Validation of line-of-sight water vapor measurements with GPS

被引:80
作者
Braun, J [1 ]
Rocken, C [1 ]
Ware, R [1 ]
机构
[1] UCAR, GPS Res Grp, Boulder, CO 80307 USA
关键词
D O I
10.1029/2000RS002353
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a direct comparison of nonisotropic, integrated water vapor measurements between a ground-based Global Positioning System (GPS) receiver and a water vapor radiometer (WVR). These line-of-sight water vapor observations are made in the straight line path between a ground station and a GPS satellite. GPS double-difference observations are processed, and the residual line-of-sight water vapor delays are extracted from the double-difference residuals. These water vapor delays contain the nonisotropic component of the integrated water vapor signal. The isotropic component is represented by the zenith precipitable water vapor measurement and can be scaled to a specific elevation angle based on a mapping function. The GPS observations are corrected for station-dependent errors using site-specific multipath maps. The resulting measurements are validated using a WVR which pointed in the direction of the observed satellites. The double-difference technique used to make these water vapor observations does not depend on accurate satellite clock estimates. Therefore it is especially well suited for near-real-time application in weather prediction and allows for sensing atmospheric structure that is below the noise level of current satellite and receiver clock errors. This paper describes the analysis technique and provides precision estimates for the GPS-measured nonisotropic water vapor as a function of elevation angle for use with data assimilation systems.
引用
收藏
页码:459 / 472
页数:14
相关论文
共 43 条
  • [31] 2
  • [32] THE MEASUREMENT OF ATMOSPHERIC WATER-VAPOR - RADIOMETER COMPARISON AND SPATIAL VARIATIONS
    ROCKEN, C
    JOHNSON, JM
    NEILAN, RE
    CEREZO, M
    JORDAN, JR
    FALLS, MJ
    NELSON, LD
    WARE, RH
    HAYES, M
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1991, 29 (01): : 3 - 8
  • [33] Estimation of tropospheric zenith delay and gradients over the Madrid area using GPS and WVR data
    Ruffini, G
    Kruse, LP
    Rius, A
    Bürki, B
    Cucurull, L
    Flores, A
    [J]. GEOPHYSICAL RESEARCH LETTERS, 1999, 26 (04) : 447 - 450
  • [34] SIERK B, 1998, PHYS CHEM EARTH, V32, P113
  • [35] Propagation delays induced in GPS signals by dry air, water vapor, hydrometeors, and other particulates
    Solheim, FS
    Vivekanandan, J
    Ware, RH
    Rocken, C
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D8) : 9663 - 9670
  • [36] STOKES GM, 1994, B AM METEOROL SOC, V75, P1201, DOI 10.1175/1520-0477(1994)075<1201:TARMPP>2.0.CO
  • [37] 2
  • [38] THE EFFECT OF THE DYNAMIC WET TROPOSPHERE ON RADIO INTERFEROMETRIC MEASUREMENTS
    TREUHAFT, RN
    LANYI, GE
    [J]. RADIO SCIENCE, 1987, 22 (02) : 251 - 265
  • [39] Sensing integrated water vapor along GPS ray paths
    Ware, R
    Alber, C
    Rocken, C
    Solheim, F
    [J]. GEOPHYSICAL RESEARCH LETTERS, 1997, 24 (04) : 417 - 420
  • [40] POINTED WATER-VAPOR RADIOMETER CORRECTIONS FOR ACCURATE GLOBAL POSITIONING SYSTEM SURVEYING
    WARE, R
    ROCKEN, C
    SOLHEIM, F
    VANHOVE, T
    ALBER, C
    JOHNSON, J
    [J]. GEOPHYSICAL RESEARCH LETTERS, 1993, 20 (23) : 2635 - 2638