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Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
The global navigation market (products and services) is expected to grow to more than 160 billion EUR revenue by 2015 with significant growth being driven by mobile terminals. The pillars of the future wireless society will be the trustworthiness of the wireless positioning device and ecofriendliness of the transmission-reception process. These are triggered by the user needs, preferences and targeted...
The new GNSS systems available present possibilities and challenges in the design of modern GNSS receivers. As a part of this challenge, receiver testing is always very important aspect. Careful testing procedures tend to be slow and tedious. In this paper we present a method for speeding up the test process without limiting the testing capabilities. The proposed method is only applicable to testing...
In this article we present the P3 (Public Precise Positioning) Service project where network GNSS data are combined with a consumer-grade receiver. P3 utilizes the Finnish national FinnRef GNSS network which is operated by the Finnish government and available free of charge to the general public. The project investigates the use of network real-time kinematics (RTK) and real-time precise point positioning...
This paper proposes a novel technique to enhance the performance of grid-based Radio Frequency (RF) fingerprint position estimation framework. First enhancement is an introduction of two overlapping grids of training signatures. As the second enhancement, the location of the testing signature is estimated to be a weighted geometric center of a set of nearest grid units whereas in a traditional grid-based...
The error covariance reported by an estimation is said to be consistent if it is a reliable indicator of the actual error. In this paper several types of consistency are defined, and methods for its evaluation are introduced. Mean Squared Deviation consistency is based on the Chebyshev inequality, p equivalence is based on the fact that the concentration ellipse with probability mass p must contain...
We present an initial state correction algorithm for GNSS orbit prediction that uses the solution of the Hill-Clohessy-Wiltshire equation to build the Jacobian matrix. This algorithm improves the accuracy of GNSS orbit prediction through adding one or more observations. In the tests of 14 days orbit prediction, by adding one broadcast ephemeris as an observation collected before the initial BE with...
Multipath mitigation has attracted the attention of many researchers, thus leading to outstanding contributions in the past years. In contrast, multipath detection has not benefited that much. It has remained in background, with most of the current state of the art still relying on classical detection techniques. In this paper, we take a leap forward in multipath detection, and we propose a CUSUM-based...
Many professional communities nowadays require precise and accurate position information. Although various location technologies are integrated in one device, GNSS remains one of the main sources of precise positioning information. Traditionally, GNSS precise positioning has been achieved in relative mode using differential principles. On the other hand, with the technological advances in GNSS technology...
Adaptive notch filters have been proven to be effective solutions for mitigating the impact of jamming and extending the operational capabilities of GNSS receivers.
The wearable devices market has witnessed major technological advancements in recent years. These achievements have greatly increased their ability to be involved in applications such as location-based services (LBS), portable navigation, and guidance applications. In certain applications, providing a navigation solution based on inertial sensors stand-alone requires the user to keep the portable...
This paper presents the silicon area estimation of three different GNSS receiver architectures with the analysis of four different use cases. The receivers are based on traditional correlator, matched filter, and group correlator architectures. While introducing the selected test cases, the authors discuss their applicability for real-life receiver operations. The receiver architectures are described...
Timing approaches, such as time of arrival (TOA) and time difference of arrival (TDOA), employed with DVB-T are sensitive to the presence of multipath errors. This paper studies the delay estimation in adverse multipath scenarios using the DVB-T signals. A data-directed delay tracking mechanism is presented for signal tracking to estimate the time delay. Three different delay locked loops (DLLs) are...
Increasing sensitivity and robustness of navigation receivers in hostile environments has become a central topic for the GNSS community. The paper investigates the use of assistance information allowing GNSS receivers' operations even in denied environments, characterized by high dynamics and low C/N0. The main assistance information will be discussed and, for each of them, a set of requirements definition...
Pseudolites have the potential to extend Global Navigation Satellite System (GNSS) usage to environments where GNSS navigation is usually precluded. This also applies to asynchronous pseudolite systems, i.e. systems where the different pseudolites operate in an independent way and have the potential to enable metre level navigation. Asynchronous pseudolite systems require however dedicated strategies...
PVT accuracy, in GNSS-based navigation, depends on various factors such as the quality of the measurements and the broadcast navigation data. GNSS broadcast signals (in L-band) are strongly influenced by the atmospheric layers. In particular ionospheric effects are the most important in open-sky. The ionosphere effect can be reduced using linear combination of dual frequencies measurements or differential...
Indoor localization based on Received Signal Strengths (RSS) or on some form of power measurements is a low-cost and low-complexity solution gaining more and more interest in the research and commercial worlds. Typically, Wireless Local Area Network (WLAN) signals are employed for such purpose, due to the fact that they are widely spread in indoor environments. Nevertheless, any wireless signal available...
Recently, an increasing trend of GNSS-based Safety Critical (SC) or Liability Critical (LC) urban applications has been observed. These applications, associated to dense urban canyons, can have very stringent requirements in terms of accuracy, reliability and availability of the provided position solution. In this paper, the implementation of a step-by-step algorithm able to ensure the robustness...
In this paper we estimate the effect of coverage gaps and inaccurate Received Signal Strength (RSS) values in fingerprinting based indoor localization using Wireless Local Area Networks (WLAN). The results are based on extensive measurement campaign including two multi-storey buddings with over 700 found WLAN access points in total. We introduce a novel randomized method to artificially create realistic...
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