8 papers
Analysis and Approximation of Spatially Wideband Array Factor of Thinned Antenna Arrays
Marcin Wachowiak, André Bourdoux, Sofie Pollin
This work investigates the spatially wideband (SWB) array factor (AF) of linear thinned antenna arrays. The SWB AF is formulated as a matched filter and expressed as a spatially va…
3D Radar Imaging from the UAV Nadir
S. Hamed Javadi, Hichem Sahli, André Bourdoux
Radars improve the sensing robustness of UAVs by operating under poor lighting and weather conditions and seeing through occlusions such as vegetation. However, they suffer from po…
Analysis and Approximation of a Spatially Wideband Antenna Array Factor
Marcin Wachowiak, André Bourdoux, Sofie Pollin
This work investigates the spatially wideband (SWB) antenna array factor (AF) of uniform linear arrays. First, the SWB AF approximation is derived for narrowband (NB) signals and a…
Approximation of the Range Ambiguity Function in Near-field Sensing Systems
Marcin Wachowiak, André Bourdoux, Sofie Pollin
This paper investigates the range ambiguity function of near-field systems where bandwidth and near-field beamfocusing jointly determine the resolution. First, the general matched…
Sizing Antenna Arrays for Near-field Communication and Sensing
Marcin Wachowiak, André Bourdoux, Sofie Pollin
This paper presents key performance metrics for near-field communication and sensing systems and their scaling behavior as a function of the antenna array aperture. Analytical expr…
Analysis of the Range Ambiguity Function of Narrowband Near-field MIMO Sensing
Marcin Wachowiak, André Bourdoux, Sofie Pollin
This paper compares the sensing performance of a narrowband near-field system across several practical antenna array geometries and SIMO/MISO and MIMO configurations. For identical…
Aliased Time-Modulated Array OFDM Transmit System
Marcin Wachowiak, Kamil Yavuz Kapusuz, André Bourdoux +1
The time-modulated array is a simple array architecture in which each antenna is connected to an RF switch that serves as a modulator. The phase shift is achieved by digitally cont…
Frequency Diverse Array OFDM Transmit System with Partial Overlap in Frequency
Marcin Wachowiak, André Bourdoux, Sofie Pollin
A frequency-diverse array (FDA) is an alternative array architecture in which each antenna is preceded by a mixer instead of a phase shifter. The mixers introduce a frequency offse…