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Publication Detail
A Differential Positioning System Using Modulation Correlation of Signals of Opportunity
  • Publication Type:
  • Authors:
    Webb TA, Groves PD, Cross PA, Mason RJ, Harrison JH
  • Publisher:
    Royal Institute of Navigation
  • Publication date:
  • Place of publication:
    London, UK
  • Published proceedings:
    Proceedings of Nav 10: The Navigation Conference & Exhibition: Position, Location, Timing: Everyone, Everything, Everywhere
  • Status:
  • Language:
  • Notes:
    Nav 10 conference was held between 30th November – 2nd December 2010 in London, UK. Full text made available here with permission from the Royal Institute of Navigation
Global Navigation Satellite Systems (GNSS) have become the positioning systems of choice for many applications. However, GNSS signals are susceptible to obstruction, interference and jamming. Therefore, to maximize robustness and integrity, it is necessary to employ a dissimilar positioning technology that can operate independently and back-up GNSS. One such technology exploits ‘signals of opportunity’ – signals that are designed for purposes other than navigation. This paper presents a system that uses amplitude modulation (AM) radio broadcasts in the medium frequency (MF) band. At these frequencies, the predominant ground-wave propagation mode offers better coverage in remote areas and over sea than is achievable with higher frequency signals. The system is differential and operates by correlating modulation information between the reference and user receivers. A system of this form mitigates the deterioration in and around buildings encountered in prior systems and can provide absolute position using fewer signals than a system using only carrier phase. The system presented in this paper uses generalized cross correlation to obtain time difference of arrival measurements that are subsequently used for position determination. Preliminary results indicate the system provides a robust position solution. Moreover, the system offers the potential to be combined with carrier phase measurements to achieve enhanced performance, while the modulation correlation technique is readily extendable to other types of signal.
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