by assessing the quality of service (QoS) in mobile networks. The paper presents the result evaluation of the QoS measurement campaign carried out using the drive test method in an urban area for four MNOs. We analyze the data transmission scenario, which is the basis of most modern telecommunications services. The result comparison provides an assessment of the 5G service implementation advancement by MNOs. In this analysis, we consider many QoS metrics (e.g., session time, throughput, and round-trip time) and parameters defining the radio signal quality (i.e., reference signal received power, signal-to-interference-plus-noise ratio). Our work also included searching for relationships between these parameters, using a correlation analysis. It allows for the selection of uncorrelated parameters to assess the quality of network, i.e., MNO evaluation, in terms of the provided QoS.

In this paper, we present a preliminary correlation analysis of quality of service (QoS) metrics for the upcoming fifth-generation (5G) network. This assessment was made based on drive-test measurements carried out in an urban environment for all four operators operating in Poland. The measurements were made by a professional company that assesses the quality and availability of mobile services. Our analysis is based on a Pearson correlation coefficient (PCC), which illustrates the similarities degree between two metrics. Typically, the PCC values for the two selected QoS parameters are small, i.e., the parameters are not linearly correlated. Therefore, in further analysis, we look at the distribution of parameters to indicate a non-linear relationship between them.

Objectives: The study examines intentional interference with GNSS signals, with emphasis on jamming, as an element of hostile activity in asymmetric and hybrid operations. It aims to characterise technical features and types of intentional GNSS interference, assess its effects on navigation and...