Coherent Time Difference of Arrival Estimation Techniques by Alexander Gerald Götz

By Alexander Gerald Götz

During this paintings, coherent suggestions for time distinction of arrival estimation for frequency hopping GSM signs are brought. The suggestions offer major advancements in accuracy in comparison to cutting-edge strategies and are supreme for hugely actual localization of GSM cell phones. the major artistic notion relies at the interpretation of a frequency hopping GSM sign as a wideband sign. hence, the appropriate bandwidth for time distinction of arrival estimation should be elevated from 2 hundred kHz for the narrowband burst sign to the complete uplink bandwidth of the corresponding GSM regular. For E-GSM 900 structures, as much as 35 MHz of bandwidth will be hired. hence, a localization accuracy within the scale of five - 10m is achieveable. The awarded coherent concepts for time distinction of arrival estimation enable novel functions with elevated accuracy requisites equivalent to hugely actual localization in seek and rescue situations. moreover, the coherent estimation suggestion can be tailored to any frequency hopping sign resource akin to TETRA, DECT, IEEE 802.15.4 (ZigBee) and IEEE 802.15.1 (Bluetooth) units.

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2) sBurst,BB (t, bn )e j(2πΔfn t+Δφn ) ∗ δ(t − nTF rame ) n=0 with 0 ≤ t ≤ NTF rame The frequency of the local oscillator fLO may be chosen arbitrarily as long as all burst signals lie within the acquisition bandwidth of the frontend. e. 3) n=0 yielding an acquired signal with zero mean value. Otherwise the mean value should be removed before applying the techniques for time difference of arrival estimation. . . n+3 n+2 n+1 n n-1 n-2 n-3 . . Wideband Frontend FDMA Channel Number The coherent signal acquisition using a wideband frontend is depicted in Fig.

Since the basic operation is the time difference of arrival estimation between two receiving stations, this case is focused in the following. 11) The signal is transmitted through the radio channel and is subject to noise and multipath propagation. The elementary setup for the time difference of arrival estimation is depicted in Fig. 4. 4: Elementary setup for the time difference of arrival estimation The main goal of the presented techniques is the estimation of the Time Difference of Arrival (TDOA) between the two received signals at the corresponding receiving stations.

The carrier frequencies fc,n correspond to the applied frequency hopping scheme and have a major impact on the performance of the time difference of arrival estimation techniques. The initial phase angles of the local oscillator φc,n take random values in consecutive bursts since the local oscillator in GSM mobile stations is turned off during unused time slots and starts up with random oscillation phase. Therefore, this sequence can not be influenced or used as a design parameter. e. only the phase differences of consecutive symbols within one burst are important.

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