Near-Field Propagation Method
Calculate scattering off target surfaces, including multi-path interactions with ground reflections, using ray-tracing algorithms and physics-based calculations specifically adapted for automotive radar applications.
WaveFarer’s ray-tracing technique combines traditional far-field RCS methods with urban propagation analysis in order to provide a unique solution for the challenges facing automotive radar engineers. Futher, near field scattering techniques increase accuracy at millimeter wave frequencies.
Multiple near-field propagation characteristics are accounted for in WaveFarer’s automotive radar simulation technique, increasing accuracy. First, transmitters emit spherical waves, modified by complex antenna radiation patterns, causing non-uniform wavefronts to be incident on target objects. This is an enhancement over traditional far-field RCS methods that use a plane wave excitation with a constant phase front to illuminate targets. This leads to more accurate phase information at the receiving antennas.
Second, WaveFarer’s surface integration calculations have been formulated to allow receivers and secondary scatterers to be in the near-field and Fresnel regions of the target. This is required because the far-field region of a vehicle at 24 and 79 GHz extends well beyond the location of the receiver. This is another enhancement over traditional far-field RCS methods because it removes the assumption that the receiver is in the far-field region of the target.
Ray-tracing techniques accumulate reflections and diffractions along a ray’s path as it interacts with the ground, target, and secondary scatters. WaveFarer supports up to 30 reflections and three diffractions along any single ray path.
Attenuation due to H2O and O2 molecules is accounted for in WaveFarer’s propagation model. Users have the ability to use a vacuum, standard atmosphere, or to specify custom values for pressure, temperature, and relative humidity.
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