The Satellite Receiver Interference Suppression The Key Technology Research And Implementation

Serving as a supporting industry for our country's Wireless Communication project, Space Telecommunications have become an indispensably part of our modern society, within which satellite navigation system and satellite mobile communication system have become two hotspots of research works. Mordern satellite navigation system not only provides high precise time information and navigation service for military use, but also have a growing market for civil stuffs, such as ocean succor and car navigation. On the other hand, satellite mobile communication system acts as a supplement for Future Public Land Mobile Telecommunication System, and also an important part for realizing globalization, personalization and wideband communication systems.Although working for different purpose, all satellite systems face kinds of jammings. Jamming and interference may result in serious positioning error in satellite navigation system, and also increase outrage probability, deteriorate bit error rate performance in satellite mobile communication system. So it is important to study how to receive satellite signals under jamming environments.Although there are plenty of researches on anti jamming for GPS, Few are dealing with practical realization. In this paper, a number of anti-jamming technologies are studied for GPS navigation receivers. From a prototype designer's point of view, a system suitable for both broadband and narrowband interference suppression is proposed through systematic analysis, in which the FPGA design's results are given in detail.In LEO communication systems based on Orthogonal Frequency-Division Multiplexing (OFDM), when using the partial power training sequence to synchronize, the received data signals will be seriously interfered by the training sequence. This paper proposes an optimum method to suppress the interference from the training sequence to the data bearing OFDM symbols in frequency selective fading channels. A closed form formula for the optimized training sequence canceling factor is given by the theoretical analysis and its reasonability is verified by the simulation results.The research results of the satellite signal receiver's anti-jamming techniques in this paper can be applied in the signal processing techniques of the modern satellite navigation and communication systems, which are of great theoretical importance and economic value.