A Design Of Infrared Target System And Control Technology

Infrared thermography (IRT) is an efficient and precise imaging techniquebased on the infrared radiation of objects. With the features of strongenvironmental adaptation, long working distance, excellent antistealth capabili ty,light weight and small size, IRT has been widely used in the military fields oftarget identification and weapon guidance. In order to shorten the developmentcycle of infrared seeker, cut the costs of experiments, testing and maintenance,the infrared target system based on computer and automation technology hasbeen the key instrument for functional verification and parametric testing duringthe development process.At present, limited by the level of information technology and the capacityof systematic design, the domestically developed and equipped infrared targetsystems are difficult to meet the needs due to their poor accuracy of motioncontrol, low degree of automation and few types of functional testing.According to the analysis of technical characteristics and applicationrequirements, this paper designs and develops an infrared target system with highaccuracy of motion control and good operability. The system utilizes microcavity infrared blackbody and Cassegrain collimated optical path to build thesemi-physical infrared target. Combined with servos and aperture, the simulationtesting environment with different motion characteristics and physicaldimensions of infrared target can be made. The hardware circuit of the system isdesigned by applying the technical framework of DSP plus FPGA and PCIcontrol and communication board to realize the concurrency control andinformation collection of multiple functional modules. In addition, it simplifiesthe system integration and improves the interface compatibility. By employingthe Visual C++IDE and WinDriver driver development framework in the PCwith Windows operating system, the system provides user-oriented real-timecontrol and monitoring interfaces which enable to easily implement functionalconfiguration and parameter observation. On the basis of DSP processor platformin the PCI control and communication board, adaptive fuzzy PID controlalgorithm is applied to precisely control the motion of the infrared target and guarantees accuracy and robustness of controlling angular position and angularvelocity.The test results show that the infrared target system has achieved therequired simulation and testing functions and the parameter indicators havereached or exceeded the predetermined values. The system is capable of offeringdiverse and high-precision capabilities of infrared target simulation withexcellent operability and practicability. Currently, the system has been used inthe semi-physical simulation and testing process of several infrared seekers.