In the distributed optoelectronic system, when the optoelectronic reconnaissance equipments cooperates to locate the target, it needs to use the azimuth and elevation information of the optoelectronic reconnaissance equipments, which usually has measurement errors. This paper proposes a distributed optoelectronic system collaborative positioning model with measurement errors, and analyzes the influence of the measurement errors of azimuth and elevation on the target positioning error, At the same time, the influence of the baseline between the optoelectronic reconnaissance equipment on the target positioning error is analyzed. the influence of the included angle between and the positioning lines on the target positioning error is analyzed. The modeling analysis shows that the smaller the measurement error of azimuth and elevation angle are, the smaller the target positioning error is; The longer the baseline is, the smaller the target positioning error is; The closer the included angle of the positioning line is to 4/π, the smaller the target positioning error is. It provides a basis for the selection of angle measuring sensors in the distributed optoelectronic system and the layout of optoelectronic reconnaissance equipment in the distributed optoelectronic system.
In the unmanned photoelectric reconnaissance vehicle network, each node cooperates to locate the target, which is beneficial to expand the reconnaissance range and obtain the target position information covertly. The unmanned photoelectric reconnaissance vehicle of each node can provide the angle information relative to the target when it reconnoitres the target. How to use the angle information of the target detected by each node to obtain the estimation of the target position information is worth studying. This paper studies the passive positioning technology in the unmanned photoelectric reconnaissance vehicle network, establishes the model of the unmanned photoelectric reconnaissance vehicle network for cooperative target positioning, and uses the least-squares method to design the target positioning algorithm. The error between the target position value and the true value is within 10m, which proves that the algorithm can effectively obtain the target position information, and provides an effective method for the hidden acquisition of target position information in the unmanned photoelectric reconnaissance vehicle network.
The PID controller is widely used in two-axis photoelectric platform velocity loop, however the control precision and the stability of controller are contradictory, especially when friction torque is added. In order to solve this problem, the characteristics of PID controller were analyzed detail in this paper, then a sliding mode controller was designed based on the approach law. First, the model of two-axis photoelectric platform velocity loop was established, then the friction model was linearized according to the interval analysis theory, after that the sliding mode function and the controller was designed, next the simulation model was build, finally, the performance of the velocity loop was compared between sliding mode controller and PID controller, the results showed the sliding mode controller has higher control precision and the stability.
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