Indoor Carrier Phase Tracking and Positioning with Difference Correlators

T. Pany, H.-J. Euler, and J. Winkel

Abstract:	Single and double difference (code and carrier) observations are well known concepts in precise positioning to eliminate common mode errors. Difference correlators extend this concept to the level of correlator values. By doing that, the same common mode errors (e.g. clock errors) are cancelled thereby drastically reducing the signal dynamics. Then much smaller loop bandwidths or longer integration times can be applied to reduce noise and to eliminate multipath contributions. For static applications a coherent integration time of 100 s gives a single channel carrier tracking sensitivity of -14 dBHz (!), provided that code and Doppler lock can be achieved by e.g. vector tracking. Indoor carrier phase tracking is possible. Phase delays caused by the penetration of building materials determine the accuracy limit. A method is proposed to identify time windows with approximately constant delays. L1CA and L2CM indoor data show periods of e.g. 16 min, where propagation delays remain within a few centimeters variation and it is possible to compute an indoor position using carrier phases only (no code pseudoranges) with an accuracy of 1 m.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2202 - 2213
Cite this article:	Pany, T., Euler, H.-J., Winkel, J., "Indoor Carrier Phase Tracking and Positioning with Difference Correlators," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2202-2213.
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