Abstract
Development of large scale engineering projects has created a need for a positioning system able to deliver high accuracy results with relatively low maintenance, compared with classical methods. Carrier phase GNSS is usually the system of choice but, unfortunately, its accuracy is based on the visibility and the geometric distribution of the satellites, causing it not only to vary throughout the day but also to be prone to location specific problems.
One possible solution is deployment of a supporting system, mitigating the need for a clear view of the sky. Locatalites, a terrestrial positioning technology, operating in the 2.4 GHz ISM frequency band and by utilising a novel TimeLoc procedure synchronising the network to the nanosecond level, could be considered as such system. Similar characteristics to GNSS make Locata prone to a weak vertical component but also make it a natural supplementary system.
This paper describes the work conducted towards the deployment of both technologies as a loosely integrated system. The additional advantages are improved cycle slip detection for both systems and vastly increased geometry accuracy. This approach also enhances quality assessment.
The paper outlines the software approach taken and research of the feasibility of such a solution. It briefly explains coupled systems optimal use in different environments and enhanced ability of mitigating GNSS/Locata outage and destructive effects of multipath and noise.
The research goal is to maintain centimetre accuracy, instead of no solution or metre to decimetre accuracy currently experienced, in the areas “difficult” for GNSS – such as urban canyons and semi-indoors areas. The main utilization of this research is expected to be civil engineering and monitoring
One possible solution is deployment of a supporting system, mitigating the need for a clear view of the sky. Locatalites, a terrestrial positioning technology, operating in the 2.4 GHz ISM frequency band and by utilising a novel TimeLoc procedure synchronising the network to the nanosecond level, could be considered as such system. Similar characteristics to GNSS make Locata prone to a weak vertical component but also make it a natural supplementary system.
This paper describes the work conducted towards the deployment of both technologies as a loosely integrated system. The additional advantages are improved cycle slip detection for both systems and vastly increased geometry accuracy. This approach also enhances quality assessment.
The paper outlines the software approach taken and research of the feasibility of such a solution. It briefly explains coupled systems optimal use in different environments and enhanced ability of mitigating GNSS/Locata outage and destructive effects of multipath and noise.
The research goal is to maintain centimetre accuracy, instead of no solution or metre to decimetre accuracy currently experienced, in the areas “difficult” for GNSS – such as urban canyons and semi-indoors areas. The main utilization of this research is expected to be civil engineering and monitoring
| Original language | English |
|---|---|
| Title of host publication | FIG Congress 2010 |
| Subtitle of host publication | Facing the Challenges – Building the Capacity |
| Place of Publication | Sydney |
| Publisher | International Federation of Surveyors, FIG |
| Number of pages | 14 |
| Publication status | Published - 2010 |
Keywords
- Locatalites
- Pseudolites
- GNSS
- High precision positioning
- Error detection
- Integration
