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A029 GPR MEASUREMENTS AT THE SITE OF A GERMAN MEDIEVAL IMPERIAL PALATINATE SUMMARY 1 Measurements with the ground penetrating radar (GPR) are very useful in exploring archaeological sites. The main features are high resolution and fast data acquisition. In practice there are some problems which have to be overcome: low material contrast of the archaeological objects to the surrounding layers and strong reflective layers near the surface. Several processing steps are presented and discussed which were chosen to improve the signal to noise ratio. The results could be tested because parts of the area had been excavated several years ago