Linear frequency modulation - continuous wave (LFM - CW) radar implementation using GNU radio and USRP

In this paper, the results of previous research on the beat frequency filter for the LFM-CW Radar is applied for the realization of GNU software into radio and applied on the USRP. The beat frequency components for distances of 10 km, 50 km and 70 km respectively were found around the frequencies of 66 kHz, 330 kHz, and 460 kHz. By using MATLAB simulation, the computed results are 66.67 kHz, 333.33 kHz, and 466.67 kHz. As it occurs in the observation of the targets, frequency components obtained from the frequency spectrum can be divided into two parts, namely, the negative frequency components and the positive frequency components, where one component of this frequency is a reflection of the other frequency components. Therefore, the negative frequency components can be ignored. By observing at the positive frequency components, our experiment shows that the frequency spectrum shape of the output of the WX GUI FFT block is already similar with the simulation results by using the MATLAB®.