In this research, experiments on signal processing on radar system is conducted. Inside radar system, digital signal processing (DSP) and analog-to-digital converter (ADC) are necessary for obtaining the results of image detection using filtering, sampling and windowing method. X-band frequency of 9,3 GHz is used. Frequencies other than 9,26 Ghz - 9,34 GHz are suppressed by filter. One of the methods in designing a finite impulse response (FIR) digital filter is windowing method. In this study, Hamming and Blackman window type are used in QT software. Testing is done by taking 512, 1024 and 16384 frame length. The experiment is done for all frequency bands. Parameters tested in this filter implementation are amplitude response and signal-to-noise ratio (SNR). Experiment result showed no significant difference for both windows. Hence, it is no problem to choose whichever the window from these choice for this system.