Unambiguous Accuracy of an Interferometer Angle-Measuring System

Kendall, William B.

doi:10.1109/tset.1965.5009646

Cited by 27 publications

(9 citation statements)

References 8 publications

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“…For the newer TTFD radars with a wider field of view, beam 0 would be at an azimuth of 37 ı with a maximum measurable elevation of 53 ı . resolution of 2 ambiguities, the reader is referred to Sherrill [1971] and Kendall [1965].…”

Section: Elevation Angle-of-arrival Calculations For a Dual-interferomentioning

confidence: 99%

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Elevation angle‐of‐arrival determination for a standard and a modified superDARN HF radar layout

et al. 2013

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[1] Calculations have been developed for the determination of elevation angle of arrival for a modified Super Dual Auroral Radar Network (SuperDARN) HF radar antenna layout consisting of dual auxiliary interferometer arrays: one behind and one in front of the main array. These calculations show that such a layout removes the 2 ambiguity or angle-of-arrival aliasing effect observed in existing SuperDARN HF radars. Ray tracing and simulation results are presented which show that there is significant potential for aliasing with existing SuperDARN radars and the standard interferometer algorithm under routine operating conditions. Citation: McDonald, A. J., J. Whittington, S. de Larquier, E. Custovic, T. A. Kane, and J. C. Devlin (2013), Elevation angle-of-arrival determination for a standard and a modified superDARN HF radar layout, Radio Sci., 48,[709][710][711][712][713][714][715][716][717][718][719][720][721]

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Section: Elevation Angle-of-arrival Calculations For a Dual-interferomentioning

confidence: 99%

“…For a more general theoretical framework for direction‐finding calculations in RF interferometers and the resolution of 2 π ambiguities, the reader is referred to Sherrill [] and Kendall [].…”

Section: Elevation Angle‐of‐arrival Calculations For a Dual‐interferomentioning

confidence: 99%

Elevation angle‐of‐arrival determination for a standard and a modified superDARN HF radar layout

et al. 2013

View full text Add to dashboard Cite

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“…A classic and simple type of monopulse is the phasecomparison monopulse, which uses the measured phase differences of two antennas' outputs to establish the target bearing. An inherent problem with such monopulse system is that the resulting angle information can be ambiguous when the spacing of the two antennas or arrays is more than half a wavelength, which is often the case for high precision measurement [2,3]. One of the common ways to solve this ambiguity problem is to use staggered baseline length [3,4], which is to make another measurement with a different antenna spacing (and thus different ambiguity) and combine the two ambiguous measurements into one unambiguous measurement.…”

Section: Introductionmentioning

confidence: 99%

Direction Finding Using Multiple Sum and Difference Patterns in 4D Antenna Arrays

Zhu

Yang

Yao

et al. 2014

International Journal of Antennas and Propagation

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Traditional monopulse systems used for direction finding usually face the contradiction between high angle precision and wide angle-searching field, and a compromise has to be made. In this paper, the time modulation technique in four-dimensional (4D) antenna array is introduced into the conventional phase-comparison monopulse to form a novel direction-finding system, in which both high angle resolution and wide field-of-view are realized. The full 4D array is divided into two subarrays and the differential evolution (DE) algorithm is used to optimize the time sequence of each subarray to generate multibeams at the center frequency and low sidebands. Then the multibeams of the two subarrays are phase-compared with each other and multiple pairs of sum-difference beams are formed at different sidebands and point to different spatial angles. The proposed direction-finding system covers a large field-of-view of up to ±60° and simultaneously maintains the advantages of monopulse systems, such as high angle precision and low computation complexity. Theoretical analysis and experimental results validate the effectiveness of the proposed system.

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“…A classic type of monopulse is the phase-comparison monopulse, which uses the measured phase difference of two antennas or arrays' outputs to establish the target bearing. An important problem with such monopulse system is that when the two antennas are more than half a wavelength apart, the resulting angle information is ambiguous [4], limiting the angle-searching range.…”

Section: Introductionmentioning

confidence: 99%

A phase-comparison monopulse system based on a 4D antenna array

Zhu

Yang

Yao

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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Conventional monopulse systems based on sum and difference patterns produced by traditional arrays face the contradiction of angle-resolution and angle-searching range, and a compromise between them usually has to be made. In fourdimensional (4D) antenna arrays, multiple pairs of sum and difference patterns can be produced simultaneously at the center frequency and low sidebands. By designing the time sequences reasonably, the multiple sum and difference patterns point in different directions, covering a much wider angle-range. In this paper, the conventional phase-comparison monopulse is introduced into a 4D array to form a novel monopulse system by which both high angle-resolution and wide angel-searching range are realized. Theoretical analysis shows that the novel monopulse system covers a ±60º angle-searching range without beamscanning. An experiment system based on an 8-element 4D array is established, and measurement results validate the effectiveness of the proposed system. Index Terms-4D arrays, time-modulated arrays, direction finding, differential evolution, monopulse system, sum and difference pattern.

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Unambiguous Accuracy of an Interferometer Angle-Measuring System

Cited by 27 publications

References 8 publications

Elevation angle‐of‐arrival determination for a standard and a modified superDARN HF radar layout

Elevation angle‐of‐arrival determination for a standard and a modified superDARN HF radar layout

Direction Finding Using Multiple Sum and Difference Patterns in 4D Antenna Arrays

A phase-comparison monopulse system based on a 4D antenna array

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