论文部分内容阅读
针对捷联惯导系统水平回路的控制系统模型和误差特性,研究系统内水平阻尼网络的设计方法。通过建立单通道水平回路的控制系统模型,分析了系统的稳定性和频率特性。针对幅频特性曲线不同频段表征系统的不同性能,研究了一种基于对数幅频特性曲线的阻尼网络设计方法。通过将系统期望的调节时间、超调量等时域指标转化为频域参数,设计系统期望的开环幅频特性,从而确定捷联惯导系统水平阻尼网络参数。利用本文阻尼网络进行了捷联惯导系统数字仿真和海上试验。仿真条件下系统姿态误差的舒拉周期振荡成分经1～2个舒拉周期后衰减至零,系统位置误差由4 nmile/24 h提高至1.5 nmile/24 h.系统海上阻尼试验结果表明系统姿态精度提高1个数量级,位置精度提高1倍。与试探法设计的网络相比,本文网络具有一致的稳态性和更小的超调量和调节时间。
Aiming at the control system model and error characteristics of the strap-down system in horizontal loop, the design method of horizontal damping network in the system is studied. By establishing the control system model of single-channel horizontal loop, the stability and frequency characteristics of the system are analyzed. Aiming at the different performances of different frequency band characterization system of amplitude-frequency characteristic curve, a damping network design method based on log amplitude frequency characteristic curve is studied. The desired open-loop amplitude-frequency characteristic of the system is designed by transforming the time-domain index expected by the system into the frequency-domain parameter, so as to determine the horizontal damping network parameter of the SINS. Using the damping network in this paper, SINS digital simulation and offshore test were carried out. The Sulla periodic oscillation component of the system attitude error decays to zero after 1 ~ 2 Shura cycles under simulated conditions, and the system position error increases from 4 nmile / 24 h to 1.5 nmile / 24 h. The system sea damping test results show that the system attitude Accuracy increased by 1 order of magnitude, position accuracy increased by 1 times. Compared with the network designed by heuristic method, this paper has a consistent steady state and smaller overshoot and adjustment time.