Error analysis of a Doppler ¿ Inertial navigation system by analog simulation

Described is a simulation allowing the determination of latitude and longitude errors, generated in a Doppler ¿ inertial navigation system, due to numerous sources. Errors in navigation systems are small and would be obscured in a direct simulation of the system. By simulating the error equations, the influence of error sources and of system parameters on latitude and longitude errors can be readily determined. To demonstrate the value of the simulation, some data resulting from simulated flights are presented.