| 摘要 |
A multilateration system 1 is disclosed in which receivers 2-6 are grouped into two groups (A,B,Fig3). The first group is used to determine a position of a signal source, for example, an aircraft 14 equipped with a SAR transponder. From the determined position, predicted time of arrival values are produced for the second group of receivers. These are compared with the actual time of arrival values for the signals arriving at the second group of receivers. A difference is determined and then the variation of that difference is determined as the aircraft travels along route. The groupings are then varied and further variations determined. When the minimum variation is determined, an alert is given that the second group has a receiver which is operating with a larger than desirable group time delay. |
