收稿日期: 1999-12-07
修回日期: 2000-03-06
网络出版日期: 2000-10-01
基金资助
国家自然科学基金重点项目“空间天文技术监测和综合研究大气与海洋变化”(编号:19833030)和中国科学院“九五”重大项目“地球各圈层相互作用的现代天文学研究”(编号:KJ951-1-304)联合资助。
INVERSION OF TERRESTRIAL ATMOSPHERIC PARAMETERS USING SPACEBORNE GPS RADIO OCCULTATION AND ITS APPLICATION
Received date: 1999-12-07
Revised date: 2000-03-06
Online published: 2000-10-01
蒋 虎,黄 王成,严豪健 . 空间GPS无线电掩星反演大气参数方法及其应用[J]. 地球科学进展, 2000 , 15(5) : 565 -570 . DOI: 10.11867/j.issn.1001-8166.2000.05.0565
The principle and error assessments of the application of spaceborne GPS radio occultation to terrestrial atmosphere inversion are reviewed and the recent developments on this discipline are summarized. Based on the established theory and data from GPS/MET mission, researchers from University Corporation for Atmosphere Research in US have presented their results that the accuracy of GPS occultation inversion for atmospheric temperature is averagely one Kelvin between 5 km and 40 km altitude. If temperature is obtainable from an independent source, water vapour pressure profiles can be derived, which is quite interesting to meteorologists; however it is still tentative to derive water vapor profile because before reliable results for water vapor profiles are attainable, the multipath effect on signal, which is difficult to model, should be mostly removed. Currently, inversion accuracies suffer much from signal to noise ratio limiting, so inflight GPS receivers for obtaining lower signal to noise ratio GPS signal are required in order to get more effective data for inverting atmospheric parameters. As far as the characteristics of the technique in question are concerned, we raise some problems which remain to be settled. They include: how to narrow and interpret the differences of temperature derived by GPS occultation method and routine technique, such as Radiosonde; how to get atmospheric parameters in the lower atmosphere, say, under 5 km altitude, and in the upper atmosphere, say, above 40 km; how to decorrelate temperature and water vapour pressure so as to get reliable water vapour pressure profiles; how to take into account the ignored “higher-order”term, which can be expressed as the integral of the dot-product between gradient of refractivity and velocity of GPS signal with respect to the geocenter, integrating along the signal propagation path; how to overcome the singularity of integrand at the lower integration limiting when the Abel transform is adopted to produce the refractivity profiles.
[1] Rius A, Ruffini G, Cucurull L. Improving the vertical resolution of ionospheric tomography with GPS occultations[J].Geophys Res Lett, 1997,24: 2 291～2 294.
[2] Rocken C, Anthes R, Exner M,et al. Analysis and validation of GPS/MET data in the neutral atmosphere[J]. Jour Geophys Res, 1997, 102: 29 849～29 866.
[3] Melbourne W, Davis E, Duncan C,et al. The application of space borne GPS to atmospheric limb sounding and global change monitoring [J]. JPL Publ, 1994,18:147.
[4] Bassiri S, Hajj G A. Higher-order ionospheric effects on the GPS observables and means of modeling them[J]. Manuscripta Geodetica, 1993, 18: 280～289.
[5] Ware R, Exner M, Feng D,et al. GPS sounding of the atmosphere from low Earth orbit: Preliminary results[J]. Bull Amer Met Soc, 1996,77: 19～40.
[6] Haines B J, Bar-Sever Y E. Monitoring the TOPEX microw ave radiometer with GPS: stability of columnar water vapor measurements [J]. Geophys Res Lett, 1998, 25: 3 563～3 566.
[7] Leroy S. The measurement of geopotential heights by GPS radio occultation[J]. Geophys Res, 1997,102: 6 971～6 986.
[8] Hajj G A, Romans L J. Ionospheric electron density profiles obtained with the GPS: results from the GPS/MET experiment [J]. Radio Science, 1998, 33(1): 175～190.
[9] Lemoine F G, Pavis N K, Kenyon S C,et al. New high-resolution model developed for Earth' s gravitational field, EOS[J]. Trans Amer Geophys Union, 1998, 79: 113～118.
[10] Kuo Y H, Zou X, Huang W. The impact of GPS data on the prediction of an extratropical cyclone: An observing system simulation experiment [J]. J Dyn Atmos Ocean, 1997,27:439～470.
[11] Yan Haojian, Huang Dong, Huang Cheng. Sequential atmospheric profiles near a fixed location derived from GPS-LEO occultation measurements [J]. Geophys Res Lett, 1999, 26:451～454.
[12] 胡国荣.星载GPS低轨卫星定轨理论研究(博士论文摘要)[J].测绘学报,1999,3:281.
[13] Bertiger W I, Bar-Sever Y E, Christensen E J,et al. GPS precise tracking of topex/poseidon: results and implications[J]. J Geophys Res, 1994, 99: 24 449～24 464.
[14] 沐定夷,胡鸿钊著.数值分析[M].上海:上海交通大学出版社,1994.220.
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