Hybrid Positioning With DTMB And LTE Signals

In this paper, digital terrestrial multimedia broadcast (DTMB) signals and long term evolution (LTE) signals are used for hybrid positioning in urban environment. This paper mainly introduces the time of arrival (TOA) estimation of DTMB by using the method of PN sequence correlation. In the multipath environment, constant false alarm rate (CFAR) detector and matched pursuit (MP) algorithm are used to estimate the direct path. With the pseudo-range of DTMB and LTE signals, we used extended Kalman filter (EKF) to fix a position. In the experiment, the DTMB signals can be used for the supplement of LTE signals to achieve the hybrid positioning in urban environment. Compared to positioning method with LTE only, the hybrid positioning system with DTMB-LTE improved the availability of positioning by 27% over a trajectory of 600m. The 2-D position root-mean squared error (RMSE) of DTMB-LTE system was improved by 4.55m compared to the LTE positioning only over a trajectory of 438m. Furthermore, the proposed system achieved an RMSE of 26.26m over a trajectory of 162m when only 1 LTE and 1 DTMB stations were used. The hybrid positioning system with DTMB-LTE provided an RMSE of 20.45m over a trajectory of 600m.