Examenspresentation av Gitanjali Raghu

Examinator: Henk Wymeersch

Abstract:

LFM (linear frequency modulated) FMCW (frequency modulated continuous wave) radars have long been used in the automotive industry for safety purposes. However, their resolution in range, velocity and angular estimation may limit their ability to identify objects in the environment specifically. 4D Imaging radars attempt to address this problem with high resolution MIMO (multiple-input multiple-output) radars, but require complex processing algorithms to separate and identify objects. The solution proposed is a radar-centric JCAS (joint communication and sensing) system using backscatter communication. Although research has been done on such systems, little information is found about the impact of FMCW data modulation on the radar's sensing system. This thesis uses a RIS-aided (reconfigurable intelligence surface-aided), mmWave (millimeter wave) JCAS system to study the effect of data modulation on the range profile and the range-doppler map, varying communication parameters such as the bit duration, chirp and frame fraction modulated. It is shown that increasing communication rates adversely affects sensing output. Carefully considering the trade-off between communication and sensing outputs to ensure range and velocity estimation suffers little to no degradation allows for low rates of communication in the order of kilohertz.

Welcome!

Gitanjali and Henk