The modernized GLONASS (GLObal NAvigation Satellite System) provides new opportunities for estimating ZWD (zenith wet delay) and PWV (precipitable water vapor) for meteorology and climate related studies. In this study, ZWD/PWV retrieval from GLONASS and GPS (Global Positioning System) observations are assessed by comparing the results with radiosonde observations from nearly co-located GNSS (Global Navigation Satellite Systems) stations. The current consistency between GPS and GLONASS data for ZWD/PWV retrieving is investigated for the first time in the region after the access mode change of the GLONASS. The GPS and GLONASS observations for one month of each season for 8 regionally distributed stations from the CORS-TR (Continuously Operating Reference Stations - Turkey) network are processed. The results show that the GPS ZWD agrees well with the GLONASS ZWD, the RMS (root mean square) of ZWD differences is about 4.1–11.84 mm that is about 0.6–1.78 mm in PWV. ZWD differences are ranged from −20 mm to 20 mm on average for all stations. Correlation coefficients of ZWD differences for GNSS stations exceeds 84%, which means that the results obtained from GLONASS consistent with GPS. Also, PWV estimated from GLONASS observations have almost same RMS values at inland stations, while the combined solution having smallest for most of the stations.

现代化的 GLONASS（全球导航卫星系统）为气象学和气候相关研究估计 ZWD（天顶湿延迟）和 PWV（可降水水汽）提供了新的机会。在这项研究中，通过将结果与几乎位于同一地点的 GNSS（全球导航卫星系统）站的无线电探空仪观测结果进行比较，评估了从 GLONASS 和 GPS（全球定位系统）观测中获取的 ZWD/PWV。在GLONASS接入模式改变后，首次在该地区研究了当前GPS和GLONASS数据在ZWD/PWV反演中的一致性。处理来自 CORS-TR（连续运行参考站 - 土耳其）网络的 8 个区域分布站每个季节一个月的 GPS 和 GLONASS 观测。结果表明，GPS ZWD 与 GLONASS ZWD 非常吻合，ZWD 差异的 RMS（均方根）约为 4.1-11.84 mm，即 PWV 约为 0.6-1.78 mm。所有站点的 ZWD 差异平均在 -20 毫米到 20 毫米之间。GNSS台站ZWD差值相关系数超过84%，说明GLONASS得到的结果与GPS一致。此外，根据 GLONASS 观测估计的 PWV 在内陆站具有几乎相同的 RMS 值，而大多数站的组合解具有最小的值。这意味着从 GLONASS 获得的结果与 GPS 一致。此外，根据 GLONASS 观测估计的 PWV 在内陆站具有几乎相同的 RMS 值，而大多数站的组合解具有最小的值。这意味着从 GLONASS 获得的结果与 GPS 一致。此外，根据 GLONASS 观测估计的 PWV 在内陆站具有几乎相同的 RMS 值，而大多数站的组合解具有最小的值。