Abstract: A computer system and method for accurately transforming multiple returns received by multiple satellites from multiple targets into a set of single accurate tracks for each target. Observations from multiple satellites create partial or resulting tracks. These resulting tracks are then correlated with pre-existing base tracks by a series of steps in which resulting tracks are paired with pre-determined base tracks according to a series of criteria. Pairs based on: common observation points and time spans, common satellites, and lack of common satellite, are considered sequentially. The final attempt at correlation consists of pairing each remaining track with each base track and using profile dependent piece correlation of the pairs. Any remaining resulting tracks are then added to the set of base tracks.

Abstract: A system and method are disclosed for analyzing operation of an ink jet head. Initiation of start-up is sensed, as is the pressure build-up in the ink jet head as ink is supplied thereto. The time lapse between initiation of start-up and the commencement of pressure build-up is determined, as is the time required for the pressure within the ink jet head to build to an operational level, and outputs indicative thereof are utilized for determination of fault occurrence and indication of faults or initiation of fault correction in response thereto. The system includes a pair of counters controlled by start-up initiation and the outputs from a pair of comparators which receive predetermined reference signals and signals indicative of pressure build-up at the ink jet head, with the outputs from the counters being coupled to a microcomputer for determination of faults.