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  • An Open GNSS Receiver Platform Architecture
    (2004) Engel, Frank; Heiser, Gernot; MUMFORD, PETER; Parkinson, Kevin; Rizos, Chris
    Conference Paper
    In this paper we present the concept of an FPGA-based GPS receiver architecture with the aim of providing a framework for investigating new receiver architectures for current and upcoming GNSS standards. This development system facilitates researchers to prove new receiver concepts using real signals, which nowadays can only be simulated using tools such as Matlab. One will be able to work with the satellites as soon as they are operational, rather than having to wait for the availability of commercial products. The system allows individual development of signal processing solutions for base-band processing. A soft-core processor implements higher layer services that provide data to the user.
  • Audio Nomad
    (2006) Woo, Daniel; Mariette, Nicholas; Salter, James; Rizos, Chris; Helyer, Nigel
    Conference Paper
    Audio Nomad comprises a series of cross-disciplinary art/science projects working on the concept of GPS-driven location-based audio applications. Project outcomes in the form of artworks enable a user or audience to experience a virtual audio world situated within the real world, as a spatial composition of sounds seeming to originate from real objects. Two-dimensional audio spatialization simulates realistic sound sources, and non-spatialized sounds may also be used as location-based content. Conceptually, sound is used to reveal information or create an aesthetic, often composed of a combination of oral histories, archival audio, site-specific historical information, field recordings, and music. The outcome is a culturally significant public sound artwork utilizing this new location-based audio medium – an application of global positioning, audio technologies, and software engineering. As GNSS technologies become more ubiquitous, Audio Nomad can take advantage of new platforms such as mobile phones. This unique multidisciplinary collaboration has driven the design of tools with great creative potential to provide new alternative location-based services poised to engage and appeal to the imagination of future GNSS users.
  • Fast code-phase alignment of GPS signals using Virtex-4 FPGAs
    (2007) Malik, Muhammad; Diessel, Oliver; Dempster, Andrew
    Conference Paper
    This paper describes a Virtex-4 based system for aligning the code-phase of a received GPS signal. The core operation involves a multiplication of the received signal with a local replica of the code followed by integration of all possible alignments within the period of one code epoch. A speedup proportional to the code length is thus achieved. We outline the proposed system, which stores the code in on-chip memory blocks and uses both dedicated DSP hardware and user logic to perform MAC operations in parallel. We study area, time and energy usage as the ratio of user logic to custom blocks is varied and identify a design point and corresponding device size for which energy usage is minimized.
  • Syren - A Ship Based Location-Aware Audio Experience
    (2004) Woo, Daniel; Mariette, Nicholas; Helyer, Nigel; Rizos, Chris
    Conference Paper
    Syren, a location-based, multi-speaker augmented audio reality installation was presented as a shipboard exhibit at the 12th International Symposium on Electronic Art in August 2004. It was conceived as a continuous 3-day spatial audio experience that augments the landscape through the Baltic archipelago with location-based audio media, spatialised through a 12- channel speaker array. As the ship tracks between Helsinki, Mariehamn, Stockholm and Tallinn, listeners on the upper deck hear sounds that are perceived to originate from geographic features. Our custom GIS is derived from electronic nautical charting information that includes coastlines, buoys and beacons. A handheld GPS provides both position and direction data that was used by a software system to drive parameters of the spatial audio presentation. The sound production for the artwork was created using the custom application that enabled the artist to place sound media in relation to a real-world map. An important component to this software was the ability to audition the audio experience without ever taking the journey.
  • Syren - A Ship Based Location-Aware Audio Experience
    (2005) Woo, Daniel; Mariette, Nicholas; Helyer, Nigel; Rizos, Chris
    Journal Article
    Syren, a location-based, multi-speaker augmented audio reality installation was presented as a shipboard exhibit at the 12th International Symposium on Electronic Art in August 2004. It was conceived as a continuous 3-day spatial audio experience that augments the landscape through the Baltic archipelago with location-based audio media, spatialised through a 12- channel speaker array. As the ship tracks between Helsinki, Mariehamn, Stockholm and Tallinn, listeners on the upper deck hear sounds that are perceived to originate from geographic features. Our custom GIS is derived from electronic nautical charting information that includes coastlines, buoys and beacons. A handheld GPS provides both position and direction data that was used by a software system to drive parameters of the spatial audio presentation. The sound production for the artwork was created using the custom application that enabled the artist to place sound media in relation to a real-world map. An important component to this software was the ability to audition the audio experience without ever taking the journey.