A New Position Location System Using DTV Transmitter Identification Watermark Signals

Abstract

A new position location technique using the transmitter identification (TxID) RF watermark in the digital TV (DTV) signals is proposed in this paper. Conventional global positioning system (GPS) usually does not work well inside buildings due to the high frequency and weak field strength of the signal. In contrast to the GPS, the DTV signals are received from transmitters at relatively short distance, while the broadcast transmitters operate at levels up to the megawatts effective radiated power (ERP). Also the RF frequency of the DTV signal is much lower than the GPS, which makes it easier for the signal to penetrate buildings and other objects. The proposed position location system based on DTV TxID signal is presented in this paper. Practical receiver implementation issues including nonideal correlation and synchronization are analyzed and discussed. Performance of the proposed technique is evaluated through Monte Carlo simulations and compared with other existing position location systems. Possible ways to improve the accuracy of the new position location system is discussed.

Joint Wireless Positioning and Emitter Identification in DVB-T Single Frequency Networks

“…The emitter confusion problem has been addressed in some literature [9], [10], [11], [12]. Specifically, the watermarking techniques have been proposed for the emitter identification in DTV systems, which include the systems based on the Advanced Television Systems Committee (ATSC) standards [9] and that on the DVB-T2 standards [10].…”

“…Specifically, the watermarking techniques have been proposed for the emitter identification in DTV systems, which include the systems based on the Advanced Television Systems Committee (ATSC) standards [9] and that on the DVB-T2 standards [10]. However, applying the watermarking techniques has to change the structure of the transmitted DTV signals, which leads to extra cost for updating the whole DTV system.…”

“…Our EMP algorithm iteratively identifies the DTV emitters and estimates the position of the receiver, with the aid of the pseudo-ranges measured by the receiver based on its received signals from the different DTV stations. In comparison with the existing approaches [9], [10], our proposed method does not require to modify the structure of the existing DTV signals. Hence, it is suitable for both static and mobile receivers to carry out their positioning.…”

Positioning in Chinese Digital Television Network Using TDS-OFDM Signals

“…The positioning scheme by inserting orthogonal Kasami sequences into normal TV signals was proposed in [2] for American DTV standard set forth by the advanced television systems committee (ATSC), but it required some modifications of the current DTV infrastructure. The positioning method based on correlation of frequency-domain pilots was presented for European digital video broadcastingterrestrial (DVB-T) systems, and the achievable accuracy was several meters [3].…”

“…The first one uses the traditional or improved correlation-based timing synchronization algorithms to locate the OFDM block boundaries [5]. The positioning schemes used for DTV systems, including ATSC and DVB-T [2], [3], all belong to this category. These schemes have low complexity but their accuracies are directly limited by sampling rate, and generally an error of several meters is expected.…”