azimuth resolution


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azimuth resolution

[′az·ə·məth ‚rez·ə′lü·shən]
(electromagnetism)
Angle or distance by which two targets must be separated in azimuth to be distinguished by a radar set, when the targets are at the same range.

azimuth resolution

azimuth resolutionclick for a larger image
azimuth resolution
The ability of radar equipment to separate two reflectors at similar ranges but different bearings from a reference point.
In the first figure, the distant objects subtend a very small angle and they appear as one big blip or target on radar screen. In the second figure, however, the two aircraft are far enough apart in azimuth to be seen as two spots on the screen.
Targets a, b can be discriminated by narrower beam, whereas targets c and d tend to merge and appear as one target. Normally, the minimum separation distance between the reflectors is quoted and expressed as the angle subtended by the reflectors at the reference point.
References in periodicals archive ?
In this paper, the azimuth resolution degradation (defocusing) is analyzed since this effect is more important than the problem of the side lobes for the multi-look processing, especially for airborne SAR systems [5,6,21].
2, the Doppler bandwidth needed for MEOSAR can be less than LEOSAR for a given azimuth resolution.
Currently spotlight SAR can get high azimuth resolution under 1 m.
The Doppler bandwidth is near 3600 Hz with a corresponding azimuth resolution of 2.
As a result, in TOPS, the obtained azimuth resolution in the near range is greater than in the far range.
However, limited by the azimuth resolution of subaperture images, N is generally small.
Therefore the azimuth resolution of spotlight SAR can be approximatively written as [rho] ~ [alpha]L/2.
Battlefield surveillance radars are characterized by side looking high azimuth resolution antennas and narrow pulse widths to obtain relatively high resolution cell sizes.
Consequently, the illumination time of targets is augmented, and a finer azimuth resolution can be achieved.
He shows how the radar's azimuth resolution can be increased greatly by moving a real antenna in relation to the target, painting stripes of resolution cells.
Spotlight synthetic aperture radar (SAR) is a remote sensing instrument providing the opportunity to collect data over a wide azimuth angular interval with the potential for extremely high azimuth resolution [1-3].
The steering of the antenna results in a longer synthetic time and aperture than the stripmap mode, which provides the probability of a finer azimuth resolution than the ideal azimuth resolution gotten in stripmap mode.