Analysis of structure and algorithm features of new type strapdown gravimetric navigation system

Abstract

The paper presents a structure and improved functional algorithms of a strap-down satellite inertial gravimetric navigation system of minimum hardware configuration. Various options of traditional loosely coupled and a new modification of closely coupled architectures were studied, which allowed for authors achieving sufficient precision of vector gravimetry and finding parameters of orientation and navigation. There were also studied potentials of increased accuracy and reliability of SGS as a component of functionally redundant cone-shaped accelerometer modules. The paper described the specifics of use of functional redundancy inertial measuring units. A specific version of a future modification of a closely related architecture is proposed, which opens up additional possibilities for evaluating and correcting errors of a satellite navigation system, which leads to an increase in the overall accuracy and reliability of determining orientation, navigation, and gravimetric parameters. The advantages of use of streamlined redundant raw data sensors were estimated qualitatively and quantitatively.

Keywords

• functional algorithm
• vector gravimetry
• inertial measuring unit
• optimal estimation
• error correction