QGis:

1. Add layer > Add delimited text (symbol of a comma) > Select the csv file (or txt file)
2. Check that qgis understand the different points. It must understand the header files. Maybe is necessary to modify the file in order to get the paremeters.
3. Definition of the geometry, tell what variables are every column. WS84 Elipsoid is the reference system.
4. Change the color of the markers, otherwise is a bit difficult to get them. It is possible to put some labels in order to distingish them.
5. Next is to add the KML file. Add layer, add vector layer, add the KML File. That rectangle is the coverage of the SAR data.

Asceding track, vz is positive.

6. We need to manually find the corner reflectors in the image. It is possible to make some operations, like power or log, to highligh the corner reflector. We get the azimuth and the slant range parameters.

Use the range-doppler equation:

In the excel we have the satellite position, the satellite velocity, but is every 10 second. We can do a polinomial approximation to get all the time. Xs is the satellite trajectory, Xp is the point in the map in cartesian (from qgis), the operation is ECEF in matlab. We need to find the time in azimuth that validate the doppler equation, that will gives us R_0. To compute the date there is funtion (provided by the professor) to make the conversion.

Next step, try to compute the condition of doppler equation

The objective is to get where is the corner reflector.

For the next class: Prepare a powerpoint with results.

Polinomial interpolation for each element (3 from xs). In order to get the order of the polinomial, remove one point of the series, and then with the other get the missing point, try to do it with more and more order, at some point you will not have an improvement of puting more orders.

After getting the time, we need to interpolate xs to get the solution of the slant range zero doppler equation. That is the next task. The R atmo is 0 for now. After that we should be able to get the pixel numbers. Use pulseRepetitionFrequency.

In range, we have the range of the start of the observation, with that we can get the range.

Question:

• Now we have the time of 0 doppler in azimuth, is the same in slant range? What is the next task to do?