Abstract:

In response to the current situation that general vehicle-mounted radars either do not have the ability to measure height or are expensive in doing it,this paper proposes a single scattering point target height measurement method using time-domain information on the single antenna in the millimeter band.The method utilizes the multipath propagation generated by the interference between the ground reflected multipath signal and the direct signal in the vehicle environment,obtains the echo power of the target at different distances while the vehicle is moving,uniformizes the sampling points in the inverse of the distance by interpolation,and then extracts the height information of the target using the fast Fourier transform.In this paper,first,the conditions for multipath propagation in the vehicle environment are derived,the geometric model through the specular reflection of the ground in the millimeter band is constructed,and then the mathematical model of multipath propagation is derived;second,the factors that may affect the measurement of the height of the target,such as the installation height of the radar,the sampling interval and distance,are analyzed in detail,and various suggestions for optimization are proposed.Finally,the results of simulations and the real data obtained from experiments show that it is feasible to use this method for the measurement of the height of single scattering point targets.Compared with the existing methods,this method has the advantages of easy-structuring and cost-effectiveness in achieving the measurement of the height of a single scattering point target in vehicle environment.

Key words: millimeter-wave radar, time-domain signal processing, height measurement, multipath propagation