| 摘要 |
A method of reducing the impact of space vehicle clock frequency jumps on a device for position detection in a global navigation system. The method comprises the steps of:
1a) receiving navigation signals from all available space vehicles; 1b) determining the integrity risks of the navigation signals received from the space vehicles in step 1a) ; 1c) sorting the received navigation signals for the smallest individual integrity risk in a sorting list; 1d) determining a first combination of navigation signals with the smallest individual integrity risks from a predetermined number of space vehicles defining a first group of space vehicles;
1e) checking whether the overall integrity risk calculated with the combination of navigation signals of said first group of space vehicles is equal to or lower than a predetermined acceptable maximum risk;
1f) considering for enough available signals or for the first iteration cycle said combination of navigation signals from said group of space vehicles in an integer way, and
1 g) if the condition of step 1 e) is fulfilled
1g1) calculating a navigation solution using the navigation signals of said combination of navigation signals from said group of space vehicles
or
1g2) starting or continuing with a critical operation, respectively,
or else, if the condition of step 1 e) is not fulfilled,
1g3) adding in a safe and integer way navigation signals received from the next space vehicle of said sorting list to the combination of navigation signals of said group of space vehicles used in step 1e) and continuing again with steps 1e), 1f) and 1g). |
