GAMIT新版本10.71发布了

2020年3月，gamit 10.71版本发布了。相比2018年发布的10.7版本有哪些变化呢？官方给出的主要变化说明如下，需慢慢消化一下。

- The radiation pressure model is expanded from 9 to 13 parameters, adding twotwice-per-revolution (2/rev) and two 4/rev terms. GAMIT will carry all 13parameters, designated "ECOMC" (for Empirical CODE Models 1 and 2 combined) intables/sestbl. In generating fits to the IGS orbits, we recommend using ECOMC(the default). Note that if you estimate orbits in GAMIT ("RELAX." intables/sestbl.) you cannot mix in GLOBK the 10.71 processing with pre-10.71processing that uses the 9-parameter (BERNE or ECOM1) models. When combiningregional processing with MIT or SIO global h-files, you should always runGAMIT without orbit estimation ("BASELINE" in tables/sestbl.), as we have longrecommended. Even with the same version, different choices of orbit modelingparameters are likely to make the MIT combined binary-files incompatible withrecently processed. If BASELINE model is used in the GAMIT processing, theincompatibilities will be minor but in RELAX mode they can be severe (highchi^2 increments). Removing all "apr_svs", "mar_svs", "apr_rad" and "mar_rad"options in the GLOBK command file should minimize the effects ofincompatibilities.- Beidou processing now uses L6/C6 (B3 at 1268.53 MHz) rather than L7/C7 (B2b at1207.140 MHz) as the lower-frequency observable to accommodate the trackingconfiguration of most of the current GNSS receivers providing public data.Based on a sampling of 230 RINEX files from the archives, about 50% includeonly L6/C6 compared with about 5% that include only L7/C7. The higher-frequency observable will remain L2/C2 (B1-2 at 1561.098 MHz) since very fewof the public RINEX files contain L1/C1 from the B1 at 1575.42 MHz transmittedby BDS 3 satellites. If L7/C7 is the only observak present (i.e, no L6/C6),GAMIT will try to process the data along with L7/C7 receivers but there may beambiguity resoluion issues. User should data files and process only thosesites with the same frequency data.  There are still some issues with clockestimates for Beidou data and pre-fit edting in autlcn.- The default tables/sestbl. now has the 2nd-order ionosphere model turned on.The IGSG IONEX files will be used by default. If processing near-real time,the "-ion igrg" option should be used with sh_gamit. We also recommend alwaysincluding the "Inertial Reference System" option (current default "IAU0A")explicitly.- tables/svnav.dat is now linked to the IGS satellite metadata SINEX file(igs_metadata.snx). Release 10.70 and earlier versions of GAMIT cannot readthis file format and svnav.dat needs to be linked to svanv.dat.allgnss, whichwill be maintained for the foreseeable future. Several changes to files in thetables/ directory may be incompatible with early versions of GAMIT.- The tables/station.info file now accommodates another optional column("AntDAZ" in the header line) to specify the azimuth (clockwise from truenorth) of the antenna. Conventionally antennas are aligned with true north butsome (and likely many others that we don't know about yet) are recorded as setto another azimuth. The "AntDAZ" azimuth is read to rotate the phase centeroffsets (PCOs) and phase center variations (PCVs) from the ANTEX file(tables/antmod.dat) to correct for the azimuth of the antenna. sh_upd_stnfocan extract this information from IGS log files if the AntDAZ header isincluded (users should ensure that there are no non-numeric values in thecolumns below AntDAZ; white space in OK). The IGS will not implement thisfeature until ITRF2020 is released (that is, it will be part of repro3 but notthe operational processing).- We have changed many symbolic links in tables/ to be relative, rather thanabsolute, which assume that users install a local GRIDS/ directory at the samelevel as the source code (e.g. gamit/, libraries/, kf/, maps/, tables/, etc.),where grids downloaded from ftp://everest.mit.edu/pub/GRIDS/ should be stored.Creation of specific symbolic links, e.g. atml.grid, map.grid, met.grid, bythe user to the corresponding grid files is then no longer necessary.- sh_gamit now will remake g-files from SP3 files each time it is run to ensurethat the orbit models in tables/sestbl. are consistent with the sh_sp3fitmodels (these models are now read from sestbl. provided a copy can be found inthe standard processing directories). For sub-network processing, g-filesshould be made once before proceeding to process each sub-network (assumed tobe in parallel) using the "-remakeg N" option used with sh_gamit.- We remind users that when processing GLONASS data the ambiguity free (.glr) binary h-files should be used in GLOBK. Also remember that a multi-GNSS orbitfile should be used as well.- The format for the "apr_svs" and "mar_svs" radiation parameters specificationin the GLOBK command file has changed, with the unused "zrad" and "xrad"entries removed (see Pre 5.32 and Post 5.32 discussion in help/globk.hlp). Theoptions using the "<nn.nn>R" format remains unchanged. Older globk commandswith explicit radiation parameter constraints and process noise may need to beupdated.- GLOBK has moved to using "<GNSS><SVN>_<PRN>" syntax for satellite identifiersin output files (e.g. the .org-file), where <GNSS> is G, R, E or C, and SVNand PRN are Satellite Vehicle Number and Pseudo-Random Noise code,respectively. For GPS, the default is still PRN<PRN>_<SVN>. The new format forGPS can be invoked with the "use_prn n" command near the top of the commandfile. (See help/globk.hlp.)- New wild card features in file names now allow dates and times to be usedbased on the date and time of the h-file being processed. (See 5.32 featuresin help/globk.hlp.)- GLOBK can now do reference frame realization in back solutions. This willhappen automatically if GLORG is invoked in a GLOBK command file with the"bak_file" option included.- We will no longer provide GMT .grd-files in the maps/ directory to reduce thesize of the archive (.tar) files. Instead we now provide a new script,sh_dem, which will download and create a local copy of a chosen digitalelevation model (DEM) over a geographic region, both selected using the scriptoptions. The script is now called by sh_plotvel if the "-topo", "-topo_file"and/or "-illu_file" options are used; if the latter is given without anargument, sh_plotvel will create a .grd-file of the gradient for plottingshaded-relief (illumination) from the topographic .grd-file named or createdwith the "-topo_file" option. Both sh_dem and sh_plotvel require GMT to run.- GMT version 6.0.0 was released in November 2019. Scripts in com/ that use GMTto produce plots were updated for GAMIT/GLOBK 10.6 to accommodate majorchanges in the syntax of GMT version 5 commands (see relnote.10.6); the oldscripts, using GMT 4 syntax, are still available in com_preGMT5/ but are nolonger maintained. Although we have not done extensive testing yet, weunderstand that GMT 6 is fully backwards compatible with GMT 5 (e.g.https://docs.generic-mapping-tools.org/6.0/migrating.html) and should workseamlessly with our scripts currently in com/, which explicitly call "gmt"(now the sole GMT executable) throughout.- We have become aware that the GMT installation available via the softwarerepository for Ubuntu 16.04 LTS does not include the supplemental programs,most significantly psvelo for GAMIT/GLOBK. We recommend upgrading yourUbuntu operating system or building GMT from source. Seehttps://gmt.soest.hawaii.edu/projects/gmt/wiki/Installing#Linux and our "KnownIssues" web page at http://geoweb.mit.edu/gg/issues.php for more information.- We have also become aware that there seems to be an issue with theimplementation of gfortran version 7 on at least Ubuntu 18.04 LTS and openSUSELeap 15.1 operating systems, resulting in failed compilation with segmentationfault error messages, including "See <file:///usr/share/doc/gcc-7/README.Bugs>for instructions." We recommend upgrading to another version of gcc/gfortan,or downgrading to gcc/gfortran version 6. See our "Known Issues" web page athttp://geoweb.mit.edu/gg/issues.php for more information.--------------------------------------------------------------------------------Summary of specific changes for 10.71 (by directory):- com/links.arc, links.com, links.day: Updated to link otides.dat and to avoid linkingthe old ephemeris files (soltab., luntab.,nutabl.) if ~/gg/tables/nbody exists. Fixedtypos.sh_cleanup: Added missing closing curly bracket in test to remove n-files onlines 386 and 387. Floyd/Pickle 190507sh_gamit: Revert to using GPS-only RINEX 2 instead of MGEX RINEX 3 nav fileswhen processing GPS data since sh_rx2apr (svpos/svdiff) doesn't yetrecognize RINEX 3.Fix bug in naming files for -jclock sp3 option.Fixed a typo in call to sh_setup causing the lfile not to be updatedfrom the .apr-file.Correct version number - now 10.70 2019/8/14.sh_get_orbits: Placed $noclean variable in quotes in if-test at end to ensure astring match rather than interpretation as a test, which causesan error.sh_glred: Removed debug statement that forced archiving of the binary h-files.sh_hector: Minor edits to some awk commands.sh_makex: Initialize the sp3file variable to avoid a problem when running stand-alone.sh_otlcmc: New script to create tables/otlcmc.dat file from .cmc-files athttp://holt.oso.chalmers.se/loading/CMC/.sh_plot_elmean: Updated color scheme to work with GMT 5. Small changes to linewidths.sh_rx2apr: Updated grep commands to select only records that begin with a spacebefore the site ID, ignoring any "EXTENDED" records that may be inthe .apr file.sh_sp3fit: Fix bug in writing model names for the ARC input file.sh_tshist: Updated script to fully implement pos_res type. Original onlypartially updated from com_pre5GMT version.sh_upd_stnfo (and kf/htoglb/mstinf.[fh]): Added -debug option to help diagnoseproblems with bad year in IGS logfilesand fixed a bug associated with firstantenna starting after the firstreceiver entry.sh_update_dcb: Added explicit internal test for presence of tables/svnav.dat,needed for gamit/utils/dcbtab2.sh_update_eop: Updated to circumvent the shutdown of maia.usno.navy.mil andtoshi.nofs.navy.mil from 2019-10-24 to 2020-04-30.- gamit/orbits/kouba_gps.f, orbits/oversn.f; arc/ertorb.f, arc/earthradTUM.f,arc/aversn.f; lib/gpsblock.f, lib/lversn.f: Updated for Block IIIA SV.WARNING: Will recongize GPS BlockIIIA but use IIF values for Earthradiation pressure and yaw.arc/satprop.f, arc/earthradTUM.f: Updated for Block III SV. Temporarily use IIFEarth radiation model for Block IIIA for NCLE1(set for TUM1) and remove debug print fromearthradTUM.f.arc/sbfn: Fix bug in effect of General Relativity on satellite (~8 mm over 24hrs).includes/makex.h, lib/rrinex.f: Increase maximum line length to 1024, andassociated maximum observables allowed inrrinex.f and "MAXOBT" in makex.h to 63, toaccommodate long records in RINEX 3 files.lib/clkera: Erroneous extra read of "clkoff", apparently a problem with Intelcompiler but not gfortran.lib/linear.f, model/get_antinfo.f, model/get_antpcv.f, model/get_svantpcv.f:Fix problem with interpolation of elevation-only PCVs.lib/rrxhed.f: Skipped reading of SV-dependent wavelength factors in a RINEXheader since this feature is not yet supported.lib/sel_obtyp.f: Fix problem with omitted Beidou observable.Remove debug print statements.makex/get_navclk.f: Fix bug in not recognizing GNSS code "I" on the nav file.makex/getsp3.f: Added test for sp3d format.makex/rbatch.f: Add trap for "numsit" > "maxsit" in new-format case.Correct fix of trap for "numsit".makex/mversn.f, model/j_from_sp3.f, model/getnav.f: Allow reading sp3 "d" andfix getting the program namefor warning/fatal messages.makexp: Assign the sp3 file name when running manually.Revoked Zou/King 180912 update and reverted to version 9.86.Added correct handling of SP3 file name when running manually.model/call_mag.f, model/iondel.f, model/mag13.f, model/setup.f; fixdrv/bmake.f;tables/sestbl.: Added IGRF13 magnetic field model and changed default fromIGRF12 to IGRF13model/setup.f: Fix frequency check so that it works for L1-only.model/update_coords: Add missing "debug" in call to get_antinfo.utils/metutil: Change linear interpolation routine to be scalar rather thanvector.- help/displace.hlp: Updated documentation.- kf/blsum/tscon.f: Added assumption that UNR/NGL .txyz2 files without a referenceframe explicitly in the file name are the latest IGS14 version.displace: Updated Makefile, grid calculations and added tensile component tocalculations.gen_util/name_to_block.f: Changes BLOCK III to BLOCK IIIA so that correctsatellite number is assigned to the new PRN03.gen_util/real_stats.f: Updated dimensioning and bounds checking. Very long timeseries could cause segmentation violations.gen_util/sp3_lib.f, includes/sp3_def.h: Updated maximum number of nadir anglesvalues and added a dimensioning test.gen_util/sp3_lib.f: Fixed bug in report_stat call that is invoked in updatedsp3_def.h is not used. Increased max nadir values to 41 forGalileo chamber calibrations.globk/read_glb_mar.f: Critical update needed to make the SOURCE command work.glout/write_iers.f: Updated formats to allow more than 99 reference frame sites.htoglb/mstinf.[fh] (and com/sh_upd_stnfo): Added -debug option to help diagnoseproblems with bad year in IGSlogfiles and fixed a bug associatedwith first antenna starting after thefirst receiver entry.track, gen_util/sp3_lib.f: Updated for Beidou B7 phase and range measurements.utils/corcom: Updated output formats to allow for fast ice velocities.utils/glbtog.[fh]: Fixed bugs with writing G-files for non-GPS systems.libraries/comlib/proper_runst.f: Removed need for trailing "/" in HELP_DIR definition.- tables/luntab.2020.J2000, soltab.2020.J2000, nutabl.2020: Added luni-solar tables for2020 from JPL DE200.antmod.dat: Now linked to an IGS14 rather than IGS08 ANTEX file, which is nolonger updated by the IGS for new launches. As noted inrelnote.10.61, this will create a 2-3 mm discontinuity in height forall antennas and 5-10 mm discontinuities in horizontal and heightfor about 20 antennas.Updated regularly to the latest IGS14 ANTEX file (currentlyigs14_2091.atx, as of the date of this release). Linked from2019-10-10 (GPS week 2074) onwards to the IGS14 ANTEX filesupplemented with calibrations provided by the National GeodeticSurvey (NGS) (currently ngs14_2091.atx), plus some additionalentries copied from similar records to accommodate antennas withoutany official calibrations. tables/antmod.dat is linked totables/ngs14_2091_plus.atx, at the time of this release.Updated GLONASS SVs R801, R802, R855, R856, R858 and R859 to matchextended IGS designations (K1A, K1B and M+) intables/igs_metadata.snx.igs14_comb_na17.apr: Added new North America plate reference frame ("NA17")based on Kreemer et al. (2018).ftp_info: Updated vmf1 address and directory according to change reported byJohannes Boehm in IGS-ACS email #1176.Added HartRAO IGS regional data center and JAXA data center.globk.cmd: Added inclusion of apr_tran by default and option for apr_rot whenusing SINEX files.Corrected erroneous "COMB out_glb" output file name to ensure"------" string is parsed properly by prepending "H" to file name.leap.sec: Extended limit of table to 31 December 2020 with no additional leapseconds, following to IERS Bulletin C 59.hi.dat: Added TRM159800.00 antenna.igs_metadata.snx: Added from http://mgex.igs.org/ (currentlyigs_metadata_2091.snx, as of the date of this release) andaugmented with a bespoke block for the yaw of each satellite,currently read from tables/svnav.dat with some assumptions forsome satellites and systems.rcvant.dat: Fully updated to match IGS codes for all receivers and antennas,following ftp://igs.org/pub/station/general/rcvr_ant.tab. Records ofother known antennas, from the old rcvant.dat and those in the NGSANTEX file (see description of antmod.dat, above), are added. The14th character, indicating support for the receiver or antenna inGAMIT, is updated to identify the source of antenna calibration. Seeheader for more information.svnav.dat: Metadata for GLONASS (R), Galileo (E), Beidou (C), IRNSS (I) and QZSS(J) fully updated to match tables/igs_metadata.snx (fromhttp://mgex.igs.org/), which will ultimately supercedetables/svnav.dat; metadata for GPS assumed to be good (will beverified ultimately).otlcmc.dat: Replaced the provisional center-of-mass corrections for FES2012 withnew official ones from H. G. Scherneck. The differences are lessthan 0.05 mm.

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