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.
Highlights
Geographic location information can be retrieved by various infrastructures and technologies
The proposed position location is achieved based on multiple distance measurements between known reference points, that is, signals from different digital TV (DTV) transmitters have to be identified for the determination of the geographic coordinates
Due to the large N for transmitter identification sequence, central limit theorem can be applied to the second and third items in (4), whose variances can be determined as NA2σd2 and Nσw2, where σd2 and σw2 are the variances of the DTV signal and additive white Gaussian noise (AWGN) noise
Summary
Geographic location information can be retrieved by various infrastructures and technologies. A new position location system is proposed based on DTV transmitter identification watermarks. The proposed DTV position location system and the subsequent analysis are based on the transmitter identification watermark. One interesting new feature of the ATSC signal is that a pseudorandom sequence, used as an RF watermark, can be uniquely assigned to each DTV transmitter for transmitter identification (TxID) purpose [8]. The proposed position location process using DTV TxID or watermarked signal, can be realized through several steps. (1) Identify the sources for all DTV signals received at one location This is based on the calculation of cross-correlation between the DTV signals and local TxID sequences.
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