A megawatt power millimeter-wave phased-array radar

Tolkachev, A. A.; Levitan, B. A.; Solovjev, G.K.; Veytsel, V.V.; Farber, V. E.

doi:10.1109/62.854021

Cited by 58 publications

(23 citation statements)

References 1 publication

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“…In the amplifier case, a master oscillator drives a large number of powerful amplifiers (MOPA) and low-power phase shifters before each amplifier control beam direction, i.e., pointing is done by a customized phase-shifting signal input to each module. Some mechanical pointing of the dishes can also be used to track the rising craft [11]. The MOPA approach is more likely to be used.…”

Section: Launch To Orbitmentioning

confidence: 99%

Space Applications of High-Power Microwaves

Benford¹

2008

IEEE Trans. Plasma Sci.

128

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Schemes have been suggested for transferring energy from Earth-to-space, space-to-Earth, and space-to-space using high-power microwave (HPM) beams. All use power beaming. Microwave beams have been studied for propelling spacecraft for launch to orbit, orbit raising, launch from orbit into interplanetary and interstellar space, and deployment of large space structures. The microwave thermal rocket, called the "microwave thermal thruster," is a reusable single-stage vehicle that uses an HPM beam to provide power to a heat-exchanger propulsion system, with double the specific impulse of conventional rockets. Orbital missions include orbit raising and space solar power. Microwave-propelled sails are a new class of spacecraft that promises to revolutionize future space probes. Experiments and simulations have verified that sails riding beams can be stable on the beam for conical sail shapes. Beam-driven sail flights have now demonstrated the basic features of the beam-driven propulsion. Beams can also carry angular momentum and communicate it to a sail to help control it in flight. An early mission for microwave space propulsion is dramatically shortening the time needed for sails to escape Earth's orbit. A number of missions for beamdriven sails have been quantified for high-velocity mapping of the outer solar system, Kuiper Belt, the Heliopause, and the penultimate interstellar precursor mission. For large HPM systems at fixed effective isotropic radiated power, minimum capital cost is achieved when the cost is equally divided between antenna gain and radiated power. This is a driver when considering design of power-beaming systems such as interstellar Beacons, which the Search for Extraterrestrial Intelligence is searching for. Much of the technical means for these applications are already in hand. Microwave and millimeter-wave array antennas are already in use for astronomy; sources at high frequencies are being developed for fusion and the military. Development of high-power arrays is needed. A synergistic way to develop a space power-beaming infrastructure is incremental buildup, addressing lower power applications first, and then upgrading.Index Terms-Microwave antenna arrays, microwave oscillators, microwave power amplifiers, microwave power transmission, Search for Extraterrestrial Intelligence (SETI), space solar power (SSP), space-vehicle propulsion.

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Section: Launch To Orbitmentioning

confidence: 99%

Space Applications of High-Power Microwaves

Benford¹

2008

IEEE Trans. Plasma Sci.

128

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“…It operated at a frequency of 10 GHz that corresponded to the frequency of the main cyclotron resonance in the field of a solenoid cooled with flowing water. In subsequent years, gyroklystrons installed in cryomagnets [4,5] were developed for millimeterwave radar stations "RUZA" [2] and "WARLOC" [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of a gyroklystron operating in the field of a permanent magnet

Antakov

Gachev

Zasypkin

2011

Radiophys Quantum El

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621.385.69We have developed and tested a gyroklystron operating with the second harmonic of the electron cyclotron frequency at a frequency of 32.3 GHz in the field of a permanent magnet. In the twoand three-cavity versions of the gyroklystron, the peak power of the output radiation reached 320 kW with an efficiency of 30%, an amplification coefficient of 20-25 dB, and an operating frequency bandwidth of 0.05%. In the wide-band version of the gyroklystron, the amplification bandwidth was equal to 0.27% for an output power of 200 kW and an amplification coefficient of 13 dB.

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“…The principle of locating detection is: Firstly, use array sensor arranged by multiple sensors array elements which have certain space distribution characteristics to receive broadband ultrasonic signals which produced by the partial discharge source in the electrical equipment and which the center frequency is about 150 kHz, effective bandwidth is between 50 kHz and 300 kHz [6][7]; Secondly, process the acquisition of the broadband array signal with Rotation Signal Subspace algorithm [8][9][10] to maximum keep the original signal's broadband airspace information, to accomplish the accumulation of broadband signal's locating information, so as to change the broadband signals to the narrow-bandwidth signals by focusing; Thirdly, the narrowbandwidth signals, azimuth and elevation to the position of array sensors can be acquired through DOA estimation and MUSIC algorithm [11][12][13][14][15]. Finally, turn the azimuth and elevation of partial discharge source into bearing lines of the measuring platform.…”

Section: Introductionmentioning

confidence: 99%

The Partial Discharge Locating Experimental Study in Transformer Based on Ultrasonic Phased Array

Wang

Xie

Cai

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Partial discharge locating detection is a key project in transformer insulation mechanism research and quality control. And it is an important foundation in transformer's condition maintenance. The theory of partial discharge location based on ultrasonic array is an effective improvement of partial discharge locating. But in experimental studies, the problem of sensor array element coupling performance is inconsistent, the results of many cross-point locations are also different, and the success rate and the locating accuracy in double-platform locating are not better than imagined. Based on these problems, three practical methods and techniques are presented in this paper. Firstly the pencil test method is used to test the coupling performance of the elements of the array sensor to improve the success rate of localization; secondly, taking repeated measurements at the same place and the weighted average method to improve the accuracy of measuring; thirdly the multi-platform and global search method are used to improve the positioning accuracy of PD source locating. Finally, the locating experimental system is established based on the ultrasonic phased array in oil. The Experimental results show that the locating errors is less than 10cm, verifies the three methods can effectively improve the partial discharge array ultrasound locating success rate and locating accuracy.

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A megawatt power millimeter-wave phased-array radar

Abstract: This article describes the design and development of a multi-megawatt radar "Ruza," having a large mechanically steered, millimeter-wave, , phased-array antenna.

Cited by 58 publications

References 1 publication

Space Applications of High-Power Microwaves

Space Applications of High-Power Microwaves

Experimental studies of a gyroklystron operating in the field of a permanent magnet

The Partial Discharge Locating Experimental Study in Transformer Based on Ultrasonic Phased Array

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