Empirical assessment of obstruction adaptive elevation masks to mitigate site-dependent effects
Empirical assessment of obstruction adaptive elevation masks to mitigate site-dependent effects
复制标题
DOI：
10.1007/s10291-017-0650-5
复制
发表时间：
2017-07
期刊：
影响因子：
4.9
通讯作者：
Florian Zimmermann;C. Eling;H. Kuhlmann
中科院分区：
文献类型：
--
作者：
Florian Zimmermann;C. Eling;H. Kuhlmann
场地相关效应是静态和动态全球导航卫星系统定位应用中的精度限制因素，因为它们不能用差分技术最小化。一般而言，这些影响可分为信号衍射、非视距(NLOS)信号接收、多径和卫星几何质量。尤其是信号的绕射和非视距接收会导致很大的定位误差。我们提出了一种直接的方法，通过形成基于地面激光扫描的障碍物自适应高程掩模来减少信号衍射和NLOS接收。这使得能够提高高精度静态全球导航卫星系统应用中的定位精度，即使在具有挑战性的全球导航卫星系统测量条件下也是如此。通过实证研究，成功地对该方法进行了检验，并对场地相关的系统误差进行了分离和分析。此外，还评估了场地相关效应及其误差源对定位解精度的影响。我们证明，尽管GNSS的测量条件很差，但定位精度可以达到2 mm以下，模糊定位率也得到了显著提高。
Site-dependent effects are accuracy-limiting factors in static and kinematic GNSS-based positioning applications since they cannot be minimized using differential techniques. In general, these effects are separated into signal diffraction, non-line-of-sight (NLOS) signal reception, multipath, and quality of the satellite geometry. In particular, signal diffraction and NLOS reception can lead to huge positioning errors. We present a straight forward approach to mitigate signal diffraction and NLOS reception by forming obstruction adaptive elevation masks, based on terrestrial laser scans. This enables an improvement of the positioning accuracy in high-precision static GNSS applications, even under challenging GNSS measurement conditions. By means of empirical investigations, the approach was tested successfully, and the site-dependent systematic errors can be separated and analyzed. Furthermore, the site-dependent effects and their error sources are assessed in relation to their impact on the accuracy of the positioning solution. We demonstrate that despite poor GNSS measurement conditions, positional accuracies better than 2 mm can be achieved and the ambiguity fixing rate is improved significantly.