Read e-book online Airborne Doppler Radar PDF

By M. Schetzen

ISBN-10: 1563478285

ISBN-13: 9781563478284

ISBN-10: 1615830790

ISBN-13: 9781615830794

The publication starts with a uncomplicated dialogue of the Doppler impact and its quite a few purposes, and the way Doppler radar can be utilized for the stabilization and navigation of airplane. A quasi-static approximation of the Doppler spectrum is gifted besides illustrations and discussions to assist the reader achieve an intuitive realizing of the approximation and its boundaries. A precis of the mathematical options required for improvement of a precise concept is then awarded utilizing the case of a slender beam antenna. this can be by means of the advance of the precise thought for the final case, that is graphically illustrated and in comparison with the quasi-static approximation. normal stipulations for which the quasi-static approximation mistakes will be over the top – particularly as utilized to laser Doppler radars and low-flying airplane – are presented.
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6) the normalized frequency assigned to the beam center thus is 2 sin ue cos ua cycles. 3 is a graph of the normalized quasi-static Doppler frequency versus the elevation angle ue for the azimuth angle ua ¼ 0, 25, 50, and 75 degrees. 4 is a graph of the normalized quasi-static Doppler frequency versus the azimuth angle ua for the elevation angle ue ¼ 5, 30, 55, and 80 degrees. For both graphs, the antenna pattern has a circular cross section with s1 ¼ s2 ¼ 1 degree. Observe that indeed dqs % d(ue , 0).

Note that the Lambert law simply assumes that the backscatter is proportional to the projected 44 AIRBORNE DOPPLER RADAR Fig. 2 Level curve of the antenna pattern cross section. has a length proportional to s1. The length of the other elliptical axis is proportional to s2. 3. Before running the program, you should read Chapter 10, which includes a description of the computer program and its use; also, a copy of the program is included at the end of this text. For computational efficiency, Cþþ is used for the numerical computations; the numerical results are then used by MatLab to produce the graphs.

It has, however, been used in many other important applications. The biomedical area is one of the important areas of its application. For example, in medicine it is being used in ultrasonic imaging for the determination of the flow of bodily fluids such as blood in the carotid arteries, aorta, heart, and leg veins. With Doppler sonography, one also can determine whether blood vessels sewn together during surgery are functioning properly as, for example, a bypass to an oxygen-starved area of the brain.

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Airborne Doppler Radar by M. Schetzen


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