Navigation is a key element influencing fluent, rapid, and safe transport of people and goods. During the last years, special attention was paid to satellite navigation, which is a part of radionavigation where positioning is done thanks to artificial satellites. Issues of application and development of satellite navigation systems in civil aviation are the subject of numerous research and scientific studies in the world. The quality of satellite signal determined by parameters such as accuracy, continuity, availability, and integrity determines possibility of its operational use. Particular attention of scientific research is therefore devoted to the requirements and limitations imposed on satellite systems prior to their implementation in aviation. This extremely important aspect justified undertaking of the aforementioned problem in this article. The paper attempts to answer the question on how to facilitate selection of navigation techniques for the aircraft operator, taking into account factors determining the accuracy, continuity, availability, and integrity of the satellite signal. As a result, the purpose of the work was defined as development of a method for forecasting the values of satellite navigation signal parameters used in air transport by artificial neural networks, taking into account selected atmospheric conditions. Results included in the work indicate further directions of satellite navigation system development. Due to authors’ opinion, the researches should focus especially on the analysis of real-time satellite signal parameter performance or creating applications for UAVs automatically deciding about used techniques of navigation.

The ITSs (Intelligent Transportation Systems) are part of the ICT infrastructure and are built taking into account numerous legal and organisational conditions and individual needs of the users. They are the answer for wide requirements due to implementation of innovations in road transport. The primary objective of using ITSs is to improve the efficiency of traffic and traffic safety. The aim of this paper is to present a technical approach aiming to model the impact of environmental conditions such as urban traffic, visibility, other weather conditions and road conditions on road traffic safety, using the fuzzy logic and trying to explain also the economic and legal determinants of road safety as "non technical" parts.

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A stable and predictable legal environment is one of the basic factors considered in the investment process. It is of particular importance in the energy sector with its characteristically long-term investments which require substantial financial outlays. It has to be underlined that the nature of energy industry is rapidly changing both from the overall shape of the investment and regulatory models. One can observe that the model of the energy market that used to be based on state monopoly evolved into private or half private structure. However, of the particular importance is the fact that together with liberalisation and privatisation of the market the state becomes an active regulator of the market. It is especially noticeable in renewable energy sector in which governments by anticipating and incentivizing are creating conditions for new investments. Simultaneously, one cannot ignore that the state active regulatory policy may also bring a risk that support for certain investments will last as long as it is necessary to achieve its goals such as environmental protection, the need to strengthen awareness or equalise support costs. Therefore, abrupt change in the legal framework may affect the previously accepted financial setup of the investment. In extreme cases, the change may make the investment unprofitable and thereby cause damage to the investor. This raises the question as to what legal remedies are available to foreign investors in the event of an unexpected and unjustified revision of the legal environment by the host state, provided that said revision causes damage to the investor. The authors assume the following thesis: the investor's interests are protected under the principle of reasonable and legitimate expectations established in the framework of international law. The practical aspect of the hypothesis is also related to the question of the legal force of the arguments contained in the cases that were analysed and given as an example in the paper. As the paper analyses the principle of reasonable and legitimate expectations in the framework of international law through the prism of the investments in the energy sector, it is reasonable to verify the hypothesis regarding the effectiveness of the said principle as a legal basis for bringing claims by the investor. By analysing the doctrine itself and the related legislation and judgements, the authors shall attempt to determine when, and under what conditions, it is possible to apply the principle of reasonable and legitimate expectations in order to minimise the regulatory risk of an investment.

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