Design and analysis of two-dimensional optical operators
PhD. Thesis defined for Mr. Mohammad Mehdi Janforoz
Abstract :
In recent years, the application of continuous wave radars has expanded into various
domains, including medicine, Advanced Driver Assistance Systems (ADAS) for speed
control and obstacle detection on roads, precise imaging, hand motion detection, aircraft
navigation, space applications, and mining exploration. One of the most commonly used
types of these radars is short-range radars. This research aims to present and design a new
structure for a short-range radar specifically used for detecting vital signs such as heart
rate (HR) and respiratory rate (RR). In addition to addressing past challenges, optimized
characteristics are obtained.
To achieve this goal, considering the problem scenario, a structure based on Discrete
Frequency Modulated Continuous Wave Radar (SFCW) is introduced. It employs a
Frequency-Scanning Array using an optimized injection-locked phase-locked loop and
low-IF architecture, effectively reducing phase noise and enabling the detection and
tracking of desired targets.
By selecting a suitable system and circuit architecture, as well as signal modulation,
some challenges inherent in other structures have been successfully mitigated. Another
feature of this structure is the simultaneous use of a single antenna for both transmission
and reception, which simplifies the design while maintaining performance to the extent
possible.
Keywords: ADAS, Bio radar, HR and RR, self-injection oscillator, Sub-Sampling PLL
