This blog is interesting and might be relevant:
https://hforsten.com/ There are blessedly few entries; clearly he is someone to be respected for not succombing to the "look at me" and "I opened a box and it works as expected" syndromes
MIMO radar antenna arrays
Short introduction to multiple input multiple output (MIMO) radar antenna arrays
Backprojection Backpropagation
Even better focused homemade SAR images with timedomain backprojection algorithm and automatic differentiation based autofocus.
Synthetic-aperture radar imaging
Differentiable synthetic-aperture radar image formation with Tensorflow. Including very fast image formation and autofocusing utilizing GPU.
Third version of homemade 6 GHz FMCW radar
New and improved version of the 6 GHz FMCW radar with two receiver channels.
TRL measurements with homemade VNA and open source software
Measuring transmission line parameters of 50 ohm microstrip on OSH park 4 layer process and S-parameters of 1 nF SMD capacitor.
Improved homemade VNA
Second version of the homemade 30 MHz - 6 GHz VNA with improved performance
RF power detector and scalar network analyzer
Next on the list of homemade RF test equipment is RF power meter. I decided to make one to calibrate the output power of my VNA and to also measure output power of the previous radar projects.
Cheap homemade 30 MHz - 6 GHz vector network analyzer
Vector network analyzers are used to measure high frequency circuits, unfortunately they are too expensive for student budget so I decided to make one myself for small budget.
Heartbeat detection with radar
Phase of the radar baseband signal is very sensitive to movement allowing to detect small movements caused by breathing and heartbeat.
Homemade synthetic aperture radar
Second version of the 6 GHz FMCW radar now with SAR images
Horn antenna for radar
Designing and fabricating better antennas for the radar
6 GHz frequency modulated radar
Making a cheap and simple radar with a range of about 100 meters.