Developing Regional Precise Positioning Services Using the Legacy and Future GNSS Receivers

Abstract

This paper presents an overview of technical solutions for regional area precise GNSS positioning services such as in Queensland. The research focuses on the technical and business issues that currently constrain GPS-based local area Real Time Kinematic (RTK) precise positioning services so as to operate in future across larger regional areas, and therefore support services in agriculture, mining, utilities, surveying, construction, and others. The paper first outlines an overall technical framework that has been proposed to transition the current RTK services to future larger scale coverage. The framework enables mixed use of different reference GNSS receiver types, dual-or triple-frequency, single or multiple systems, to provide RTK correction services to users equipped with any type of GNSS receivers. Next, data processing algorithms appropriate for triple-frequency GNSS signals are reviewed and some key performance benefits of using triple carrier signals for reliable RTK positioning over long distances are demonstrated. A server-based RTK software platform is being developed to allow for user positioning computations at server nodes instead of on the user's device. An optimal deployment scheme for reference stations across a larger-scale network has been suggested, given restrictions such as inter-station distances, candidates for reference locations, and operational modes. For instance, inter-station distances between triple-frequency receivers can be extended to 150km, which doubles the distance between dualfrequency receivers in the existing RTK network designs.

An Implementation of Location Based Service (LBS) for Community Tracking

“…Moreover, Williams (2008) also developed an application that could track the coordinates of the user. Feng (2009) had research in the searching application on a regional basis. Similarly, Yulianto (2010) had an application that showed the route from the user's position to the destination.…”

Aplikasi Pencarian Tempat Wisata Berbasiskan GPS dengan Metode Radius dan Rating

“…Penelitian sebelumnya telah menghasilkan aplikasi yang hanya dapat menampilkan peta wisata pada perangkat mobile (Lai, Li, Chan, et al, 2007), titik koordinat pengguna (Simon & Williams, 2008), pencarian tempat secara regional (Feng, Rizos, Higgins, et al, 2009), rute dari posisi wisatawan ke lokasi tersebut (Yulianto, 2010), dengan penambahan grafis peta (Chu, Lin, Chang, et al, 2011), dan grafis lokasi 2 dimensi (Ruotsalainen, Kuusniemi, & Chen, 2011). Penelitian terbaru telah menambahkan informasi angkutan umum yang dapat digunakan untuk menuju tempat wisata (Edwards & Griffin, 2013) dan informasi angkutan umum yang sedang melintas menuju wisatawan (Shimizu, Yamaguchi, Ai, et al, 2014).…”

Estimation and Mitigation of the Main Errors for Centimetre-level Compass RTK Solutions over Medium-Long Baselines

“…Research for high accuracy, triple-frequency Compass RTK positioning over medium-long baselines mainly includes the following three categories: 1) Real-time cycle slip detection and recovery for triple-frequency observations; 2) Fast ambiguity resolution for medium-long baselines; and 3) High accuracy RTK positioning for medium-long baselines. At present, researchers all over the world have conducted much work for the first two categories, however, little literature for 3) can be found (Fan and Wang, 2007; Feng, 2008; Feng and Li, 2008a,2008b; Feng and Rizos, 2009; Feng et al, 2007; Guo et al, 2010; Han and Rizos, 1999; Hatch, 2006; He et al, 2010; Li 2010; Li et al, 2011; Teunissen et al, 2002). In this paper, the main error sources for high accuracy RTK positioning over medium-long baselines will be analysed first, then in-depth studies over the methods for the estimation and mitigation of the main errors are carried out.…”