Mirror surface accuracy measuring device and mirror surface control system of reflector antenna

A mirror surface accuracy measuring device of a reflector antenna, in which mirror surface accuracy of a reflector antenna having a main reflector composed of a plurality of mirror panels is measured, comprising:

• a collimation antenna arranged at an interval of a prescribed distance from the reflector antenna;
• radiation field distribution measuring means for measuring a radiation field distribution of the reflector antenna for the prescribed distance of the collimation antenna while controlling an attitude of the reflector antenna;
• a virtual mirror panel radiation field distribution calculating device for dividing the main reflector into a plurality of virtual mirror panels and calculating a panel radiation field distribution of each virtual mirror panel;
• complex excitation coefficient calculating means for calculating a complex excitation coefficient of each virtual mirror panel of the main reflector according to the radiation field distribution of the reflector antenna measured by the radiation field distribution measuring means, the panel radiation field distribution of the virtual mirror panel calculated in the virtual mirror panel radiation field distribution calculating device and an antennal attitude signal which indicates the attitude of the reflector antenna controlled by the radiation field distribution measuring means;
• and mirror surface accuracy calculating means for calculating a mirror surface error of each virtual mirror panel and mirror surface accuracy of the main reflector according to the complex excitation coefficients of the virtual mirror panels of the main reflector calculated by the complex excitation coefficient calculating means.

A mirror surface control system of a reflector antenna, in which mirror surface accuracy of a reflector antenna having a main reflector composed of a plurality of mirror panels is controlled, comprising:

• a collimation antenna arranged at an interval of a prescribed distance from the reflector antenna;
• radiation field distribution measuring means for measuring a radiation field distribution of the reflector antenna for the prescribed distance of the collimation antenna while controlling an attitude of the reflector antenna;
• a mirror panel radiation field distribution holding device for holding a panel radiation field distribution of each mirror panel of the main reflector as pre-measured data;
• complex excitation coefficient calculating means for calculating a complex excitation coefficient of each mirror panel of the main reflector according to the radiation field distribution of the reflector antenna measured by the radiation field distribution measuring means, the panel radiation field distribution of the mirror panel held in the mirror panel radiation field distribution holding device and an antennal attitude signal which indicates the attitude of the reflector antenna controlled by the radiation field distribution measuring means;
• mirror surface accuracy calculating means for calculating a mirror surface error of each mirror panel and mirror surface accuracy of the main reflector according to the complex excitation coefficients of the mirror panels of the main reflector calculated by the complex excitation coefficient calculating means;
• and
• mirror surface control means for controlling and correcting a plurality of setting positions of the mirror panels of the main reflector according to the mirror surface errors of the mirror panels.

A mirror surface control system of a reflector antenna, in which mirror surface accuracy of a reflector antenna having a main reflector composed of a plurality of mirror panels is controlled, comprising:

• a collimation antenna arranged at an interval of a prescribed distance from the reflector antenna;
• radiation field distribution measuring means for
• measuring a radiation field distribution of the reflector antenna for the prescribed distance of the collimation antenna while controlling an attitude of the reflector antenna;
• a virtual mirror panel radiation field distribution calculating device for dividing the main reflector into a plurality of virtual mirror panels and calculating a panel field distribution of each virtual mirror panel;
• complex excitation coefficient calculating means for calculating a complex excitation coefficient of each virtual mirror panel of the main reflector according to the radiation field distribution of the reflector antenna measured by the radiation field distribution measuring means, the panel radiation field distribution of the virtual mirror panel calculated in the virtual mirror panel radiation field distribution calculating device and an antennal attitude signal which indicates the attitude of the reflector antenna controlled by the radiation field distribution measuring means;
• mirror surface accuracy calculating means for calculating a mirror surface error of each virtual mirror panel and mirror surface accuracy of the main reflector according to the complex excitation coefficients of the virtual mirror panels of the main reflector calculated by the complex excitation coefficient calculating means;
• and
• mirror surface control means for controlling and correcting a plurality of setting positions of the mirror panels of the main reflector according to the mirror surface errors of the virtual mirror panels.