Since China became a net oil importer in 1993, China¡¦s remarkable economic growth has fueled a demand for oil that has outstripped domestic sources of supply. China¡¦s reliance on oil imports to satisfy its oil requirements has become the potential threat to the national security. Therefore, The Chinese government advocated the ¡§Go Abroad¡¨ strategy and support overseas investment by the Chinese state-owned oil companies to diversify China¡¦s oil supply. This paper focuses on the development of Chinese oil companies¡¦ overseas investment based on the political-economic approaches to oil security. The research problem of this paper is: Why did the Chinese government decide to drive the state-owned companies¡¦ overseas investment? In what condition did the Chinese government interfere in overseas investment activities? What is Chinese oil companies obtained in their ¡§Go Abroad¡¨ activities? What Challenge will Chinese state-owned companies¡¦ investment in overseas oil fields face? The conclusion of this paper is that the incomplete business activities which the government¡¦s intervention in the overseas investment will lead to can¡¦t ensure oil security. It can be predicted that the Chinese state-owned oil companies¡¦ will have the economic nationalism guide the direction of their overseas investment development, but they will increasingly participate in the free trade mechanism in the international oil market.

This paper deals with the modeling of receiver properties for the transfer of command information for unmanned airplanes.

none

This diploma thesis deals with the simulation of the radio communication system for satellite control of unmanned aircraft, namely the command and control communication link – the forward link. The aim of the thesis is to create a simulator in the Matlab environment. The simulator includes a model of the transmitter, radio channel and receiver. Four-state CPM modulation with partial response and filtered symbol shape is used. The radio channel performs noise, frequency Doppler shift and time delay to the received signal. Subsequently, in the Acquisition Unit, the Doppler shift and time delay are detected and compensated. At the end of the thesis, the simulation results of the presented model are presented in the form of graphs đť¸s/đť‘0.