OpenGPSSim simulation program is a gps, you understand the study and GPS are a great help

opengpssim-061013
.................\opengpssim
.................\..........\bin
.................\..........\...\current.eph
.................\..........\...\gpsrcvr.log
.................\..........\...\rcvr_par.dat
.................\..........\...\xmit_par.dat
.................\..........\changelog
.................\..........\copying
.................\..........\data
.................\..........\....\393540x36.g12
.................\..........\....\curloc.dat
.................\..........\....\current.alm
.................\..........\....\current.eph
.................\..........\....\ion_utc.dat
.................\..........\....\nav-01-template-01-06.txt
.................\..........\....\nav-11-template-01-06.txt
.................\..........\doc
.................\..........\...\dataformats.txt
.................\..........\encdec
.................\..........\......\Makefile
.................\..........\......\ogsencdec.c
.................\..........\......\ogsgar2rnx.c
.................\..........\......\ogsinout.c
.................\..........\......\ogsoptions.c
.................\..........\include
.................\..........\.......\boxmuller.h
.................\..........\.......\ogsdefine.h
.................\..........\.......\ogsextern.h
.................\..........\.......\ogslibrary.h
.................\..........\.......\ogsnavdecode.h
.................\..........\.......\ogsnavencode.h
.................\..........\.......\ogsprototypes.h
.................\..........\.......\ogsstructs.h
.................\..........\lib
.................\..........\...\getopt.c
.................\..........\...\ogsionavasc.c
.................\..........\...\ogslibrary.c
.................\..........\...\ogsnavascii.c
.................\..........\...\ogsnavdecode.c
.................\..........\...\ogsnavencode.c
.................\..........\rcvr
.................\..........\....\copying
.................\..........\....\correlator.c
.................\..........\....\current.eph
.................\..........\....\gp2021.c
.................\..........\....\gpsfuncs.c
.................\..........\....\gpsrcvr.c
.................\..........\....\Makefile
.................\..........\....\ogsinout.c
.................\..........\....\ogsoptions.c
.................\..........\....\ogsrcvr.c
.................\..........\....\warranty
.................\..........\readme
.................\..........\warranty
.................\..........\xmit
.................\..........\....\boxmuller.c
.................\..........\....\copying
.................\..........\....\Makefile
.................\..........\....\ogsoptions.c
.................\..........\....\ogsxmit.c
.................\..........\....\warranty

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