The doppler effect or the doppler shift is the change in frequency of a wave in relation to an. When, in addition to the constant doppler frequency shift induced by the bulk motion of a radar target, the target or any structure on the target undergoes micromotion dynamics, such as mechanical vibrations or rotations, the micromotion dynamics induce doppler. S is the vector of the n microdoppler features within. The doppler effect is the change in frequency wavelength of a wave detected by an. Microdoppler radar signatures for intelligent target. The modulation due to this vibration or rotation is referred to as the microdoppler md phenomenon. Microdoppler characteristics of radar targets 1st edition elsevier. Chen naval research laboratory fayin li shenshyang ho harry wechsler, fellow, ieee george mason university when, in addition to the constant doppler frequency shift induced by the bulk motion of a radar target, the target or any. Purchase microdoppler characteristics of radar targets 1st edition. Figure 4 can help illustrate how the radar can combine range and doppler returns. Radar echo, doppler effect and radar detection in the. In this report, the md effect is introduced and the mathematics of microdoppler signatures, induced by simple sinusoidal vibrations or rotations, is developed. Analysis of radar microdoppler signatures from experimental. The doppler frequency shift can be calculated as follows.
Microdoppler effect in linear frequency modulation signal radar. Pulsed doppler radar systems use pulse compression waveforms such as pseudonoise. Fourier independent component analysis of radar microdoppler. Doppler effect school of physics university of sydney. Radar microdoppler signatures of drones and birds at kband and wband. Phenomenon, model, and simulation study article pdf available in ieee transactions on aerospace and electronic systems 421.
The doppler frequency shift is determined by the wavelength of the electromagnetic wave and the relative velocity between the radar and the target. Mechanical vibration or rotation of a target or structures on the target may induce additional frequency modulations on the returned radar signal which generate sidebands about the targets doppler frequency, called the microdoppler effect. Principles of velocity measurement by the doppler effect. The doppler effect is used in some types of radar, to measure the velocity of detected.
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