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Directly sensing stellar and horizon is simply and reliable based on the star sensor and earth sensor. The navigation precision is lower depended on earth sensor mainly. Indirect sensing horizon gets horizon information by observing atmosphere refraction stellar using star sensor. Because the number of refraction stellar and observing time are limited, the observed information is discontinuity. The paper presents a new information fusion method of autonomous navigation algorithm by importing earth's magnetic information. The integrated navigation method and algorithm are designed and simulating. The results of computer simulation show that the proposed system can improve the navigation precision and robustness. [ABSTRACT FROM AUTHOR]

Exothermic question of lithium/thionyl chloride battery will affect the efficiency of battery compartment of underwater vehicle, and may cause serious safety problems. Thus, the thermal process in battery compartment is analyzed by using CFD. Its mathematical and physical models are established by using coupled fluid-solid heat transfer method, and the temperature contours and temperature-time curves are simulated by adopting FLUENT 6.2 software. Also, they are tested experimentally. The test results indicate that the temperature contours and temperature-time curves inside the battery compartment are mainly relevant to the discharging current of ER48660 lithium/thionyl chloride battery and the heat conductivity of media. [ABSTRACT FROM AUTHOR]