Method for determining at a central station a time sequence of remote station parameters in association with each of a plurality of remote stations (102, 103, 104) of a surveillance system, the method being performed by the central station and including: Obtaining, using a respective communication link, a time sequence of epochs of distance observations made at each of the plurality of remote stations and combined real time processing of the epochs to determine a time sequence of remote station parameters in association with each of the plurality of remote stations, wherein an epoch includes at least distance observations at a remote station at a particular instant in time; detecting an interruption of a first communication link between a first remote station of the plurality of remote stations and the central station; halting the combined real time processing of the epochs from the plurality of remote stations during the interruption of the first communication link; intermediate storing of epochs of distance observations for each of remaining remote stations of the plurality of remote stations at the central station during the interruption of the first communication link; detecting reestablishment of the first communication link; receiving intermediately stored epochs of distance observations made at the first remote station through the reestablished first communication link; and combined recapture processing of the received intermediately stored epochs of distance observations made at the first remote station and the remaining remote stations after reestablishment of the first communication link, to determine history remote station parameters in association with each of the remote stations during the interruption of the first communication link. Obtaining, using a respective communication link, a time sequence of epochs of distance observations made at each of the plurality of remote stations and combined real time processing of the epochs to determine a time sequence of remote station parameters in association with each of the plurality of remote stations, wherein an epoch includes at least distance observations at a remote station at a particular instant in time; detecting an interruption of a first communication link between a first remote station of the plurality of remote stations and the central station; halting the combined real time processing of the epochs from the plurality of remote stations during the interruption of the first communication link; intermediate storing of epochs of distance observations for each of remaining remote stations of the plurality of remote stations at the central station during the interruption of the first communication link; detecting reestablishment of the first communication link; receiving intermediately stored epochs of distance observations made at the first remote station through the reestablished first communication link; and combined recapture processing of the received intermediately stored epochs of distance observations made at the first remote station and the remaining remote stations after reestablishment of the first communication link, to determine history remote station parameters in association with each of the remote stations during the interruption of the first communication link.