Calibration is used to ensure radar measurements stay accurate over time. Which of the following best describes a calibration test?

• A. A test to verify display brightness.
• B. A test to update software.
• C. A test to measure and adjust range and bearing against known references.
• D. Calibration aligns range and bearing measurements with true values, ensuring accuracy and consistent performance.

Answer: (D)

Calibration tests bring radar measurements into agreement with known, precise references. By using targets or references with known range and bearing, the radar’s reported values are compared to the true values, and adjustments are made so future readings match those truths. This process counteracts drift from temperature, aging, or other changes, keeping both range and bearing accurate and the system performing consistently over time. The defining idea is aligning the measured range and bearing with their true values to ensure ongoing accuracy, which is what makes this description the best fit.