UNIVERSITY OF NEW SOUTH WALES, SYDNEY, AUSTRALIA
Network-RTK Testing & SydNET
Author: Nicolas James Tucker
Supervisor: Dr. Craig Roberts
Operating Reference Stations (CORS) networks have experienced a significant
growth in numbers over the previous decade.
This has been due primarily to their many applications and ability to
overcome issues in real-time positioning. Sydnet
is one such CORS network that operates throughout the Sydney basin (Refer to
Figure 2-1). The development of CORS
networks has also enabled the implementation and further advance in Network-RTK
Figure 2-1: SydNET station locations over the Sydney Basin & regional areas (Yan, 2004).
is able to provide its users with consistent centimetre level horizontal
accuracies (Roberts et al, 2007). The
services it provides to users include (Rizos et al 2004):
corrections are published on the internet, while the real-time data can be
accessed via a mobile phone connection in the field.
An integral part of this project is the area in
which the observations will take place. A
constraint, however, is that the
research software is only compatible with
Ashtech receivers (At the time of writing).
The three stations selected from Sydnet include Villawood, Mulgrave and
Springwood (VLWD, MGRV & SPWD
on Figure 2-1), which all use Ashtech receivers (at time of writing June 2008).
Within this area of operations, the triangle formed by the three
stations, high order marks, class C and above in the horizontal, have been
searched for on SCIMS in 5km spacings from the Villawood station in an
approximate bisecting line (Refer
to Figure 2-2 below).
Area of Operations and 5km Markings
The marks will be observed at the same time with
both softwares. This will be
achieved through the use of a splitter, where one antenna is connected to two
Leica 1200 units (Refer to Figure 2.2 below).
In doing so, a seamless comparison of the two softwares can occur, as
both use a VRS solution.
The SNAPper Field Testing Splitter concept that will be used (Yong, 2008).