Sideband Doppler modulation caused by micro motion of targets on radar echoes is called micro-Doppler effect. Vibration, swing, rotation, coning, precession and nutation are the most common kinds of micro motion. In this paper, micro-Doppler is induced by coning motion mathematically. Then echoes of point scatterers are modelled with linear frequency modulation (LFM) signal. This paper mainly studies the performance of micro-Doppler extracted from echoes of targets with translation compensated completely under different bandwidth. It is more beneficial to extract micro-Doppler characteristics of each scatterer respectively as the bandwidth grows wider, when different scatterers can be separated in range profile domain. At last, the analysis of performance is verified by simulation.
The micro-motion of radar targets commonly mixes with bulk translation. In order to extract the micro-Doppler signature of moving targets during a long observation time, it is necessary to perform coherent preprocessing on the echo to compensate the bulk translation. This paper first derives the narrowband echo model for high-speed targets with precession and gives a coherent preprocessing algorithm based on the echo model. Then the micro-Doppler signature is analyzed by joint time frequency transform and the micro-motion period is estimated by a method based on inverse radon transform. Finally, the proposed algorithm is verified with the simulation echo of a cone with precession.
In order to improve the measurement capacity of fullpolarization radars, and take advantage of the target polarization information effectively, it is necessary to design suitable transmitting waveform to meet the requirement of full-polarization measurement. In this paper, a novel waveform design method is proposed. Greedy algorithm is used to optimize the phase-coded waveform design. The factors relative to auto-correlation and orthogonality performance are combined with the factor of Doppler tolerance in the cost function, and different phase-modulated waveforms could be designed to meet different requirement by adjusting their weights. Simulation results demonstrate the validity of this method. (4 pages)
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