DEVICE FOR CHECKING THE CONSISTENCY OF BROADCAST INFORMATION, WITH NO CONSTRAINTS ON THE CLOCKS OF THE MONITORING STATIONS, FOR A SATELLITE NAVIGATION SYSTEM

摘要

The invention relates to a device (D) which is dedicated to checking the consistency of information broadcast by satellites (SA1-SA3) within a computing station (SG) of a satellite navigation system. The inventive device (D) comprises processing means (MT) and, upon reception of data representative of pseudo-distances which are determined essentially simultaneously by each monitoring station (SC1-SC4) of the system in relation to each satellite within sight and of corresponding navigation messages broadcast by said satellites and of the times at which they are received by the monitoring stations, said processing means (MT) are used to: i) define and solve a system of equations of the type having formula (I); and ii) generate an alarm each time the result of a combination between a selected projection of the geometric error in relation to the orbital positioning of a satellite (SA1) and a distance representative of the difference between the estimated clock offset and a predicted clock offset for said satellite (SA1) is above a selected threshold.