Radio frequency/laser cooperative rapid capturing, tracking and aligning method

Abstract

The invention discloses a radio frequency / laser cooperative rapid capturing, tracking and aligning method, and aims to provide a capturing, tracking and aligning method capable of rapidly capturing and aligning light beams in a high probability in a long-distance whole airspace. The invention is realized through the following technical method: in the radio frequency tracking stage, a beam pointingcontroller extracting an alignment error between a target pointing direction and a current actual pointing direction as a feedback quantity according to radio frequency omnidirectional beam and radiofrequency directional beam detection information, quickly searching for and capturing a laser beam through radio frequency beam assistance in a full airspace range, and switching to laser tracking; in a laser tracking phase, the beam pointing controller extracting an alignment error between a target pointing direction and a current actual pointing direction as a feedback quantity by respectivelyutilizing beam information detected by an optical coarse field of view and a fine field of view, controlling the laser beam pointing direction, further reducing the beam alignment error in a radio frequency tracking alignment error range, and guaranteeing continuous precise tracking alignment of a laser communication link.

Description

technical field [0001] The invention relates to a beam fast capture tracking alignment method suitable for wireless laser communication between high mobility platforms and laser / radio frequency integrated communication. Background technique [0002] Wireless laser communication uses laser as the information carrier and free space or the atmosphere as the transmission channel to realize the transmission of information. Its main features include: 1. High communication bandwidth: laser communication systems mostly use lasers in the infrared band, and their carrier frequency is several hundred THz, which is several orders of magnitude higher than that of radio frequency communication. It provides a data transmission rate of more than 10Gbps, which is much higher than the data transmission rate of hundreds of Mbps in current radio frequency communication. 2. The beam divergence angle is small: the shorter the carrier wavelength, the higher the antenna gain, and the smaller the a...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: first, the transmission distance of the light beam with a large divergence angle is limited, and it can only be captured in a short distance, and cannot be used for a long-distance mobile platform; second, the optical detector with a large field of view needs to capture the light beam Using image tracking, in the case of complex background, it is difficult to extract the image target and automatically adjust the size of the field of view, and it needs to be assisted by a certain amount of manual operation, and it is impossible to realize the automatic fast capture of the beam; the third is on the platform with high mobility and strong vibration In the application environment, the narrow beam signal is very easy to lose. Once the optical signal is lost by the existing optical detector, it is difficult to quickly recapture the laser link in a small area.

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