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Radar calibration is can be done with special trihedral reflectors in order to measure its maximum range with precisionusing different techniques. The next pictures show real 70m distance that radar is able to detect a 20cm trihedral reflector on a free space environment:<br>

The only way to compare the performance of different radars is by defining an specific test set up in order each radar can be compared in the same conditions. One of the most widely used techniques is based on the use of special trihedral reflectors. Trihedral reflectors are easy to build and stable representing a good reference to be sure the compared radars have the same target reflection characteristics.   The next pictures show an example of how to make this kind of measurements. First of all you have to find an scenario free of reflections that could disturb the measurements. Ideally you need a free space area of more than 300 meters. Then you put the radar on a stable basis and start doing measurements of the signal reflected by the thriedral reflector placed in front of the radar. You can start by placing the reflector at 10 meters distance far away from the radar and after that you move it in steps of 5 more meters far away until the radar gets a signal in the limits of the detection. A threshold of 10dB over the noise signal can be used as a reference. <br>

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