Extraction of Time and Frequency Difference between Two Signals from One Radio Source

Document Type : -

Authors

1 Sharif University / Master's student

2 Department of Electrical Engineering /Sharif University of Technology

Abstract

In this paper, a new method for obtaining the time and frequency difference of arrival (TDOA and FDOA) between two received signals, namely the direct path signal and its echoes from other paths, is proposed. In most of the localization methods, we need to derive the time and frequency difference information between two signals in the first step, and then geometric methods are employed to locate the radio source in the next step. The grid search method is among the available methods that obtains the time and frequency differences, but with large time consumption and high computational complexity, especially in high resolution search demands. In contrast to existing works, our proposed method independently estimates each of the time and frequency difference values. This method no longer faces the two-dimensional grid search problems, and whilst estimating the related values it also suppresses the direct path signal that can prevent the detection of the reflected echo signals. The performance superiority of our proposed method is more evident when the reflected signal is much weaker than the direct path signal.

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References

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History

  • Receive Date: 17 November 2021
  • Revise Date: 09 April 2022
  • Accept Date: 29 April 2022

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