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Phase-Array Radar and Synthetic-Aperture Radar (SAR) - Research Paper Example


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Phase-Array Radar and Synthetic-Aperture Radar (SAR)

The use of phased array can be made in radar applications for airborne fighter or attack radar applications. This is particularly possible through phased array radar that can be electronically steered (Skolnik, 2003, p.649). The concept behind phased array radar is that it makes use of the signal phases through its electronic controls. The phases are obtained at specific components of the array leading to generation of constructive interference in a path that is preferred for the positioning of the beams. Mechanical activities are not required in the process. Depending on each individual pulse, the radar beam can be steered, the time interval of such steering generally being 0.001s. The steering can be obtained in any desirable direction and in different angles. The flexibility of the beam steering is unlike other mechanical radars thus making the phased array radars unique and different from others. The stress generated on the pedestals, motors, and other parts of the radar can be reduced through methodical scanning of the radars following an uninterrupted model (Committee on the Evaluation of the Multifunction Phased Array Radar Planning Process, 2008, p.19). Synthetic-Aperture Radar: Synthetic aperture radar is a particular form of implementing the system of imaging radar. This system makes use of the platform of the radar and the processing of signals is made specific leading to generation of images that are of high resolution. In this system the resolution along the tracks of the radar

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beams are enhanced with the use of Doppler frequency analysis of signals that are obtained from radar coherently travelling along the track. The primary concept of the synthetic aperture radar is that with the use of this radar system, the signals get integrated from the area of the scatter of the signals till the moment the scatterer stays along the beam antenna (Zyl, 2011). The working of the synthetic aperture radar can be represented through the following figure (ASAR Image Orthorectification, 2013): The angular measurement of azimuth is involved in this system. Depending on the measurement of the traces along the azimuth angle, the clarity of the resolution would be obtained. The narrower the width, the finer would be the resolution. The width of the footprint can be determined by the following equation (Noorizadeh, 2010): ?ra ? R?B = R?/D Where, ra represents the resolution obtained from the real aperture of the antenna, D. R represents the series between the midpoint of the trail and the antenna, and ? is the wavelength of the frequency of the signal that has been transmitted (Noorizadeh, 2010). Synthetic aperture radar systems make use of advanced processes of digital signaling in order to take advantage of the movements that are ahead of the platform. This allows synthesizing a large aperture for the antenna thereby increasing the resolution of the range. However the antenna apertures do not increase in sizes that can be considered as unrealistic, thus benefitting the process of imagery through the use of synthetic aperture radars (Noorizadeh, 2010). Synthetic aperture radars can be used on oceans for tracking illegal or accidental spills that are done by men, for wave forecasting, and monitoring of the levels of ice. On the land, the system can be used for passing through cloud covers and


Phase-Array Radar and Synthetic-Aperture Radar Name University Name Phase-Array Radar: Phased array radar represents a directive antenna that is either formed of individual radiation antennas, or formed by constituents that generate such form of radiation, the nature and route of which are obtained by the relative stages and amplitudes of the currents reflected at the particular components…
Author : holly54
Phase-Array Radar and Synthetic-Aperture Radar (SAR) essay example
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