In the field of autonomous navigation, the accuracy of the inertial navigation system (INS) heavily relies on the initial position information. Typically, this information is obtained from the global navigation satellite system(GNSS) or celestial navigation system (CNS). In this study, we present a novel approach for acquiring precise initial position information using the INS/CNS integration system. This method enables the independent determination of the carrier’s high-precision initial position in a static state. The experiment results show that the latitude error is 48.35m and the longitude error is -55.80m of this approach, which provide compelling evidence for the effectiveness of the proposed celestial positioning method.
For the marine integrated navigation system composed of strapdown inertial navigation system (SINS) and Doppler velocity log (DVL), when the range of DVL is insufficient, it can only output the velocity of carrier relative to ocean current. If the algorithm is not improved, it will cause great navigation and positioning error. In this paper, the Kalman filtering equation is derived by analyzing the error equation of integrated navigation system, and a SINS/DVL integrated navigation algorithm considering ocean current velocity is proposed, and the feasibility of the algorithm is verified by simulation experiments. The simulation results show that the SINS/DVL integrated navigation algorithm considering ocean current information can effectively improve the positioning accuracy when DVL works in water tracking mode.
A visual localization method based on roadside landmarks is proposed in this paper. This method uses a single image obtained by a high-speed camera fixed on the top of the vehicle to accomplish real-time positioning. The information and characteristics of roadside landmarks is extracted and recognized from the image obtained. The distance between landmark and camera optical center is calculated according to the shape of the landmark. Finally, the vehicle position is calculated with the distance and the landmark database, which contains the characteristics and position of the landmark. Static and dynamic experiments are carried out and the results demonstrate that the proposed method can achieve vehicle positioning. Under the condition of an actual distance is below 40 m, the average positioning error is below 1m.
The “Unity of Knowing and Doing” (UKD) theory is proposed by an ancient Chinese philosopher, Wang Shouren, in 1508, which explains how to unify knowledge and practice. Different from the Chinese traditional UKD theory, the international higher education usually treats knowledge and practice as independent, and puts more emphasis on knowledge. Oriented from the UKD theory, the College of Opto-electric Science and Engineering (COESE) at National University of Defense Technology (NUDT) explores a novel training model in cultivating opto-electric professionals from the aspects of classroom teaching, practice experiment, system experiment, design experiment, research experiment and innovation experiment (CPSDRI). This model aims at promoting the unity of knowledge and practice, takes how to improve the students’ capability as the main concern and tries to enhance the progress from cognition to professional action competence. It contains two hierarchies: cognition (CPS) and action competence (DRI). In the cognition hierarchy, students will focus on learning and mastering the professional knowledge of optics, opto-electric technology, laser, computer, electronics and machine through classroom teaching, practice experiment and system experiment (CPS). Great attention will be paid to case teaching, which links knowledge with practice. In the action competence hierarchy, emphasis will be placed on promoting students’ capability of using knowledge to solve practical problems through design experiment, research experiment and innovation experiment (DRI). In this model, knowledge is divided into different modules and capability is cultivated on different levels. It combines classroom teaching and experimental teaching in a synergetic way and unifies cognition and practice, which is a valuable reference to the opto-electric undergraduate professionals’ cultivation.
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