Since modeling a real antenna with precise values for main beam and side lobes/back lobes is difficult, we employ a simplistic antenna model [3,8,9] in this paper.
Due to the very short wavelength, very compact directional antennas with very high gains and narrow beamwidth are possible, which require a very precise antenna alignment to achieve optimal performance [3].
Since the efficiency in detecting electric fields depends on the antenna impedance, the precise value of the antenna impedance is necessary to calibrate the electric field data.
The slot antenna is used for precise operating frequency, where the frequency spectrum is 2.45 GHz and 5.5 GHz.
Or, a precise satellite antenna that has both dimensional stability as well as excellent microwave performance can be constructed using specific amounts of carbon fiber.
In a second step, we have applied the SPOT2 antenna correction models in precise orbit determination and in the positioning of ground beacons.
Before the positioning of the plots started, the coordinates of the base station antenna were determined with precise point positioning with GPS and GLONASS data collected continuously for 24 h, following recommendations from Kouba [32].
We determined directions to a signal by lining up the antenna beam with a precise directional compass (Suunto, Finland).
By fiddling with their precise shapes, antennae lying on different circles could be coaxed into holding onto their photons for slightly different lengths of time, mimicking an ordinary glass lens.At present the new-fangled lens only works for monochromatic light, so it is unlikely to replace the glass sort in smartphone cameras anytime soon.
Recent studies have shown that phase pattern models for the Jason-1 GPS antenna significantly benefit GPS-based precise orbit determination (POD) for the satellite.
Turbulence intensities have been estimated from the width of the observed signal spectra using an computationally intensive correction method which requires precise knowledge of the antenna radiation pattern.
