| The "Push-broom" satellite scanning antennas have attracted the attention of scholars in recent years.The reason is that compared with traditional conical scanning antennas,push-broom scanners have important advantages in terms of providing a larger field of view and higher efficiency.This system can observe a specific area of the ocean for a longer period of time when multiple beams exist simultaneously,and is widely used in measuring ocean salinity,ocean surface temperature,ocean vector wind and other ocean parameters.The small-caliber single-reflector compact field antenna is used in a hardware-in-the-loop simulation system.The research content of this paper mainly includes the following two aspects:1.Completed the simulation design of the push-broom satellite radiometer antenna;2.Developed a C-band small aperture single reflector compact field antenna.This article first introduces the relevant basic theories of reflector antennas,including antenna electrical performance indicators and related analysis methods that are concerned in reflector antenna design.This is the theoretical basis for the design of offset parabolic toroid antennas and single reflector compact field antennas.The first part of this article analyzes the working principle of the push-broom parabolic toroid antenna,derives the angle between multiple beams and the feed position,the surface error of the offset parabolic torus,and the calculation formula for the width of the reflector.The design is divided into two parts,one is the design of the offset parabolic torus,and the other is the design of the feed array.Firstly,calculate the optimal size of the parabolic toroidal reflector to minimize the surface error between it and the ideal parabola.Secondly,place a dense feed array in the plane area near the focus of energy concentration to receive more energy to form the target angle resolution Rate of beam.Taking the L-band center frequency 1.415 GHz as an example,a ring reflector with a target angular resolution of 1.8 degrees and a circular reflector with an angular resolution of 5degrees are designed,and the center beam with a target angular resolution of 5 degrees is calculated.The 3×3 dense feed array is programmed by MATLAB and the genetic algorithm is used to calculate the amplitude and phase distribution of the feed unit to synthesize the central beam.The simulation results show that the antenna port voltage standing wave ratio is less than 1.3,the 3d B beam width is greater than 5°,and the main beam efficiency is greater than 99%.Meet the technical index requirements.In the second part of this article,according to the requirements of scientific research projects,a C-band small aperture single reflector compact field antenna is designed.The compressed field is a device used to generate a simulated plane wave.In this paper,two types of feeds are simulated: a special-shaped pyramid horn and a corrugated horn.A reflection surface with a serrated edge of about 12 wavelengths is designed.Within the working bandwidth of 1GHz,the index requirements The amplitude of the quiet zone is less than 2.5d B,and the phase is ±12 degrees.The test results meet the index requirements. |
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