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The threshold value used in receiver autonomous integrity monitoring algorithms to identify faults has a significant impact on positioning integrity and GPS/GNSS availability. The value is usually selected empirically or under certain distribution assumptions; its calculation for a non-Gaussian test statistic has not been solved. For fault detection methods using a particle filter, a new heuristic...
The basic principle of attitude determination by multi-antenna GPS technology is discussed and the algorithm model is established. According to the problems in the applications, the RAIM algorithm is used in the GPS attitude determination. The performance of this system is improved in this paper. The test result and the accuracy analysis have demonstrated that the new method used in attitude determination...
A comparable analysis is made on calculating the usual least squares and total least squares (TLS) solution of an over-determined system, which deals with uncertainties on the sensitivity matrix and the erroneous perturbation in the transformation and back-substitution. In this paper the TLS method provides a clearer understanding of the problems and provides a solution expressed in closed form. The...
In the global positioning system (GPS), code division multiple access (CDMA) signals are used. Because of the known spectral characteristics of the CDMA signal, continuous wave (CW) interference has a predictable effect on the different pseudo random noise (PRN) spreading codes (unique to each satellite) depending on the Doppler frequency of the signal. The Doppler frequency for each signal is also...
In safety-critical applications, the set of possible faults have to be divided into two groupes : the first groupe represents the subset of faults which lead to a system failure and the second one - the subset of faults which do not lead (at least immediately) to a failure. The detection/exclusion of a fault from the second group is considered as a false alarm. The problem of GNSS integrity monitoring...
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