Czech radar technology

Schejbal, Vladimír; Capalini, R.; Götz, Julia; Konečný, Jan; Kupcak, D.; Kvitek, E.; Remta, F.

doi:10.1109/7.250400

Cited by 19 publications

(7 citation statements)

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“…However, this approach is not quite satisfactory. Therefore, coverage diagrams of manufactured monostatic radars, which usually employ the same antenna for both transmitting and receiving antenna (i.e., G T = G R and f T = f R ), have been analyzed for numerous airports and radars, using the described PO method since the 1970s [31]. Figure 4 shows the new numerical simulations of electric fields for elevation angles, θ.…”

Section: Monostatic Radarsmentioning

confidence: 99%

Study of Refraction Effects for Propagation over Terrain

Schejbal¹,

Fišer²,

Zavodny³

2019

Waveguide Technologies in Photonics and Microwave Engineering [Working Title]

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This chapter investigates the radio-wave propagation above irregular ground, including the troposphere, using physical optics computation. We briefly describe used simplifications, which substantially reduce numerical simulations. Using the principle of stationary phase, we can approximate the propagation over a terrain (the PO approximation of the vector problem with a 3-D surface) with a 2-D surface. Moreover, we approximate the reflection coefficient for a surface with random deviations considering the surface standard deviation and the local Fresnel reflection coefficient for the smooth ground. We present the novel computations of physical optics for investigations of radar coverage diagrams. We consider both monostatic and bistatic radars, the far-field antenna measuring ranges, and studies of air refraction index. We validate the calculations by both experimental results and the other numerical simulations. The experimental results changed during seasons and according to terrain and troposphere conditions including vegetation, cultivation, snow, and air temperature and pressure.

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Section: Monostatic Radarsmentioning

confidence: 99%

Study of Refraction Effects for Propagation over Terrain

Schejbal¹,

Fišer²,

Zavodny³

2019

Waveguide Technologies in Photonics and Microwave Engineering [Working Title]

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“…Obviously, the hoghorn can be used separately without reflector -such as antennas for passive multilateration systems TAMARA and VERA [5], [6]. Various advantages of hoghorns are well known such as high efficiencies, low levels of back lobe radiations, excellent impedance matching and reasonable stabilities of radiation patterns.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation for hoghorn design

Vlasak

Schejbal

2014

2014 24th International Conference Radioelektronika

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The paper describes full-wave numerical simulations for design of hoghorn, which is formed by a sectoral horn, flaring in only one plane, with parabolic cylinder. Hoghorns possess high efficiencies, low levels of back lobe radiations, good impedance matching and reasonable radiation pattern stabilities. However, near-by sidelobes are relatively higher. The numerical results are compared with the measurements.

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“…Various produced radars have been described [7], where variable elliptical polarization is created by rotating dielectric or metal parallel plates in front of horn, by the rotation of dielectric quarter wave plate in the circular waveguide or by the rotation of rectangular waveguide feeding the circular and subsequent square waveguide. Certain radars contain optional separate weather channel.…”

Section: Introductionmentioning

confidence: 99%

Design of Square Waveguide Corner

Hnilicka¹,

Schejbal²,

Fisher³

et al. 2018

2018 New Trends in Signal Processing (NTSP)

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The paper presents a full-wave design for matching a square mitered waveguide corner. We compare the full-wave numerical simulations with experimental results. The corner can operate with both polarizations, i.e. TE10 for magnetic plane bend and TE01 for electric plane bend. That is very useful for intended meteorological radar. That could use dual polarization transmit and receive both horizontal and vertical polarizations to assess additional properties of the weather targets.

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Czech radar technology

Cited by 19 publications

References 0 publications

Study of Refraction Effects for Propagation over Terrain

Study of Refraction Effects for Propagation over Terrain

Numerical simulation for hoghorn design

Design of Square Waveguide Corner

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