Signal Generator Design for LinFM CW Radar

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Rösner Vilmos
Department of Broadband Infocommunications and Electromagnetic Theory

The topic of my diploma thesis is the well-known FM CW radar, which has become more and more popular in recent years. Initially (the late 1960’s) these kinds of radars were used as precision short range altimeters in military and civil aviation, and were also used in naval applications (assisting the docking of ships under bad visibility conditions). Nowadays, FM CW radars are widely used as military scout equipment and as driving assistance in self-driving cars.

My work focuses on the generation of LinFM signals for illumination in CW applications. The goal was to gain better understanding of the signal parameters influencing the radar’s detection ability. I have analyzed the mechanism of detection and I derived the mathematics of reception. In the mathematical derivation, the degrading effect of phase noise is also discussed.

After discussing the theoretical considerations, I have elaborated the most common LinFM CW signal generator topologies in brief. Based on the chosen topology (Modulated Fractional-N synthesizers), the required signal generator was designed, built and measured. The design steps are presented in depth and each measurement result was evaluated.


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