Conceptual Framework for Remote Height Estimation Using 94 GHz Dual-Point Doppler Radar

Collisions involving over-height vehicles and low-clearance structures pose serious safety hazards and cause substantial economic damage. This paper presents a conceptual framework for remote roof height estimation of moving vehicles using a 94 GHz radar system. By analyzing Doppler returns from both the vehicle's roof and wheels, the approach eliminates dependence on vehicle speed. In a scaled-model experiment, measured Doppler shifts of approximately 560 Hz (roof) and 450 Hz (wheels) yielded an estimated roof height of 0.305 m compared to the model's actual height of 0.30 m. The paper emphasizes the conceptual basis and numerical observations without presenting the full derivation.