The conception of ultra-tight integrated GPS /INS navigation system is introduced.According to the variation of architectures and information processing methods,the ultra-tight GPS / INS integrated navigation system can be classified into three modes,which are INS aided ultra-tight integration,coherent deep integration and non-coherent deep integration.On the basis of providing architectures of different ultra-tight integration modes,their features are compared and analyzed respectively.The developments of GPS / INS ultra-tight integration at home and abroad are reviewed,and the key technologies and future directions of ultra-tight integration are pointed.

Survey of GPS/INS Ultra-Tight Integrated Navigation System

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