I understand that you seek guidance in shortlisting the satellites based on a particular condition i.e. orbital inclination greater than 20 degrees. To display only these satellites in the Satellite Scenario Viewer, it requires parsing the TLE file to extract orbital parameters, identify the satellites that satisfy the inclination criteria, and then selectively visualize those specific satellites in the scenario viewer.
Following Step 2, where I have applied filters to isolate satellites that meet the specific criteria, I proceed to Step 4. In this step, I process each of the shortlisted satellites. For each one, I determine its precise location within the input file (`file.txt`), then proceed to record not only the satellite's name but also the subsequent two lines of data into the output file (`filteredSatellites.txt`). This output file is then passed on to the "scenarioViewer" function for visualiztion purpose.
Here is a MATLAB code snippet that demonstrates the process
% Step 1: read the TLE file and parse it
tleData = tleread('file.txt');
% Step 2: filter satellites based on inclination
selectedSatellites = {};
for i = 1:length(tleData)
inclination = tleData(i).Inclination;
if inclination > 20
selectedSatellites{end+1} = tleData(i);
end
end
% Step 3: create a satellite scenario
startTime = datetime(2023, 1, 1, 0, 0, 0);
stopTime = startTime + days(1);
sampleTime = 60; % in seconds
sc = satelliteScenario(startTime, stopTime, sampleTime);
% Step 4: write selected satellites to a txt file
outputFile = "filteredSatellites.txt";
out = fopen(outputFile, 'w');
for i = 1:length(selectedSatellites)
% extract name for the satellite
satelliteName = selectedSatellites{i}.Name;
% writeNextTwoLines locates the position of selectedSatellite
% within the input file 'file.txt'
writeNextTwoLines = false;
linesToWrite = 2;
f = fopen('file.txt', 'r');
while ~feof(f)
currLine = fgets(f);
if contains(currLine, satelliteName)
fprintf(out, '%s\n', satelliteName);
writeNextTwoLines = true;
continue
end
% selected satellite is found then, and the next two
% lines are written to the output file
if writeNextTwoLines & linesToWrite
fprintf(out, '%s', currLine);
linesToWrite = linesToWrite - 1;
end
end
fclose(f);
end
fclose(out);
sat = satellite(sc, 'filteredSatellites.txt');
% Step 5: visualization
viewer = satelliteScenarioViewer(sc);
Have a look at the following references for a better understanding
I hope this helps.
