Multiple-scattering in radar systems: A review

被引:58
作者
Battaglia, Alessandro [1 ,2 ]
Tanelli, Simone [3 ]
Kobayashi, Satoru [4 ]
Zrnic, Dusan [5 ]
Hogan, Robin J. [6 ]
Simmer, Clemens [2 ]
机构
[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[2] Univ Bonn, Inst Meteorol, D-5300 Bonn, Germany
[3] Calif Technol, Jet Prop Lab, Pasadena, CA 91101 USA
[4] Appl Mat Inc, Santa Clara, CA 95054 USA
[5] Natl Severe Storms Lab NOAA, Norman, OK USA
[6] Univ Reading, Dept Meteorol, Reading, Berks, England
基金
美国国家航空航天局;
关键词
Radar equation; Multiple scattering; Radiative transfer; MIRROR-IMAGE RETURNS; BACKSCATTERING ENHANCEMENT; RADIATIVE-TRANSFER; PART II; DENSE DISTRIBUTION; 3-BODY SCATTERING; WEAK-LOCALIZATION; MILLIMETER-WAVE; GPM PERSPECTIVE; FAST LIDAR;
D O I
10.1016/j.jqsrt.2009.11.024
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Although extensively studied within the lidar community, the multiple scattering phenomenon has always been considered a rare curiosity by radar meteorologists. Up to few years ago its appearance has only been associated with two- or three-body-scattering features (e.g. hail flares and mirror images) involving highly reflective surfaces. Recent atmospheric research aimed at better understanding of the water cycle and the role played by clouds and precipitation in affecting the Earth's climate has driven the deployment of high frequency radars in space. Examples are the TRMM 13.5 GHz, the CloudSat 94 GHz, the upcoming EarthCARE 94 GHz, and the GPM dual 13-35 GHz radars. These systems are able to detect the vertical distribution of hydrometeors and thus provide crucial feedbacks for radiation and climate studies. The shift towards higher frequencies increases the sensitivity to hydrometeors, improves the spatial resolution and reduces the size and weight of the radar systems. On the other hand, higher frequency radars are affected by stronger extinction, especially in the presence of large precipitating particles (e.g. raindrops or hail particles), which may eventually drive the signal below the minimum detection threshold. In such circumstances the interpretation of the radar equation via the single scattering approximation may be problematic. Errors will be large when the radiation emitted from the radar after interacting more than once with the medium still contributes substantially to the received power. This is the case if the transport mean-free-path becomes comparable with the instrument footprint (determined by the antenna beam-width and the platform altitude). This situation resembles to what has already been experienced in lidar observations, but with a predominance of wide- versus small-angle scattering events. At millimeter wavelengths, hydrometeors diffuse radiation rather isotropically compared to the visible or near infrared region where scattering is predominantly in the forward direction. A complete understanding of radiation transport modeling and data analysis methods under wide-angle multiple scattering conditions is mandatory for a correct interpretation of echoes observed by space-borne millimeter radars. This paper reviews the status of research in this field. Different numerical techniques currently implemented to account for higher order scattering are reviewed and their weaknesses and strengths highlighted. Examples of simulated radar backscattering profiles are provided with particular emphasis given to situations in which the multiple scattering contributions become comparable or overwhelm the single scattering signal. We show evidences of multiple scattering effects from air-borne and from CloudSat observations, i.e. unique signatures which cannot be explained by single scattering theory. Ideas how to identify and tackle the multiple scattering effects are discussed. Finally perspectives and suggestions for future work are outlined. This work represents a reference-guide for studies focused at modeling the radiation transport and at interpreting data from high frequency space-borne radar systems that probe highly opaque scattering media such as thick ice clouds or precipitating clouds. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:917 / 947
页数:31
相关论文
共 109 条
[1]   ENHANCED BACKSCATTERING - THE UNIVERSAL WAVE PHENOMENON [J].
BARABANENKOV, YN ;
KRAVTSOV, YA ;
OZRIN, VD ;
SAICHEV, AI .
PROCEEDINGS OF THE IEEE, 1991, 79 (10) :1367-1370
[2]   Evaluation of radar multiple scattering effects in Cloudsat configuration [J].
Battaglia, A. ;
Ajewole, M. O. ;
Simmer, C. .
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2007, 7 (07) :1719-1730
[3]   Evaluation of radar multiple-scattering effects from a GPM perspective. Part II: Model results [J].
Battaglia, A. ;
Ajewole, M. O. ;
Simmer, C. .
JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY, 2006, 45 (12) :1648-1664
[4]   Multiple scattering effects due to hydrometeors on precipitation radar systems [J].
Battaglia, A ;
Ajewole, MO ;
Simmer, C .
GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (19) :1-5
[5]   Evaluation of radar multiple-scattering effects from a GPM perspective. Part I: Model description and validation [J].
Battaglia, A. ;
Ajewole, M. O. ;
Simmer, C. .
JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY, 2006, 45 (12) :1634-1647
[6]   Forward Monte Carlo computations of fully polarized microwave radiation in non-isotropic media [J].
Battaglia, A ;
Mantovani, S .
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 2005, 95 (03) :285-308
[7]   How does multiple scattering affect the spaceborne W-Band radar measurements at ranges close to and crossing the sea-surface range? [J].
Battaglia, Alessandro ;
Simmer, Clemens .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2008, 46 (06) :1644-1651
[8]   Multiple scattering effects in pulsed radar systems: An intercomparison study [J].
Battaglia, Alessandro ;
Kobayashi, Satoru ;
Tanelli, Simone ;
Simmer, Clemens ;
Im, Eastwood .
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY, 2008, 25 (09) :1556-1567
[9]  
Bissonnette L.R., 2005, LIDAR RANGE RESOLVED, P43, DOI [10.1007/0-387-25101-4_3, DOI 10.1007/0-387-25101-4_3]
[10]   LIDAR MULTIPLE-SCATTERING FROM CLOUDS [J].
BISSONNETTE, LR ;
BRUSCAGLIONI, P ;
ISMAELLI, A ;
ZACCANTI, G ;
COHEN, A ;
BENAYAHU, Y ;
KLEIMAN, M ;
EGERT, S ;
FLESIA, C ;
SCHWENDIMANN, P ;
STARKOV, AV ;
NOORMOHAMMADIAN, M ;
OPPEL, UG ;
WINKER, DM ;
ZEGE, EP ;
KATSEV, IL ;
POLONSKY, IN .
APPLIED PHYSICS B-LASERS AND OPTICS, 1995, 60 (04) :355-362