摘要
星载自跟踪系统由于其特殊的工作环境,易产生和差信号的校相残差,从而影响系统跟踪性能,严重时甚至会导致跟踪无法收敛,因此,研究其对自跟踪系统的影响规律,具有实际工程指导意义。由于实际系统具有惯性延时、非线性等特点,无法使用纯数学方法分析和差信号校相残差对自跟踪的影响。本文采用了数学分析结合仿真分析的方法,首先使用数学方法分析了校相残差对无惯性延时理想系统的影响,得到了校相残差对跟踪轨迹、收敛速度的影响规律。然后,结合星载自跟踪系统负载跟踪速度较低的特点,建立并简化了自跟踪系统仿真模型。仿真结果显示,实际系统相对于无惯性延时的理想系统,校相残差的影响更显著,但跟踪轨迹、变化规律相同;同时也验证了理论分析的正确性。结论表明,随着校相残差从零逐渐变大,跟踪轨迹由直线收敛、螺旋收敛、圆形环绕变为螺旋发散直至直线发散;校相残差对自跟踪系统的影响大小主要由控制系统惯性延时和开环增益决定,惯性延时、开环增益越大收敛速度越慢直至发散。
Due to its special working environment,spaceborne self-tracking system is prone to phase calibration Residuals,which will affect the tracking performance of the system,and even lead to diverge in serious cases.Therefore,it is of practical engineering significance to study its influence on the self-tracking system.Because actual system has the characteristics of inertia delay and non-linearity,it is impossible to analyze the effect of phase calibration residuals on self-tracking using pure mathematical method.This paper uses the method of combining mathematical analysis with simulation analysis.Firstly,the mathematical analysis method is used to analyze the effect of phase calibration residuals on ideal system without inertia delay.The effects of phase Calibration Residuals on tracking trajectory and convergence speed are obtained.Then considering the low speed of spaceborne self-tracking system,the simulation model of the self-tracking system is established and simplified.The simulation results show that compared with the ideal system without inertia delay,the effect of phase calibration residuals is more significant,but the tracking trajectory and variation law are the same.At the same time,the correctness of theoretical analysis is verified.The conclusion shows that the tracking trajectory changes from linear convergence,spiral convergence,circular encirclement,spiral divergence to linear divergence as the calibration residuals increases gradually from zero to linear divergence.The influence of calibration residuals on self-tracking system is main determined by the inertia delay and open-loop gain of the control system.The greater the inertial delay and open-loop gain,the slower the convergence rate until divergence.
作者
孙正海
李华春
余晓川
SUN Zhenghai;LI Huachun;YU Xiaochuan(China Academy of Space Technology(Xi'an),Xi'an 710000,China)
出处
《空间电子技术》
2019年第5期50-56,共7页
Space Electronic Technology
关键词
校相残差
自跟踪系统
惯性延时
开环增益
跟踪轨迹
Phase calibration residuals
Self-tracking system
Inertial delay
Open-loop gain
Tracking trajectory
