Arizona State University
When
Where
Dynamic Doppler Effects in 3D Space: Acceleration and Sensor Path Geometry
The complexity of modern wireless communication systems poses new challenges for signal processing. Low-Earth-Orbit (LEO) satellite constellations for example, which will play an important role in future Internet and wireless communications (e.g., 5G New Radio and beyond non-terrestrial networks), travel at high velocities and can be significantly affected by space weather, requiring adjustments to orbital paths. In this talk, I establish and interpret the spectral perturbations of receiver signals caused by changes in speed, i.e., acceleration and jolt, and changes in the direction of velocity, i.e., the 3D geometry of the receiver path, which together form the building blocks of arbitrary nonlinear motion. I characterize the dependence of the spectrum on curvature, torsion, and the relative direction of wave propagation to the Frenet-Serret frame. I also introduce a physics-informed randomized algorithm to estimate transmitted EM signals propagating in stratified media from receiver time series data obtained along nonlinear trajectories in space.