Published 1992 by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in EnglishRead online
The performance of a phased array antenna depends upon the phase and amplitude distribution across the aperture. A continuous 13-near phase distribution is required for an efficient focussed beam, but practical phase shifters are digital devices and can only provide an approximation to a linear phase distribution. Consequently some type of roundoff criteria must be established. The method of roundoff affects the radiation pattern characteristics such as beam location and sidelobe level. Accurate target tracking requires that a radar have a small beam pointing error. Low sidelobes are also desirable to prevent jamming and the illumination of clutter. Therefore the goal was to select a roundoff criterion that provides a phase distribution across the aperture to minimize both the beam shift and the sidelobe levels, while simultaneously maximizing the gain. The methods examined are referred to regular roundoff, weighted random roundoff, running sum roundoff and symmetric running sum roundoff. The first two are in common use, but the third and fourth are new methods examined in this paper. It was demonstrated that the latter two have the beam shift of the four roundoff methods, without significantly degrading the other pattern properties. roundoff; beam shift; phase shifters; bitsize; pointing error; null depth: sidelobe.
|Statement||Stanley E. Engle|
|The Physical Object|
|Pagination||142 p. ;|
|Number of Pages||142|
Download Roundoff algorithms for digital phase shifters that minimize beam shift
Ferrite phase shifters continue to be the workhorse in military- phased arrays, and while there have been advances in thin film ferrite devices, the review of this device technology in the previous edition of this book. The general theory of phase shifting algorithms M.
Servin 1,*, J. Estrada 1, and J. Quiroga 2 1 Centro de Investigaciones en Óptica A. C., Lom a del BosqueCol. Lomas del Campestre. Idealized Radar GMTI Detection with Space-Time Processing Roundoff algorithms for digital phase shifters that minimize beam shift of the four roundoff methods, have the beam shift without.
phase of a signal. If we think of a single tone as having an amplitude and phase then we can depict the signal on a polar diagram as in figure 4. Two signals with equal amplitude and a 90 degree phase File Size: KB. L3 Narda-MITEQ designs and manufactures a standard line of high quality Phase Shifters.
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Digital Phase Shifters MHz frequency range Up to a full octave bandwidth Degrees phase shift Integral TTL driver bit control Accuracy to 1⁄ 2 least significant bit Time shifter or frequency. algorithms, pattern degradation does occur. Most notably, the directivity can be severely lowered.
Another treatment is to employ subarrays as in . In this approach, a single phase shifter is used to feed Cited by: 3. achieving this goal is to deploy beamforming at both the digital and analog domains, i.e., hybrid beamforming (HB).
In the digital domain, beamforming can be realized at the baseband frequency File Size: KB. Semiconductor and Delay Line Phase Shifters (ARTECH HOUSE ANTENNAS AND PROPAGATION LIBRARY) [Koul, Shiban K., Bhat, Barathi, Bhat, Barathi] on *FREE* shipping on Cited by: 4.
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Phase shifters are used in phased arrays. 1 Classification. Active versus passive. The PS RF Phase Shifter from DS Instruments provides handheld stand-alone and remote-controlled phase shifting from 0 to degrees in degree increments.
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Distributed Micro Electromechanical systems Transmission Line (DMTL) is used for designing digital phase shifters, by using an array of shunt switches. In the present paper, a new Cited by: 1. 3 Where ϕˆ(,)x y is the estimated phase which may differ a bit from the true modulating phaseϕ(,)x that the PSA in Eq.
(3) has a linear non-tunable PSA, multiplied by the tangent of ω0(,)/. 3. Multi-step phase-shifting algorithms insensitive to linear phase shift errors.
Almost all the existing phase-shifting algorithms are based on the assumption that the phase-shift at all pixels of Cited by: A digital fringe projection and phase-shifting algorithm is able to control the phase shift and the wavelength accurately because of its digital fringe generation nature.
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Over the past few decades, many PSP algorithms have been proposed or extended from the field of PSI, for example, standard N-step phase shifting algorithm, double 3-step algorithm, Hariharan 5-step Cited by: We have been reporting several new techniques of analysis and synthesis applied to Phase Shifting Interferometry (PSI).
These works are based upon the Frequency Transfer Function (FTF) and how. In a shift left, it can be tested for significance so that the results of a left shift can be evaluated for validity.
The bits shifted out are available from the AND gates at the extreme left and right of the circuit. Figure File Size: 38KB. MATLAB for the phase shift calculation of DTML.
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Several technologies have been used to develop phase shifters at mm-wave for the consumer market, including CMOS, BiCMOS, BST, Liquid Cited by: 1. A self-calibrating phase-shifting algorithm based on the natural demodulation of two-dimensional fringe patterns Kieran G.
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Gonzalez, 1. Servin, 1,* J. Estrada, 1. and J. Quiroga. Centro de File Size: KB. shifters can achieve a large amount of phase shift and high speed and require fewer diodes than digital phase shifters, but at the cost of decreased accuracy, relatively narrow bandwidth, and low input.
Superfast phase-shifting method for 3-D shape measurement niques based on digital fringe projection and phase-shifting methods have improved drastically.
A variety of phase-shifting algorithms have. It has been widely believed that phased array antenna should use at least 3-bit (as phase controlling bit) phase shifter to provide the satisfactory scanning capability and the unnoticeable Cited by: 9.
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