The actual phase shifts of the echo signals are compared with one another from at least two pulse …
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using a pulse radar, its most interesting and widespread use has been in identifying small moving targets in the presence of large clutter. As the radial component of a target's velocity approaches zero, the target will fall into the clutter or Any target with a velocity less than this minimum (MDV) cannot be detected because there is not sufficient Doppler shift in its echo to separate it from the mainlobe clutter return. A secondary influence is that phase rotation is induced by Doppler, and that creates blind velocities. 3, May … Fixed-target echoes or clutter are included within the same radar pulse-packet as the target, but the signals from fixed targets are not shifted in frequency.
Whereas, the blocks corresponding to the transmitter section may differ in both the block diagrams.As shown in the figure, MTI Radar uses the single Antenna for both transmission and reception of signals with the help of Duplexer.
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This echo signal is the desired one.
The earth's curvature and screening from terrain, foliage, and buildings cause system altitude to be another key factor determining depth of coverage. 3116 0 obj
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Leroy C. Perkins, et al., “The Development of Airborne Pulse Doppler Radar,” IEEE Transactions on Aerospace and Electronic Systems, vol AES-20, no.
Thus, …
�30Д HF�@e�rn���Gw�:�"�z(�1x}��hhb}��"�XF>~��� Therefore, the phase of Coherent Oscillator output will be So, the output of Coherent Oscillator can be used as reference signal for comparing the received echo signal with the corresponding transmitted signal using The above tasks will be repeated for every newly transmitted signal. However, in practical applications, Radar receives the echo signals due to stationary objects in addition to the echo signal due to that movable target.The echo signals due to stationary objects (places) such as land and sea are called For this purpose, Radar uses the principle of Doppler Effect for distinguishing the non-stationary targets from stationary objects. %%EOF
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The target location accuracy is proportional to the slant range, frequency and aperture length. In MTI radars, the Doppler shift in frequency is used to discern moving targets even when the echo signal from fixed targets is orders of magnitude greater.
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The MDV comes from the frequency spread of the mainlobe clutter. �Ň��H%Ī�������-���k���x��C�Z���-e��������~�J��M^\�t����[
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Location accuracy is a dependent on the certainty of the position of the radar, the radar-pointing accuracy, azimuth resolution, and range resolution.
Target range resolution determines whether two or more targets moving in close proximity will be detected as individual targets. For this purpose, Radar uses the principle of Doppler Effect for distinguishing the non-stationary targets from stationary objects.
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