Regularly, time-frequency investigation is finished by sliding a window through the time area information and figuring the fourier transform of the information inside of the window. The decision of the window length figures out if specular or resounding data will be stressed. A slender window will confine specular reflections yet will not be sufficiently wide to oblige the gradually changing worldwide resonances. A wide window cannot transiently isolate reverberation and specular data, so we will adjust window length as per changes in frequencies. For this situation, we understand the determinations of LFM and Quadrature Phase Shift Keying (QPSK) signals. The quantitative performance of the proposed method is analyzed using average amplitude, output frequency and phase. The results prove that, the design of proposed method is very simple. So by using adaptive STFT, we can improvise the existing warfare and simplify the existing complex RADAR techniques.