The Demonstration Study About The Structure Of The Strapdown Inertial Navigation System In Severe Mechanical Condition

Abstract: In our country, the accuracy level of the fiber-optics gyros (FOGs) is equal to the foreignproducts’ level due to the constant advancement of over20years. However, because of the limit of the internalprocessing and technology level, there are many disadvantages in the engineering application. And there are stillbig gap in the ability of the environmental adaptation, comparing with the international advanced level. Especially,when the strapdown inertial navigation system which composed of FOGs is working in the severe environmentalcondition, the accuracy might get dramatically worse, that can’t meet the demand of the military projectdevelopment. It is considered as the main factor restricting the engineering application of the domestic highaccuracy FOGs.Firstly, it is theoretically analyzed why the accuracy of theFOGs is lowered by the influence of thesevere mechanical condition in the beginning of this dissertation. Based on the current technology in ourcountry, the research and development demand of the military project can’t be satified only dependingon the FOG itself, according to not only the cost but also the R&D period. To fulfill the R&D task of themilitary project, the structural design of the strapdown inertial navigation system is optimized, thatsolves some problem in the isolation design. Consequently the goal that providing a much bettermechanical condition in which the FOGs can work efficiently is accomplished. And the applicationarea of the high accuracy FOGs is widely extended, this will improve the engineering application of thehomebred ones. Secondly, based on a special structural design case, the idea and design scheme forreducing the vibration-response level caused by the severe mechanical condition is presented. The keydesign parameters are computed out theoretically, furthermore many problems such as the processingand accuracy problems of the strapdown navigation system are resolved based on many-yearmechanical structural design experience. The simulation check computation on the vibration isolationdesign and structural stiffness etc is carried out by the use of some finite element analysis software,validating the idea and design scheme of the strapdown navigation system used the FOGs. Finally, somenotices about the dynamic experiments are presented, and the excellent performance of a typical productin several severe mechanical condition experiments are also described, it proves further that this sort ofstructural design technology is both available and correct.