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%ProcessGnssMeasScript.m, script to read GnssLogger output, compute and plot:
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% pseudoranges, C/No, and weighted least squares PVT solution
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%
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% you can run the data in pseudoranges log files provided for you:
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prFileName = 'pseudoranges_log_2016_06_30_21_26_07.txt'; %with duty cycling, no carrier phase
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% prFileName = 'pseudoranges_log_2016_08_22_14_45_50.txt'; %no duty cycling, with carrier phase
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% as follows
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% 1) copy everything from GitHub google/gps-measurement-tools/ to
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% a local directory on your machine
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% 2) change 'dirName = ...' to match the local directory you are using:
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dirName = '~/Documents/MATLAB/gpstools/opensource/demoFiles';
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% 3) run ProcessGnssMeasScript.m script file
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%Author: Frank van Diggelen
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%Open Source code for processing Android GNSS Measurements
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%% data
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%To add your own data:
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% save data from GnssLogger App, and edit dirName and prFileName appropriately
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%dirName = 'put the full path for your directory here';
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%prFileName = 'put the pseudoranges log file name here';
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%% parameters
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param.llaTrueDegDegM = [];
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%enter true WGS84 lla, if you know it:
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param.llaTrueDegDegM = [37.422578, -122.081678, -28];%Charleston Park Test Site
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%% Set the data filter and Read log file
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dataFilter = SetDataFilter;
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[gnssRaw,gnssAnalysis] = ReadGnssLogger(dirName,prFileName,dataFilter,param);
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%% Get online ephemeris from Nasa ftp, first compute UTC Time from gnssRaw:
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fctSeconds = 1e-3*double(gnssRaw.allRxMillis(end));
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gpsTime = [0,0];
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gpsTime(1) = floor(fctSeconds./GpsConstants.WEEKSEC);
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gpsTime(2) = fctSeconds - gpsTime(1)*GpsConstants.WEEKSEC;
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utcTime = Gps2Utc(gpsTime);
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allGpsEph = GetNasaHourlyEphemeris(utcTime,dirName);
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%% process raw measurements, compute pseudoranges:
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[gnssMeas] = ProcessGnssMeas(gnssRaw);
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%% plot pseudoranges and pseudorange rates
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h1 = figure;
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[colors] = PlotPseudoranges(gnssMeas,prFileName);
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h2 = figure;
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PlotPseudorangeRates(gnssMeas,prFileName,colors);
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h3 = figure;
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PlotCno(gnssMeas,prFileName,colors);
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%% compute WLS position and velocity
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gpsPvt = GpsWlsPvt(gnssMeas,allGpsEph);
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%% plot Pvt results
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h4 = figure;
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ts = 'Raw Pseudoranges, Weighted Least Squares solution';
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PlotPvt(gpsPvt,prFileName,param.llaTrueDegDegM,ts); drawnow;
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h5 = figure;
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PlotPvtStates(gpsPvt,prFileName);
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%% Plot Accumulated Delta Range
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if any(any(isfinite(gnssMeas.AdrM) & gnssMeas.AdrM~=0))
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[gnssMeas]= ProcessAdr(gnssMeas);
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h6 = figure;
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PlotAdr(gnssMeas,prFileName,colors);
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[adrResid]= GpsAdrResiduals(gnssMeas,allGpsEph,param.llaTrueDegDegM);drawnow
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h7 = figure;
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PlotAdrResids(adrResid,gnssMeas,prFileName,colors);
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end
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%% end of ProcessGnssMeasScript
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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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