The diversity of motor controllers in terms of drive methods, feedback acquisition, and control strategies leads engineers to waste a lot of time and effort in building the underlying interfaces and functional module interactions for mechatronic system design. The FPGA design of general control of the stepper motor based on the factory method pattern splits the general control functions into relatively independent sub-functions such as communication expansion, task scheduling, feedback acquisition, control expansion, on/off control, loop distribution, and drive binding. It maps functional requirements to each sub-factory class according to the design thinking of dependency inversion, realizing the decoupling of basic control attributes and complex control strategies. Therefore, it speeds up the software development and improves the portability of the program.
Due to LWIR FPAs is sensitive to ambient temperature, A new coarse and fine compound temperature measure and control method is presented for mK-level measure and control accuracy target of 12.5 um IR FPAs. Coarse measurement and control method is used in non-imaging period, and fine measurement and control method with low-drift precision temperature measurement circuit is used to achieve mK-level measure and control accuracy. Temperature drift model of precision temperature measurement circuit is established, and temperature drift contrast is done between traditional temperature measurement circuit and precision temperature measurement circuit. Experiment results show that the measurement precision of compound temperature measure and control method reaches 3mK and control precision reaches 8mK.
During the exposure time, the charge transfer speed in the push-broom direction and the line-by-lines canning speed of the sensor are required to match each other strictly for a space-borne TDICCD push-broom camera. However, as attitude disturbance of satellite and vibration of camera are inevitable, it is impossible to eliminate the speed mismatch, which will make the signal of different targets overlay each other and result in a decline of image resolution. The effects of velocity mismatch will be visually observed and analyzed by simulating the degradation of image quality caused by the vibration of the optical axis, and it is significant for the evaluation of image quality and design of the image restoration algorithm. How to give a model in time domain and space domain during the imaging time is the problem needed to be solved firstly. As vibration information for simulation is usually given by a continuous curve, the pixels of original image matrix and sensor matrix are discrete, as a result, they cannot always match each other well. The effect of simulation will also be influenced by the discrete sampling in integration time. In conclusion, it is quite significant for improving simulation accuracy and efficiency to give an appropriate discrete modeling and simulation method. The paper analyses discretization schemes in time domain and space domain and presents a method to simulate the quality of image of the optical system in the vibration of the line of sight, which is based on the principle of TDICCD sensor. The gray value of pixels in sensor matrix is obtained by a weighted arithmetic, which solves the problem of pixels dismatch. The result which compared with the experiment of hardware test indicate that this simulation system performances well in accuracy and reliability.
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