Our paper reviews orthogonal waveforms for spaceborne Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO-SAR), a first-of-its-kind comparison. We provide a catalogue of waveform performance parameters and an ambiguity function analysis, serving as decision rules for optimal waveform selection in MIMO-SAR design.

Monitoring vital signs without direct contact improves patient comfort and reduces measurement disturbances. Our research explores a radar-based approach to detect heartbeats without sensors attached to the body. Using a 24 GHz radar system, we developed advanced signal processing methods to ensure accurate detection. The results closely match conventional ECG (electrocardiography) measurements, demonstrating the potential of radar technology for future medical and home-care applications.

This study explores low-cost manufacturing of waveguide components for radio frequency applications. Using 3D printing and metallic coatings, performance is optimized while reducing costs. Tests show improved conductivity enhances efficiency. The findings highlight additive manufacturing as a viable alternative to industrial components, making high-frequency technology more accessible.

Analyses of more than four decades (1979–2024) of  mean horizontal winds in the mesopause region at about 90 km  altitude show long-term trends and an influence of the 11-year solar cycle. After the 1990s, both linear trends and the solar cycle effect change and strongly weaken, indicating a change in dynamics or solar forcing. Gravity wave proxies also show a solar cycle effect, which decreases after the 1990s.

Using 30 years of radar observations at Andøya, this study presents the world’s longest record of a rare summer phenomenon high above the Arctic. The season lasts about 104 days and is gradually starting earlier and ending later. Even after accounting for solar and geomagnetic effects, a small but steady rise remains. The strongest signals occur about 84 km up and show no long-term change, offering new insight into ongoing shifts in the upper atmosphere.

A modified dyadic kernel for surface integral equations of transverse-electric wave scattering by impenetrable shapes is presented. It uses auxiliary magnetic multipole components to reduce the broadside interactions between surface regions and, thus, enhance the rank deficiency of the corresponding matrix operator blocks. Its structure enables its application for various scatterer shapes and fast solver acceleration with controllable accuracy within a broad error threshold range.

Radar waves are able to penetrate through materials like cardboard or plastics and thus are able to inspect hidden objects. A 3D inspection system based on radar imaging is introduced. Opposed to X-Ray imaging, no harmful radiation is used. The system scans through the object, while it is passing on a conveyor belt. The inspection system uses a curved antenna layout, which is shown to have higher resolution than flat layouts. For processing, a custom flexible and performant algorithm is derived.