Common optical path aiming system and method based on floating zero point

Abstract

The present invention relates to the field of laser transmission and beam control, and in particular to a common optical path aiming system and method based on a floating zero point, comprising a laser transmitter, a tilting mirror, a beam splitter, a telescope secondary mirror, a telescope primary mirror, a laser receiving target, a corner cube prism, a dichroic mirror, a first lens, a laser detection camera, a second lens, a target detection camera, and a tilting mirror control unit. The present invention can achieve the goal of using a tilting mirror to accurately aim the emitted laser at the laser receiving target by stabilizing the imaging centroid in the laser detection camera at the floating zero point, and has the advantages of simple structure and reduced cost.

Description

Technical Field

[0001] The invention belongs to the technical field of laser transmission and light beam control, and in particular relates to a common light path aiming system and method based on a floating zero point. Background Art

[0002] In applications such as laser communication, it is necessary to accurately transmit the laser to the laser receiving target. However, due to the influence of mechanical jitter, atmospheric turbulence and other factors, the laser cannot stably aim at the laser receiving target.

[0003] Generally, a common optical path design method can be used to improve the accuracy of aiming at the target. However, the existing technology mainly has the following problems: when one tilt mirror is used for aiming, the relative jitter between the laser receiving target and the emitted laser cannot be effectively corrected; and to achieve the correction of this relative jitter, two tilt mirrors are required, thereby increasing the complexity of the system. Summary of the invention

[0004] In view of the defects and shortcomings in the prior art, a common optical path aiming system and method based on a floating zero point are provided.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A common optical path aiming system based on a floating zero point includes a laser transmitter, a tilt mirror, a beam splitter, a telescope secondary mirror, a telescope primary mirror, a laser receiving target, a corner cube prism, a dichroic mirror, a first lens, a laser detection camera, a second lens, a target detection camera, and a tilt mirror control unit;

[0007] The laser transmitter outputs the laser to the tilt mirror, and the laser reflected by the tilt mirror is incident on the beam splitter, and is divided into two lasers by the beam splitter;

[0008] The first laser beam reflected by the beam splitter is transmitted to the secondary mirror of the telescope, and then reflected by the secondary mirror and the primary mirror of the telescope, and then emitted to the laser receiving target.

[0009] The second laser beam transmitted by the beam splitter is transmitted to the corner cube prism, and after being reflected by the corner cube prism, it returns along the original direction, and after being reflected by the beam splitter again, it enters the dichroic mirror, and after being reflected by the dichroic mirror, it is focused by the first lens and enters the laser detection camera;

[0010] The light reflected from the laser receiving target is reflected by the telescope primary mirror and the telescope secondary mirror in turn, transmitted through the beam splitter and the dichroic mirror, focused by the second lens, and then enters the target detection camera;

[0011] Both the laser detection camera and the target detection camera are connected to the tilt mirror control unit, which collects the normalized imaging centroids of the laser detection camera and the target detection camera. By controlling the tilt angle of the tilt mirror, the normalized imaging centroid of the laser detection camera is always kept at the floating zero point, so that the emitted laser can be accurately aimed at the laser receiving target.

[0012] On the other hand, the aiming method of the common optical path aiming system based on the floating zero point includes the following steps:

[0013] The laser detection camera and target detection camera in the common optical path aiming system are calibrated. The calibration target is set at a fixed position. The common optical path aiming system and the calibration target are both in a static state. The optical path is adjusted to make the emitted laser incident on the calibration target, and the normalized imaging centroid (x 1-0 ,y 1-0 ) and the normalized imaging centroid of the target detection camera (x 2-0 ,y 2-0 );

[0014] Based on the calibrated common optical path aiming system, the actual target is aimed at, and the actual target is a static fixed target or a dynamic moving target. During the actual target aiming process, the tilt mirror control unit collects the normalized imaging centroid (x1, y1) of the laser detection camera and the normalized imaging centroid (x2, y2) of the target detection camera in real time, and controls the tilt angle of the tilt mirror to keep the normalized imaging centroid of the laser detection camera always at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ) to accurately aim the emitted laser at the actual target.

[0015] Compared with the prior art, the technical effects of the present invention are:

[0016] Because the present invention only needs one tilt mirror, it can effectively correct the relative jitter between the laser receiving target and the emitted laser, thereby achieving high-precision aiming of the emitted laser. Specifically, the present invention proposes a common optical path aiming system and method based on a floating zero point, by stabilizing the imaging centroid in the laser detection camera at the floating zero point (x1=x2+x 1-0 -x 2-0 ,y 1-0 =y2+y 1-0 -y 2-0 ), it is possible to use a tilt mirror to accurately aim the emitted laser at the laser receiving target, which has the advantages of simple structure and reduced cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the common optical path aiming method based on floating zero point of the present invention;

[0019] Numbers in the figure:

[0020] 1. Laser transmitter; 2. Tilt mirror; 3. Beam splitter; 4. Secondary mirror of telescope; 5. Primary mirror of telescope; 6. Laser receiving target; 7. Corner cone prism; 8. Dichroic mirror; 9. First lens; 10. Laser detection camera; 11. Second lens; 12. Target detection camera; 13. Tilt mirror control unit. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Figure 1 , an embodiment provides a common optical path aiming system based on a floating zero point, including a laser transmitter 1, a tilt mirror 2, a beam splitter 3, a telescope secondary mirror 4, a telescope primary mirror 5, a laser receiving target 6, a corner cube prism 7, a dichroic mirror 8, a first lens 9, a laser detection camera 10, a second lens 11, a target detection camera 12 and a tilt mirror control unit 13;

[0023] The laser emitter 1 outputs the emitted laser to the tilt mirror 2, and the laser reflected by the tilt mirror 2 is incident on the beam splitter 3, and is split into two laser beams by the beam splitter 3;

[0024] The first laser beam reflected by the beam splitter 3 is transmitted to the telescope secondary mirror 4, and after being reflected by the telescope secondary mirror 4 and the telescope primary mirror 5 in sequence, it is emitted to the laser receiving target 6;

[0025] The second laser beam transmitted by the beam splitter 3 is transmitted to the corner cube prism 7, and after being reflected by the corner cube prism 7, it returns along the original direction, and after being reflected by the beam splitter 3 again, it is incident on the dichroic mirror 8, and after being reflected by the dichroic mirror 8, it is focused by the first lens 9 and enters the laser detection camera 10;

[0026] The light reflected from the laser receiving target 6 is reflected by the telescope primary mirror 5 and the telescope secondary mirror 4 in sequence, transmitted through the beam splitter 3 and the dichroic mirror 8, focused by the second lens 11, and then enters the target detection camera 12;

[0027] The laser detection camera 10 and the target detection camera 12 are both connected to the tilt mirror control unit 13, which collects the normalized imaging centroids of the laser detection camera 10 and the target detection camera 12. By controlling the tilt angle of the tilt mirror 2, the normalized imaging centroid of the laser detection camera 10 is always maintained at the floating zero point, so that the emitted laser can be accurately aimed at the laser receiving target.

[0028] The aiming method of the common optical path aiming system based on the floating zero point comprises the following steps:

[0029] First, the laser detection camera and target detection camera in the common optical path aiming system are calibrated. The calibration target is set at a fixed position. The common optical path aiming system and the calibration target are both in a static state. The optical path is adjusted to make the emitted laser incident on the calibration target, and the normalized imaging centroid (x 1-0 ,y 1-0 ) and the normalized imaging centroid of the target detection camera (x 2-0 ,y 2-0 );

[0030] Based on the calibrated common optical path aiming system, the actual target is aimed at, and the actual target is a static fixed target or a dynamic moving target. During the actual target aiming process, the tilt mirror control unit collects the normalized imaging centroid (x1, y1) of the laser detection camera and the normalized imaging centroid (x2, y2) of the target detection camera in real time, and controls the tilt angle of the tilt mirror to keep the normalized imaging centroid of the laser detection camera always at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ) to accurately aim the emitted laser at the actual target.

[0031] In the actual target aiming process, the tilt mirror control unit acquires the normalized imaging centroid (x1, y1) of the laser detection camera and the normalized imaging centroid (x2, y2) of the target detection camera in real time, and calculates x1 and (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0 ), if x1 is different from (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0) is greater than the set threshold, the tilt angle of the tilt mirror is adjusted until the normalized imaging center of mass of the laser detection camera is stably maintained at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ), where x1 and (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0 ) is less than the set threshold, the normalized imaging centroid of the laser detection camera is considered to be stable at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ).

[0032] If the traditional fixed zero point control method is used, on the one hand, an additional tilt mirror is required, and there is coupling between the two tilt mirrors; on the other hand, there may be a timing alignment error between the laser detection camera 10 and the target detection camera 12, resulting in an error in the tilt control. Experiments have shown that the traditional fixed zero point control method causes strong jitter in the laser at the laser receiving target 6 due to the above two problems. However, through analysis and verification, the improved floating zero point control method proposed in the present invention can greatly suppress the beam jitter, has obvious effects, and can enable the emitted laser to accurately aim at the actual target.

[0033] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. The common optical path aiming system based on floating zero point is characterized by: It includes a laser transmitter, a tilt mirror, a beam splitter, a telescope secondary mirror, a telescope primary mirror, a laser receiving target, a corner cube prism, a dichroic mirror, a first lens, a laser detection camera, a second lens, a target detection camera and a tilt mirror control unit; The laser transmitter outputs the laser to the tilt mirror, and the laser reflected by the tilt mirror is incident on the beam splitter, and is divided into two lasers by the beam splitter; The first laser beam reflected by the beam splitter is transmitted to the secondary mirror of the telescope, and then reflected by the secondary mirror and the primary mirror of the telescope, and then transmitted through the atmosphere to the laser receiving target. The second laser beam transmitted by the beam splitter is transmitted to the corner cube prism, and after being reflected by the corner cube prism, it returns along the original direction, and after being reflected by the beam splitter again, it enters the dichroic mirror, and after being reflected by the dichroic mirror, it is focused by the first lens and enters the laser detection camera; The light reflected from the laser receiving target is reflected by the telescope primary mirror and the telescope secondary mirror in turn, transmitted through the beam splitter and the dichroic mirror, focused by the second lens, and then enters the target detection camera; Both the laser detection camera and the target detection camera are connected to the tilt mirror control unit, which collects the normalized imaging centroids of the laser detection camera and the target detection camera. By controlling the tilt angle of the tilt mirror, the normalized imaging centroid of the laser detection camera is always kept at the floating zero point, so that the emitted laser can be accurately aimed at the laser receiving target.

2. The aiming method of the common optical path aiming system based on floating zero point according to claim 1, characterized in that: The following steps are involved: The laser detection camera and target detection camera in the common optical path aiming system are calibrated. The calibration target is set at a fixed position. The common optical path aiming system and the calibration target are both in a static state. The optical path is adjusted to make the emitted laser incident on the calibration target, and the normalized imaging centroid (x 1-0 ,y 1-0 ) and the normalized imaging centroid of the target detection camera (x 2-0 ,y 2-0 ); Determine the actual target, aim at the actual target based on the calibrated common optical path aiming system, the actual target is a static fixed target or a dynamic moving target. During the actual target aiming process, the tilt mirror control unit collects the normalized imaging centroid (x1, y1) of the laser detection camera and the normalized imaging centroid (x2, y2) of the target detection camera in real time, and controls the tilt angle of the tilt mirror to keep the normalized imaging centroid of the laser detection camera always at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ) to accurately aim the emitted laser at the actual target.

3. The aiming method of the common optical path aiming system based on floating zero point according to claim 2, characterized in that: In the actual target aiming process, the tilt mirror control unit acquires the normalized imaging centroid (x1, y1) of the laser detection camera and the normalized imaging centroid (x2, y2) of the target detection camera in real time, and calculates x1 and (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0 ), if x1 is different from (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0 ) is greater than the set threshold, the tilt angle of the tilt mirror is adjusted until the normalized imaging center of mass of the laser detection camera is stably maintained at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ), where x1 and (x 1-0 +x2-x 2-0 ) deviation, y1 and (y 1-0 +y2-y 2-0 ) is less than the set threshold, the normalized imaging centroid of the laser detection camera is considered to be stable at the floating zero point (x1=x 1-0 +x2-x 2-0 , y1=y 1-0 +y2-y 2-0 ).

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