difference between slar and sar radar

A Synthetic Aperture Radar (SAR), or SAR, is a coherent mostly airborne or spaceborne sidelooking radar system which utilizes the flight path of the platform to simulate an extremely large antenna or aperture electronically, and that generates high-resolution remote sensing imagery. The scene matching between side-looking real aperture radar (SLAR) image and synthetic aperture radar (SAR) image is influenced by the terrain height variance because radar imaging in the direction of slanting range. Terms in common use that indicate directional look properties of radar are defined. SAR works by taking radar samples as the radar antenna is moving along a lineDue to the fact that SAR maps use radio waves instead of light waves to create images, detailed SAR maps can be taken at night or bad weather, when conventional optical or infrared cameras (EO/IR) cannot effectively operate. September 3, 2007 Lecture D1La1 Introduction to SAR remote sensing Thuy Le Toan From ‘ERS-1 : 500 days in orbit ’. The "Very Large Array" (VLA) near Socorro, New Mexico operates on this principle. Synthetic aperture radar (SAR) data are commonly used for lake ice monitoring, due to the acquisition of images in any condition (time of day or weather). The size of the ground resolution cell increases on the side of the nadir as the distance between radar platform and the ground resolution cell increases. SLAR can be fitted with a standard antenna (real aperture radar) or an antenna using synthetic aperture. Origin : difference of salinity between Atlantic Ocean and Mediterranean sea + tide effects Effect of surface roughness- Internal waves. Side-looking airborne radar (SLAR) is an aircraft- or satellite-mounted imaging radar pointing perpendicular to the direction of flight (hence side-looking). Synthetic Aperture Radar (SAR) is used to acquire higher resolution. In a focused SAR image these phase errors can be compensated for by applying a phase correction to the return signal at each synthetic aperture element. Synthetic Aperture Radar (SAR) To solve this problem, synthetic aperture radars (SAR) have been developed to mimic the effect of a very large antenna, while maintaining physical integrity and size limits. Advanced Photonics Journal of Applied Remote Sensing The difference between a SLAR and a SAR type radar is clarified. Synthetic Aperture Radar. SYNTHETIC APERTURE RADAR (SAR) SUMMARY Range Resolution (end view) q - look angle H - spacecraft height B - bandwidth of radar t - pulse length 1/B C - speed of light Note the range resolution is infinite for vertical look angle and improves as look angle is increased. The match algorithm investigated on this paper between real aperture radar image and SAR is based on normalize cross correlation match. Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes.

A squinted (nonperpendicular) mode is possible also. Electromagnetic Theory Unlike optical and infrared imaging sensors which are inherently passive, meaning they rely on reflected or radiated energy, radar is an active sensor--providing its own illumination in the form of microwaves. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional beam-scanning radars. This means that the ground resolution cells are larger towards the edge of the image than near the middle. Two types of resolution are discussed and the importance of pulse intensities in interpreting returned radar signals is stated. CONFERENCE PROCEEDINGS Papers Presentations Journals. These range differences, or path length differences, of the radar signals can affect image quality.


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