Approaching/Receding Target Detection using CW Radar

In this work, a new frequency shifting technique is proposed. Using this technique, direction (Approaching/Receding) of the target can be determined using a continuous wave (CW) Radar system. In general, in the classical technique, a huge complex computation is required to find the direction of the target using CWR radar which motivated us to develop a simple and straight-forward technique which is the main contribution presented in this paper. For this, a CW Radar system is designed, with required RF subsystems and signal processing unit. For designing the RF section off the shelf RF components are used. An eight-channel analog to digital converter (ADC) and Field Programmable Gate Array (FPGA) is used for analog to digital conversion and data acquisition. To get the target information from the received signal, signal processing is done in MATLAB. To get Doppler information from the received signal Fast Fourier Transform (FFT) and short-time Fourier transform (STFT) is used. This system is calibrated and range is calculated using a known Radar Cross-section (RCS) of the target.