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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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