A long-distance multi-spectral wide-space real-time visibility test system

Abstract

A long-distance multi-spectral band wide-space real-time visibility test system comprises a mobile station and a fixed station. The mobile station is a movable laser pulse emission target component, including a spherical cooperative target component and an unmanned aerial vehicle. The fixed station is a control center for laser pulse emission and a visibility solution center, comprising: a multi-spectral band laser, a multi-spectral band detector, a multi-spectral band laser energy meter, a signal processing device and a pointing control device. By setting the mobile station and the fixed station, real-time testing over a long distance and a large spatial range and active detection are realized. By setting the laser pulse emission target as the spherical cooperative target, all-round and all-angle measurement is realized. By setting the surface of the spherical cooperative target as a total reflection corner cube prism array, a large laser reflection area is also provided at a long distance, which is suitable for long-distance detection. By coating the extinction material on the unmanned aerial vehicle, measurement interference and error caused by reflection of the unmanned aerial vehicle are reduced, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of atmospheric visibility detection, and in particular relates to a long-distance multi-spectral band wide-space real-time visibility testing system. Background Art

[0002] The performance evaluation process of remote photoelectric detection equipment requires a direct, objective, quantitative, real-time, large-scale, multi-spectral atmospheric channel visibility evaluation means and methods. In the performance test and evaluation process of remote photoelectric detection equipment, according to the photoelectric detection equation, there are two uncertain factors, one is the target characteristics, and the other is the atmospheric channel characteristics, especially the visibility of the atmospheric channel, which is the transmittance for the optical system, and has a huge impact on the performance evaluation of the system. Especially for the visibility / transmittance of the long-distance atmospheric channel, the dynamic gap is large, and the gap can reach several orders of magnitude; time sensitivity, the atmospheric channel visibility at the same position and the same direction at different times will be very different; space sensitivity, at the same time, the atmospheric channel visibility at different azimuths and different zenith angles is very different; the calculation results of the existing atmospheric simulation software are too different from the actual situation. Therefore, real-time measurement of atmospheric visibility in different angle ranges is a necessary condition for the performance test and evaluation of ground-to-air remote photoelectric detection equipment.

[0003] When the target is far away from the laser radar, the spot area of ​​the laser beam on the target is usually larger than the effective reflection area of ​​the target, and the target surface intercepts the laser beam completely. In this case (diffuse reflection small target), the laser ranging equation is:

[0004]

[0005] Where:

[0006] Pr——echo laser power (W);

[0007] Ps——the emission power of the laser light source (W);

[0008] τa——one-way transmittance of atmosphere;

[0009] τr——transmittance of laser receiving optical system;

[0010] θ——Laser beam divergence angle (mrad);

[0011] ε——aiming error;

[0012] R——target distance (km);

[0013] ρ——target reflection coefficient;

[0014] A d ——Target equivalent reflection cross-sectional area (m 2 );

[0015] D0——Entrance pupil diameter of the laser receiving optical system (mm).

[0016] Among them, the uncertain parameters are mainly the reflection characteristics of the target and the transmittance and visibility of the atmospheric channel.

[0017] Affected by atmospheric extinction caused by solid and liquid particles suspended in the atmosphere, atmospheric visibility is a complex psychophysical phenomenon. In the application of photoelectric detection system performance, the accuracy of atmospheric visibility is directly related to the performance evaluation and assessment in actual testing, especially the determination of visibility parameters for real-time, long-distance (≥20km), commonly used detection spectrum (visible light, near infrared, medium-wave infrared), and large viewing angle (360° in azimuth, zenith angle range ≥90°). However, the existing visibility measurement methods cannot meet the needs of remote ground-to-air photoelectric active and passive detection systems for direct testing of atmospheric visibility parameters in real time, long distance, wide spectrum, and large spatial range. The valuation of them in the existing technology is also affected by the characteristics of the light source and the transmittance, and depends on personal vision and the level of understanding of visibility. It can be seen that the visual estimation of visibility is subjective, and the traditional visibility observation methods can no longer meet the needs of photoelectric equipment testing.

[0018] Therefore, there is an urgent need to design a long-distance, multi-spectral, wide-space real-time visibility test system or method that can obtain the atmospheric visibility parameters in the airspace where the target appears in real time to meet the needs of performance evaluation of ground-to-air long-range active and passive optoelectronic detection systems. Summary of the invention

[0019] In order to solve the above technical problems, the present application provides a long-distance multi-spectral wide-space real-time visibility test system, including a mobile station and a fixed station.

[0020] The mobile station is a movable laser pulse emission target, comprising:

[0021] a spherical cooperative target element, used to reflect the laser pulses emitted by the fixed station;

[0022] A drone, used for hanging the spherical cooperation target part for movement, and transmitting the spatial position information of the spherical cooperation target part back to the fixed station;

[0023] The fixed station is the control center for laser pulse emission and the visibility calculation center, including:

[0024] A multi-spectral laser, used for emitting multi-spectral laser pulses;

[0025] A multi-spectral detector, used for receiving multi-spectral laser pulse echo photon signals reflected by the spherical cooperative target;

[0026] Multi-spectral laser energy meter, used to measure the output energy of multi-spectral laser pulses;

[0027] A signal processing device, used for receiving the spatial position information transmitted back by the UAV, receiving the multi-spectral laser pulse echo photon signal, and calculating the echo intensity of the spherical cooperative target part through the received information, solving the pointing angle of the pointing control device, obtaining the distance between the spherical cooperative target part and the fixed station and the multi-spectral visibility of the fixed station and the mobile station;

[0028] A pointing control device, used for carrying the multi-spectral laser, the multi-spectral detector, the multi-spectral laser energy meter and the signal processing device, and performing a long-distance multi-spectral wide-space real-time visibility test according to the pointing angle calculated by the signal processing device;

[0029] The long-distance multi-spectral wide-space real-time visibility test comprises:

[0030] Implementing optical axis correction, including: the pointing control device adjusts the optical axis positions of the multi-spectral laser, the multi-spectral detector and the multi-spectral laser energy meter according to the pointing angle, so that the optical axis points to the spherical cooperative target part;

[0031] Starting the test signal sending, including: the multi-spectral laser emits a multi-spectral laser pulse to the spherical cooperative target, and the multi-spectral detector receives the multi-spectral laser pulse echo photon signal;

[0032] Implementing a multi-spectral visibility test includes: based on the multi-spectral laser pulse echo photon signal and the light output energy measured by the multi-spectral laser energy meter, the signal processing device performs visibility calculation to obtain the multi-spectral visibility between the fixed station and the mobile station.

[0033] Furthermore, a total reflection corner cube prism array is distributed on the surface of the spherical cooperative target piece, and a heating device is arranged inside.

[0034] Furthermore, the effective light transmission size of the total reflection corner cube prism is ≤ 1 / 10 of the diameter of the spherical cooperative target component.

[0035] Furthermore, the drone includes a first data transmission module and a positioning module, the positioning module is used to locate the spatial position of the spherical cooperation target part, and the first data transmission module is used to transmit the spatial position of the spherical cooperation target part back to the fixed station.

[0036] Furthermore, the surface of the drone is coated with a matte material to reduce or eliminate the effect of reflected laser on the drone, and the matte material includes matte paint.

[0037] Furthermore, the multi-spectral laser, the multi-spectral detector and the multi-spectral laser energy meter are also provided with an optical system, and the optical system adopts a co-optical axis design to achieve consistent pointing of the optical system.

[0038] Furthermore, the multi-spectral bands include mid-wave infrared, near-infrared and visible light, the mid-wave infrared spectrum range is 2500nm to 5500nm, the near-infrared spectrum range is 800nm ​​to 2500nm, and the visible light spectrum range is 400nm to 800nm.

[0039] Furthermore, according to the different spectral ranges, a medium-wave infrared laser, a medium-wave infrared detector and a medium-wave infrared laser energy meter are placed in the middle of the carrying surface of the pointing control device, a visible light laser, a visible light single photon detector and a visible light laser energy meter are placed on the left side of the carrying surface, and a near-infrared laser, a near-infrared single photon detector and a near-infrared laser energy meter are placed on the right side of the carrying surface.

[0040] Furthermore, the signal processing device includes a second data transmission module and a positioning and orientation module, the second data transmission module is used to exchange information with the drone, and the positioning and orientation module is used to locate and orient the positions of the optical axes of the multi-spectral laser, multi-spectral detector and multi-spectral laser energy meter.

[0041] Further, the performing of the long-distance multi-spectral wide-space real-time visibility test also includes:

[0042] Before the optical axis correction is implemented, the drone suspends the spherical cooperative target component to arrive at a designated test position;

[0043] When the start test signal is sent, the first data transmission module of the drone transmits the spatial position information of the spherical cooperation target to the second data transmission module of the signal processing device, and at the same time, the positioning and orientation module of the signal processing device determines the positioning and orientation information of the optical axis; the signal processing device calculates the pointing angle of the pointing control device to the spherical cooperation target according to the spatial position information and the positioning and orientation information, and sends a corresponding steering instruction to the pointing control device;

[0044] After the start test signal is sent, the pointing control device turns the optical axis to point to the spherical cooperation target, the multi-spectral laser emits multi-spectral laser pulses to the spherical cooperation target, the multi-spectral laser energy meter measures the light output energy of the multi-spectral laser, the multi-spectral detector receives the echo photon signal reflected from the surface of the spherical cooperation target, and sends the echo photon signal to the signal processing device;

[0045] The visibility solution means that according to the light output energy and the echo photon signal, the signal processing device uses the laser radar equation to obtain the distance between the spherical cooperative target and the fixed station, thereby obtaining the multi-spectral visibility between the fixed station and the mobile station.

[0046] The beneficial effects of the present invention are as follows: by setting the mobile station and the fixed station, real-time testing over a long distance and a large spatial range is achieved, and active detection is achieved; by setting the laser pulse emission target as the spherical cooperative target, all-round and all-angle measurement is achieved; by setting the surface of the spherical cooperative target as a total reflection corner cube prism array, the laser reflection cross-section does not change with changes in the measurement angle and external temperature, and a large laser reflection area is also available at a long distance, which is suitable for long-distance detection, making the reflection collected data more accurate and effective, and improving the accuracy of the test results; by coating the extinction material on the drone, the measurement interference and error caused by the reflection of the drone is reduced, and the measurement accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of a total reflection corner cube prism according to an embodiment of the present invention;

[0048] Figure 2 is a schematic diagram of a spherical cooperative target component according to an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of the structure of a mobile station according to an embodiment of the present invention;

[0050] Figure 4 is a schematic diagram of a fixed station structure according to an embodiment of the present invention;

[0051] Figure 5 is a schematic diagram of a visible light laser energy meter according to an embodiment of the present invention;

[0052] Figure 6 is a schematic diagram of a near-infrared laser energy meter according to an embodiment of the present invention;

[0053] Figure 7 is a schematic diagram of a medium-wave infrared laser energy meter according to an embodiment of the present invention;

[0054] Figure 8 is a schematic diagram of a long-distance multi-spectral wide-space real-time visibility testing system according to an embodiment of the present invention;

[0055] Explanation of the accompanying figures: 1-spherical cooperative target; 2-unmanned aerial vehicle; 3-first data transmission module; 4-pointing control equipment; 5-visible light laser; 6-visible light single photon detector; 7-visible light laser energy meter; 8-medium-wave infrared laser; 9-medium-wave infrared detector; 10-medium-wave infrared laser energy meter; 11-near-infrared laser; 12-near-infrared single photon detector; 13-near-infrared laser energy meter; 14-signal processing equipment; 15-mobile station; 16-fixed station. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0057] The embodiment of the present invention provides a long-distance multi-spectral wide-space real-time visibility test system to solve the problem that the existing long-distance atmospheric visibility test relies on inference and has no direct measurement means, and cannot meet the needs of long-distance ground-to-air optoelectronic active and passive detection systems for direct testing of atmospheric visibility parameters in real time, long distance, wide spectrum, and large spatial range. Figure 1 -Attached Figure 8 The specific implementation of the present invention is described in detail.

[0058] like Figure 8 As shown, the embodiment of the present invention provides a long-distance multi-spectral wide-space real-time visibility test system, including a mobile station 15 and a fixed station 16.

[0059] The mobile station 15 is a movable laser pulse emission target, including a spherical cooperative target 1 and a drone 2. The mobile station 15 is as follows: Figure 3 As shown;

[0060] The spherical cooperative target element 1, such as Figure 2 As shown, it is used to reflect the laser pulse emitted by the fixed station 16. The surface of the spherical cooperative target part 1 is distributed with a total reflection corner cube prism array, which can realize total laser reflection. The total reflection corner cube prism array has a large laser reflection cross-section and can reflect in all directions and in all spectral bands. The laser reflection characteristics are measurable, known and controllable. The spherical cooperative target part 1 is provided with a heating device inside to control the temperature of the spherical cooperative target part 1, which is conducive to forming a medium-wave infrared tracking target and realizing all-round and all-angle measurement. The total reflection corner cube prism array is set so that the laser reflection cross-section does not change with the change of the measurement angle and the external temperature. It also has a large laser reflection area at a long distance, which is suitable for long-distance detection, so that the reflection collection data is more accurate and effective, and the accuracy of the test results is improved.

[0061] The effective light transmission size of the total reflection corner cube prism is ≤ 1 / 10 of the diameter of the spherical cooperative target element 1. Figure 1 shown.

[0062] The drone 2 is used to suspend the spherical cooperation target part 1 for movement, and transmit the spatial position information of the spherical cooperation target part 1 to the fixed station 16. The drone 2 is a hovering drone equipped with data transmission, which can realize long-distance full airspace movement, 360° azimuth, 0°~90° zenith angle, horizontal distance ≥20km and vertical distance ≥5km, realize long-distance and large spatial range real-time testing, and realize active detection;

[0063] The drone 2 includes a first data transmission module 3 and a positioning module, wherein the positioning module is used to locate the spatial position of the spherical cooperation target part 1, and the first data transmission module 3 is used to transmit the spatial position of the spherical cooperation target part 1 back to the fixed station 16 to realize real-time testing;

[0064] The surface of the drone 2 is coated with a matte material to reduce or eliminate the influence of the reflected laser of the drone 2. The matte material includes a matte paint. The drone 2 has a low reflection characteristic, and its wide spectrum reflectivity is less than 3%. The wide spectrum is 450nm to 5500nm, which can reduce the measurement interference and error caused by the reflection of the drone 2 and improve the measurement accuracy.

[0065] The total reflection micro-corner prism of the spherical cooperative target part 1 achieves high reflectivity for the wide-spectrum light waves, and its reflectivity is ≥95%; the working angles of adjacent total reflection micro-corner prisms overlap to achieve seamless connection of all spatial angles; the total reflection micro-corner prisms distributed on the surface of the spherical cooperative target part 1 achieve omnidirectional reflection of laser pulses incident from any direction, realizing all-round, full-angle and wide-spectrum measurement.

[0066] The fixed station 16 is a control center for laser pulse emission and a visibility calculation center, including: a multi-spectral laser, a multi-spectral detector, a multi-spectral detector, a signal processing device 14 and a pointing control device 4. The fixed station 16 is as follows: Figure 4 As shown;

[0067] The multi-spectral bands include mid-wave infrared, near-infrared and visible light, the mid-wave infrared spectrum ranges from 2500nm to 5500nm, the near-infrared spectrum ranges from 800nm ​​to 2500nm, and the visible light spectrum ranges from 400nm to 800nm;

[0068] The multi-spectral laser is used to emit multi-spectral laser pulses. The multi-spectral laser includes a medium-wave infrared laser 8, a near-infrared laser 11 and a visible light laser 5. The medium-wave infrared laser 8 emits laser pulses in the medium-wave infrared band to the spherical cooperative target 1, the near-infrared laser 11 emits laser pulses in the near-infrared band to the spherical cooperative target 1, and the visible light laser 5 emits laser pulses in the visible light band to the spherical cooperative target 1;

[0069] The multi-spectral detector is used to receive the multi-spectral laser pulse echo photon signal reflected by the spherical cooperative target 1, and the multi-spectral detector includes a medium-wave infrared detector 9, a near-infrared single-photon detector 12 and a visible light single-photon detector 6;

[0070] The medium-wave infrared detector 9 receives the medium-wave radiation energy reflected by the spherical cooperative target 1, and detects the infrared radiation image of the target itself to detect the echo intensity information of the spherical cooperative target 1. After the image is processed by the signal processing device 14, the spherical cooperative target 1 is detected and tracked, and the off-target amount of the spherical cooperative target 1 relative to the optical axis is provided to the pointing control device 4, and the status information of the spherical cooperative target 1 is sent to the signal processing device 14;

[0071] The near-infrared single-photon detector 12 is used to detect the near-infrared laser pulse signal reflected by the spherical cooperative target 1, obtain the near-infrared echo photon signal reflected by the spherical cooperative target 1, and send the state information of the spherical cooperative target 1 to the signal processing device 14;

[0072] The visible light single photon detector 6 detects the visible light laser pulse signal reflected by the spherical cooperative target 1, obtains the visible light echo photon signal reflected by the spherical cooperative target 1, and sends the state information of the spherical cooperative target 1 to the signal processing device 14;

[0073] The multi-spectral laser energy meter is used to measure or calibrate the light output energy of the multi-spectral laser pulse, test and monitor the laser pulse energy of the medium-wave infrared laser 8, the near-infrared laser 11 and the visible light laser 5, and send the light output pulse energy information of the medium-wave infrared laser 8, the near-infrared laser 11 and the visible light laser 5 to the signal processing device 14, which is used as the light output energy parameter calculated by the laser radar equation. The multi-spectral laser energy meter includes a medium-wave infrared laser energy meter 10, a near-infrared laser energy meter 13 and a visible light laser energy meter 7. The visible light laser energy meter 7 is as shown in FIG. Figure 5 As shown, the near-infrared laser energy meter 13 is as follows Figure 6 As shown, the medium-wave infrared laser energy meter 10 is as follows Figure 7 As shown;

[0074] According to the different spectral ranges, the medium-wave infrared laser 8, the medium-wave infrared detector 9 and the medium-wave infrared laser energy meter 10 are placed in the middle of the carrying surface of the pointing control device 4, the visible light laser 5, the visible light single photon detector 6 and the visible light laser energy meter 7 are placed on the left side of the carrying surface, and the near-infrared laser 11, the near-infrared single photon detector 12 and the near-infrared laser energy meter 13 are placed on the right side of the carrying surface.

[0075] The multi-spectral laser, multi-spectral detector and multi-spectral laser energy meter are also provided with an optical system, and the optical system adopts a co-optical axis design to achieve consistent pointing of the optical system.

[0076] The signal processing device 14 is used to receive the spatial position information transmitted back by the drone 2, receive the multi-spectral laser pulse echo photon signal, and calculate the echo intensity of the spherical cooperation target 1 through the received information, solve the pointing angle of the pointing control device 4, and obtain the real-time transmittance and visibility of the atmospheric channel at the line-of-sight distance between the spherical cooperation target 1 and the fixed station 16 in different spectral bands, that is, to obtain the distance between the spherical cooperation target 1 and the fixed station 16 and the multi-spectral visibility of the fixed station 16 and the mobile station 15;

[0077] The real-time transmittance and visibility of the atmospheric channel at the line-of-sight distance between the spherical cooperative target 1 and the fixed station 16 in different spectral bands are obtained by bringing the spatial position information of the spherical cooperative target 1 received by the signal processing device 14, the multi-spectral laser pulse echo photon signal information reflected from the surface of the spherical cooperative target 1 received by the multi-spectral detector, and the light output energy information of the laser pulse of the multi-spectral laser into the laser radar equation for comprehensive solution;

[0078] The signal processing device 14 includes a second data transmission module and a positioning and orientation module. The second data transmission module is used to exchange information with the drone 2 to realize the sending and receiving of motion control instructions such as the spatial position information and moving distance angle of the spherical cooperative target part 1. The positioning and orientation module is used to locate and orient the positions of the optical axes of the multi-spectral laser, multi-spectral detector and multi-spectral laser energy meter.

[0079] The pointing control device 4 is used to carry the multi-spectral laser, the multi-spectral detector, the multi-spectral laser energy meter and the signal processing device 14, and perform a long-distance multi-spectral wide-space real-time visibility test according to the pointing angle solved by the signal processing device 14;

[0080] The long-distance multi-spectral wide-space real-time visibility test comprises:

[0081] Implementing optical axis correction, including: the pointing control device 4 adjusts the optical axis positions of the multi-spectral laser, the multi-spectral detector and the multi-spectral laser energy meter according to the pointing angle, so that the optical axis points to the spherical cooperative target part 1;

[0082] Before the optical axis correction is implemented, the drone 2 suspends the spherical cooperation target part 1 to arrive at a designated test position, which is more than 1 km away from the fixed station 16, and simultaneously the spatial position of the spherical cooperation target part 1 is located by the positioning module of the drone 2;

[0083] Starting the test signal sending, including: the multi-spectral laser emits a multi-spectral laser pulse to the spherical cooperative target 1, and the multi-spectral detector receives the multi-spectral laser pulse echo photon signal;

[0084] When the start test signal is sent, the first data transmission module 3 of the drone 2 transmits the spatial position information of the spherical cooperation target 1 to the second data transmission module of the signal processing device 14, and at the same time, the positioning and orientation module of the signal processing device 14 determines the positioning and orientation information of the optical axis; the signal processing device 14 calculates the pointing angle of the pointing control device 4 to the spherical cooperation target 1 according to the spatial position information and the positioning and orientation information, and sends a corresponding steering instruction to the pointing control device 4;

[0085] After the start test signal is sent, the pointing control device 4 turns the optical axis to point to the spherical cooperation target 1, the multi-spectral laser emits multi-spectral laser pulses to the spherical cooperation target 1, the multi-spectral laser energy meter measures the light output energy of the multi-spectral laser, the multi-spectral detector receives the echo photon signal reflected from the surface of the spherical cooperation target 1, and sends the echo photon signal to the signal processing device 14;

[0086] Implementing a multi-spectral visibility test includes: the signal processing device 14 performs visibility calculation based on the multi-spectral laser pulse echo photon signal and the light output energy measured by the multi-spectral laser energy meter to obtain the multi-spectral visibility between the fixed station 16 and the mobile station 15.

[0087] The visibility solution refers to: based on the spatial position information of the spherical cooperation target 1, according to the light output energy and the echo photon signal, the signal processing device 14 uses the laser radar equation to obtain the distance between the spherical cooperation target 1 and the fixed station 16, thereby obtaining the real-time transmittance and visibility of the atmospheric channel at the line-of-sight distance between the spherical cooperation target 1 and the fixed station 16 in different spectral bands, that is, obtaining the multi-spectral visibility between the fixed station 16 and the mobile station 15.

[0088] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A long-distance multi-spectral wide-space real-time visibility test system, characterized in that: comprising a mobile station (15) and a fixed station (16), The mobile station (15) is a movable laser pulse emission target, comprising: A spherical cooperative target (1) for reflecting laser pulses emitted by the fixed station (16); A drone (2) is used to suspend the spherical cooperation target part (1) for movement and to transmit spatial position information of the spherical cooperation target part (1) back to the fixed station (16); The fixed station (16) is a control center for laser pulse emission and a visibility calculation center, and includes: A multi-spectral laser, used for emitting multi-spectral laser pulses; A multi-spectral detector, used for receiving the multi-spectral laser pulse echo photon signal reflected by the spherical cooperative target (1); Multi-spectral laser energy meter, used to measure the output energy of multi-spectral laser pulses; A signal processing device (14) is used to receive the spatial position information transmitted back by the drone (2), receive the multi-spectral laser pulse echo photon signal, and calculate the echo intensity of the spherical cooperative target (1) based on the received information, calculate the pointing angle of the pointing control device (4), obtain the distance between the spherical cooperative target (1) and the fixed station (16), and the multi-spectral visibility of the fixed station (16) and the mobile station (15); The pointing control device (4) is used to carry the multi-spectral laser, the multi-spectral detector, the multi-spectral laser energy meter and the signal processing device (14), and perform a long-distance multi-spectral wide-space real-time visibility test according to the pointing angle calculated by the signal processing device (14); The long-distance multi-spectral wide-space real-time visibility test comprises: The optical axis correction is realized, comprising: the pointing control device (4) adjusts the optical axis positions of the multi-spectral laser, the multi-spectral detector and the multi-spectral laser energy meter according to the pointing angle, so that the optical axis points to the spherical cooperative target part (1); Starting the test signal transmission, comprising: the multi-spectral laser emitting a multi-spectral laser pulse to the spherical cooperative target (1), and the multi-spectral detector receiving the multi-spectral laser pulse echo photon signal; A multi-spectral visibility test is implemented, comprising: based on the spatial position information of the spherical cooperative target (1), according to the light output energy and the echo photon signal, the signal processing device (14) uses a laser radar equation to obtain the distance between the spherical cooperative target (1) and the fixed station (16), thereby obtaining the real-time transmittance and visibility of the atmospheric channel at the line-of-sight distance between the spherical cooperative target (1) and the fixed station (16) in different spectral bands, that is, obtaining the multi-spectral visibility between the fixed station (16) and the mobile station (15).

2. The long-distance multi-spectral wide-space real-time visibility test system according to claim 1, characterized in that: The surface of the spherical cooperative target element (1) is distributed with a total reflection corner cube prism array, and a heating device is arranged inside.

3. The long-distance multi-spectral wide-space real-time visibility testing system according to claim 2, characterized in that: The effective light transmission size of the total reflection corner cube prism is ≤ 1 / 10 of the diameter of the spherical cooperative target component (1).

4. The long-distance multi-spectral wide-space real-time visibility testing system according to claim 1, characterized in that: The drone (2) comprises a first data transmission module (3) and a positioning module, wherein the positioning module is used to locate the spatial position of the spherical cooperation target part (1), and the first data transmission module (3) is used to transmit the spatial position of the spherical cooperation target part (1) back to the fixed station (16).

5. The long-distance multi-spectral wide-space real-time visibility test system according to claim 4, characterized in that: The surface of the drone (2) is coated with a matte material for reducing or eliminating the effect of laser reflection on the drone (2), and the matte material comprises matte paint.

6. The long-distance multi-spectral wide-space real-time visibility testing system according to claim 1, characterized in that: The multi-spectral laser, multi-spectral detector and multi-spectral laser energy meter are also provided with an optical system, and the optical system adopts a co-optical axis design to achieve consistent pointing of the optical system.

7. The long-distance multi-spectral wide-space real-time visibility testing system according to claim 6, characterized in that: The multi-spectral bands include mid-wave infrared, near-infrared and visible light. The mid-wave infrared spectrum ranges from 2500nm to 5500nm, the near-infrared spectrum ranges from 800nm ​​to 2500nm, and the visible light spectrum ranges from 400nm to 800nm.

8. The long-distance multi-spectral wide-space real-time visibility testing system according to claim 7, characterized in that: According to the different spectral ranges, a medium-wave infrared laser (8), a medium-wave infrared detector (9) and a medium-wave infrared laser energy meter (10) are placed in the middle of the bearing surface of the pointing control device (4), a visible light laser (5), a visible light single-photon detector (6) and a visible light laser energy meter (7) are placed on the left side of the bearing surface, and a near-infrared laser (11), a near-infrared single-photon detector (12) and a near-infrared laser energy meter (13) are placed on the right side of the bearing surface.

9. The long-distance multi-spectral wide-space real-time visibility test system according to claim 4, characterized in that: The signal processing device (14) comprises a second data transmission module and a positioning and orientation module, wherein the second data transmission module is used to exchange information with the drone (2), and the positioning and orientation module is used to locate and orient the positions of the optical axes of the multi-spectral laser, the multi-spectral detector and the multi-spectral laser energy meter.

10. The long-distance multi-spectral wide-space real-time visibility test system according to claim 9, characterized in that: The performing of long-distance multi-spectral wide-space real-time visibility test also includes: Before the optical axis correction is implemented, the drone (2) hangs the spherical cooperative target part (1) to arrive at a designated test position; When the start test signal is sent, the first data transmission module (3) of the drone (2) transmits the spatial position information of the spherical cooperative target (1) back to the second data transmission module of the signal processing device (14), and at the same time, the positioning and orientation module of the signal processing device (14) determines the positioning and orientation information of the optical axis; the signal processing device (14) calculates the pointing angle of the pointing control device (4) to the spherical cooperative target (1) based on the spatial position information and the positioning and orientation information, and sends a corresponding steering instruction to the pointing control device (4); After the start test signal is sent, the pointing control device (4) turns the optical axis to point toward the spherical cooperative target part (1), the multi-spectral laser emits multi-spectral laser pulses to the spherical cooperative target part (1), the multi-spectral laser energy meter measures the light output energy of the multi-spectral laser, and the multi-spectral detector receives the echo photon signal reflected from the surface of the spherical cooperative target part (1), and sends the echo photon signal to the signal processing device (14).

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