Improved Phase Center Estimation for GNSS Patch Antenna

Kumar, Ashwani; Sarma, A. D.; Ansari, Ezharul; Kamatham, Yedukondalu

doi:10.1109/tap.2012.2232896

Cited by 28 publications

(12 citation statements)

References 8 publications

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“…Since most antennas do not hold an ideal and unique phase center but an MPC within the interested angular region of surrounding space, an effective method to determine the MPC of antenna is desired. Several techniques for phase center estimation can be used such as spherical phase expansion computation method, edge diffraction method, and three-antenna method [2]. In this paper, we calculate the MPC by using the simulation software ANSYS Electronics Desktop.…”

Section: The Determination Of Mpc and Pcvmentioning

confidence: 99%

“…For an ideal point source antenna, phase pattern is constant when the antenna reference point corrected to the unique phase center, that is, the PCV is zero. However, for most antennas, there exists a deviation in the actual phase front from the ideal one at various angles of wave incidence, and the deviation is defined as PCV, which will cause ranging error for GNSS applications [2]. Therefore, MPC stability can be evaluated by PCV, and low PCV means stable antenna phase center over the observing region.…”

Section: The Determination Of Mpc and Pcvmentioning

confidence: 99%

“…As a result, a multi-mode GNSS antenna suitable for all the GNSS systems should be circularly polarized (CP) on the whole GNSS bands ranging from 1.164 GHz to 1.612 GHz, viz., from the lowest Galileo E5a/E5b band (1189.5 MHz ± 25.5 MHz) to the highest GLONASS L1 (1605 MHz ± 7 MHz) band, which indicates a relative bandwidth of 32.2%. For high-precision positioning service such as deformation measurement of the earth's crust and attitude determination, a multi-mode antenna should provide stable antenna phase center in all the GNSS bands and for all directions in the broad beam [2].…”

Section: Introductionmentioning

confidence: 99%

“…In practice, phase center variation (PCV) can be used to evaluate the stability of MPC over the observing region, which is the deviation between the real phase front and the ideal one when the antenna reference center corrected to the MPC. Therefore, for high-precision positioning, accurate MPC and low PCV are desired [2,10]. Generally, stable phase center tends to require symmetric antenna configurations [11], which is somewhat different from the asymmetry requirement for single-fed CP antennas.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Broadband Crossed-Slot Circularly Polarized Antenna With Stable Phase Center for GNSS Applications

Zhang¹,

Guo²,

Zhang³

et al. 2018

PIER C

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A broadband circularly polarized microstrip antenna with stable phase center is proposed for multi-mode GNSS applications. The proposed antenna consists of two crossed slots on one side of PCB and a Γ-shaped microstrip feeding structure on the other side of PCB. Measurement of the designed antenna demonstrates that a −10-dB impedance bandwidth of 76.7% and a 3-dB axial ratio bandwidth of 64% are realized, which cover all GPS, BeiDou, Galileo, and GLONASS bands ranging from 1.164 GHz to 1.612 GHz. In addition, stable phase center for orientation in the region above 10 • elevation is realized for high-precision positioning. For each GNSS band, phase center variation with respect to its own mean phase center can be retained within 5 •. Over the whole GNSS bands, phase center variation with respect to the common mean phase center is retained within 6 • .

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Section: The Determination Of Mpc and Pcvmentioning

confidence: 99%

Section: The Determination Of Mpc and Pcvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Broadband Crossed-Slot Circularly Polarized Antenna With Stable Phase Center for GNSS Applications

Zhang¹,

Guo²,

Zhang³

et al. 2018

PIER C

View full text Add to dashboard Cite

show abstract

“…Various methods for determination of the phase center have been proposed. Conventional phase center calibration methods include field calibration technique [3][4][5] and anechoic chamber calibration technique [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phase Errors Simulation Analysis for GNSS Antenna in Multipath Environment

Chen

et al. 2015

International Journal of Antennas and Propagation

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High-precision GNSS application requires the exact phase center calibration of antenna. Various methods are published to determine the locations of the phase center. In the outfield, when the phase errors that arose by multipath exceed the phase center variations (PCV) tolerance, the calibration values may be not useful. The objective of this paper is thus to evaluate the phase errors that arose by multipath signals. An improved model of antenna receiving signal is presented. The model consists of three main components: (1) an antenna model created by combination of right hand circular polarization (RHCP) and left hand circular polarization (LHCP), (2) a multipath signals model including amplitude, phase, and polarization, and (3) a ground reflection model applying to circular polarization signals. Based on the model, two kinds of novel up-to-down (U/D) ratios are presented. The performance of the model is assessed against the impact of up-to-down ratio of antenna on phase errors.

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Investigation and improvement of the phase-center characteristics of VIVALDI's antenna for UWB applications

Arezoomand

Sadeghzadeh

Naser‐Moghadasi

2016

Microw. Opt. Technol. Lett.

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In this article, the phase center of antipodal Vivaldi antennas is investigated, because the phase center location of antennas is an important parameter for pulse transmission/reception. A comparison between these models is presented and our model is proposed to reduce their drawbacks by some techniques to show the effect of these techniques or benefits of them by numerical simulations and experimental results. Vivaldi antenna is celebrated for its benefits such as low profile, easy fabrication, high gain, end‐fire radiation pattern. In this article, the phase center behavior in antipodal Vivaldi antenna is shown and a novel implementation of a perpendicular lens and planner aperture are presented on an antipodal antenna for modification of the Phase‐Center characteristic in single. We have presented a novel technique for amending pattern and gain parameters to achieve linear phase center in the wide bandwidth. In this new method, we have combined the aperture method with Vivaldi antenna. The final antenna shows good performance in 2–18 GHz with VSWR less than 2 and the gain of the antenna is enhanced more than 1–2 dBi in comparison with conventional Vivaldi antenna. The antenna is fabricated on roger 4003 and the experimental result confirms the simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1275–1281, 2016

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Improved Phase Center Estimation for GNSS Patch Antenna

Cited by 28 publications

References 8 publications

A Broadband Crossed-Slot Circularly Polarized Antenna With Stable Phase Center for GNSS Applications

A Broadband Crossed-Slot Circularly Polarized Antenna With Stable Phase Center for GNSS Applications

Phase Errors Simulation Analysis for GNSS Antenna in Multipath Environment

Investigation and improvement of the phase-center characteristics of VIVALDI's antenna for UWB applications

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