1：Experimental Design and Method Selection:

The study involves designing a modular sensor system capable of full and compact polarimetric measurements at 77 GHz, using continuous wave (CW) or frequency-modulated continuous wave (FMCW) signals. Theoretical models for scattering vectors and decomposition methods (e.g., Pauli decomposition, compact decomposition) are employed.

2：Sample Selection and Data Sources:

Measurements are conducted using a square angled dihedral as a calibration target and a setup with plates to simulate single and double bounce scenarios.

3：List of Experimental Equipment and Materials:

The sensor system includes microstrip antennas (linearly and circularly polarized), a dielectric lens made of polyetherimide, RF-frontend components, power amplifiers, and A/D converters. Specific models or brands are not detailed.

4：Experimental Procedures and Operational Workflow:

The system is set up to transmit and receive polarized waves; impedance matching and axial ratio of antennas are measured using a pyramidal horn. Beam focusing with the lens is simulated and measured. Polarimetric measurements are performed with varying angles and modes (DCP and CTLR).

5：Data Analysis Methods:

Data is analyzed using scattering vector transformations, Pauli decomposition for full polarimetry, and compact decomposition (e.g., Stokes vector calculations) for DCP and CTLR modes, with results plotted and compared.