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 ...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.展开更多
the transmission error coed performance of square MQAM and starMQAM modulation schemes for the AGWN Rayleigh fading channel isanalyzed. The corresponding EBR formulas and computer aided numericresults are given. There...the transmission error coed performance of square MQAM and starMQAM modulation schemes for the AGWN Rayleigh fading channel isanalyzed. The corresponding EBR formulas and computer aided numericresults are given. Therefore it provides a Theoretical basis forchoosing MQAM modulation schemes in mobile communications.展开更多
基金Project(61503077)supported by the National Natural Science Foundation of ChinaProject(BK20130628)supported by the Jiangsu Natural Science Foundation,China
文摘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.
文摘the transmission error coed performance of square MQAM and starMQAM modulation schemes for the AGWN Rayleigh fading channel isanalyzed. The corresponding EBR formulas and computer aided numericresults are given. Therefore it provides a Theoretical basis forchoosing MQAM modulation schemes in mobile communications.
