对流层延迟产品网站

igs产品：

https://cddis.nasa.gov/archive/gnss/products/troposphere/zpd/

ftp://cddis.gsfc.nasa.gov/gnss/products/troposphere/zpd/（Anonymous ftp service will be discontinued on October 31, 2020.）

ftp://gssc.esa.int/gnss/products/troposphere_zpd/

%以下内容取自igs官网

IGS associate analysis centers generate troposphere products from ground-based GNSS data. These products include five-minute estimates of zenith path delay (ZPD) and north and east troposphere gradient components. Data are available in daily files by site for over 350 GNSS stations in the IGS network. Measurements of surface pressure and temperature at GNSS sites allow the extraction of precipitable water vapor from the total zenith path delay. Final troposphere estimates for over 350 stations in the IGS network. The troposphere products utilize the IGS final satellite, orbit, and EOP products and are therefore available approximately three weeks following the observation day. Troposphere products are available in a standard, IGS format.

Since the inception of the troposphere product, three analysis groups (GFZ, JPL, and currently USNO) have generated the IGS combination solution each using different methodologies. Therefore, the resulting file types have changed through the years. The current product consists of files containing daily ZPD estimates for selected sites in the IGS network. The original product consisted of one file per site per GPS week.

%以下内容取自文献：Sung H. Byun, Yoaz E. Bar-Sever. A new type of troposphere zenith path delay product of the international GNSS service. 2009, 83(3-4):1-7.

– Software: GIPSY
– Fixed orbits and clocks: IGS Final Combined
– Earth orientation: IGS Final Combined
– Transmit antenna phase center map: IGS Convention
– Receiver antenna phase center map: IGS Convention
– Elevation angle cutoff: 7◦
– Mapping function (hydrostatic and wet): Niell (1996)
– A priori: Hydrostatic delay based on altitude (2.3 m at sea level), and 0.1 m for the wet delay
– Data time span: 24 h
– Data rate: 5 min
– Estimated parameters: clock (white noise), station position (constant), wet zenith delay (random walk with variance of 3 cm/h), atmospheric gradients (random walk with variance of 0.3 cm/h), phase biases (white noise)(Bar-Sever et al. 1998)
– Temporal resolution of zenith delay estimates: 5 min

%以下内容取自观测文件

头文件说明：

+TROP/DESCRIPTION
*_________KEYWORD_____________ __VALUE(S)_______________________________________
 ELEVATION CUTOFF ANGLE                             7
 SAMPLING INTERVAL                                300
 SAMPLING TROP                                    300
 TROP MAPPING FUNCTION         WET GMF 

各个分析中心tro产品

cod：

ftp://gssc.esa.int/gnss/products/2108/

ftp://cddis.gsfc.nasa.gov/gnss/products/troposphere/sub/

头文件说明：

%=TRO 0.01 COD 20:157:84478 IGS 20:153:00000 20:154:00000 P  MIX
*-------------------------------------------------------------------------------
+FILE/REFERENCE
*INFO_TYPE_________ INFO________________________________________________________
 DESCRIPTION        CODE, Astronomical Institute, University of Bern
 OUTPUT             CODE IGS 3-day solution
 CONTACT            code@aiub.unibe.ch
 SOFTWARE           Bernese GNSS Software Version 5.3
 HARDWARE           UBELIX: Linux, x86_64
 INPUT              CODE IGS 1-day solutions
-FILE/REFERENCE
*-------------------------------------------------------------------------------
+TROP/DESCRIPTION
*_________KEYWORD_____________ __VALUE(S)_______________________________________
 ELEVATION CUTOFF ANGLE                             3
 SAMPLING INTERVAL                                180
 SAMPLING TROP                                   7200
 TROP MAPPING FUNCTION         WET_VMF

cof：

ftp://gssc.esa.int/gnss/products/2108/

ftp://cddis.gsfc.nasa.gov/gnss/products/troposphere/sub/

头文件说明：

*-------------------------------------------------------------------------------

+FILE/REFERENCE

*INFO_TYPE_________ INFO________________________________________________________

 DESCRIPTION        CODE, Astronomical Institute, University of Bern

 OUTPUT             CODE IGS 1-day solution

 CONTACT            code@aiub.unibe.ch

 SOFTWARE           Bernese GNSS Software Version 5.3

 HARDWARE           UBELIX: Linux, x86_64

-FILE/REFERENCE

*-------------------------------------------------------------------------------

+TROP/DESCRIPTION

*_________KEYWORD_____________ __VALUE(S)_______________________________________

 ELEVATION CUTOFF ANGLE                             3

 SAMPLING INTERVAL                                180

 SAMPLING TROP                                   7200

 TROP MAPPING FUNCTION         WET_VMF

jpl：

ftp://gssc.esa.int/gnss/products/2108/

ftp://cddis.gsfc.nasa.gov/gnss/products/troposphere/sub/

头文件说明：

+FILE/REFERENCE

 DESCRIPTION          Jet Propulsion Laboratory

 OUTPUT               Daily trop estimates

 CONTACT              Christina Selle; 335-flinn@jpl.nasa.gov

-FILE/REFERENCE

+TROP/DESCRIPTION

*_________KEYWORD_____________ __VALUE(S)______________________

 SAMPLING INTERVAL                                 30

 TROP MAPPING FUNCTION                           GPT2

 ELEVATION CUTOFF ANGLE                      7.000000

 SAMPLING TROP                                     30

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