Speed Correction Technology of SSINS Based On Gravity Anomalies

Abstract

High-precision, high-reliability autonomous navigation of sea-based underwater carrier platform is the key technology to realize national marine strategy, with the continuous development and perfection of inertial elements and their inertial guidance technology, the way to describe the earth’s gravity field with a simple reference spheroid limits the performance of high-precision space-stabilized inertial navigation system(SSINS) to further improve, seriously restricts the launch accuracy of ship-based weapons, especially when the sea-based underwater carrier cruises, the vertical deviation of gravity may cause speed error in the horizontal loop of its inertial guidance system. This paper briefly describes the basic principles of high-precision spatially stable inertial navigation system, and discusses the relationship between its inertial guidance system, gravity data acquisition and gravity anomalies. It is analyzed that the level weight of accelerometer is disturbed by gravity error. On this basis, combined with the high-precision inertial navigation system, the gravity vector measurement scheme and the characteristics of the analytical measurement method are proposed, the influence relationship of gravity vector anomalies on the accuracy of space-stabilized inertial navigation system is deduled, the error analysis and simulation verification are carried out for the correction technology, and a reference is provided for the speed optimization design of the inertial/gravity combination system.