A Radiometric System for the РТФ-32 Radio Telescope

Ипатов, А. В.; Kol’tsov, N. E.; Krokhalev, A. V.

doi:10.1007/s10786-005-0084-0

Cited by 6 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ADC works with sample rate of 4096 MHz and 2 GHz input bandwidth. This allows to directly digitize signals of intermediate frequencies (IF) range coming from the receivers, which are either 100-1000 MHz for RT-32 receiving system [5] or 1-2 GHz for Tri-band [14] and ultrawideband [15] receivers of RT-13. The last modification of ultra-wideband receiver has 8 channels with IF range from 50 MHz to 2 GHz.…”

Section: Mdbe Hardware Design 21 Digital Signal Processing Unitmentioning

confidence: 99%

“…Until 2015, the network consisted of three 32-meter radio telescopes (RT-32) located in Svetloe, Zelenchukskaya and Badary observatories [2]. The backends of RT-32 include various devices for single-dish observations, mostly radiometric and spectral ones [3][4][5], and VLBI backend R1002M DAS [6], that supports 16 frequency channels with up to 32 MHz bandwidth each and the total output data rate of 2 Gbps. The R1002M DAS allows Quasar VLBI network stations to participate in international VLBI observations within the International VLBI Service (IVS) [7] and the European VLBI Network (EVN) [8], but neither the antenna nor the backend of RT-32 meet the requirements of the actively growing VLBI Global Observing System (VGOS), which is the new global VLBI infrastructure [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multifunctional Digital Backend for Quasar VLBI network

Nosov¹,

Marshalov²,

Fedotov³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

The new 13-meters radio telescope recently built at Svetloe observatory (Russia) required a backend device that could digitize wideband signals from the receiving system, process the signal appropriately, prepare and transmit the resulting signal to the recorder. The previously existing backends, also used at other radio telescopes of Quasar VLBI network, could not provide compatibility with VGOS (VLBI Global Observing System) requirements. We developed Multifunctional Digital Backend (MDBE) with superior performance, flexibility and functions to equip the new antenna and other radio telescopes of the network with the same backend compatible with both domestic and international systems. The MDBE contains up to 12 input channels with 2 GHz bandwidth, powerful and remotely configurable Field programmable gate arrays (FPGA) for digital signal processing, and optical transceivers with total throughput of 50 Gbps per channel. The digital downconverters implemented in FPGA can form sub channels with 0.5, 2, 4, 8, 16, and 32 MHz bandwidth freely tuned with 10 kHz step. In wideband mode a single channel with 512, 1024 or full 2048 MHz bandwidth can be recorded. The MDBE also supports single-dish applications, such as radiometric and spectrometric observations. The paper presents the results of hardware and firmware development of the system, and the experimental results received with the MDBE in Svetloe observatory.

show abstract

Section: Mdbe Hardware Design 21 Digital Signal Processing Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifunctional Digital Backend for Quasar VLBI network

Nosov¹,

Marshalov²,

Fedotov³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…An important feature of the focusing system is a slight deflection of the focal axis of the secondary mirror from the rotation axis of the quasi paraboloid of the principal mirror. Such an orientation scheme of the axes allows placement of the primary feeds of the RT [9,10] receivers on a circle with a diameter of ~3 m and provides prompt switch ing of the ranges of received signals via adjustment of the convergent mirror position [3].…”

Section: Purpose and Main Characteristics Of The Radio Telescope Antementioning

confidence: 99%

The RT-32 radio telescope pointing system

et al. 2012

View full text Add to dashboard Cite

The new generation multiwave high precision radio telescope (RT) with a 32 m diameter mirror was developed and manufactured within the framework of the project of creating the national Quasar KVO radiointerferometric network [1][2][3][4]. To date, three RTs have been built and actively operate at the Svetloe (Leningrad oblast), Zelenchuk (North Caucasus), and Badary (near lake Baikal) observatories. The RT of the Badary observatory is shown in Fig. 1.The RT is intended for fundamental investigations of celestial objects of different natures within wave length ranges from 1.35 to 21.00 cm [5][6][7][8]. The main element of the RT is the reflector antenna system (AS). The AS was built according to the modified Cas segrain scheme with a quasi parabolic principal mir ror and quasi hyperbolic secondary mirror (conver gent mirror) 4 m in diameter. An important feature of the focusing system is a slight deflection of the focal axis of the secondary mirror from the rotation axis of the quasi paraboloid of the principal mirror. Such an orientation scheme of the axes allows placement of the primary feeds of the RT [9, 10] receivers on a circle with a diameter of ~3 m and provides prompt switch ing of the ranges of received signals via adjustment of the convergent mirror position [3].The rotary support of the AS provides azimuthal and elevation angle rotations. The electrical drive of the principal mirror provides azimuthal and elevation angle displacements of the AS within angles of ±270°a nd 0°-90°, respectively.The AS azimuthal movement is performed along a 40 m diameter circular rail track. The azimuthal drive consists of four paired carriages, each of which is equipped with two pairs of dc motors with different powers.The large weight of the RT 32 structure (>600 t) and the requirements imposed on the dynamic char acteristics of the RT movement determine the param eters of the AS electrical drive and control system.The electrical drive provides high speed displace ments along the azimuthal (up to 1.5 deg/s) and eleva tion angle (up to 1 deg/s) coordinates with accelera tions of up to 0.8 deg/s 2 at the speed up stage [3]. In this case, the AS control system must control the RT movement dynamics so as to ensure the required accu racy, absence of vibrations, and a dynamic but smooth acceleration and deceleration. Impact loads on the RT structure must be excluded. When nonstandard situa tions arise, the safe RT stoppage must be provided.The electrical drive of the AS operates in two modes. The AS is displaced to a specified region using more powerful high speed motors for a maximally rapid change in the orientation of the antenna princi pal mirror upon a change to the next object under observation. The source tracking mode is provided by low speed motors that are enabled after the AS reaches the rated vicinity of the radio source coordi APPLICATION OF COMPUTERS IN EXPERIMENTSAbstract-Quasar-KVO RT 32 radio telescopes of the radio interferometric complex of the Russian Acad emy of Sciences are equipped with unique 32 m diam...

show abstract

Spectral-Selective Radiometer Unit with Radio-Interference Protection

Grenkov

Kol’tsov²

2015

Radiophys Quantum El

View full text Add to dashboard Cite

A Radiometric System for the РТФ-32 Radio Telescope

Cited by 6 publications

References 0 publications

Multifunctional Digital Backend for Quasar VLBI network

Multifunctional Digital Backend for Quasar VLBI network

The RT-32 radio telescope pointing system

Spectral-Selective Radiometer Unit with Radio-Interference Protection

Contact Info

Product

Resources

About