A GPS-slaved time synchronization system for hybrid navigation

For multisensor integration, a primary prerequisite is time synchronization. Methods that have been used in many operational systems are either too expensive, or have inconvenient features, that make them inappropriate for re-search purposes. In this paper, the system design of a cost effective synchronization system (CESS) is described. Tests show that a synchronization accuracy of 0.4 ms can be achieved using this system. A land trial of GPS/INS integration verified that the CESS is accurate enough for most low-cost sensor integration applications. However, a more accurate synchronization can be achieved by minor modifications to the CESS. This system provides an ideal platform for researchers to build their own integrated multisensor systems.