Which calibration target is widely used because it provides a known radar cross-section?

Which calibration target is widely used because it provides a known radar cross-section?

• A. Corner Reflector
• B. Trihedral
• C. Dihedral
• D. Transponder

Answer: (A)

A corner reflector is used because its geometry yields a known, highly predictable radar cross-section. Made from three mutually perpendicular flat panels, it acts as a powerful retroreflector, sending most of the incident radar energy back toward the source across a wide range of angles. This creates a stable, repeatable RCS that engineers can calculate from the reflector’s size and the radar wavelength, making it an ideal reference target for calibrating amplitude, range, and overall system performance. Other targets either don’t produce a fixed, known RCS across angles (dihedrals can vary with orientation) or require active electronics (transponders), which adds variables to calibration.

A corner reflector is used because its geometry yields a known, highly predictable radar cross-section. Made from three mutually perpendicular flat panels, it acts as a powerful retroreflector, sending most of the incident radar energy back toward the source across a wide range of angles. This creates a stable, repeatable RCS that engineers can calculate from the reflector’s size and the radar wavelength, making it an ideal reference target for calibrating amplitude, range, and overall system performance. Other targets either don’t produce a fixed, known RCS across angles (dihedrals can vary with orientation) or require active electronics (transponders), which adds variables to calibration.