半捷联导引头光轴稳定性

为研究半捷联导引头光轴稳定性，对影响半捷联导引头光轴稳定的因素进行了分析。通过对半捷联稳定原理和传统速率陀螺稳定原理的分析和比较，揭示了半捷联稳定的实质。根据半捷联稳定方式下平台框架的惯性空间角速度表达式，分析了影响半捷联稳定的主要因素。针对影响半捷联稳定的弹体扰动和扰动力矩，采用了匹配滤波和扰动观测器的方法提高系统稳定精度。数值仿真结果表明，匹配滤波的方法有效地减小了弹体扰动对系统稳定的影响，平台对弹体扰动的解耦精度在1 Hz时提高了38 dB；扰动观测器有效抑制了扰动力矩对系统稳定的影响；采用高精度、低噪声的传感器是减小测速噪声对系统稳定影响的关键。综合仿真结果显示，在对3个主要因素补偿后，系统的稳定误差减小了近94%。

Optical axis stabilization of semi-strapdown seeker

In order to investigate the stabilization of optical axis of semi-strapdown seeker, the factors that influence the stabilization were analyzed. The essence of semi-strapdown stabilization was proposed by comparing with the traditional gyro stabilization method. The expression of the inertia-space velocity of optical axis was showed, and the main factors that influence the semi-strapdown stabilization were analyzed. The matched filter and disturbance obverse were used to improve the precision of semi-strapdown stabilization against missile disturbance and disturbance torque. The numerical simulation result shows that the matched filter rises 38 dB of the coupling precision at 1 Hz; the influence to stabilization caused by disturbance torque is greatly reduced by disturbance observer; and the stabilization error caused by velocity measurement is improved by using high precision and low noise sensor. The integrated simulation result shows that the stabilization error is declined nearly 94 percent after compensating for the three main factors.