PT  - JOURNAL ARTICLE
AU  - Kim, Bu-Gyeom
AU  - Kim, Donguk
AU  - Song,, Junesol
AU  - Kee, Changdon
TI  - Expanding Network RTK Coverage Using an Ionospheric-Free Combination and Kriging for Tropospheric Delay
AID  - 10.33012/navi.662
DP  - 2024 Sep 21
TA  - NAVIGATION: Journal of the Institute of Navigation
PG  - navi.662
VI  - 71
IP  - 3
4099  - https://navi.ion.org/content/71/3/navi.662.short
4100  - https://navi.ion.org/content/71/3/navi.662.full
SO  - NAVIGATION2024 Sep 21; 71
AB  - Network real-time kinematic (NRTK) coverage is defined as the area inside a station network. In conventional NRTK, the distance between stations is limited to 100 km, thus restricting the coverage of NRTK. In this study, we propose the utilization of an ionospheric-free combination and the application of a Kriging weighting model to mitigate tropospheric delay to extend the coverage of NRTK through network expansion. A network with station distances exceeding 100 km was constructed, and the residual errors, along with the success-fix rate of integer ambiguities, were analyzed on both sunny and rainy days to confirm the potential for network expansion using the proposed method. The results confirm that the success-fix rate increased by up to 44.3% on rainy days, compared with that of the traditional interpolation method. Furthermore, a high level of performance in integer ambiguity resolution can be maintained within the expanded network, regardless of the weather conditions.