Abstract
For timing and synchronization system, digital phase-locked loop (DPLL) and Kalman filter all have been widely used as the clock tracking and clock correction schemes for the similar structure and properties. This paper compares the two schemes used for ultrawideband (UWB) location system. The improved Kalman filter is more immune to interference.
Highlights
Impulse radio ultrawideband (IR-UWB) [1] is considered to be promising for indoor location
Kalman filter is the solution by the minimum mean square error (MMSE) of the optimal linear filtering [9, 10]
By the theory of hypothesis, in order to give sufficient information for the Digital phase-locked loop (DPLL) to stay locked for continued real-time location system operation with good performance, we need to send the clock synchronization message more frequently than for Kalman filter
Summary
Impulse radio ultrawideband (IR-UWB) [1] is considered to be promising for indoor location. The clock variance between the passive anchor’s local clock and its reference anchor is tracked. How to track the clock variance between reference-passive anchors is important for UWB location. The clock tracking is implemented with the main “process” function taking two inputs: (1) The slave anchor CCP receiving time with its time base. This paper compares the two schemes used for UWB location system
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