Time filter

Source Type

Li C.,Beijing Institute of Space Machine and Electricity | Teng H.-S.,Beijing Institute of Space Machine and Electricity | Zhu Y.-H.,Nanjing Southeast University | Jiang W.-S.,Beijing Institute of Space Machine and Electricity | And 4 more authors.
Journal of Central South University | Year: 2016

Traditional parafoil homing usually uses a point as object. As the mobility of parafoil is limited by its glide ratio and wind, in some cases when the parafoil scatter area is large, or the glide ratio of parafoil is small, the deviation of its landing point to object point will be arduous to control. Accordingly, during these situations, when parafoil is used in recovery of spacecraft or satellite, the landing area of parafoil can be set as a rectangle, and the object of parafoil can be set as a line segment. The thesis of this work is designing an algorithm for parafoil homing using line segment as object. The algorithm of wind velocity and direction calculation in different flying segments was also investigated. The algorithm designed navigates the parafoil to land into the predestined area and largely reduce the probability of recovery loads falling to unwanted area to damage houses and people. © 2016, Central South University Press and Springer-Verlag Berlin Heidelberg.


Zhu Y.-H.,Nanjing Southeast University | Cai T.-J.,Nanjing Southeast University | Li C.,Beijing Institute of Space Machine and Electricity | Xu Z.-Y.,Nanjing Southeast University
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2012

In view of the limitations of conventional INS/GNSS integrated navigation method, an orienting technique based on polarized light was studied. First, the atmospheric polarization mode in clear sky was explored, and the ideal atmospheric polarization characteristic was revealed. Second, the principle of polarization navigation sensor was analyzed. In order to change the orientation value measured by polarization sensor to the heading, the calculation equations to determine solar position was derived. At last, the structure of SINS/GPS/Polarized-Light integrated navigation system was designed, and the dynamic simulation was carried out. The simulation results indicate that the system's heading error can be corrected by information from polarization sensor effectively, and the heading accuracy is equivalent to that of polarization sensor. The independent orienting technique based on polarized light can enhance the system's navigation performance and has wide application prospect.


Li C.,Beijing Institute of Space Machine and Electricity | Lu Z.-H.,Beijing Institute of Space Machine and Electricity | Huang W.,Beijing Institute of Space Machine and Electricity | Shen C.,Beijing Institute of Space Machine and Electricity
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Using embedded navigation & control device, double-antenna GPS device, unwire data transporter and big moment direct current electromotor, navigation control software, landing point pre-setting software, remote control & communication software, GPS data converse software was designed independently. Precision fix-point homing parafoil control system which has two working modes of automatic homing and manual remote control was developed. In the automatic homing mode, system controls parafoil approaching the pre-setted target point. And in the manual remote control mode, ground operating person sends remote control instructions to operate parafoil returning using ground control computer. And the control system was validated by association test and load test, respectively. The result indicates that the control system our research provided fulfilled the demand of controllable parafoil fix-point homing.

Loading Beijing Institute of Space Machine and Electricity collaborators
Loading Beijing Institute of Space Machine and Electricity collaborators