Geodetski list, Vol. 69 (92) No. 4, 2015.
Pregledni rad
Locata – A New Technology for High Precision Outdoor and Indoor Positioning
Gorana Novaković
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Ante Marendić
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Igor Grgac
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Rinaldo Paar
orcid.org/0000-0002-7781-2301
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Robert Ilijaš
; Poljoopskrba d.o.o., Belica, Hrvatska
Sažetak
Although the Global Navigation Satellite Systems (GNSS) have been widely used in many areas of positioning and navigation, it is well known that this technology, in a specific environment, has its limitations or can not be applied. To overcome these limitations many researches were conducted to complement GNSS with other, mainly terrestrial technologies. One of the solutions is the application of pseudolites, ground-based generators and transmitters of GPS-like signals, for use in the local area. However, the technology based on pseudolites also has its limitations. The basic problem is that the pseudolites operate independently in so-called „unsynchronised mode“. In fact, the synchronization of transmitters that are broadcasting a positioning signal is the fundamental requirement for radio-positioning systems. In 2003, Locata Corporation (Canberra, Australia), began with the development of the concept of positioning for the purpose of establishing "a local autonomous terrestrial replica of GNSS". The result is Locata positioning technology, designed to overcome the limitations of GNSS and other positioning systems, by developing a time-synchronized transceivers called LocataLite. These transceivers form a network – LocataNet, which transmits signals that allow carrier-phase point positioning, with cm-level precision, for a mobile Locata receiver. The biggest technical achievement of Locata system is completely new, patented, wireless technology of time synchronization between LocataLites, called TimeLoc. Therefore, there is no need for base station, the connection for data transfer from the base to the mobile receiver, and no need to double differentiation measurements. Locata incorporates proprietary signal transmission structure that operates in the licence free Industry Stientific and Medical (ISM) band (2.4 GHz). This allows high power of transmitted signals so that Locata can be used for the indoor applications too. Locata is not a substitute for GNSS. It can be easily combined with GNSS, or can be used as an independent measuring system, where the GNSS is unavailable or unreliable. The article presents a brief overview of the development of Locata positioning technology, its basic components: LocataLite – transceiver and Locata – receiver, process of synchronization – TimeLoc, then the establishment of a network of LocataLites transceivers – LocataNet, the application of Locata technology in some areas of positioning and navigation, and at the end a brief description of the project “Project Wanderland” which includes the acquisition of the Locata equipment. It is an opportunity, for the first time in Croatia, to practically apply this new technology of positioning and navigation. The authors of this article will soon be able to present their own results and experience to the local professional community.
Ključne riječi
positioning; Locata technology; LocataLite; LocataNet; TimeLoc
Hrčak ID:
150719
URI
Datum izdavanja:
23.12.2015.
Posjeta: 2.167 *