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The GNSS Measurement Tools code is provided for you to:
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read data from GnssLogger App,
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compute and visualize pseudoranges,
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compute weighted least squares position and velocity,
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view and analyze carrier phase (if it is present in the log file).
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Initial setup:
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1) Extract the contents of the zip file to a directory, for example:
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~/gpstools/*
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and include the directory '~/gpstools/opensource' in your matlab path:
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addpath('~/gpstools/opensource');
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(Note: the tilde '~' is a place holder, don't actually use it,
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fill in the actual complete path)
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2) Edit ProcessGnssMeasScript.m to add the demoFiles directory, as follows:
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dirName = '~/gpstools/opensource/demoFiles'
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(again, replace tilde '~' with actual complete path)
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3) Run ProcessGnssMeasScript.m, it will run with pre-recorded log files.
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To process a log file you collected from GnssLogger:
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1) save the log file in a directory
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2) edit ProcessGpsMeasScript.m, specify the file name and directory path
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3) run ProcessGpsMeasScript.m
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The code includes a function (GetNasaHourlyEphemeris.m) to read ephemeris
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files from the NASA's archive of Space Geodesy Data, ftp://cddis.gsfc.nasa.gov
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It will automatically go to the ftp when you have a new log file.
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On some systems you need to use passive mode FTP; if this is required, see
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The Mathworks site for how to do it.
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Or (simpler): get the appropriate ephemeris file 'by hand' from the Nasa ftp
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site (GetNasaHourlyEphemeris.m will tell you the correct url and filename),
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copy the file to the directory where your log file is,
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and GetNasaHourlyEphemeris.m will read it from there.
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For a summary of the open source GNSS Measurements Tools,
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see ~/gpstools/opensource/Contents.m
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or type 'help opensource' in matlab command window
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--------------------------------------------------------------------------------
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Platform specific notes:
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For Windows: use '\' (backslash), instead of '/' for directories.
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For Mac: when installing MATLAB.
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System Preferences --> Security & Privacy -->
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Allow Apps to be downloaded from: Mac App Store and identified developers
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Uncompress/Unzip utility called from GetNasaHourlyEphemeris.m:
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The ephemeris on the Nasa ftp is Unix-compressed. GetNasaHourlyEphemeris will
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automatically uncompress it, if you have the right uncompress function on your
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computer. If you need to install an unzip utility, see http://www.gpzip.org
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Then search for 'uncompress' in the GetNasaHourlyEphemeris function to find and
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edit the name of the unzip utility:
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unzipCommand='uncompress';%edit if your platform uses something different
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If you uncompress the file 'by hand' and rerun GetNasaHourlyEphemeris.m, it will
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read the uncompressed file.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Copyright 2016 Google Inc.
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%
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% Licensed under the Apache License, Version 2.0 (the "License");
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% you may not use this file except in compliance with the License.
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% You may obtain a copy of the License at
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%
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% http://www.apache.org/licenses/LICENSE-2.0
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%
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% Unless required by applicable law or agreed to in writing, software
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% distributed under the License is distributed on an "AS IS" BASIS,
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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% See the License for the specific language governing permissions and
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% limitations under the License.
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