1. Higher-order gravitational potential gradients by tensor analysis in spherical coordinates

   • Xiao-Le Deng
   • Jiangjun Ran

   Original Article 12 July 2021 Article: 88

2. IAG Newsletter

   • Gyula Tóth

   IAG Newsletter 09 July 2021 Article: 87

   

3. Analytical equations for an infinite series involving low-order associated Legendre functions in geoscience

   • He Tang
   • Wenke Sun

   Original Article 02 July 2021 Article: 86

   

4. Galileo precise orbit determination with optical two-way links (OTWL): a continuous wave laser ranging and time transfer concept

   • Stefan Marz
   • Anja Schlicht
   • Urs Hugentobler

   Original Article Open access 02 July 2021 Article: 85

   

5. Estimation of subcanopy topography based on single-baseline TanDEM-X InSAR data

   • Huiqiang Wang
   • Haiqiang Fu
   • Yanan Yu

   Original Article 01 July 2021 Article: 84

   

6. An analysis of multisource tropospheric hydrostatic delays and their implications for GPS/GLONASS PPP-based zenith tropospheric delay and height estimations

   • Hongxing Zhang
   • Yunbin Yuan
   • Wei Li

   Original Article 30 June 2021 Article: 83

   

7. Calibrating receiver-type-dependent wide-lane uncalibrated phase delay biases for PPP integer ambiguity resolution

   • Bobin Cui
   • Pan Li
   • Harald Schuh

   Original Article Open access 29 June 2021 Article: 82

   

8. The CODE ambiguity-fixed clock and phase bias analysis products: generation, properties, and performance

   • S. Schaer
   • A. Villiger
   • A. Jäggi

   Original Article Open access 28 June 2021 Article: 81

   

9. The mean seasonal cycle in relative sea level from satellite altimetry and gravimetry

   • Richard D. Ray
   • Bryant D. Loomis
   • Victor Zlotnicki

   Original Article Open access 27 June 2021 Article: 80

   

10. Resilient observation models for seafloor geodetic positioning

    • Yuanxi Yang
    • Xianping Qin

    Original Article 26 June 2021 Article: 79

    

11. The effect of function-based and voxel-based tropospheric tomography techniques on the GNSS positioning accuracy

    • Saeid Haji-Aghajany
    • Yazdan Amerian
    • Harald Schuh

    Original Article 24 June 2021 Article: 78

    

12. Three-dimensional reconstruction of seismo-traveling ionospheric disturbances after March 11, 2011, Japan Tohoku earthquake

    • Changzhi Zhai
    • Yibin Yao
    • Jian Kong

    Original Article 23 June 2021 Article: 77

    

13. GPS satellite differential code bias estimation with current eleven low earth orbit satellites

    • Xingxing Li
    • Wei Zhang
    • Yongqiang Yuan

    Original Article 22 June 2021 Article: 76

    

14. Optimal VLBI baseline geometry for UT1-UTC Intensive observations

    • Matthias Schartner
    • Lisa Kern
    • Benedikt Soja

    Original Article Open access 19 June 2021 Article: 75

    

15. Ten years of Lake Taupō surface height estimates using the GNSS interferometric reflectometry

    • Lucas D. Holden
    • Kristine M. Larson

    Original Article 18 June 2021 Article: 74