DEVELOPMENT OF MODULAR FMCW (FREQUENCY-MODULATED CONTINUOUS WAVE) RADAR SYSTEM

• Main Author: DANIIL KURNIAWAN (NIM : 23216141), HENDRYADI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27812
• Institution: Institut Teknologi Bandung

Frequency-modulated CW is one of the most popular modulation type of CW radar. <br /> <br /> Its simple and low-cost implementation are some of the reasons that make FMCW <br /> <br /> radar attractive. FMCW radar has found its application in various fields such as <br /> <br /> automotive, obstacle penetration, and biomedical application. <br /> <br /> A modular and flexible FMCW radar system is developed in this thesis. The system <br /> <br /> is developed so that it can be a learning platform for radar system. The system <br /> <br /> is divided into three main modules: RF, BBIF, and SPD. RF module uses dechirpon- <br /> <br /> receiver configuration and operates at S-band (1.8 GHz up to 2.7 GHz). BBIF <br /> <br /> modules has two microcontrollers as its main components. It implements two approaches <br /> <br /> for generating chirp, one using DAC and the other using fractional-N <br /> <br /> PLL. SPD module is a software running in a PC for processing digitized beat signal. <br /> <br /> Three types of signal processing is implemented, they are range processing, <br /> <br /> Doppler processing, and SAR image processing. SPD module is also used to configure <br /> <br /> the system by setting the parameters of the system such as sampling rate, <br /> <br /> PRF, waveform, bandwitdh, etc. <br /> <br /> The maximum bandwidth of the generated signal is 900 MHz. Chirp generation <br /> <br /> with PLL gives a better range resolution than using the DAC approach. The smallest <br /> <br /> range resolution produced by the system is 0.2 m. A few experiments are done <br /> <br /> to test the performance of the designed FMCW radar system. These experiments <br /> <br /> include range measurement, Doppler measurement, and SAR image measurement. <br /> <br /> The result of range measurement is still affected by the PLL stability problem, while <br /> <br /> in Doppler measurement, this stability problem does not give much effect on the <br /> <br /> final result. The usage of RMA on the raw image data in SAR measurement gives a <br /> <br /> more focused image. The smallest object detected in SAR image has a width of 0.32 <br /> <br /> m.