Error correction-extended Kalman filter (EC-EKF) algorithm based optical intelligent antenna wave beam control method

Abstract

The invention discloses an error correction-extended Kalman filter (EC-EKF) algorithm based optical intelligent antenna wave beam control method, aiming to solve the problem of low reliability of the link in existing high-speed mobile wireless laser communication. According to the technical scheme, an optical intelligent antenna with a structure of regular icosahedron is adopted, each surface of the regular icosahedron has a receiving unit and a transmitting unit, and the units are numbered, so that 360-degree coverage is realized; motion information of a peer communication machine is predicted through the EC-EKF algorithm, so as to determine which coverage range of the transmitting unit the peer communication machine is in, and a corresponding laser transmitting unit is opened, so as to capture and track a target to continue the communication process; and the EC-EKF algorithm is extended, and a prediction value of present moment is corrected with an error value of a previous moment so as to obtain the motion information of the target at next moment. According to the method, while the real-time performance and mobility of communication are ensured, the reliability of the communication system link is improved. The method can be applied to the field of high-speed mobile wireless laser communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to an optical smart antenna beam control method, which can be used in a free-space optical communication system with high requirements for multi-node, high-speed mobility, reliability and real-time performance. Background technique [0002] Wireless laser communication, also known as free space optical communication (FSO), refers to a communication method that uses laser beams as a carrier to directly transmit data, voice, video and other services in space, that is, in the atmosphere, space or sea water. It has many advantages such as large capacity, strong anti-interference ability, flexible networking and high security and confidentiality. It has attracted widespread attention and is recognized as an excellent communication method of "broadband + wireless" in the future, with broad application prospects. [0003] Since WLC is a line-of-sight transmission system, it is...

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Problems solved by technology

However, the disadvantage of this method is that the antenna adopts a mechanical servo system. When the relative moving speed between targets is large, the mechanical rotation rate will affect the communication process, and the above method is only suitable for short-distance slow communication, and Frequent rotations during the continuous alignment process will cause time delays, which will lead to errors in tracking and aiming accuracy and affect the real-time performance of communication

However, the disadvantage of this method is that multiple transmitting units need to be turned on at the same time, which increases power consumption, and once the target moves out of the coverage area, the link is interrupted, and the antenna must passively wait for the target to move to the opened transmitting unit Within the coverage area, the link is re-established, resulting in a long link switching delay, which reduces the real-time and stability of communication

However, the disadvantage of this model is that the optical antenna of this system is connected with the two-axis four-frame, and the two-axis four-frame abutment controlled by the computer to control the outer frame to follow the inner frame can only realize horizontal and pitch two. The rotation in one direction is not conducive to the reception and transmission of signals in any direction, which leads to the reduction of the system's capture and tracking range and the reduction of alignment accuracy, which cannot meet the needs of high-speed mobile wireless laser communication link establishment.

[0008] From the above analysis, it can be seen that the traditional APT system can basically meet the communication requirements in the case of low-speed movement, but in the case of high-speed movement, due to the influence of the mechanical performance and control algorithm of the antenna, it affects the tracking of the APT system in the case of high-speed movement. Aiming accuracy, the communication performance of the link is not well guaranteed

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