GAMIT Reference Manual GPS Analysis at MIT(Release 10.3).pdf
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1、 1 1 June 2009 G A M I T G A M I T Reference ManualReference Manual GPS Analysis at MIT Release 10.3 T. A. Herring, R. W. King, S. C. McClusky Department of Earth, Atmospheric, and Planetary Sciences Massachussetts Institute of Technology 2 1 June 2009 Table of Contents 1. File Structure and Naming
2、Conventions.4 1.1 Introduction4 1.2 Site-occupation-specific files4 1.3 Experiment or session-specific files7 1.4 Global files.14 1.5 Summary of files17 2. Creating Data Input Files20 2.1 Introduction and file organization.20 2.2 Preparing the coordinate (L-) file21 2.3 Creating the station informat
3、ion file23 2.4 Creating a scenario file.26 2.5 Using makexp.27 2.6 Creating G- and T-files from external ephemerides.28 2.7 Creating satellite clock (J-) files31 2.8 Running makex.33 2.9 Description of the X-file.37 2.10 Creating station clock (K- and I-) files38 3. Batch Processing41 3.1 Introducti
4、on41 3.2 Running fixdrv42 3.3 Executing the batch run56 3.4 Evaluation the solutions64 4. Data Editing.79 4.1 Introduction79 4.2 Automatic editing using autcln.80 4.3 Scanning the residuals to identify slips .89 4.4 Interactive editing using cview93 4.5 Strategies for editing.103 5. Running the Modu
5、les Individually107 5.1 Introduction107 5.2 Running arc107 5.3 Running model.111 5.4 Running cfmrg114 5.5 Running solve.115 5.6 Running autcln.119 6. Automatic Batch Procesing 137 6.1 Overview137 6.2 Control files139 6.3 Using sh_gamit141 6.4 Using sh_glred144 7 Atmospheric Delay Models.148 7.1 Desc
6、ription of the atmospheric delay148 7.2 Algorithms for the propagation delay149 7.3 Estimating zenith delay paramaters.150 7.4 Estimating gradients.152 7.5 Extracting estimates of precipitable water.153 8. Utility Programs and Auxiliary Tables .154 3 1 June 2009 8.1 Plotting and computing statistics
7、 from GAMIT solutions154 8.2 Creating RINEX or FICA files from NGS ARGOS files.158 8.3 Creating RINEX files form FICA files159 8.4 Creating X-files from C-files160 8.5 Creating RINEX files from X-files.160 8.6 Creating and maintaining datum, time, spacecraft, and ephemeris tables.160 Appendices .166
8、 A.1. Antenna Specifications.166 A.1.1. Introduction.166 A.1.2. TI 4100 antennas .166 A.1.3 Trimble antennas167 A.1.4 Rogue antennas168 A.1.5 Ashtech antennas169 A.1.6 Macrometer antennas171 A.1.7 SERCEL antennas 171 A.1.8 Leica antennas171 A.2. Description of Data Exchange Formats.173 A.2.1 RINEX.1
9、73 A.2.2 FICA173 A.2.3 Navigation files 173 A.2.2 SP3 orbit file.176 A.3 Modeling Satellite Clock Variations due to SA178 References 181 4 1 June 2009 1. File Structure and Naming Conventions 1.1 Introduction All the program modules adhere to specific conventions for the naming of files for a partic
10、ular experiment. This assures a unique definition of each experiment, facilitates data file management, and allows for ease of interactive processing and troubleshooting. There are four types of files: 1) site-occupation-specific 2) session- or survey-specific 3) global Each file is distinguished ei
11、ther by its first character (types 1 and 2) or a unique name (type 3). Type 1 files are named using 4-character station codes and the day number of the observations. Type 2 files have a 4-character experiment (survey) or solution name, chosen by the analyst and usually the day number. Type 3 files h
12、ave specific names that are hard-wired in the software (though these names are often elaborated using links). These naming conventions allow the software to perform the bookkeeping necessary to process large quantities of data. The next three sections describe the contents and format of the files of
13、 each type, and how the file is created and used by the software. Section 1.5 has an alphabetical list of all files and a chart showing what files are read and written by each GAMIT module. 1.2 Site-occupation-specific files RINEX obs file : Observation data file containing the L1 and L2 carrier bea
14、t phases and pseudo-ranges, signal amplitudes, initial station coordinates and antenna offsets, start and stop times, and the identification of the satellites tracked in each receiver channel. Name : sitedayn.yyo Example : vndn0020.87o. Date from station VNDN (Vandenberg0 on day 2 of 1987. Type : AS
15、CII Created by : Programs written by manufacturers, AIUB, or UNAVCO (teqc) to read raw (binary) files downloaded from receivers. Input to : makex and optionally cview 5 1 June 2009 RINEX met file : Meteorological data collected at the station. Name : sitedayn.yym Example : vndn0020.87m. Data from st
16、ation VNDN (Vandenberg on day 2 of 1987. Type : ASCII Created by : Programs to read raw (binary) files downloaded from met sensors. Input to : model and sh_met_util X-file : GAMIT observation file, similar to the RINEX file except that the files for all stations used in a session start and stop at t
17、he same time (with empty epochs where observations were not obtained Name : xsitey.day Example : xvndn7.002. Data for VNDN from day 2 of 1987. Type : ASCII Created by : makex and optionally utility ctox Input to : makek and fixdrv; optionally bctot and cview C-file : Primary file for data analysis,
18、created by model from an X-file and used as input to autcln, cview, and solve; contains observations (Os), prefit residuals (O-Cs, observed-computed values), partial derivatives, and auxiliary information. Name : csitey.day Example : cvndn7.002 Notes : Direct correspondence to X-files but binary and
19、 with partials. If cycle slips needed to be repaired manually with cview, ctox may be used to convert the cleaned c-files to x-files for further process, though this is now rare. Type : Binary Output of : model, autcln, cview Input to : autcln, scandd, cview, solve K-file : Receiver clock data compu
20、ted by makex or makek using nominal site coordinates, broadcast ephemeris, and pseudo-range. It is used by fixdrv to estimate the coefficients of a linear or cubic polynomial model for clock behavior during the session. Name : ksitey.day Example : kvndn7.002 Notes : The parameters and format of the
21、station-specific K-file are described in Section 2.9. Type : ASCII Output of : makex, makek Input to : fixdrv and utilities calck and plotk . 6 1 June 2009 P-file : rint file for a model run - provides a record of the run. Name : psitey.day Example : pvndn7.002 Notes : Direct correspondence to X- an
22、d C-files Type : ASCII Output of : model Z-file : Print file written by model to provide to external programs a full record of the atmospheric values and models used in the processing. Name : zsitey.day Example : zvndn7.002 Notes : Written only if Output net file = Yes in the sestbl. Created by : mo
23、del Input to : sh_metutil 7 1 June 2009 1.3 Experiment or session-specific siles These files are specific to a particular session (day) or a group of days corresponding to a single survey (experiment). They always exist, either as files or links, within each day directory. Often a single version of
24、the file will be stored in the /tables directory for a survey and shared among all days via a link. Control files Processing control file: Used by sh_gamit; includes directory names and some processing control. See Chapter 10. Name : process.defaults Type : ASCII Created by : User from template Inpu
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