Context-aware peer-to-peer and cooperative positioning (original) (raw)
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Peer-to-peer cooperation for GPS positioning
International Journal of Satellite Communications and Networking, 2016
This paper presents a peer-to-peer cooperative positioning technique together with its performance assessment. The cooperation between the two GPS receivers is realized by means of a wireless LAN connection and is significantly influenced by the accurateness of the synchronization between the two terminals. Both the outdoorto-indoor and outdoor-to-outdoor scenarios are considered. For each scenario, we assess the satellite signal acquisition and its computational load and the performance in terms of position accuracy and time-to-first-fix of the positioning procedure.
CAPTURE – “ Widening the Net ” – Indoor Positioning using Cooperative Techniques
2016
Context is fast becoming a fundamental requirement in modern day application development. Key to this requirement is the accuracy of the contextualized information being processed. Incorrectly interpreted context can lead to a missed opportunity or an inappropriate user interruption. Location is arguably one of the most significant contexts that can add value to an applications perceived intelligence. Timely and accurate knowledge of a user’s position can vastly improve the precision of contextualized information. Global Navigation Satellite Systems (GNSSs) such as the Global Positioning System (GPS) have the capacity to locate a mobile device with enough precision to provide adequate context to nearly any application purpose. More importantly, it has the coverage to do so at a global level, with 24 satellites with an almost unobstructed view, providing the necessary infrastructure to deliver such vast yields. Unfortunately, GPS positioning signals do not have the strength to penetr...
Peer-to-Peer Cooperative Positioning: Part I: GNSS Aided Acquisition
m a r c h /a p r i l 2 0 1 2 InsideGNSS 55 A s part of an effort to find meth-ods that improve the perfor-mance of GNSS receivers in hostile environments, this article examines a cooperative position-ing, where receivers exchange data and information with their neighbors or peers. We focus on unstructured peer-to-peer (P2P) networks, without a control or data fusion center. Our discussion will show that a significant reduction of the acquisi-tion time can indeed be achieved when GNSS aiding quantities like Doppler, satellite carrier-to-noise ratio (C/N 0), and secondary code delay are provided by some aiding peers. The approach is clearly similar to that of assisted-GNSS (AGNSS), but does not require a fixed infrastructure and may better take into account the local environment. As multi-standard devices will become more and more inter-connect-ed in the near future, GNSS cooperative positioning may soon become an alter-native or a complement to fixed augmen-tation systems.
In this second part of a discussion of peer-to-peer cooperative positioning, we revisit the topic of sharing critical information across clusters of GNSS users. This article focuses on users within GNSS-challenged environments equipped with both a GNSS receiver and a terrestrial ranging system. Multiple methods for sharing position information across users are examined. The authors show that strategically sharing information can greatly enhance the availability of the position solutions to the network as a whole.
DGNSS Cooperative Positioning in Mobile Smart Devices: a Proof of Concept
In recent years positioning and navigation capabilities in mobile devices have become essential to the evergrowing number of position-related smart applications. Global Navigation Satellite System (GNSS) constitutes the provider for geo-localization, therefore consumer-grade, embedded GNSS receivers have become ubiquitous in mobile smart devices. Among these, smartphones play a dominant role in enabling such modern services based on position information. However, GNSS positioning shows several weaknesses in urban contexts where mobile smart devices are massively diffused. Indeed, the limited sky visibility and multipath scattering induced by buildings severely threat the quality of the final solution. Two main ingredients can enable innovative collaborative strategies capable to increase the robustness of GNSS navigation: The availability of raw GNSS measurements which have been recently disclosed in ultra-low cost smartphone chipsets and the ubiquitous connectivity provided by mode...
Cramér-Rao Bound for Hybrid Peer-to-Peer Positioning
Novel cooperative positioning methods have been proposed to operate in GPS-challenged environments. However, such cooperative schemes can be also used in combination with GPS, so as to improve positioning accuracy in cases where GPS measurements are available (i) intermittently; or (ii) from a limited number of satellites; or (iii) are strongly affected by noise or multi-path. “Hybrid cooperative positioning” schemes can thus be designed to fuse information from peers and from GPS satellites. This contribution provides a theoretical characterization of achievable performance of hybrid cooperative positioning, by expressing the Cramér-Rao lower bound (CRLB) for the aforementioned scenario. Our results extend [?], by including the unknown clock bias, and [?], by taking into account satellites in addition to terrestrial devices.
Indoor positioning in peer-to-peer networks
2010
We present two algorithms for indoor positioning in peer-to-peer networks. The setup is a network of two types of devices: reference devices with a known location, and user devices that can determine distances to reference devices and each other. We present two algorithms for positioning estimation in such a peer-to-peer network. The first one is purely geometric and reduces determining the best estimate for the position of a device to a least squares problem. The second approach can be considered as a probabilistic version of the geometric approach. We estimate the probability density function that a device is located at a position, given a probability density function for the positions of the other devices in the network, and a probability density function of the measured distances. ____________________________________________ Brussee, R., Darau, M., Dworczynska, M., Fan, Y., Koeleman, P., Kowalczyk, P., Samson, J., Schlömer, N., Swist, T., Wijk, A.C.C. van (2011). Indoor navigation in peer to peer networks. Proceedings of the 5th ESA Workshop on Satellite Navigation Technologies (NAVITEC 2010, Noordwijk, The Netherlands, December 8-10, 2010). Noordwijk: ESTEC.
Improved GNSS positioning exploiting a vehicular P2P infrastructure
2010 5th Advanced Satellite Multimedia Systems Conference and the 11th Signal Processing for Space Communications Workshop, 2010
This paper considers the possibility to exploit external altitude measurements to improve the performance of a Kalman based GNSS receiver. The altitude measurements are provided by means of a peer to peer network, that is supposed to be based on the evolution of the 802.11 standard for the vehicular environment, namely the WAVE (802.11p). The performance of such a system are investigated for different characteristics of the aiding measurement and for a different number and disposals of the aiding peers. The aiding measurement is obtained starting from the altitude measurements that the other peers in the network send to the aided user. The experiments highlight the need for a parameter that points out the effectiveness and the consistency of the computed aiding measurement, taking into account many parameters such as the number of peers, their distribution in the user cluster and the number of satellites available for the solution computation. To this purpose, a reliability index is defined and the performance of a system that relies on this index are shown.