| With the rapid development of the infrared imaging technology, the infrared imaging system plays a more and more important role in the military and civilian areas. Based on the project of " Research on 128×128 InSb Cooled Infrared Imaging System ", aimed at the effectiveness of the detection and tracking of the aircraft, this paper designs and successfully develops a new infrared imaging system by utilizing the domestic cooled infrared focal plane array.This paper firstly describes the development and application of imaging technology at home and abroad, then analyzes the characteristics of infrared images and factors that affect the image quality on the basic structures of infrared imaging technology, and studies imaging processing algorithms such as the non-uniformity correction, blank pixels’replacement and image enhancement, which provides theoretical guide for image signal processing. we design the hardware of miniaturized imaging system based on FPGA, which mainly includes focal plane driver circuit, signal amplifying circuit, A/D data acquisition circuit, signal processing circuit, D/A video conversion circuit, storage circuit, temperature measurement circuit and power supply circuit. And the FPGA-based signal processing circuit not only completes the real-time implementation of image processing algorithm, but also bears the function of system clock management, temporal logic management, chip’ configuration, video coding and communication control.Based on the above ideas, this paper completes the hardware design and logical function design of the system by analyzing the performance requirements of miniaturization, low power consumption and real-time, and finally completes the debugging and testing of the cooled infrared imaging system. In the actual test, the output frame rate is 100Hz, the NETD is 25mK and the power consumption is about 3W. The results of the evaluations indicate that the infrared imaging system has reached the requirement of aircraft application. |
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