| 摘要 |
The invention relates to a method for determining the risk of integrity during the use of satellite signals from a satellite, said method comprising the following steps: (a) a characteristic value is supplied for the forecast of the local and temporal inaccuracy of the radiation event of the satellite signal; (b) integrity data (ID) is supplied for at least some of the satellites containing an integrity flag that indicates whether the corresponding satellite signal is ok or not ok , and a characteristic value for the accuracy determined from satellite signals, in the local and temporal inaccuracy of the radiation event; (c) at least two threshold values are supplied, a first threshold value being used for a first hypothesis indicating that the satellite is not "ok", and a second smaller threshold value being used for a second hypothesis indicating that two satellites are not ok simultaneously; (d) a zero risk of integrity is determined for a zero hypothesis indicating that all satellites with an integrity flag signalling ok operate without error, on the basis of the characteristic value for the forecast of the local and temporal inaccuracy of the radiation event of the satellite signal; (e) a first risk of integrity is determined for a first hypothesis indicating that one of the satellites with an integrity flag signalling ok is not operating without error, on the basis of the characteristic value for the accuracy determined from satellite signals, in the local and temporal inaccuracy of the radiation event, the characteristic value for the forecast of the local and temporal inaccuracy of the radiation event of the satellite signal, and the first threshold value; (f) a second risk of integrity is determined for a second hypothesis indicating that two of the satellites with an integrity flag signalling ok are not operating without error simultaneously, on the basis of the characteristic value for the accuracy determined from satellite signals, in the local and temporal inaccuracy of the radiation event, the characteristic value for the forecast of the local and temporal inaccuracy of the radiation event of the satellite signal, and the second threshold value; and (g) the entire risk of integrity is determined from the risks of integrity determined in steps (d) to (f). |
