Design and Implementation of Baseband Module for FMCW Radar

This paper reports on the results of developing the baseband of a Frequency Modulation Continuous Wave (FMCW) radar which consists of a Digital-to-Analog Converter (DAC), an Analog-to-Digital Converter) and a Low Pass Filter (LPF). The DAC signal generation used to do the ramp. DAC modules implemented using the STM32F4 microcontroller has built-in DAC to generate the signal ramp according to specifications to be used. ADC module used to do the reading signal from the RF modules. Modules implemented using IC ADC ADC MCP3008. LPF module used to eliminate high-frequency components of the signal obtained in order to beat. Development of baseband module is linked to the development of Embedded System on the part of the GPR. The results of the reading of the DAC on the oscilloscope has been expected according to the specifications. The signal is the signal waves that form a ramp with Vmin = 2.4 V and Vmax = 10.4 V where the voltage is in the range of voltage in accordance with the specifications of the VCO tuning voltage used and refers to the frequency of the signal FMCW specifications used IE 2-2.75 GHz. LPF module characteristics as expected. The signal is passed through an LPF module with cutoff 10kHz increasingly muffled along with the increase in the frequency of the signal input module can eliminate LPF as well as high-frequency components have minimum value of the range 4 GHz ADC readings on the Results. signal processor have been expected according to the specifications. Signal beat can be reconstructed by ADC with sample rate 61kSPs. Baseband module has also been examined in the overall integrated testing. The dominant frequency of the signal obtained beat that shifts with the distance of the object.is study.