Patent ID: 8902105

Claim:
Method for determining an integrity indicating parameter which indicates the integrity of positioning information determined from positioning information signals disseminated from a plurality of space vehicles of a satellite positioning system, said method comprising: providing an input parameter, receiving a plurality of integrity information parameters, and determining the integrity indicating parameter on the basis of said input parameter and on the basis of a first relation between said integrity indicating parameter and said input parameter and said plurality of integrity information parameters, wherein determining the integrity indicating parameter comprises calculating a first auxiliary parameter and a second auxiliary parameter on the basis of said input parameter and said plurality of received integrity information parameters, and determining an output parameter in dependence of said first and said second auxiliary parameters on the basis of an auxiliary relation which is a relation between said first and second auxiliary parameters and said output parameter and which corresponds to the first relation between said integrity indicating parameter and said input parameter, said auxiliary relation being provided in the form of a stored two-dimensional look-up table, wherein said output parameter corresponds to said integrity indicating parameter or said integrity indicating parameter is determined from said output parameter.