GAMIT solution-detailed steps

GAMIT solution-detailed steps

I. Data Preparation

1. Update related tables files;

2. Download the precision calendar. // The product starts with igu, igr, And IG;

3. download broadcast calendars; // download the integrated calendars, which are generally started with brdc.

4. download the IMG data. // some websites do not exist on some servers. You need to download data from multiple servers. If you download an o file in compressed format, use the crx2rnx Command provided by gamit to convert the format;

Ii. Core File Configuration

1. lfile.

1. Proposed the XYZ position in the o file header of each test site;

1.2.download the itrfframework license file named itrf2000_gps.ssc.txt] from the website. The file contains the XYZ coordinates under 84;

. Use the tform tool in Ubuntu to convert it to the spherical coordinate;

2.station.info // note the antenna height settings

2. 1. Download The station.info file from the website, which contains the antenna parameters used by each test site for a certain period of time;

2. copy the entry from the complete station.info file and enter a new entry based on the local antenna;

3. sestbl.

Type of analysis = 0-iter

; // Number of iterations [calculation result is calculated again as the initial value]

Choice of experiment = relax. // use relax to improve the accuracy of the point position. If the goal is to calculate the adjustment after the baseline, use baseline;

Zenith delay = N; // for short baselines

4. sittbl.

4. 1. Download The sittbl. refined file, which contains a recent evaluation of the reliability of each site;

. Create a sittbl file and use the above file entries + precise entries at the initial locations of each site;

If the accuracy of the point position is high, the restrictions on the ignsite are smaller, that is, the ignsite is very accurate and highly constrained, if the goal is to calculate the adjustment after the baseline, you can set the constraints of the IG station to a greater value;

Iii. Solving Process

The following is the computed bat file:

// 1. Create a working directory (call various files here)

Mkdir workspace

Cd workspace

Rm-f *

// 2. link the o file, sp3 file, and copy the broadcast calendar file;

Ln-s ../rinex/*. 09o.

Ln-s ../IG/*. 09o.

Cp ../brdc $1 * eexample9. $1

Ln-s ../IG/ig $2. sp3.

// 3. link the relevant tables Table File

Links. day 2009 $1 example

// 4. Create a computing project

Sh_makexp-expt example-orbt example-yr 2009-doy $1-sess 0-nav eexample9. $1-sinfo 30 00 00 2880

// 5. Orbital points

Sh_sp3fit-f igs $2. sp3-o example

// 6. Check the g File

Sh_check_sess-sess $1-type gfile-file gexample9. $1

// 7. Create a j File

Makej eexample9. $1

Jexample9. $1

// 8. Check the g File

Sh_check_sess-sess $1-type jfile-file jexample9. $1

// 9. Generate the observation File

Makex example. makex. batch

GAMIT reading: l

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