## 4 Conclusions  
The main aim of this paper was to verify the influence of varying weather conditions on the accuracy of positional determination during navigation. As shown in the literature review, the issue of objects positioning accuracy (especially in transport applications) is extremely important, so solutions that increase the accuracy of position determination should be implemented. Both hardware and software solutions are used in this area. Moreover, the need to analyze this issue arises from the growing application of autonomous devices in everyday life. If they operate and move independently, precision of their navigation must be high, with centimeter-level accuracy, especially since they cannot use senses (to correct the position) in the same way as people. To achieve the paper's goal set, a short introduction of satellite systems and errors in position determination was presented. Then, satellite signal measurement in various weather conditions were conducted and discussion was attached. As a result of the carried-out research, it can be concluded that it is possible to achieved the expected accuracy. A large part of the position determination, based on conducted measurements, is satisfactory. Unfortunately, due to various types of errors, this does not apply to all of the measurements. The reason for this is, certainly, the constantly changing weather conditions, which affect the operation of satellite systems-receiver pair, as well as the reliability/visibility of satellite systems. Furthermore, to a large extent, the use of the absolute method of satellite signal measurements also contributed to the positioning errors. In the future, to increase the accuracy of position determination by GNSS systems, it is proposed to use a dual-frequency receiver that eliminates ionospheric refractions and an additional reference station with fixed geographic coordinates that would communicate with the receiver/autonomous machine. Such a solution would further increase accuracy and minimize the impact of errors generated by the environment. Development of telecommunication networks may positively influence navigation as well. It must be also taken into account that the study was conducted for a fixed latitude. The effect of the ionosphere is critical in high-accuracy GNSS applications and it is highly dependent on the latitude. The effects are most intense in the equatorial region, moderate at high latitudes, and minimum at middle latitudes. To draw more reliable conclusions regarding the influence of space weather, measurements at different latitudes and during the entire solar cycle should be conducted, which is a field for future research. The research carried out may be summed up in this way: environmental conditions, without doubt, affect the accuracy of position determination. The variability of environmental conditions is of great importance here and it is necessary to aim at solutions that reduce their impact on the accuracy of location. The ultimate (however, unwanted) solution is to rely on weather forecasts to capture extreme phenomenon. In case of solar activity influence, for example, forecasts can be useful to such an extent that on days with unfavorable weather conditions (solar flares of high classes), the autonomous machines can postpone their outdoor tasks in order to not be damaged due to positional inaccuracy. Conceptualization, M.N. and E.D. ; methodology, M.N. and E.D. ; validation, M.N., E.D. and A.R. ; formal analysis, M.N. and E.D. ; investigation, M.N. and E.D. ; resources, M.N. and E.D. ; data curation, M.N. and E.D. ; writing--original draft preparation, M.N., E.D. and A.R. ; writing--review and editing, E.D. and A.R. ; visualization, M.N. and E.D. ; supervision, E.D. and A.R. ; project administration, E.D. ; funding acquisition, E.D. All authors have read and agreed to the published version of the manuscript.