The Strapdown Inertial Navigation Algorithm Testing Platform Based On Virtual Instrument

A number of advantages of Strapdown Inertial Navigation System (SINS) have made it be the main navigation method widely used in the fields of aerospace, aviation and maritime space. At present the measure to evaluate the performance of the Inertial Navigation System is simple and the pertinence is not strong, meantime the assessments lack ideal laboratory environmental and criteria. Due to these problems, we built a platform which can evaluate the algorithm of the Strapdown Integrated Navigation system. This platform used LabVIEW developing environment and a distributed architecture. During the development course of the Strapdown Integrated Navigation system the platform can achieve a series of functions including trajectory simulation, data simulation and algorithm evaluation etc. It provided a good virtual environment for testing and developing practical navigation system.At the beginning of this thesis, the principle of SINS and system simulation methods are elaborated. Then this thesis introduced the concept of virtual instrument. I analyzed the feasibility and the necessity of the system simulation based on virtual environment. According to the design flow, this thesis completed the mathematical modeling of data generation and data solution. After the simulations and experiments under LabVIEW environment, I established a free combination of a variety of flight track system that can display the flight speed, position and attitude information in real-time. This thesis also established an error model for air resistance, and did some tests on this platform. After the comparison with ideal simulation data, we received a credible conclusion which demonstrated the practicality of the platform. In the algorithm test, Runge-Kutta method and the Picard approximation method were used to make the solution for the matrix equation of the profile calculation, and I evaluated the data obtained. The results showed that the experimental conclusion is consistent with the theory; the design of the platform is valid.This paper also researched the possibility of hybrid programming using virtual instruments-LabVIEW. And take C language for example to achieve the program calls. In order to carry out more complex simulation of the foundation in the future this thesis made the solution for the program's transplantation to the embedded hardware platform.