astronomy

Giant Ukrainian Radio Telescope

Giant Ukrainian Radio Telescope is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Giant Ukrainian Radio Telescope rather than just read about it. In short: Giant Ukrainian Radio Telescope (GURT, Ukrainian: Гігантський Український Радіотелескоп, ГУРТ) is a low frequency (8-80 MНz) radio telescope which is being developed, built and operated by Institute of Radio Astronomy of National Academy of Sciences of Ukraine (IRA NASU). It is located at S.

Key takeaways

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Reference excerpt

Giant Ukrainian Radio Telescope (GURT, Ukrainian: Гігантський Український Радіотелескоп, ГУРТ) is a low frequency (8-80 MНz) radio telescope which is being developed, built and operated by Institute of Radio Astronomy of National Academy of Sciences of Ukraine (IRA NASU). It is located at S. Y. Braude radio astronomical observatory in Kharkiv oblast of Ukraine. The GURT system is designed to be an extension of Ukrainian T-shaped Radio telescope, second modification (UTR-2) in terms of spatial dimensions and frequency range. The goals of creating this new instrument include enhancement of UTR-2 functional properties and contribution to the progress of low frequency radio astronomy in synergy with other distant instruments.

System overview

GURT is a large phased array composed of identical subarrays consisting of 25 antenna elements. Subarrays are currently being added, with the finished array planned to incorporate 100 subarrays for a total of 2500 elements. The individual antenna element consists of two wideband dipoles of copper tubing at right angles to each other, at ±45° to the Earth's meridian, mounted 1.6 meters above the ground. The elements in a subarray are spaced 3.75 meters apart. The antenna elements of the two orthogonal polarizations are connected in separate identical phased arrays. The crossed dipoles are grouped into square 5×5 subarrays. The subarray design provides a wide frequency coverage from 8 to 80 MHz, high sensitivity (the galactic background level exceeds their self-noise by more than 7 dB), and high RFI immunity (achieved due to high dynamic range of the dipole amplifier: input IP3 is 30 dBm). The effective area at the central frequency is about 350 m2. The phase shift network inside a subarray is analogue, consisting of different lengths of coaxial cable delay line switched into the signal path, whereas the phasing between subarrays is planned to be digital. The beamwidth (HPBW) of a single subarray beam at 40 MHz is about 20.4°. The estimate is consistent with the direct measurements that give 22±2°. The GURT subarray geometry provides a high filling factor that is important for a number of research tasks. A powerful dedicated digital recorder for the GURT system has been developed at the IRA NASU. It is designed for spectral analysis of a band up to 80 MHz (at a sampling frequency of 160 MHz), with high spectral and temporal resolutions, high dynamic range and several operation modes including real time FFT, waveform recording, auto- and cross-correlation spectral measurements, addition and subtraction regime between the two input channels, normalization, and programmable signal delay.

Current status

Four GURT subarrays have already been installed, equipped, and are operational now. For now most of the time subarrays are used for radio astronomical observations separately because of limited resources for digital phasing system. It has been found that in spite of comparatively small effective area and sensitivity of the subarray it is possible to observe a number of important astrophysical phenomena in a wide frequency range (8–80 MHz). They have proven their ability to address many radio astronomical problems, e.g. for observations of solar bursts, Jovian Io-related decametric radiation, ionospheric scintillation, ground-based support for spacecraft missions, emission of pulsars, etc. The presence of large and well-studied UTR-2 at the same observatory opens vast opportunities in antenna testing in the shared frequency range. The sensitivity and other parameters of the GURT active antenna and subarray are studied using computer simulations and their results are verified with noise measurements.

Future prospects GURT, currently under construction, will consist of many (up to 100) identical subarrays. The available area of the S. Y. Braude observatory exceeds one square kilometer. Construction of new subarrays is successive, spanning over a period of time, as resources become available. With increase of number of subarrays and effective area the number of astrophysical problems to be solved by GURT will increase significantly. Joint simultaneous observations of radio astronomical sources with many instruments all over the world are very important at low frequencies due to many hindering factors. Various RFI conditions, different impact of ionosphere at the site of radio telescope, various configurations and parameters of distant radio telescopes increase significantly the informativity of received signals.

References

Illustrations

Worked examples

Example 1 — a first encounter with Giant Ukrainian Radio Telescope

Start with the simplest possible case. Write down what Giant Ukrainian Radio Telescope claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Giant Ukrainian Radio Telescope before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Giant Ukrainian Radio Telescope ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Giant Ukrainian Radio Telescope

In research: Giant Ukrainian Radio Telescope appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Giant Ukrainian Radio Telescope in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Giant Ukrainian Radio Telescope is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical observatories in Ukraine, Radio telescopes, so understanding it makes those chapters shorter.
In everyday life: Look for Giant Ukrainian Radio Telescope outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Giant Ukrainian Radio Telescope in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Giant Ukrainian Radio Telescope means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Giant Ukrainian Radio Telescope out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Giant Ukrainian Radio Telescope in simple terms?

Why does Giant Ukrainian Radio Telescope matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Giant Ukrainian Radio Telescope?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Giant Ukrainian Radio Telescope.