Performance of Singapore Integrated Multiple Reference Station Network (SIMRSN) for RTK Positioning |
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Authors: | Guorong Hu Victor Khoo Pong Goh Choi Law |
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Institution: | (1) GPS Center, College of Engineering, Nanyang Technological University, Block S2-B4C-17, 50 Nanyang Avenue, Singapore 639798, |
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Abstract: | Conventional RTK positioning is usable, but requires the use of a local base station. It is also restricted by the effects
of the de-correlate atmospheric refraction on the GPS signal, which limits the use of the RTK positioning up to distances
of 10–15 km from the reference station to the user. With a multiple reference station network approach, precise RTK positioning
capability may be extended for a much larger area. The Singapore Integrated Multiple Reference Station Network (SIMRSN) has
been established for this purpose. Using an existing method termed linear combination method, the multiple reference station
network corrections are generated for the user on an epoch by epoch, satellite-by-satellite basis. A residual-based adaptive
Kalman filter is proposed to improve network correction availability. The VRS concept is used to transmit corrections to the
user for RTK positioning. Field tests were conducted to demonstrate the general performance of SIMRSN. The tests confirmed
that RTK positioning within a multiple reference station network can provide the user with better than 3 cm in horizontal
position, the height accuracy is in the range of 1–7 cm, and the average TTF (Time To Fix) are 46 and 76 s during GLC station
and LPR station tests, respectively. With this highly efficient survey technique, the user needs only to be equipped with
a single GPS receiver. This reduces equipment and manpower costs compared with traditional RTK positioning using a specially
set up reference station. The multiple reference station framework also paves the way for various other applications beyond
the traditional surveying profession.
Electronic Publication |
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