And then, based on the positioning error model we analyze and simulate the positioning error which are caused by the error of the star tracking platform with the MATLAB software. Based on these we built the positioning error model of the celestial navigation. By building the mathematical model of the airborne celestial navigation system based on the inertial navigation system, using the method of linear coordinate transformation, we establish the error transfer equation for the positioning algorithm of airborne celestial system. Thus the navigation accuracy of airborne celestial navigation subsystem directly decides the accuracy of the integrated navigation system if it works for long time. Zheng, Xiaoqiang Deng, Xiaoguo Yang, Xiaoxu Dong, QiangĬelestial navigation subsystem of airborne celestial/inertial integrated navigation system periodically correct the positioning error and heading drift of the inertial navigation system, by which the inertial navigation system can greatly improve the accuracy of long-endurance navigation. Research on the error model of airborne celestial/inertial integrated navigation system
#Celestial air navigation software
HMNAO continues to combine the latest improvements and theories of astrometry with the creation of books and software that best meet the needs of celestial navigation users. The development of applications for mobile devices is also being considered. A new version of NavPac will be released in 2015 that will improve the user experience.
HMNAO also produces NavPac, a software package that assists the user in calculating their position as well as providing additional navigational and astronomical tools. The printed book, The Nautical Almanac, produced yearly and now available as an electronic publication, is continuously being improved, making use of the latest ideas and ephemerides to provide the user with their required data. HM Nautical Almanac Office (HMNAO) provides a number of these services. Along the way students see how science, mathematics, technology, and history are intertwined.Īlmanac services for celestial navigationĬelestial navigation remains a vitally important back up to Global Navigation Satellite Systems (GNSS) and relies on the use of almanac services. In the unit described in this article, students discover the main principles of navigation, build tools to observe celestial bodies, and apply their new skills to finding their position on Earth. It basically meets the requirements of the all-weather celestial navigation system, and it has the ability of stability, reliability, high accuracy and strong anti-interference.ĮRIC Educational Resources Information Center In perturbation environment, the position accuracy of the integrated navigation system can be increased 20% comparing with the traditional method. The experimental results show that the accuracy of the three axis attitude is better than 10″, and it can work all weather. Finally, an adaptive filtering algorithm based on P value is proposed, which can greatly improve the disturbance rejection capability of the system. The discrimination method of comentropy is studied to realize the independent switching of two celestial navigation modes, starlight and radio.
The research of celestial navigation system include discrimination method of comentropy and the adaptive navigation algorithm based on the P value. In order to realize autonomous navigation in the atmosphere, an all-weather celestial navigation system is designed. Sun, Hongchi Mu, Rongjun Du, Huajun Wu, Peng Design of all-weather celestial navigation system
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