M. K. Lebedev

  • Citations Per Year
Learn More
Geometrical optics (GO) based methods are widely used for modeling and parameters determination of big reflector antennas in the millimeter wave band, when the diffraction effects are small enough, and computations using methods that are more precise would take excessively long time. The main features of the ray tracing technique we used in our work are(More)
Results of simulations of RATAN-600 radio telescope focusing optics are given. It is shown that due to suboptimal shape of the secondary mirror, the total energy loss amounts to 10%÷15% at low elevations and 2÷4% at high elevations. New ways of focusing optics optimization, which allow to compensate for up to 80% of the energy loss caused by(More)
The methods of radiation pattern simulation of a large MM wave radiotelescope are considered. Off/on-axis aberrations of a MM wave radio telescope are estimated. Results of single beam simulation for MM wave radio telescope RT-70 with offset feed are given. BP simulation of MM wave radiotelescope RT-70 confirms the acceptability of the off-axis aberrations(More)
A fast and adaptive near-field physical optics algorithm is developed for the analysis of general multi-reflector antenna systems. The algorithm is applied to the radiation pattern computation of an extremely large antenna of RATAN-600 radio telescope operating at mm-wave frequencies. Near-field reflector to reflector field propagation and far-field(More)
The ray tracing and integral equation methods are used to optimize focal optics and focal plane array configuration of the single, dual and multi-mirror mm-wave telescopes. Simulation and optimization techniques are considered, results being presented for on-axis mm-wave reflector and RATAN-600 radio telescope. Near and far fields of RATAN-600 radio(More)
We describe two methods of fast condition diagnostics of the reflecting surface of the RATAN-600 radio telescope. The first one is based on a radio holography, and the second one relies on measurements of the random scattered background in the observations of the extended radio sources. Both methods were used in the antenna measurements, which proved the(More)
The new optical scheme of RATAN-600 in a multibeam mode a compact effective array feed in 3–8mm band is described. Two compact smooth-walled spline-profile horns as alternative to the corrugated horn has been optimized, manufactured and tested. The antenna measurement and theoretical results are in good agreement with simulation. The results of the(More)
A fast and adaptive near-field physical optics algorithm is developed for the analysis of general multi-reflector antenna systems. The algorithm is applied to the radiation pattern computation of an extremely large antenna of RATAN-600 radio telescope operating at mm-wave frequencies.
  • 1