This paper describes the feasibility and implementation of a time domain facility for Radar Cross Section (RCS) measurements. Main advantages of measuring in the time domain are the high range resolution and the application of direct gating. The limited signal to noise ratio can be a disadvantage. The measurements have been performed with software tool XFDTD using two 2-12 GHz ridged horn antennas and rugby antennas respectively. Because the horns are not designed for transmitting transient signals, an additional system response measurement in combination with a software de convolution algorithm restores the impulse response of the object under test. Further processing separates the object response from clutter contributions. A comparison of the time domain data with calculated and measured frequency domain radar cross sections shows a good agreement. The high range resolution enables the separation of scattering mechanisms (i.e. reaction, single and multiple diffraction. It is concluded that the time domain RCS measurement system is an attractive alternative of its frequency domain equivalent. However, the decision to measure in the time or frequency domain will depend on the specific aim of each experiment.