DIGITAL STATISTICAL SIMULATION MODEL OF SIGNAL PROCESSING IN NAVIGATION EQUIPMENT OF CONSUMERS OF SATELLITE RADIO NAVIGATION SYSTEMS
Currently, consumer navigation equipment (CEN) satellite radio navigation systems (SRNS) are installed on board all, without exception, moving objects (satellites, drones, ships, cars, etc.), allowing to determine the geographical position of an object in space (coordinates) and its linear velocity with the required accuracy depending on the targets. However, movable objects of a special purpose, functioning in the interests of the various law enforcement agencies and structures are also equipped with such navigation systems. In this case, it is necessary to pay particular attention to noise immunity of navigation equipment of consumers of satellite navigation systems in the presence of intentional interference that can destabilize the operation of the navigation equipment (lead to a breakdown in maintenance mode) or cause a large error in the measurements of coordinates and velocities (in the measurement mode). As a criterion for the effectiveness of the interference effect on the CEN SRNS, we adopted an exposure coefficient showing the minimum threshold for the excess of the interference signal power over a useful navigation signal, leading to the failure of tracking for no more than 5 seconds with a probability of at least 0.9. The developed digital statistical simulation model of the signal processing process in the CEN SRNS is presented, the effect of noise, signal-like and harmonic interference on the number of tracking failures is modeled, the probabilities of the failures are calculated, and the quantitative values of the exposure coefficients leading to the disruption of the functioning of the SRNS are calculated