Install and run GAMIT in Linux (1)

This document describes how to install GAMIT in a Linux operating system and how to use it in conjunction with an instance.

1. Introduction

With the development of GPS technology, it has been widely used in many disciplines, such as land survey, engineering survey, Earth dynamics, and GPS meteorology, the software for Precise Calculation of GPS observation data has also been paid attention to and developed. Many GPS data processing software have been developed at home and abroad, mainly including GAMIT software developed by the famous Massachusetts Institute of Technology (MIT) and the Cisco Institute of Marine Research (SIO), NASA) GIPSY-OASIS software developed by the Jet Propulsion Laboratory (JPL) and BERNESE software developed by the Institute of Astronomy at the University of BERNESE, Switzerland. This article mainly introduces GAMIT software. Its main feature is its high resolution accuracy and free open source code. Users can modify the source program as needed to facilitate scientific research.

2. Introduction to GAMIT

GAMIT can calculate satellite orbit, station coordinates, atmospheric delay, and integer ambiguity. It consists of the following modules: ARC (orbital integral), MODEL (composed of observation equations), SINCLN (weekly skip for Automatic Repair of single difference), and DBLCLN (weekly skip for Automatic Repair of double difference), CVIEW (Manual Interactive repair weekly hop), CFMRG (used to create M files required for SOLVE), and SOLVE (using double difference observation to SOLVE parameters by least square method ).

The data required by GAMIT is in the RINEX format and can be used to process data collected by various types of GPS receivers. Currently, GAMIT supports running on UNIX and LINUX operating systems. This document uses GAMIT 10.2 and LINUX RedHat 9.0 as examples to explain how to install and use GAMIT.

3. Software Installation

3.1 installation of LINUX

First, make sure that there is sufficient space on the computer to install LINUX. We recommend that you have at least 10 Gb of free space here. For LINUX system installation, you can choose to install from a CD, hard disk or network. Generally, you can choose to install from a CD. Insert the installation disc in the optical drive. After the boot from the disc, follow the instructions in the Installation Wizard to complete the installation of the LINUX system.

3.2 LINUX compiler update

In LINUX, MAXUNIT is 100 in the default file options of C and Fortran compiler systems, while in GAMIT software source code, MAXUNIT is 10000. If you directly install The GAMIT software without modification, many warning errors will occur, resulting in failure to run properly after installation. The steps for installing GCC are as follows: you can download the source code of GCC compiler 2.95.3 or later from the website (http://gcc.gnu.org), copy it to the/usr/gcc directory, and enter the directory, run the tar zxvf command to decompress it and find the fio under the gcc-2.95.3/libf2c/libI77/directory. h file, open it with the vi command, change the # define MAXUNIT 100 line to 10000, save it, return to the/usr/gcc directory, re-compile and install GCC.