Aerocapture is one of the key technologies for low-cost transportation,with high demands of autonomy,accuracy,and robustness of guidance and control,due to its high reliability requirements for only one chance of tryi...Aerocapture is one of the key technologies for low-cost transportation,with high demands of autonomy,accuracy,and robustness of guidance and control,due to its high reliability requirements for only one chance of trying.A unified numerical predictor-corrector guidance method based on characteristic models for aerocapture is proposed.The numerical predictor-corrector guidance method is used to achieve autonomy and high accuracy,and the characteristic model control method is introduced to achieve robustness.At the same time,by transforming path constraints,characteristic model equations including apogee deviation and altitude differentiation are established.Based on the characteristic model equations,a unified guidance law which can satisfy path constraints and guidance objectives simultaneously is designed.In guidance problems,guidance deviation is not directly obtained from the output of the dynamics at present,but is calculated through integral and algebraic equations.Therefore,the method of directly discretizing differential equations cannot be used to establish characteristic models,which brings great difficulty to characteristic modeling.A method for characteristic modeling of guidance problems is proposed,and convergence analysis of the proposed guidance law is also provided.Finally,a joint numerical simulation of guidance and control considering navigation deviation and various uncertainties is conducted to verify the effectiveness of the proposed method.The proposed unified method can be extended to general aerodynamic entry guidance designs,providing theoretical and methodological support for them.展开更多
为了解决激光驾束制导中发动机烟雾对制导激光场信号的衰减问题,采用van de Hulst近似计算方法,模拟研究了烟雾对1.06μm,1.55μm,10.6μm波长的激光在不同复折射率参量下的吸收、散射、衰减效应。结果表明,复折射率不变时,烟雾对长波...为了解决激光驾束制导中发动机烟雾对制导激光场信号的衰减问题,采用van de Hulst近似计算方法,模拟研究了烟雾对1.06μm,1.55μm,10.6μm波长的激光在不同复折射率参量下的吸收、散射、衰减效应。结果表明,复折射率不变时,烟雾对长波长激光的吸收衰减较小;烟雾对激光的衰减峰值随着折射率虚部的增大而变小;峰值的位置随着激光波长的增加向粒子半径增大的方向移动。该研究结果对激光驾束制导武器的研制具有较大的参考价值。展开更多
基金The National Key R&D Program of China(2018YFA0703800)。
文摘Aerocapture is one of the key technologies for low-cost transportation,with high demands of autonomy,accuracy,and robustness of guidance and control,due to its high reliability requirements for only one chance of trying.A unified numerical predictor-corrector guidance method based on characteristic models for aerocapture is proposed.The numerical predictor-corrector guidance method is used to achieve autonomy and high accuracy,and the characteristic model control method is introduced to achieve robustness.At the same time,by transforming path constraints,characteristic model equations including apogee deviation and altitude differentiation are established.Based on the characteristic model equations,a unified guidance law which can satisfy path constraints and guidance objectives simultaneously is designed.In guidance problems,guidance deviation is not directly obtained from the output of the dynamics at present,but is calculated through integral and algebraic equations.Therefore,the method of directly discretizing differential equations cannot be used to establish characteristic models,which brings great difficulty to characteristic modeling.A method for characteristic modeling of guidance problems is proposed,and convergence analysis of the proposed guidance law is also provided.Finally,a joint numerical simulation of guidance and control considering navigation deviation and various uncertainties is conducted to verify the effectiveness of the proposed method.The proposed unified method can be extended to general aerodynamic entry guidance designs,providing theoretical and methodological support for them.
文摘为了解决激光驾束制导中发动机烟雾对制导激光场信号的衰减问题,采用van de Hulst近似计算方法,模拟研究了烟雾对1.06μm,1.55μm,10.6μm波长的激光在不同复折射率参量下的吸收、散射、衰减效应。结果表明,复折射率不变时,烟雾对长波长激光的吸收衰减较小;烟雾对激光的衰减峰值随着折射率虚部的增大而变小;峰值的位置随着激光波长的增加向粒子半径增大的方向移动。该研究结果对激光驾束制导武器的研制具有较大的参考价值。
