A Novel Model for Direction Finding and Phase Center With Practical Considerations

Kornaros, Evangelos; Kabiri, Saman; Flaviis, F. De

doi:10.1109/tap.2017.2735462

Cited by 10 publications

(11 citation statements)

References 64 publications

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“…Equation (7) shows that the (Ɩ-1)th noise masks one sample of the signal group with the lower frequency Ω pL.Ɩ , and the (Ɩ+1)th noise masks 1 sample of the signal group {U k.Ɩ ( jΩ p )} pϵ[pL.Ɩ;pH.Ɩ] with the upper frequency Ω pH.Ɩ .…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

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Improving the accuracy of a digital spectral correlation-interferometric method of direction finding with analytical signal reconstruction for processing an incomplete spectrum of the signal

Smailov,

Tsyporenko,

Sabibolda

et al. 2023

EEJET

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A method of correlation-interferometric direction finding has been improved, which effectively solves the problem of radio direction finding of radio emission sources under conditions of exposure to one or two masking interference. The problem was solved using the selection of an unmasked fragment of the spatial spectrum of the signal and the reconstruction of the missing samples of its signal group. As a result of the synthesis of the proposed method, estimates of signal samples were obtained as exact solutions to the proposed energy balance equations. The resulting solutions provide a significant increase in the signal-to-interference ratio and, accordingly, direction-finding accuracy without increasing the number of reception channels of the antenna array. As a result of the simulation, the dependences of the standard deviation of the bearing estimate on the signal-to-noise ratio in the presence of interference were built. Under the influence of one or two masking interferences and a signal-to-interference ratio of 0 dB, the use of the known direction-finding method without interference selection produces an anomalously large direction-finding error of more than 0.42 degrees, which is practically independent of the signal-to-noise ratio. The direction-finding method with selection of spectral signal samples masked by interference reduces the direction-finding error to 0.22 degrees when exposed to one interference and to 0.3 degrees when exposed to two interferences. This is due to the presence of power losses of the usable signal during the selection of its samples masked by interference. The proposed method of direction finding with reconstruction of signal samples provides a significant gain in accuracy by 3–30 times compared to the method of selection of masked samples in the range of changes in the signal-to-noise ratio (–20.5) dB. The direction-finding error of the proposed method decreases with increasing signal/noise according to a hyperbolic dependence. It is advisable to use the proposed direction-finding method when masking no more than two samples of the signal group

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Section: The Study Materials and Methodsmentioning

confidence: 99%

“…In [7], a data model for a single-channel direction finding system with switching between antennas was studied. The work examined compensation for the mutual influence of antenna elements and the imperfection of the switch.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the accuracy of a digital spectral correlation-interferometric method of direction finding with analytical signal reconstruction for processing an incomplete spectrum of the signal

Smailov,

Tsyporenko,

Sabibolda

et al. 2023

EEJET

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show abstract

“…One simple method is to increase the physical radius of the DF array. However, it makes the effective radius of the DF array very large at high frequency, which leads to the ambiguousness of the DF results [6]. In practice, due to the limited space for DF array installation, the size of the array is always limited to a certain range.…”

Section: Introductionmentioning

confidence: 99%

A Novel Nonlinear LPDA Design for HF Direction Finding

Ren

Li²,

Gong

2019

International Journal of Antennas and Propagation

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A novel design of log-periodic dipole array (LPDA) for high-frequency direction finding (DF) is presented. The traditional Carrel method employs fixed values of scale factor and spacing factors in LPDA designs. Here, we propose a design method which uses the continuous change of both the scale factor and the spacing factor so that the length of the dipoles and the space between dipoles vary nonlinearly. One advantage of our design is that the effective distance between the phase center position and the feed point of LPDA can be increased. So the effective radius of the circularly disposed antenna array (CDAA) composed of LPDA is extended, which is important for improving the accuracy of the DF system. Both the simulation and measurement results show that the proposed LPDA achieves larger effective distance and higher gain compared to that using the traditional Carrel method. The proposed LPDA also shows characteristics of wideband impedance matching. The antenna has been successfully applied to practical HF direction finding system.

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“…In these arrays, the orientations of all elements are the same, which constitute a homogeneous array. According to the simple relationship of geometric phase among array elements, the direction of arrival (DOA) is estimated by means of related interferometer or MUSIC, which has been widely applied in many DF systems [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Direction of Arrival Estimation Based on Heterogeneous Array

Ren¹,

Gong²

2018

PIER M

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Abstract-Traditionally, the direction of arrival (DOA) estimation usually employs homogeneous antenna arrays consisting of many identical antennas. This paper proposes a new technique of DOA estimation by using a heterogeneous array which has many elements with each element pointing to a different direction from others. A general expression of the manifold for planar heterogeneous array is derived. Then, a polarized MUSIC (Pol-MUSIC) method for unknown polarizations is proposed. One advantage of this Pol-MUSIC method is that it can obtain the DOA of signals with any unknown polarizations while no search of the polarizations is required. The proposed method is verified by simulation, and its performance is analyzed. The heterogeneous array is a polarization-sensitive array though it has one channel at each point of spatial sampling. This provides favorable conditions for simplifying the systems.

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A Novel Model for Direction Finding and Phase Center With Practical Considerations

Cited by 10 publications

References 64 publications

Improving the accuracy of a digital spectral correlation-interferometric method of direction finding with analytical signal reconstruction for processing an incomplete spectrum of the signal

Improving the accuracy of a digital spectral correlation-interferometric method of direction finding with analytical signal reconstruction for processing an incomplete spectrum of the signal

A Novel Nonlinear LPDA Design for HF Direction Finding

Direction of Arrival Estimation Based on Heterogeneous Array

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