The Doppler shift of the quasiparticle dispersion by charge currents is responsible for critical supercurrents in superconductors and instabilities magnetic ground state metallic ferromagnets. Here we predict an analogous effect thin films insulators which microwaves emitted a proximity stripline generate coherent chiral spin that cause magnon dispersion. spin-wave instability suppressed magnon...

The rotational Doppler shift (RDS) is typically measured by illuminating a rotating target with laser prepared in simple, known orbital angular momentum (OAM) superposition. We establish theoretically and experimentally that detecting the does not require incident light to have well-defined OAM spectrum but instead requires correlations within spectrum. demonstrate measurement of using spatiall...

This paper investigates the effects that the Doppler shift will theoretically have on a complex ultrasonic rangefinding system that utilizes a ring of concurrently operating sensors, using unique codes to reduce cross-talk between individual sensors. A methodology for selecting pseudorandom codes to maximize autocorrelation performance, maximize Doppler tolerance, and minimize cross-talk is pre...

A coherent optical processor for displaying a signal's ambiguity function is described. The required time delay is realized by 45 degrees rotations of two identical input transparencies and the Doppler shift by a 1-D Fourier transformation. The entire ambiguity function is displayed in the output (Doppler shift-time delay) plane. Examples of the optically computed ambiguity function for single ...

There is a basic constraint imposed on radar measurements when the transmitted signal is a simple, CW pulse. As a result, the radardesigner may wish to use a more complex signal and thereby extract more information from an echoing object. Unfortunately, the processed returns of the sophisticated waveforms usually consist of a peak response and small adjacent responses (called "time sidelobes") ...

—It is challenging to estimate the wireless channel of the Orthogonal Frequency-Division Multiplexing (OFDM) broadband system under a changing communication environment. The difficulty is mainly attributed to this wireless channel’s Non Wide Sense Stationary Uncorrelated Scattering (Non-WSSUS) which has an implication that the delay and Doppler shift of such a channel are non-stationary and co...

The airborne coherent Doppler lidar could provide the wind velocity relative to the motion of the lidar. The retrieval algorithms are complex corresponding to Ground-based lidar, due to the Doppler shift caused by mobile platform. This article gives a thorough analysis of the wind retrieval algorithms for the wind products of airborne Doppler lidar, include the correction for the lidar velocity...

Under the high dynamic conditions, Global Navigation Satellite System (GNSS) signals produce great Doppler frequency shifts, which hinders the fast acquisition of signals. Inertial Navigation System (INS)-aided acquisition can improve the acquisition performance, whereas the accuracy of Doppler shift and code phase estimation are mainly determined by the INS precision. The relation between the ...