The performance of coherent acoustic communication systems involving moving platforms (e.g., underwater vehicles and ships) is adversely effected by Doppler shift resulting from relative motion of the transmitter and receiver. This paper presents a series of innovations which, together, dramatically improve the response to Doppler shift of a widely-used adaptive receiver algorithm. The innovati...

The helicity-rotation coupling and its current empirical basis are examined. The modification of the Doppler effect due to the coupling of photon spin with the rotation of the observer is considered in detail in connection with its applications in the Doppler tracking of spacecraft. Further implications of this coupling and the possibility of searching for it in the intensity response of a rota...

We describe the concept of Doppler asymmetric spatial heterodyne spectroscopy (DASH) and present a laboratory Doppler-shift measurement using an infrared laser line. DASH is a modification of spatial heterodyne spectroscopy optimized for high precision, high accuracy Doppler-shift measurements of atmospheric emission lines either from the ground or a satellite. We discuss DASH design considerat...

DVOR (Doppler VHF Omnidirectional Range) equipment is used by pilots as a navigation aid when the plane about to land at destination airport. an air guide aircraft in order perfectly airport, where functions provide information form of azimuth, bearing frequency range 108 MHz - 118 using Doppler effect. If remote control system unit (RSCU) damaged, it will prevent from landing because there no ...

We present a new method for multitarget tracking in wireless sensor networks (WSNs) based on chirplet decomposition. In all sensors of the network, reflected signals from targets are decomposed into chirplets. Through this new formulation, after clutter rejection, the delay and Doppler are expressed in terms of chirplet parameters. As an advantage of this strategy, the background noise may assu...

The performance of a wireless communications system is largely guided by the Bit Error Rate that the system experiences on a given wireless channel. The issue of wireless channel equalization and tracking has attracted increased attention in recent years. These techniques are able to provide significant enhancements in performance in some of the most severe channel conditions with time-varying ...

Transesophageal echocardiography (TEE) has advanced the role of the cardiovascular anesthesiologist and increased his/her active role and obligations during perioperative patient care. Assessment of global and regional left ventricular (LV) function consists of two-dimensional (2D) or Doppler evaluation of cardiac structures and their interaction with blood flow. The techniques used are mostly ...