Which procedure is employed to ensure that a radar-based system is functioning adequately?

Calibration against standard activity is essential to ensure that a radar-based system is functioning adequately. This procedure involves comparing the system's performance to established benchmarks or standards, which allows for the identification of any discrepancies or deviations from expected performance. Calibration helps maintain the accuracy and reliability of the radar system, ensuring it operates correctly in its intended applications, such as detecting objects or measuring distances.

Simulation of actual usage can help assess how well the system performs in real-world conditions, but it does not directly confirm that the system meets precise technical specifications. Training of personnel is important for ensuring operators can use the system effectively, yet it does not address the technical performance of the system itself. Management of equipment inventory is crucial for maintaining operational efficiency but also does not pertain to the performance verification of the radar system. Each of the other choices contributes to the overall operation of the radar system, but only calibration explicitly verifies its functioning against established standards.