A two-axis antenna overhead method

Abstract

The invention discloses a method for overtopping a two-axis antenna, which belongs to the technical field of antennas. The antenna elevation axis of the present invention can rotate continuously within the range of 0-180 degrees. The present invention first obtains the attitude information of the antenna carrier in real time, then calculates the theoretical value of the pointing angle of the antenna to the star according to the target satellite information, and calculates the position and attitude of the antenna in real time according to the theoretical value of the pointing angle to the star and the change of the position and attitude during the movement of the carrier. The star points to the deck angle to judge whether the pitch axis needs to be over the top. By adopting the method of the invention, the antenna elevation angle range can reach 0-180 degrees, and when the two-axis antenna is over the top at the sub-satellite position, the elevation axis can directly exceed 90 degrees to achieve over-the-top without requiring rapid azimuth rotation. In the case of reducing the requirement of the tracking precision index, the present invention can meet the requirements of tracking and communication.

Description

technical field [0001] The present invention relates to the technical field of antennas, in particular to a method for overtopping a two-axis antenna. Background technique [0002] The communication antenna needs to calculate the pointing angle of the antenna in real time according to the target satellite information and the position and attitude changes during the movement of the carrier, and control the antenna to quickly align the satellite to track to ensure the transmission of communication signals. [0003] The traditional small-caliber two-axis antenna tracking method in high latitude areas, when the pitch angle is low, with the movement of the carrier, the azimuth rotation range, speed and acceleration are small, which can well meet the tracking and communication requirements, but cannot be used for overhead tracking. Meet tracking and communication requirements. At present, the existing antenna overhead methods have the following shortcomings: [0004] 1) The trad...

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Problems solved by technology

[0004] 1) The pitch angle range of the traditional two-axis antenna is 0-90 degrees. When the two-axis antenna is over the top under the star, the pitch axis angle cannot exceed 90 degrees;

[0005] 2) When the two-axis antenna is over the top under the star, the angle of the pitch axis is close to 90 degrees. In theory, the azimuth needs to be rotated by a maximum of 180 degrees in a single control cycle, and the required rotation speed is very high, which is far beyond the maximum rotation speed and acceleration of the azimuth. The antenna Unable to complete the tracking task, even if the tracking accuracy index requirements are lowered, the current two-axis antenna still cannot meet the tracking and communication requirements when tracking overhead

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