TUHH Open Research
 

Determination of the radar channel transfer matrix in the near field of electrically large targets based on physical optics principles

Start Page
118
End Page
123
Citation
26th International Microwave and Radar Conference, MIKON 2026
Contribution to Conference
26th International Microwave and Radar Conference, MIKON 2026  
Publisher DOI
10.23919/MIKON66970.2026.11577874
Scopus ID
2-s2.0-105044556746
Publisher
IEEE
ISBN of container
978-83-969726-7-5
This contribution deals with the determination of the radar channel transfer matrix in short-range radar applications. In these, the radar antennas are often located in the near field of an electrically large target, in which the scattering properties, in contrast to far-field relationships, depend on distance as well as the antenna. Based on physical optics and the antenna radiation pattern, a bistatic complex-valued transfer function between the feed of a transmit antenna and the output port of a receive antenna is derived. For multiple antennas, it extends to a channel matrix, which allows to predict the radar response of multiple-input multiple-output (MIMO) systems as well as antenna arrays. Measurements of the channel matrix in the case of a disk target conducted with horn and open-ended waveguide antennas at 24 GHz prove the validity of the proposed approach. It accurately predicts near-field effects such as power level fading and nonlinear phase distortion for MIMO radar configurations.
Subjects
Arrays
bistatic scattering
channel modeling
multiple-input multiple-output (MIMO)
multistatic
near-field effects
physical optics
radar
radar cross section (RCS)
wave propagation
DDC Class
621.38: Electronics, Communications Engineering
621.3: Electrical Engineering, Electronic Engineering