What is a trihedral corner reflector and what is it used for in radar calibration?

What is a trihedral corner reflector and what is it used for in radar calibration?

• A. A high-power transmitter used for calibration of timing.
• B. A dynamic target used to simulate moving weather patterns.
• C. An antenna housing element to calibrate polarization.
• D. A passive calibration target with known RCS, used to calibrate range and bearing accuracy.

Answer: (D)

A trihedral corner reflector is a passive calibration target with a known radar cross section. It’s made from three flat metal faces that meet at right angles, forming a corner. When radar signals strike it, the waves reflect back toward the source in a predictable, strong echo due to the multiple reflections off the three perpendicular surfaces. Because its geometry and RCS are fixed and well known, it provides a stable reference for calibrating radar measurements. This makes it ideal for checking range accuracy (based on the exact round-trip travel time to the target) and bearing or angle accuracy (since the return direction is predictable when the reflector is properly oriented). It is not a transmitter, not a moving target, and not part of an antenna housing; it’s simply a reliable, passive target used to calibrate radar performance.

A trihedral corner reflector is a passive calibration target with a known radar cross section. It’s made from three flat metal faces that meet at right angles, forming a corner. When radar signals strike it, the waves reflect back toward the source in a predictable, strong echo due to the multiple reflections off the three perpendicular surfaces. Because its geometry and RCS are fixed and well known, it provides a stable reference for calibrating radar measurements.

This makes it ideal for checking range accuracy (based on the exact round-trip travel time to the target) and bearing or angle accuracy (since the return direction is predictable when the reflector is properly oriented). It is not a transmitter, not a moving target, and not part of an antenna housing; it’s simply a reliable, passive target used to calibrate radar performance.