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Back to Radar Courses.

Back to Radar Courses 7. Radar principles Radar sensors are usually divided into two groups according to their modes of operation.

Active sensors are those that provide their own illumination and therefore contain a transmitter and a receiver, while passive sensors are simply receivers that measure the radiation emanating from the scene under observation. The basic principle of a radar is transmission and reception of pulses. Short radra high energy pulses are emitted and couts returning echoes recorded, providing information on: This animation presents the basic elements of an imaging radar system. The two types of imaging radars most commonly used are: Both Real Aperture and Synthetic Aperture Radar are side-looking systems with an illumination direction usually perpendicular to the flight line.


The difference lies in the resolution of the along-track, or azimuth direction.

Radar course – understand and operate your radar set | Coastguard Boating Education

Real Aperture Radars have azimuth resolution determined by the antenna beamwidth, so that it is proportional to the distance between the radar and tldtectin target slant-range. Synthetic Aperture Radar uses signal processing to synthesise an aperture that is hundreds of times longer than the actual antenna by operating on a sequence of signals recorded in the system memory.

These systems have azimuth resolution along-track resolution that is independent of the distance between the antenna and the target.

The nominal azimuth resolution for a SAR is half of the real antenna size, although coues resolution may be selected so that other aspects of image quality may be improved. Generally, depending on the processing, resolutions achieved are of the order of metres for airborne radars and metres for spaceborne radars.


Radar Course 2 chapters. Independence of solar illumination Independence of cloud coverage Control of emitted electromagnetic radiation Control of imaging geometry Access to different parameters compared to optical systems Access to information about subsurface features Radar principles Real Aperture Radar RAR Real Aperture Radar: Range resolution Real Aperture Radar: Document library Search documents Latest documents. Events Upcoming events Radwr events Events catalogue.

Software and tools Software tools. Radar Course 2 Back to Radar Courses 7. Radar sensors are usually divided into two groups according to their modes of operation.