New model-based Bayesian inversion algorithm for the retrieval of wet troposphere path delay from radiometric measurements

被引:6
作者
Keihm, SJ [1 ]
Marsh, KA [1 ]
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
关键词
D O I
10.1029/97RS02748
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A new inversion algorithm has been developed for the retrieval of tropospheric wet path delay from microwave radiometer measurements. The algorithm is based on the principle of maximum probability and uses Bayes' theorem to determine the most probable state vector (comprised of discrete height profiles of temperature and water vapor density) for a given set of measurements. The solution probabilities depend both on conformity to apriori statistics and a minimization of residuals between measured observables and observables computed from candidate state vectors. The new algorithm has been compared with standard statistical inversion techniques using simulations based on radiosonde, lidar, and acoustic sounding measurements of atmospheric temperature and water vapor profiles. For clear conditions the results indicate that the nonlinear algorithm produces a factor of 3-5 improvement in path delay retrieval performance, relative to a nonstratified statistical algorithm, when the observational system includes both a water vapor radiometer and a microwave temperature profiler and measurement errors are minimized. The new algorithm is shown to be most useful when applied to radiometric measurements of path delay fluctuations over minute to multihour timescales. Recommended applications include tropospheric calibration systems for radio science experiments such as very long baseline interferometry astrometry and the planned Cassini gravitational wave experiment.
引用
收藏
页码:411 / 419
页数:9
相关论文
共 18 条
  • [1] STATISTICS OF ATOMIC FREQUENCY STANDARDS
    ALLAN, DW
    [J]. PROCEEDINGS OF THE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, 1966, 54 (02): : 221 - &
  • [2] BOUDOURIS G, 1963, J RES NBS D RAD SCI, V69, P631
  • [3] DECKER MT, 1978, J APPL METEOROL, V17, P1788, DOI 10.1175/1520-0450(1978)017<1788:EEOGBM>2.0.CO
  • [4] 2
  • [5] TROPOSPHERIC WET PATH-DELAY MEASUREMENTS
    ELGERED, GK
    [J]. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1982, 30 (03) : 502 - 505
  • [6] OPTIMUM STRATEGIES AND PERFORMANCE FOR THE REMOTE-SENSING OF PATH-DELAY USING GROUND-BASED MICROWAVE RADIOMETERS
    GARY, BL
    KEIHM, SJ
    JANSSEN, MA
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1985, 23 (04): : 479 - 484
  • [7] DUAL-CHANNEL MICROWAVE RADIOMETER FOR MEASUREMENT OF PRECIPITABLE WATER-VAPOR AND LIQUID
    GUIRAUD, FO
    HOWARD, J
    HOGG, DC
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1979, 17 (04): : 129 - 136
  • [8] OBSERVATIONS OF WATER-VAPOR BY GROUND-BASED MICROWAVE RADIOMETERS AND RAMAN LIDAR
    HAN, Y
    SNIDER, JB
    WESTWATER, ER
    MELFI, SH
    FERRARE, RA
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1994, 99 (D9) : 18695 - 18702
  • [9] TOPEX/POSEIDON MICROWAVE RADIOMETER (TMR) .3. WET TROPOSPHERE RANGE CORRECTION ALGORITHM AND PRE-LAUNCH ERROR BUDGET
    KEIHM, SJ
    JANSSEN, MA
    RUF, CS
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1995, 33 (01): : 147 - 161
  • [10] KEIHM SJ, 1996, 42127 JET PROP LAB, P1