A tracking system and adjustment method

Abstract

The invention discloses a tracking and aiming system and an adjustment method, belonging to the technical field of laser communication. The following aiming system includes a rough aiming device, a fine aiming device, a third reflector, a quarter wave plate, a polarizing beam splitter, an S-line polarized light source, a collimator, a first optical filter, a focusing lens, a second Optical filter, second linear polarizer, non-polarizing beam splitter, third linear polarizer, third optical filter and fixed-focus lens; the rough pointing device includes a first reflector, a capture tracking detector, and the capture tracking detector The device is communicatively connected with the first reflector, and the precision aiming device includes a second reflector and a four-quadrant detector, and the four-quadrant detector is communicatively connected with the second reflector. Compared with the prior art, the tracking and aiming system of the present invention adopts a combination of a rough aiming device and a fine aiming device, which can achieve higher tracking and aiming accuracy, and can effectively suppress the influence of stray signals on CCD image processing and PSD positioning accuracy, The possibility of position misjudgment and loss of tracking signal is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser communication, and relates to a tracking and aiming system and an adjustment method. Background technique [0002] The free space optical communication system uses wireless lasers to "connect" two long-distance or short-distance communication terminals to form a communication data transmission link, which has the advantages of large communication capacity, long transmission distance, and good confidentiality. Long-distance system applications include optical communication between two satellites thousands of kilometers away, and short-distance wireless communication systems such as "FSO for last mile optical transmission". This kind of wireless laser communication technology has a narrow beam width and a long transmission distance for signal transmission. It is difficult to establish and maintain a laser link in a space environment. Therefore, it is necessary to establish a set of high-reliability ca...

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Problems solved by technology

[0004] The purpose of the present invention is to establish a visible light tracking and aiming system and adjustment method for free space optical communication systems, to solve the nearly 5% energy left on the CCD and PSD due to the influence of coating and stray light on the non-polarization beam splitting prism. The possibility of misjudgment by the tracking system, decreased accuracy of tracking and aiming, or loss of signal due to bright spots

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