Abstract
Digital multimedia broadcasting signal is promised to be a wireless positioning signal. This paper mainly studies a multimedia broadcasting technology, named China mobile multimedia broadcasting (CMMB), in the context of positioning. Theoretical and practical analysis on the CMMB signal suggests that the existing CMMB signal does not have the meter positioning capability. So, the CMMB system has been modified to achieve meter positioning capability by multiplexing the CMMB signal and pseudo codes in the same frequency band. The time difference of arrival (TDOA) estimation method is used in base station positioning receivers. Due to the influence of a complex fading channel and the limited bandwidth of receivers, the regular tracking method based on pseudo code ranging is difficult to provide continuous and accurate TDOA estimations. A pseudorange measurement scheme based on snapshot is proposed to solve the problem. This algorithm extracts the TDOA estimation from the stored signal fragments, and utilizes the Taylor expansion of the autocorrelation function to improve the TDOA estimation accuracy. Monte Carlo simulations and real data tests show that the proposed algorithm can significantly reduce the TDOA estimation error for base station positioning receivers, and then the modified CMMB system achieves meter positioning accuracy.
Highlights
As the main positioning technology, global navigation satellite systems (GNSS) have many advantages, such as large coverage area, high positioning accuracy, and fine robust [1]
Due to the influence of a complex fading channel and the limited bandwidth of receivers, the regular tracking method based on pseudo code ranging is difficult to provide continuous and accurate time difference of arrival (TDOA) estimations
Monte Carlo simulations and real data tests show that the proposed algorithm can significantly reduce the TDOA estimation error for base station positioning receivers, and the modified China mobile multimedia broadcasting (CMMB) system achieves meter positioning accuracy
Summary
As the main positioning technology, global navigation satellite systems (GNSS) have many advantages, such as large coverage area, high positioning accuracy, and fine robust [1]. Due to pseudorange codes being added in the modified CMMB system, the signals from different stations can be tracked using similar GNSS receiver tracking algorithms. Is themodel, main pseudorange signal and pseudo codes, is given and the autocorrelation function with band-limited is measurement method and the key to achieve high accuracy positioning. The non-causal smoothing estimator is added to improve the measurement accuracy in snapshot GNSS receivers [16,17], but the premise of the algorithm is that the weak signal must be stable tracking.
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