Majid Mokhtarani (Translator)
Volume 7, Issue 26 , August 1998, , Pages 52-64
Abstract
One of the abilities of the S band (SAR sensor) in the “Almaz” Russian Satellite is observation of oceanic phenomena during its mission in 1991-1992.
The SAR Almaz-1 Satellite showed us different oceanic phenomena such as surface and middle (lower) waves of the oceans, the floor of ...
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One of the abilities of the S band (SAR sensor) in the “Almaz” Russian Satellite is observation of oceanic phenomena during its mission in 1991-1992.
The SAR Almaz-1 Satellite showed us different oceanic phenomena such as surface and middle (lower) waves of the oceans, the floor of oceans, rise of water surface, topography of depths of oceans, the effect of ship’s passage over water, pieces of ice flowing on seas, oil spots and various climatic phenomena. This paper is the result of the final examination of the Almaz-1 oceanographic mission and its practical assessments for study of oceans and their display. In this paper, examples of interpreted images have been presented.
Majid Mokhtarani (Translator)
Volume 6, Issue 24 , February 1997, , Pages 7-19
Abstract
Today, despite the emergence of precise surveying devices for ranging, including its more advanced type, namely GPS, the question still remains about the accuracy of such machines. Possibly accurate measurement is not necessary in many ordinary surveying works, but in fine works it is necessary that ...
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Today, despite the emergence of precise surveying devices for ranging, including its more advanced type, namely GPS, the question still remains about the accuracy of such machines. Possibly accurate measurement is not necessary in many ordinary surveying works, but in fine works it is necessary that the accuracy of spacer be controlled and determined. One of the most important surveying operations which needs great precision is microgeodesy. This operation has applications in measuring dams’ displacement, earth’s tectonic movements, landslides and even predicting earthquake and rise or fall of sea levels, installing an important piece in giant factories and measuring its movements, etc. In such operations, the spacer is used after determining its precision. Despite rapid advancement of GPS receivers in surveying operations, they are still not used singly in microgeodetic works, because their relative precision is not suitable for such operations, especially in short distances. Consequently it is used merely as a complementary. Electronic spacers have the highest precision in short and long distances. If we take a look at the precision of spacers in various distances, we notice that up to five kilometers the electronic spacers, especially those working based on two-color method are of high accuracy. From eight to thirty kilometers the single-frequency GPS systems, from thirty to eighty up to a hundred kilometers the two-frequency GPS systems, and in higher distances ranging by the SLR and V.L.B.I methods are of great precision.
Majid Mokhtarani (Translator)
Volume 4, Issue 16 , February 1995, , Pages 53-56
Abstract
The ERS-1 satellite prepares images through radar system and has been launched from Europe in June 1991. One of the important features of this satellite is that it has the ability to penetrate into clouds and to some extent pass through the rain. It is capable of shooting at night. Its waves have greater ...
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The ERS-1 satellite prepares images through radar system and has been launched from Europe in June 1991. One of the important features of this satellite is that it has the ability to penetrate into clouds and to some extent pass through the rain. It is capable of shooting at night. Its waves have greater ability of penetration into plants than light waves, because the extent of their penetration depends on the amount of moisture and density of the plant, and also in arid areas they have high power of penetration into the earth. The resolution of the images is 16 to 20 meters. The angle of view on the ground is 23 degrees and sweep the width of 100 kilometers on the ground. The applications of the ERS-1 radar images include the following: Investigation of regional phenomena; Hydrology; Identification of glaciers; Preparation of topographic maps; Geology; Meteorology; Examination of the Oceans and methods of wave imaging; Physical oceanography; Plant growth and produce estimation.
