When the position and attitude of the moving platform change, the Los stability control technology can isolate the vibration of the moving platform, compensate the attitude change of the moving platform, ensure the stability of the front LOS, and realize the stable pointing in a specific direction and the scanning of the stable area in a specific direction. In the conventional system, the inertial navigation feedback loop is used to realize the self closing loop to suppress the carrier disturbance, but its disadvantage is that the application scenario is limited. We introduce inertial navigation into the control system for feedforward use, which requires bandwidth matching in the control method and stable loop in the control strategy. Aiming at this technical difficulty, this paper studies the Los stability control technology under the moving platform. Firstly, the working principle of LOS stabilization system is analyzed, then the control algorithm is modeled, and the position loop, velocity loop and acceleration loop are designed respectively. Then the LOS stabilization coordinate conversion model is established, and the conversion relationship from spatial coordinate system to moving platform coordinate system is obtained. On the basis of moving platform stability correction, encoder and inertial navigation are used to form a double closed loop to improve the control effect of LOS stabilization and to achieve the purpose of suppressing visual
High-precision, stable tracking technology on a mobile platform is a key technology for realizing the integration of airborne search and tracking. In this study, coarse-fine compound technology based on gyrostabilization and miss tracking is applied. First, the working principle of the coarse and fine composite system is analyzed, and then the coarse and fine composite algorithm is modeled. Thereafter, the error of the coarse and fine composite axis is analyzed, and the precision tracking servo control algorithm is designed. Finally, using the model and algorithm designed to control the single reflector and galvanometer, the coarse tracking of the space target and the fine tracking of the source are completed under the condition that the equivalent sine amplitude is 5 deg and the frequency is 0.2 Hz. At the same time, a test system was built for performance verification. The algorithm achieved a coarse-tracking azimuth-axis tracking accuracy [root mean square (RMS)] of 26.3 μrad and a pitch-axis tracking accuracy (RMS) of 28.9 μrad. After composite tracking was switched on, precision tracking azimuth-axis tracking accuracy (RMS) improved to 7.9 μrad and pitch-axis tracking accuracy (RMS) improved to 6.3 μrad, both better than 10 μrad. This study provides new insights into the stability and precision tracking of single cameras on airborne platforms. At the end of this work, the outdoor experiment to verify the influence of random interference on the system performance under given conditions and the subsequent optimization direction of the system are given.
Stable gaze scanning control technology is the key to realize the integration of stable imaging, search, and tracking on airborne platforms. We investigate the control technology of stable gaze scanning on an airborne platform. The working principle of a stable staring scanning system is analyzed, and a servo system control algorithm is modeled. The position loop, velocity loop, and acceleration loop are designed. A stability model of the space with inclination angle is established. The coordinate transformation relationship between inertial coordinate system and airborne axis coordinate system is obtained. The designed control model and algorithm are used to control the single-lens reflex mirror mounted at an angle of 15 deg for spatial gaze pointing and step scanning. A test system is built for performance verification. Results show that the root-mean-square accuracy of the proposed algorithm is higher than 10 μrad in a dynamic staring step scan with ±30 deg and a step length of 2.16 deg. The single-step time is <52 ms, the stabilization time is >53 ms, and the servo system overshoot is small. The system step accuracy root mean square is better than 52 μrad. These findings confirm the effectiveness of the integrated search and follow technology under an airborne platform.
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