The Risk Analysis Of Pseudolite And Satellite
Navigation System
Author(s)
J. Taufer & L. Bazant
Abstract
The modern navigation and positioning methods are increasingly used in safety
related applications. These methods are able to pursue navigation functions with
very high accuracy and also with high frequency. Safety applications also require
risk analysis of the methods used. The indivisible part of such an analysis must
be integrity monitoring (IM) of the positioning solution.
Today, the meaning of satellite navigation system (GNSS) increases. But for
many applications, especially for transport systems, the satellite navigation in
itself may not be sufficient due to the visibility of only a small number of
satellites, or none at all, at the time of a safety critical event, high safety
requirements etc. In this case, the system must be completed with another
system. Most often it’s the system of inertial sensors, but it is also possible to use
the system of ground transmitters of the satellite signal – the system of
pseudolites (PL’s). Such a system is \“ground equivalent” to the satellites system,
but it has certain specifics, namely accurately defined and fixed position of
signal transmitters, warranted availability in the required area. These specifics
are significant for design of IM.
The applications based on satellites and PL’s navigation system can be
designed in two ways. The first way is a direct combination of signals from
satellites and PL’s in one receiver and one solution of position together with one
risk analysis.
It assumes the time synchronization of GNSS and PL’s system (synchr. PL’s
according to GNSS time). The advantage of this way is the possibility of using
so-called \“Assisted GPS” (A-GPS). The second way is using two independent
channels – one for PL’s system and the second for GNSS and a combination of
both independent solutions and also their risk analysis.
Keywords: pseudolites, safe positioning, integrity monitoring.
Keywords
pseudolites, safe positioning, integrity monitoring.
Related Book
Other papers in this volume
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