Three-dimensional Large Landing Angle Guidance Based on Two-dimensional Guidance Laws  

作　　者：DOU Lei DOU Jiao 

机构地区：[1]National Defence Key Laboratory of Ballistics Nanjing University of Science and Technology, Nanjing 210094, China [2]China Academy of Space Technology, Beijing 100094, China

出　　处：《Chinese Journal of Aeronautics》2011年第6期756-761,共6页中国航空学报（英文版）

基　　金：National Natural Science Foundation of China （60904085）; New Teachers’ Fund for Doctor Stations of Ministry of Education of China （200802881012）; Excellent Talent Project “Zijin Star” Foundation of Nanjing University of Science and Technology; Foundation of National Defence Key Laboratory of Ballistics

摘　　要：Both the design process and form of the three-dimensional （3D） suboptimal guidance law （3DSGL） are very complex. Therefore, we propose the use of two-dimensional （2D） guidance laws to meet the guidance requirements of 3D space. By analyzing the relationship between the flight-path angle and its projections on OXY and OXZ planes, we obtain the ideal design requirements of the guidance laws. Based on the requirements, we design a 2D suboptimal guidance law used in the horizontal plane; combining the 2D vertical suboptimal guidance law, we create a whole ballistic simulation of six degree-of-freedom. The results are compared with those using other three guidance modes in the case of large windage of the initial azimuth angle. When the proportional navigation guidance （PNG） law is used in the horizontal planes, the landing angle will obviously decrease. With the proposed guidance mode, the large landing angle can be realized and meet the guidance precision requirements. Moreover, the required overload can decrease to meet the control requirement. The effects of the proposed guidance mode are close to that of 3DSGL despite its very simple form.Both the design process and form of the three-dimensional （3D） suboptimal guidance law （3DSGL） are very complex. Therefore, we propose the use of two-dimensional （2D） guidance laws to meet the guidance requirements of 3D space. By analyzing the relationship between the flight-path angle and its projections on OXY and OXZ planes, we obtain the ideal design requirements of the guidance laws. Based on the requirements, we design a 2D suboptimal guidance law used in the horizontal plane; combining the 2D vertical suboptimal guidance law, we create a whole ballistic simulation of six degree-of-freedom. The results are compared with those using other three guidance modes in the case of large windage of the initial azimuth angle. When the proportional navigation guidance （PNG） law is used in the horizontal planes, the landing angle will obviously decrease. With the proposed guidance mode, the large landing angle can be realized and meet the guidance precision requirements. Moreover, the required overload can decrease to meet the control requirement. The effects of the proposed guidance mode are close to that of 3DSGL despite its very simple form.

关 键 词：optimal control guidance law THREE-DIMENSIONAL MULTI-CONSTRAINTS landing angle satellite-guided 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] D920.0[自动化与计算机技术—计算机科学与技术]