Propagation Characteristics of Pseudolite Array Signals Indoors

Multipath effect is considered to be one of the main factors affecting the positioning accuracy of pseudolite. Using antenna array to generate strong directional signal as an advanced multipath suppression method can be applied to pseudolite indoor positioning, but the indoor pseudolite array signal propagation effect is an important but not well solved problem. This paper mainly studies the propagation direction and received power of indoor pseudolite array signals. In this paper, a pseudolite array antenna structure suitable for indoor positioning and pseudolite array indoor positioning algorithm are proposed for the special signal system of pseudolite. Combined with the indoor practical application environment of pseudolite, the propagation direction and received power of the isotropic antenna and two special uniform linear arrays in the room are verified by the image method. The results show that the lobes of the two array-type pseudolite antennas are more concentrated than the isotropic antenna, and the energy can be concentrated more from the side lobes to the main lobe, and the radiation range is relatively large. At the same time, the two array antennas can generate high gain in the direction of arrival of the useful signal, and the received power can reach the maximum value of −40 dB, and the interference signal is attenuated, which provides the possibility for the establishment of the remote pseudolite transmission link.

[1]  Antonio Clemente,et al.  Analysis of electrical dipole linear array maximum directivity , 2015, 2015 9th European Conference on Antennas and Propagation (EuCAP).

[2]  Detection and localization of emitters in the presence of multipath using a uniform linear antenna array , 2008, 2008 5th IEEE Sensor Array and Multichannel Signal Processing Workshop.

[3]  Nel Samama,et al.  A GNSS-based inverted radar for carrier phase absolute indoor positioning purposes first experimental results with GPS signals , 2016, 2016 International Conference on Indoor Positioning and Indoor Navigation (IPIN).

[4]  Gérard Lachapelle,et al.  Pseudolite interference mitigation and signal enhancements using an antenna array , 2015, 2015 International Conference on Indoor Positioning and Indoor Navigation (IPIN).

[5]  M. Fujii.  Joint processing of an adaptive array and an MLSE for multipath channels , 1996, Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference.

[6]  Koichiro Wakasugi,et al.  Configurations and performance evaluations for a long-delay multipath interference based on the combinational use of an adaptive array antenna and multipath equalizers , 2011, The 2011 International Conference on Advanced Technologies for Communications (ATC 2011).

[7]  Svante Björklund,et al.  Measurement and analysis of multipath by a rough surface reflector using a digital array antenna , 1999, ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359).

[8]  Analytical formulas for the directivity of general antenna arrays , 2012 .

[9]  Lei Zhang,et al.  A minimum variance beamformer with linear and quadratic constraints based on uniform linear antenna arrays , 2009, 2009 Loughborough Antennas & Propagation Conference.

[10]  Nel Samama,et al.  A new approach for decimeter accurate GNSS indoor positioning using Carrier Phase Measurements , 2013, International Conference on Indoor Positioning and Indoor Navigation.

[11]  Jesus Selva.  An efficient Newton-type method for the computation of ML estimators in a uniform linear array , 2005, IEEE Transactions on Signal Processing.

[13]  J. K. Ray,et al.  Use of Multiple Antennas to Mitigate Carrier Phase Multipath in Reference Stations , 1999 .

[14]  S. Vathsal,et al.  Reducing Multipath Effects in Indoor Channel for Analysis of GPS/Pseudolite Signal Acquisition , 2013 .