Site selection for a radio astronomy observatory in Turkey: atmospherical, meteorological, and radio frequency analyses

Küçük, İbrahim; Üler, İpek; Öz, Şükriye; Onay, Sedat; Özdemir, Ali Rıza; Gulsen, Mehmet; Sarıkaya, Mikail; Dağtekin, N. D.; Özeren, Ferhat Fikri

doi:10.1007/s10686-011-9264-z

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…-Even though their wavelength and their target were different, we confirm the results of Küçük et al (2012) that TURAG site (around YB-05 and YB-06) is well above the suitability of others for an optical observatory site. Table 3 are plotted for institutional sites (lowermost graph),…”

Section: Resultssupporting

confidence: 81%

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Astronomical site selection for Turkey using GIS techniques

et al. 2015

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A site selection of potential observatory locations in Turkey have been carried out by using Multi-Criteria Decision Analysis (MCDA) coupled with Geographical Information Systems (GIS) and satellite imagery which in turn reduced cost and time and increased the accuracy of the final outcome. The layers of cloud cover, digital elevation model, artificial lights, precipitable water vapor, aerosol optical thickness and wind speed were studied in the GIS system. In conclusion of MCDA, the most suitable regions were found to be located in a strip crossing from southwest to northeast including also a diverted region in southeast of Turkey. These regions are thus our prime candidate locations for future on-site testing. In addition to this major outcome, this study has also been applied to locations of major observatories sites.Since no goal is set for the best, the results of this study is limited with a list of positions. Therefore, the list has to be further confirmed with on-site tests. A national funding has been awarded to produce a prototype of an on-site test unit (to measure both astronomical and meteorological parameters) which might be used in this list of locations.

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Section: Resultssupporting

confidence: 81%

“…DAG (Dogu Anadolu Gözlemevi -East Anatolian Observatory). It has to be noted that even though site location of TURAG has been included Küçük et al, 2012 there are no institutional facilities established yet. However, in the scope of this work, it will be counted as an institutional site.…”

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confidence: 99%

Astronomical site selection for Turkey using GIS techniques

et al. 2015

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“…Thus, when observations on longer wavelengths, especially in infrared, are aimed then observers expect to have lower water vapor content in the atmosphere. This can be achieved if PWV measurements are involved in the selection process (Otarola et al 2019;Küçük et al 2012). For radio astronomy, RFI (Radio Frequency Interference) should also be included as a layer as well as PWV (Umar et al 2014).…”

Section: Site Selectionmentioning

confidence: 99%

Global Site Selection for Astronomy

Aksaker

Yerli

Erdoğan

et al. 2020

Monthly Notices of the Royal Astronomical Society

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A global site selection for astronomy was performed with 1 km spatial resolution (∼ 1 Giga pixel in size) using long term and up-to-date datasets to classify the entire terrestrial surface on the Earth. Satellite instruments are used to get the following datasets of Geographical Information System (GIS) layers: Cloud Coverage, Digital Elevation Model, Artificial Light, Precipitable Water Vapor, Aerosol Optical Depth, Wind Speed and Land Use -Land Cover. A Multi Criteria Decision Analysis (MCDA) technique is applied to these datasets creating four different series where each layer will have a specific weight. We introduce for the first time a "Suitability Index for Astronomical Sites" namely, SIAS. This index can be used to find suitable locations and to compare different sites or observatories. Mid-western Andes in South America and Tibetan Plateau in west China were found to be the best in all SIAS Series. Considering all the series, less than 3 % of all terrestrial surfaces are found to be the best regions to establish an astronomical observatory. In addition to this, only approximately 10 % of all current observatories are located in good locations in all SIAS series. Amateurs, institutions or countries aiming to construct an observatory could create a short-list of potential site locations using layout of SIAS values for each country without spending time and budget. The outcomes and datasets of this study has been made available through a web site, namely "Astro GIS Database" on www.astrogis.org.

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“…Taking an L-band SAR as an example, it may be affected by devices working in the same or adjacent frequency bands such as television, radio and communication equipment [6], radio navigation systems, early warning radars, wind profile radars, etc. [7][8][9]. Moreover, devices working in different frequency bands may also cause interference through harmonics [10].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of RFI Impacts on Imaging between Geosynchronous SAR and Low Earth Orbit SAR

Dong

Sui

et al. 2022

Remote Sensing

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Due to the short revisit time and large coverage of Geosynchronous synthetic aperture radars (GEO SARs) and the increasing number of low earth orbit synthetic aperture radar (LEO SAR) constellations, radio frequency interference (RFI) between GEO SARs and LEO SARs may occur, deteriorating the quality of SAR images. Traditional methods only simplify RFI to noise-like interference without considering the signal characteristics. In this paper, to accurately evaluate the impacts of GEO-to-LEO RFI and LEO-to-GEO RFI on imaging quantitatively, an RFI-impact quantitative analysis model is established. Taking account of the chirp signal form of SAR systems, the RFI power and image Signal-to-Interference-plus-Noise Ratio (SINR) are theoretically deduced and validated by numerical experiments. Based on the proposed method, the SAR image quality under different system parameters and bistatic configurations is estimated, and the probability of different configurations is also given. The results show that specular bistatic scattering RFI between GEO SARs and LEO SARs has serious effects on imaging, and the probability can approach 2% for certain orbital parameters and will become higher as LEO SAR constellations increase in the future, implying the necessity to suppress the RFI between the GEO SAR and the LEO SAR system.

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Site selection for a radio astronomy observatory in Turkey: atmospherical, meteorological, and radio frequency analyses

Cited by 9 publications

References 6 publications

Astronomical site selection for Turkey using GIS techniques

Astronomical site selection for Turkey using GIS techniques

Global Site Selection for Astronomy

Modeling and Analysis of RFI Impacts on Imaging between Geosynchronous SAR and Low Earth Orbit SAR

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