1、GAMIT软件Track模块使用帮助TrackRT : Realtime GPS kinematic processing programTrackRTB : Realtime GPS kinematic processing program for use with Pre2.5 BNCTrackRTr : Rinex file emulator of trackRT for post-processing evaluationRunstring:% trackRT % trackRTB where options are -m Host name of system with real-t
2、ime data port (Normally BNC would be running on this system) (Default local host) -p Port number on host supplying the data stream (Mandatory input). -f trackRT command file (similar to track command file) -r 4-char code for reference site. -d list of sites to be processed. If not specified all site
3、s in data stream will be processed (there is a limit on maximum number of sites that can be processed depending on max_site in track. The reference code should NOT be given here.) -n Specifies a root name to which output will be directed (.out is appended for stdout output). Use ? in the pos_root, s
4、um_file and csv_file names the ? will be replaced by this string.Command file name must be given.% trackRTr Same list of option although -m, -p have no effect -d list of rinex files (site names are generated from the first 4-characters of rinex file names)VERSIONS:- 1.13 - Fixed time-equate iin Save
5、ObsA so that a differnce of more than 0.1 seconds in needed for a new epoch (trackRT only) Added reference relative humidity for GPT. (120103)1.12 - Handle bad PRN from BNC where G23 = 203.1.11 - Version to handle missing satellites in SP3 files (110505)1.10 - Version to handler BNC 2.5 and greater
6、that is now outputing ascii rather than binary data (trackRTB handles BNC2.0) (110501)1.00 - Initial version 100301 (2010 March 1)INTRODUCTION:-TrackRT/TrackRTB and trackRTr have many commands that allow it be controlled both when started and during runs. Below the detailed commands are given and he
7、re we give the minimum commands needed.SP3_DIR : (unless sp3 files are in the current directory)SITE_POS: Site positions must be given for every site to be processed. SITE_STATS: To set the apriori sigma and process noise for the sites. NOTE: The reference site position should be set to zero for the
8、 apriori sigma and process noise. Typical site_stats would be where cit1 here is the reference site. site_stats all 0.1 0.1 0.1 0.025 0.025 0.025 cit1 0.0 0.0 0.0 0.0 0.0 0.0ATM_STATS: By default atmospheric delays are not estimated, and normally these should be. Normally the reference site is set t
9、o zero when site separations are less the 500-1000km. Typical atm_stats command would be atm_stats all 0.20 0.00010 0.000 ! Unit m/sqrt(sec) - 0.0001 = 0.03 m/sqrt(day) cit1 0.00 0.00000 0.000If mixed antenna and receiver types are used ANTE_OFF: To specify the antenna heights and types and receiver
10、 typesANTMOD_FILE: Must be given to get the antenna phase center modelsRCV_TYPE: Needed for mixed receiver types (entry can be specified in ANTE_OFF also and this command would not be needed).DCB_FILE: Up to date, data code bias (DCB) file (part of GAMIT ftp area).IncludingUPDATE_FILE is useful so t
11、hat trackRT can be controlled on the fly.TrackRTB should be used for older versions of BNC. If no files are createdby trackRT or trackRTB (list of files should be listed shortly after the program is started) then try using the other version. The program are identicalexcept trackRTB is expecting a bi
12、nary data stream. COMMANDS-Input/Output commands- SP3_DIR - Directory where sp3 files are stored - Center for orbits (default igs, igr and igu also tested) POS_ROOT Set the root part of the name for the output files. Root part of name. When ? included in the , the ? is replaced with the -n string. D
13、uration of data in each file. The designations of d, h, or m may be used to specify the units of days, hours, minutes. Default is d.The position file names take the form: (see commands below).The resolution of the which is modulo the output intervaldepends on the output duration. For output duration
14、s greater than orequal to 1-day, the time is given as YYYYMMDD. For intervals shorterthan 1-day, it is YYYYMMDD:HHMN. Minium output interval is 1 minute. SUM_FILE Sets the root part of the summary file name. Using ? in the namewith be replaced by the -n string. (Default if command is not givenis tra
15、ckRT or the -n string when -n used). File names are time taggedaccording to the pos_root output interval. CSV_ROOT Set the root part of the name for comma separated values (CSV) outputfile. These files are used for AmCharts web plots. DCB_FILE Set the name of the data-code-bias (DCB) file. This file
16、 is part of the GAMIT tables directory and should be updated regularly. It is used toremove biases in the Melbourne-Wubbena widelanes. The receiver type canbe specified with the RCV_TYPE or ANTE_OFF commands. ANTMOD_FILE Sets the name of a standard IGS antex file with phase center models forthe GPS
17、ground antennas. Antenna types at specific sites are given withthe ANTE_OFF command. This command my be used multiple times for sitespecific model with new models replacing previously read ones. UPDATE_FILE Allows new trackRT commands to be issued during a run. Once the file is read it needs to be d
18、eleted before the trackRT will re-read it. File is only read if it exists. NOTE: File should be removed before trackRT isrun or else it will be read when the command file is read (ie., it willoverwrite the commands in the command file. OUT_TYPE Specifies types of output coordinates. All types can sp
19、ecified in a single string with no spaces. The types areNEU - North, East, Up differences from the reference site or from the coordinates given in the REF_NEU command. GEOD - Geodetic latitude, longitude and height (in the GEOD format, the total atmosheric delay is given, while in the other formats
20、the adjustment to the apriori delay is given).XYZ - Cartersian XYZ coordinatesDHU - Delta horizontal and Up coordinates from the apriori coordinates of each site (default output type) OUT_SIG_LIMIT Sets the maximum sigma of a position estimate for it to be output.If pseudorange data types are used,
21、the default value of 1 m needsto increased to 10-100 meters. Analysis commands- DATA_NOISE PRNAllows specificiation of the noise in the L1 phase, L2 phase,P1 range and P2 range, and the weight given to elevation angledepepence (at ver 1.20); variance is scale by (1+(W/sin(el)2) where W is the . Thes
22、e values affect the sigmas printed forthe position determinations Optional: PRN may be added and noise assigned to that PRN (ifnon-PRN form is used, this will replace all PRN specific valuesso use the non-PRN first followed by specific PRN values DATA_TYPE Specifies type of data to process. Types su
23、pported are L1 L2 LC P1 P1 PCwhich can be combined in a contiguous string. Files names include thisstring at the end.Vers 1.0: Only LC, LCPC and PC have been tested. Specifically L1 only datahave not been fully implemented yet. USE_GPTGMF Set the used of the GPT temperature pressure model and the GP
24、T dry and wetmapping functions. Optional relative humity added vers 1.27; default 0.00.Default is the older MTT atmospheric model.Site and Antenna informationSite information is entered by first giving the command and then theinformation by site on the subsequent lines SITE_POS Site Site is the four
25、 character name of the site (more characters can be included but only the first 4 are checked). Site names that do not appeat in the listof sites to be processed are ignored). The remainder of the line contains positon and velocity and the epoch in deciminal years to which the position refers. ANTE_
26、OFF Site Specifies the type of antenna and its position of antena reference point (ARP) at each site. The antenna name including radome should be specified with theofficial IGS name for a standard ANTEX file or with a unique name that appearsin the ANTEX file for site specific calibrations. (Note: T
27、here is oneadditional character in the station.info long antenna and this extra characterbefore the radome name must be removed. The antenna name and radome can be copied directly from the rinex file if present. One more ANTEX files must bespecified with the ANTMOD_FILE command for the antenna names
28、 to be useful. The receiver type DCB code can be optionally specified here as well (See RCV_TYPE command). RCV_TYPE Site Specifies the type of data-code-bias (DCB) correction needed for the receiver. Code specifies the type of L1 and L2 ranges being measures. The choices areP - Pcode, C - C/A and N
29、C/A with cross corelation for L2 range. The codescan be found in gamit/tables/rcvant.dat. These codes can also be given in theante_off command. An up-to-date DCB_FILE command must be used to specify theDCB biases. The files are available from the MIT ftp site and update once permonth. SITE_STATS Sit
30、e Gives statistics to assign to the kinematic station positions. The are the three sigmas in XYZ for the initial postion and are the three sigmas for the random walk in position. Unitsof the ransom walk are m/ssqrt(s).ALL can be used for the station name and the same statistics will be appliedto all
31、 kinematic sites (NOTE: the fixed site do not change position).e.g. site_stats all 1.0 1.0 1.0 0.010 0.010 0.010 base 0.0 0.0 0.0 0.000 0.000 0.000(1 meters apriori sigmas and changes 10 mm/sqrt(s)=600 mm/sqrt(hr).NOTE: One station should always set to zero sigmas and random walk otherwise allstatio
32、n positions will be estimated and noramlly drift by large amounts.The fixed station does NOT need to be the reference site. ATM_STATS Site Gives the statistics for the atmospheric delays by site. A random walk processs moise increases as sqrt(time) where time is time in seconds. The valuesare the in
33、itial sigma in meters, RW changes in meters per sqrt(second) and (addedverion 1.2) a dH/dt variance term so that during rapid height changes more process noise can be added to zenith delay estimate. The process noise variance is(2 per sqrt(sec) where dh/dt is m/s. The default valeis 0.00023 m2/sqrt(
34、s). (Term only needed for aircraft processing). e.g., atm_stats all 0.10 0.0001 0.00000 t39a 0.10 0.0001 0.00023 base 0.00 0.0000 0.00000Sets the apriori sigma as 10cm and allows the delay to change 6 mm/sqrt(hr) and 2.3 mm/sqrt(s) when height is changing at 10 m/s (fast ascent or desent) for thesit
35、e t39a (aircraft). In the case, here base is a reference station at whichthe atmospheric delay is not estimated (other stations absorbe the atmosphericdelays at the base station). With kinematic positioning over few hundred km siteseparations, the atmospheric delay at one site is normally fixed.Ambi
36、guity resolution/data control commands.-trackRT uses a combination of the Melbourne-Wubbena widelane (MW-WL), the extrawidelane (EX-WL) and the floating point estimates of the ionospheric free ambiguity (LC)to resolve integer ambiguities. If we denote the number of integer cycle ambiguitiesat L1 and
37、 L2 by N1 and N2, The MW-WL is an estimate of N1-N2 based on phase and rangedata; EX-WL = N1 - f1/f2 N2 and is an integer for L1 cycles, but 1.283 N2 for L2 cycles;LC = 2.546 N1 - 1.984 N2. The EX-WL is unaffected by geometric ranges changes, but does depend on the ionospheric delay. For short basel
38、ines, the EX-WL should be near zero forcorrect choices of N1 and N2. The LC residual should also be near zero when N1 and N2are correct. The problem in ambiguity resolution is that difference choices of N1 andN2 can make different linear combinations small. For example, errors in N1 and N2 of 3 and
39、4 cycles will change LC by 0.298 cycles (56.6 mm), MW-WL by 1 cycle and EX-WL by2.132 cycles (405 mm). On long baselines, at low elevation angles, ionospheric delays of 400 mm are common. The most common error is a N1=N2=1 cycle error. For thiscombination, the MW-WL is unaffected and LC changes by 0
40、.562 cyc (107 mm) and EX-WL by0.283 cyc (54 mm). Even on relative short baselines, 54 mm ionospheric delays are commonThe follow commands are use to control the ambiguity resolution. AMB_SET Sets parameters for ambiguity resolution. The input parameters are: Minumum of values need to allow bias fixi
41、ng Maximum number to be used in computing sigma of mean MW-WL Minimum sigma for LC and MW-WL for ambiguity fixinf Weighting factor for MW-WL in chi*2 Weighting factor for extra-wide lange Minimum sigma to assigned to float estimates of ambiguities. Max chi*2 value allowed for ambiguity to be resolve
42、d. EXWL_SET - magnitude of jump in EX-WL to have cycle slip added (default 0.10) - minimum sigma for mean ex-wl (cycles, default 0.02 cycles) - Scaling factor for length. Scale 0.1 results in 0.1 cycles over 100 km (default) - Elevation angle factor that increases sigma as (1 + factor/sin(elev) MWWL_SET
