Study On Servo Control System Of Fast Positioning Of Photoelectric Equipment

With the development of photoelectric equipment, the ability to turn around quickly become an important indicator of photoelectric equipment, some of the traditional control algorithms can not meet the needs when fast positioning of the photoelectric equipment.Bang-Bang control in photoelectric equipment with large angle imbalance has been applied, its fast has been shown to is a good control algorithm, for the fast positioning capacity of photoelectric equipment, system for the switch into the small scope to stable capture and track the target, to ensure the accuracy of the laser ranging. Such the shortcomings of Bang-Bang control will be revealed, that is, after the Bang-Bang control into the small deviation, proved to be extremely unstable, and the convergence rate is relatively slow. A variable structure control method based on this paper is presented in this paper. The information system sent switch command to servo control system, servo judge switch angle, and switch according to the three-dimensional information of the variable structure control, namely the coarse tracking uses Bang-Bang control, when the extraction threshold of the image satisfied for the contrast of the target, it switches linear control into the small deviation range, and during the linear control, it puts forward the strategy of infrared an order capturing and infrared second-order tracking depending on the characteristics of different regulators. And gives the corresponding nonlinear and linear transformation conditions, the switching condition of position loop one order and two order regulator regulator. The core algorithm of 3D information based on variable structure control, this paper construct a servo with complete hardware and software control system.Firstly, this paper introduces the concept of photoelectric system, is extended from the the basic composition of the servo control system of the fast switch, and the photoelectric equipment servo control system main components selection and introduces the digital method of servo system in engineering.Secondly, access to more accurate mechanical time constant Tm. The traditional mechanical time constant Tm tend to ignore friction as a prerequisite, a photoelectric device as an optical precision machinery for Tm higher accuracy and reliability. In this paper step method to derive approximate e exponential function as a fitting formula Origin fitting software to obtain mechanical time constant Tm and magnification K with a high precision and reliability.Again, theoretically analyzed the deficiency of the single Bang-Bang control,three-dimensional information of variable structure control method is proposed, and demonstrated from theory and practice, while using PC104 servo module as the coreprocessor motherboard hardware design, implementation the speed and position of the double-loop stability control algorithm.Finally, this paper introduces the implement circuit design of servo control board and expansion of circuit and power driving. Through the main control computer guidance, the misalignment of target and double quick switch dynamic tracking test. Through the test, A typical 180 ° wide-angle fast positioning time is about 1.86 s, than the traditional method shortened by nearly 0.7s; typical 90 ° dual objective capacity of approximately 2.27 s, than the traditional method shortened by nearly 0.9s, rapidly improved significantly. With the laser rangefinder, taking messages, can be seen in four stable laser return value is stable after capture, to obtain an angle difference of 90 °. The three-dimensional information of double target is 0.44 Hz, stability meet the system requirements.