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Modern information warfare requires more and more high requirements for positioning and orientation system. Strapdown inertial navigation system is an indispensable positioning and orientation system for special vehicles. Based on this requirement, a signal processing platform of strapdown inertial navigation system with 100% localization rate is designed and developed. The platform is also adapted to RTLinux operating system, which can be applied to vehicle-mounted positioning and orientation system, airborne control system, avionics system, portable base station system, etc. Through design, development and experimental test, the function and performance of the strapdown INERTIAL navigation system signal processing platform meet the operational requirements, providing a solution for the autonomous and controllable localized strapdown inertial navigation system signal processing platform.