Key Technology Analysis And Design Of Dual-Mode Simulation

IR/MMW dual-mode compound guidance technology is considered the most promising guidance technology. It combines the IR and MMW guidance system in a complementary way, which overcomes each weakness and combines advantages of both. The advance of IR/MMW dual-mode compound guidance technology, particularly, the advance of IR/MMW dual-mode common-aperture seeker had led to a requirement to develop the simulation tools. The most important techniques for supporting systems development is the hardware-in-the-loop simulation. Compared to single-mode simulation facilities, dual-mode simulation facilities must be able to present simultaneous MMW and IR scene. So it is considered to be the most challenging. Currently, dual-mode simulation technology has being researched and developed in The USA and Europe, and a great progress has been made. Research on the dual-mode simulation technology in China is in the initial stage, and some key technologies still need to be broke through.Based on the requirement of dual-mode simulation, two key technologies of dual-mode simulation including dichroic beam combiner and IR scene projection system were analyzed and designed.The overall system configuration was analyzed for dual-mode simulation requirement. Two key subsystems were emphasized. For beam combiner, the structural styles of beam combiner were analyzed and the rational one was determined. Operation principle was overviewed and main technical requirements were presented. For IR scene projection system, main technical requirements of IR scene projector based on resistor array were analyzed. And a special requirement on collimating optics was discussed. Finally a design specification for collimating optics was presented.The impact on the MMW signal by beam combiner should be considered at first in the dual-mode simulation. This paper analyzed theoretically the distortion effect on the MMW signal and presented the method. Substrate material selecting include several factors, such MMW transmission, insertion phase delay, size of substrate material, and coating, all of them were studied. The substrate material was determined, and the thickness of the substrate material was optimized.Based on the given design specifications, the difficulty of designing was discussed. The designing styles were analyzed and the rational one was determined. Optical materials were properly selected. A reasonable optical system was designed and its image quality was evaluated. Finally, the tolerance of the collimating optics was analyzed.