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The Doppler Effect
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The Micro-doppler Effect in Radar
The Doppler Effect can be thought of as the change in frequency of a wave for an observer moving relative to the source of the wave. In radar, it is used to measure the velocity of detected objects. This highly practical resource provides thorough working knowledge of the micro-Doppler effect in radar, including its principles, applications and implementation with MATLAB codes. The book presents code for simulating radar backscattering from targets with various motions, generating micro-Doppler signatures, and analyzing the characteristics of targets. In this title, professionals will find detailed descriptions of the physics and mathematics of the Doppler and micro-Doppler effect. The book provides a wide range of clear examples, including an oscillating pendulum, a spinning and precession heavy top, rotating rotor blades of a helicopter, rotating wind-turbine blades, a person walking with swinging arms and legs, a flying bird, and movements of quadruped animals.
The Micro-Doppler Effect in Radar, Second Edition
Written by a prominent expert in the field, this updated and expanded second edition of an Artech House classic includes the most recent breakthroughs in vital sign and gender recognition via micro-radar, as well as covering basic principles of Doppler effect and micro-Doppler effect and describing basic applications of micro-Doppler signatures in radar. The book presents detailed procedures about how to generate and analyze micro-Doppler signatures from radar signals. Readers will learn how to model and animate an object (such as human, spinning top, rotating rotor blades) with movement, simulation of radar returns from the object, and generating micro-Doppler signature. The book includes c...
A New Doppler Effect
The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842 in Prague, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession. The relative changes in frequency can be explained as follows. When the source of the waves is moving toward the observer, each successive wave crest is emitted from a position closer to the obser...
Moving the Stars
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Physics, Pharmacology and Physiology for Anaesthetists
A quick reference to basic science for anaesthetists, containing all the key information needed for FRCA exams.
The Twin-effect and the Red-shift
The asymptotic relationship between twin-effect and acceleration red-shift is discussed from a point of view of theory and experiment. The paradoxical aspects of the twin effect can be reduced to two major factors: (1) the detour paradox, which means that the world-line geodesic within the light cone gives a maximum path - hence detouring saves proper-time; (2) the assumption that proper-time is a characteristic measure for biological aging. A number of physical aging phenomena are then reviewed. Accepting the physical reality of the twin-effect of proper-time, one can then delineate two contributions to this effect: (1) the kinematical effect associated with uniform translational motion, and (2) the acceleration effect related to the red-shift. The measurement of the acceleration red-shift by Hay et al (1960) may be considered as an unambiguous confirmation of the twin-effect in which primarily the red-shift contributes. No comparable check on the kinematical component is as yet available. In fact, experimentally it is not feasible to isolate the latter contribution. (Author).
