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In the multi-sensor data fusion system, the data acquired by each sensor which will be fused should be at the same time level so that the correct state can be worked out. But actually the time error exists for the delay of the data transmission and the disaccord of the sampling cycles of the sensors. The time error has great effect on the measured distance data and the distance varying rate data, so registration must be completed before fusion. In this article several commonly used time registration algorithms are analyzed and simulation tests have been respectively carried out to get some useful results.