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It is extremely challenging to apply an Inertial Navigation System (INS) to a gun-launched rolling projectile effectively. Overcoming the negative effects produced by high angular rolling and overloading requires innovative solutions. This paper introduces a unique inertial system that differs from a traditional gimballed INS and a strapdown INS. A Partial Strapdown Platform (PSP) was developed based on the principle of a pendulum to mitigate the adverse effects of projectile rolling motion. The anti-overloading performance of the PSP was improved by using a pair of specially designed alloy steel head-on hemispheres. Force condition analysis was conducted on the projectile and the PSP&#x2019;s inner cylinder to establish the mechanical dynamic model. Computer simulations and turntable experiments were performed to verify the stabilization function of the PSP. The pitch angle was determined to be associated with the stability of the PSP based on simulations and experiments. Gun firing tests were performed to verify the overload-burdening and stabilization functions of the PSP.

Stabilized Inertial Guidance Solution for Rolling Projectile Based on Partial Strapdown Platform