Common-caliber receiving long-wave infrared and GM-APD laser composite long-distance imaging device

Abstract

The invention discloses a common-caliber receiving long-wave infrared and GM-APD laser composite long-distance imaging device, and relates to the technical field of long-distance laser three-dimensional imaging. The method is used for solving the problem that an existing composite detection technology does not have the long-distance detection capacity in a near space or an outer space. The long-wave infrared and GM-APD laser radar composite detection mode is adopted, long-distance target array imaging not lower than 97 Km is achieved, and the imaging frame frequency can reach 10 Hz. The method specifically comprises the following steps of: improving a situation awareness action distance by adopting long-wave infrared imaging detection, and realizing accurate measurement and tracking of a target in a middle-short distance by adopting a GM-APD laser imaging detection technology; through long-wave infrared / GM-APD laser common-path fusion optical detection technology research, optical-mechanical system optimization layout, multi-dimensional information fusion perception and accurate identification measurement are realized. The method can be used in composite imaging fields such as long-distance target detection and identification, airborne topographic surveying and mapping, satellite-borne ground detection and the like.

Description

Technical Field

[0001] The invention relates to the technical field of long-distance laser three-dimensional imaging, and in particular to a common-aperture receiving long-wave infrared and GM-APD laser composite long-distance imaging device. Background Art

[0002] At present, the longest detection distance of long-distance laser 3D imaging was achieved by the team of Xu Feihu of the University of Science and Technology of China, which used a single-point scanning single-photon laser radar to achieve target detection of 200km snow-capped mountains. This technology mainly uses single-point scanning, and the reconstruction of a single image takes a long time, and it does not have real-time imaging capabilities.

[0003] In terms of composite detection technology, the current mainstream technology is to use GM-APD laser radar and medium-wave infrared (medium-wave cooling imaging 3-5um) composite detection imaging. In the sun-irradiated area, the effective distance of medium-wave cooling imaging can reach more than 200km, and in the earth's shadow area, the effective distance is about 22km. The farthest detection distance achieved by this composite imaging technology is tens of kilometers, and it does not have the ability to detect long distances in near space or outer space. Summary of the invention

[0004] The present invention is used to solve the problem that the existing composite detection technology does not have the ability of long-distance detection in near space or outer space, and thus proposes a long-wave infrared and GM-APD laser composite long-distance imaging device with a common aperture reception.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a long-wave infrared and GM-APD laser composite long-distance imaging device for common aperture reception, the imaging device comprising a long-wave infrared imaging detection component, a GM-APD laser imaging detection component, and a common aperture receiving optical component;

[0007] The long-wave infrared imaging detection component is used to detect and image the target at a long distance. It is also used to detect, image and track the target at a medium distance in combination with the GM-APD laser imaging detection component to obtain the relative position relationship with the target. It is also used to identify the category and local key parts of non-cooperative targets and realize the measurement of target parameters in combination with the GM-APD laser imaging detection component at a close distance through a composite multi-dimensional information fusion method;

[0008] The common aperture receiving optical component is used to align the imaging field of view of the long-wave infrared imaging detection component and the GM-APD laser imaging detection component.

[0009] Furthermore, ≥90km is long distance, 90km~2km is medium distance, and 2km~200m is short distance.

[0010] Furthermore, there is a preferred embodiment, the above-mentioned common aperture receiving optical component is implemented by an off-axis two-mirror optical receiving system. The off-axis two-mirror optical receiving system includes two-mirror adjustable reflector group, long-wave infrared reflector, beam splitter, laser reflector, linear polarizer, variable iris, narrow-band filter;

[0011] The laser reflector, linear polarizer, variable aperture and narrow-band filter are sequentially arranged at the front end of the GM-APD laser imaging detection assembly;

[0012] The long-wave infrared reflector is used to send incident light in the long-wave infrared band to the long-wave infrared imaging detection component;

[0013] The two anti-adjustable reflector groups are used to reflect the incident light onto the laser reflector through two free-form surface optical mirrors;

[0014] The laser reflector is used to project the laser of 1064nm band onto the linear polarizer, and is also used to reflect the light of other bands onto the beam splitter prism;

[0015] The beam splitter prism is arranged between the long-wave infrared reflector and the laser reflector for repeatedly performing beam splitting processing on the incident light, sending the laser in the 1064nm band to the laser reflector and sending the incident light in the long-wave infrared band to the long-wave infrared reflector.

[0016] Furthermore, the laser reflector and the long-wave infrared reflector are both provided with a reduced reflection film and a high reflection medium film;

[0017] The anti-reflection film is used to ensure at least 99.5% transmittance, and the high-reflection dielectric film is used to ensure at least 97% reflectivity.

[0018] Furthermore, the two free-form surface optical mirrors are both off-axis paraboloids.

[0019] The present invention also provides a free-form surface optical parameter design method based on a deep reinforcement learning algorithm, the design method is used to design the parameters of any of the above-mentioned common aperture receiving optical components, the method is:

[0020] Step 1: Establish the initial system, design constraints and system optimization environment, and define the empty Q table, ε value and the end state of the optimization process;

[0021] Step 2: Initialize the current state number i=1, the current design step number ω=1, and the current data set number k=1;

[0022] Step 3: The design process reaches the i-th state S i , the current event number is k, and the total number of operations that can be performed in this state is N i ;

[0023] Step 4: Check if S exists in the Q table i , if it exists, get all action values ​​Q π (S i ,a j )(j=1...N i ), if it does not exist, replace S i Add to the Q table and set all action values ​​Q π (S i ,a j )(j=1...N i ) is initialized to zero;

[0024] Step 5: Find Q π (S i ,a j )(j=1...N i ) is the action with the largest action value a * ;

[0025] Step 6: If the end state is reached, the current episode is completed, and the reward value R of the current system is evaluated;

[0026] Step 7: Repeat the above steps until the maximum number of sets k is reached max , as the optimal structural parameters.

[0027] Furthermore, the above ε value is a number between 0 and 1.

[0028] The method for designing optical parameters of free-form surfaces based on deep reinforcement learning algorithm described in the present invention can be fully implemented by computer software. Therefore, correspondingly, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the method for designing optical parameters of free-form surfaces based on deep reinforcement learning algorithm described above is executed.

[0029] The present invention also provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the above-mentioned free-form surface optical parameter design method based on deep reinforcement learning algorithm.

[0030] The beneficial effects of the present invention are:

[0031] 1. Aiming at the current inadequacy of the real-time and accurate perception capability of the situation of long-distance targets, the present invention adopts a composite detection method of long-wave infrared and GM-APD laser radar to achieve array imaging of long-distance targets of not less than 97 km, and the imaging frame rate can reach 10Hz. Specifically: the situation awareness range is improved by adopting long-wave infrared imaging detection, the accurate measurement and tracking of targets at medium and short distances is achieved by adopting GM-APD laser imaging detection technology, and the optimization layout of the optical-mechanical system and the multi-dimensional information fusion perception and accurate identification measurement are achieved by studying the long-wave infrared / GM-APD laser common optical path fusion optical detection technology.

[0032] Furthermore, the present invention also adopts a co-aperture long-wave infrared and GM-APD laser receiving optical system with a dual-reflection structure to meet the co-aperture reception of long-wave and 1064nm lasers, while having miniaturized design capabilities.

[0033] 2. The composite optical receiving system needs to meet the condition that the laser and the infrared central field of view are aligned, and efficiently receive 8.6-9.7μm long-wave infrared and 1064nm lasers. At the same time, it must also have the ability to efficiently separate the spectra of the two received wavelength ranges. This is the challenge faced by the entire composite optical system. To address this problem, the present invention adopts a common-aperture receiving optical system to achieve the alignment of the laser and the long-wave infrared central imaging field of view; and uses a deep reinforcement learning algorithm to complete the off-axis two-reflection free-form surface optical design. Through optimized design, the common-aperture optical receiving system can achieve high-efficiency reception of 8.6-9.7μm long-wave infrared and 1064nm lasers.

[0034] Furthermore, compared with the prior art, the effective distance of the present invention in the sun-irradiated area can reach more than 250km, and the effective distance in the earth's shadow area is more than 82km, which is far beyond the distance of the existing GM-APD laser radar and medium-wave infrared composite detection imaging.

[0035] The present invention is used for high-resolution detection and precise perception and identification of long-distance targets. It uses a composite detection method of long-wave infrared and GM-APD laser radar with common aperture reception to detect, identify and measure targets within a range of 200m to 100km, thereby improving the ability to accurately perceive targets. It can be used in composite imaging fields such as long-distance target detection and identification, airborne terrain mapping, and satellite-borne ground detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural diagram of the long-wave infrared and laser co-aperture receiving optical system components of the present invention;

[0038] Figure 2 It is the optical path diagram of the long-wave infrared and laser co-aperture receiving optical system of the present invention;

[0039] Figure 3 is the optical path diagram of the long-wave infrared channel of the present invention;

[0040] Figure 4 is a light path diagram of the laser channel of the present invention;

[0041] Figure 5 is an initial simulation diagram of the common aperture receiving optical system of the present invention;

[0042] Figure 6 is a simulation diagram of the optimized common aperture receiving optical system of the present invention;

[0043] Figure 7 It is the 27km mountain common aperture long wave infrared and GM-APD laser three-dimensional imaging described in the present invention;

[0044] Figure 8 It is the 48km mountain common aperture long wave infrared and GM-APD laser three-dimensional imaging described in the present invention;

[0045] Fig. 9 These are the indoor test scenes and results of the maximum laser detection distance described in the present invention, wherein Figure (a) is the three-dimensional imaging result when OD=5.5, Figure (b) is the three-dimensional imaging result when OD=5.8, and Figure (c) is the three-dimensional imaging result when OD=6.0.

[0046] Among them, 1 represents the first off-axis two-reflecting receiving free-form surface optical lens, 2 represents the second off-axis two-reflecting receiving free-form surface optical lens, 3 represents a beam splitter prism, 4 represents a linear polarizer, 5 represents a variable aperture, 6 represents a narrow-band filter, 7 represents a long-wave infrared imaging detection component, 8 represents a GM-APD laser detection component, 9 represents a long-wave infrared reflector, and 10 represents a laser reflector. DETAILED DESCRIPTION

[0047] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0048] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0049] Embodiment 1: This embodiment aims at the fact that the existing composite detection technology does not have the ability of long-distance detection in near space or outer space, and thus proposes a long-wave infrared and GM-APD laser composite long-distance imaging device with a common aperture reception.

[0050] The composite long-distance imaging device includes a long-wave infrared imaging detection component, a GM-APD laser imaging detection component, and a common aperture receiving optical component;

[0051] The long-wave infrared imaging detection component is used to detect and image the target at a long distance. It is also used to detect, image and track the target at a medium distance in combination with the GM-APD laser imaging detection component to obtain the relative position relationship with the target. It is also used to identify the category and local key parts of non-cooperative targets and realize the measurement of target parameters in combination with the GM-APD laser imaging detection component at a close distance through a composite multi-dimensional information fusion method;

[0052] The common aperture receiving optical component is used to align the imaging field of view of the long-wave infrared imaging detection component and the GM-APD laser imaging detection component.

[0053] The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception proposed in this embodiment aims to address the current deficiencies in the ability to accurately perceive the situation of long-distance targets in real time. It improves the situation awareness range through long-wave infrared imaging detection technology, and achieves accurate measurement and tracking of targets at medium and short distances through GM-APD laser imaging detection technology. It also achieves optimized layout of the optical-mechanical system and multi-dimensional information fusion perception and accurate identification measurement through long-wave infrared / GM-APD laser common optical path fusion optical detection technology. The composite imaging device is mainly composed of long-wave infrared imaging detection components, GM-APD laser imaging detection components, common aperture receiving optical components, etc. It can accurately detect targets at long distances (≥90km) through long-wave infrared; at medium distances (90km~2km), it can realize continuous and accurate detection and stable tracking of targets through collaborative detection of long-wave infrared and GM-APD laser, and obtain the relative position relationship with the target; at close distances (2km~200m), it can identify the category and local key parts of non-cooperative targets through technical means such as GM-APD laser and long-wave infrared composite multi-dimensional information fusion, and realize accurate measurement of target parameters, so as to improve the accuracy and robustness of target detection, identification, measurement.

[0054] Implementation Method 2: See Figures 1 to 4 This embodiment is described. This embodiment specifically describes the common aperture receiving optical component described in the first embodiment.

[0055] The composite optical receiving system needs to efficiently receive 8.6-9.7μm long-wave infrared and 1064nm lasers under the condition that the laser and infrared central fields of view are aligned, and it also needs to have the ability to efficiently separate the spectra of the two wavelength ranges received. This is a challenge faced by the entire composite optical system. To address this problem, this implementation adopts a common-aperture receiving optical system to achieve the alignment of the laser and the long-wave infrared central imaging field of view; and uses a deep reinforcement learning algorithm to complete the off-axis two-reflection free-form surface optical design. Through optimized design, the common-aperture optical receiving system can efficiently receive 8.6-9.7μm long-wave infrared and 1064nm lasers.

[0056] like Figure 1 and Figure 2 As shown, the off-axis two-mirror optical receiving system specifically includes two-mirror adjustable reflector group, long-wave infrared reflector 9, beam splitter prism 3, laser reflector 10, linear polarizer 4, variable aperture 5, narrow-band filter 6;

[0057] The long-wave infrared reflector 9 is used to send the incident light in the long-wave infrared band to the long-wave infrared imaging detection component 7. Figure 3 As shown;

[0058] like Figure 4 As shown, the laser reflector 10, the linear polarizer 4, the variable aperture 5 and the narrow-band filter 6 are sequentially arranged at the front end of the GM-APD laser imaging detection component 8, as shown in FIG. Figure 4 As shown;

[0059] The laser reflector 10 is used to project the laser light of 1064nm band onto the linear polarizer 4, and is also used to reflect the light of other bands onto the beam splitter prism 3;

[0060] The two-reverse adjustable reflector group includes a first off-axis two-reverse receiving free-form surface optical lens 1 and a second off-axis two-reverse receiving free-form surface optical lens 2, so that the two-reverse adjustable reflector group reflects the incident light onto the laser reflector 10 through two free-form surface optical lenses;

[0061] The spectroscopic prism 3 is a long-wave infrared and 1064nm spectroscopic prism, which is arranged between the long-wave infrared reflector 9 and the laser reflector 10, and is used to repeatedly perform spectroscopic processing on the incident light, sending the laser in the 1064nm band to the laser reflector 10, and sending the incident light in the long-wave infrared band to the long-wave infrared reflector 9.

[0062] In actual application of this embodiment, the first off-axis two-reflection receiving free-form optical lens 1 and the second off-axis two-reflection receiving free-form optical lens 2 are both off-axis paraboloids. Since the field of view of the system is large, the main mirror aperture and the exit pupil position restrict each other, and the magnification of the telescope system cannot be too high, so this embodiment adopts 2.5 times. The variable aperture 5 is set between the linear polarizer 4 and the narrow-band filter 6, and the light flux is controlled to adapt to the imaging under different light intensities during the day and night. The laser reflector 10 and the long-wave infrared reflector 9 are both provided with an anti-reflection film and a high-reflection dielectric film; after the lens is coated with an anti-reflection film, each mirror surface is guaranteed to have a transmittance of at least 99.5%; the reflector is coated with a high-reflection dielectric film, which ensures a certain degree of wipe resistance while ensuring a reflectivity of at least 97%; the narrow-band filter 6 ensures that the peak transmittance is not less than 90%.

[0063] Furthermore, it is necessary to set parameters for each system; the emission optical system parameters are: working band: 1064nm; emission beam divergence: <1mrad; coupling mode with laser: spatial optical coupling; emission optical system transmittance: ≥90%@1064nm.

[0064] Receiving optical system parameters: Long wave: band: 8.6~9.7μm; F number: 2; field of view: ±2.2°; focal length: 160mm; maximum distortion: 4% (cannot be further reduced by the rear group correction). Laser: aperture: 70mm; band: 1064nm; focal length: 183.4mm; field of view: 1°×1°; detector: 64×64; maximum distortion: <1%.

[0065] In summary, in order to accurately detect the target, the infrared system, laser system and other multi-system splicing methods are often used to achieve this, but this method often has the disadvantages of large system volume, large mass, inconvenient installation and adjustment, and poor maneuverability. This embodiment adopts an off-axis two-reflection form to design the front-end common aperture receiving optical system, and the laser transmission and reception adopt a separate transmission and reception design. Under the premise of meeting the long-wave infrared and GM-APD laser composite detection, the photoelectric detection system can be made lightweight and miniaturized, the layout of the optical-mechanical system can be optimized, the efficiency of infrared and laser multi-spectral color separation can be improved, and the spatial registration of infrared and laser information can be achieved.

[0066] Implementation method three: This implementation method provides a free-form surface optical parameter design method based on a deep reinforcement learning algorithm. The design method can be used to design the parameters of the common-aperture receiving optical components, thereby realizing the high-efficiency reception of the common-aperture optical receiving system for long-wave infrared in the 8.6-9.7μm band and 1064nm laser.

[0067] The detailed steps of the method are as follows:

[0068] Step 1: Establish the initial system, design constraints and system optimization environment according to the requirements, define the empty Q table and the value of ε (a number between 0 and 1, but close to 0 for the ε greedy strategy), and define the end state of the optimization process;

[0069] Step 2: Initialize the current state number i=1, the current design step number ω=1, and the current data set number k=1;

[0070] Step 3: Start the entire design process from the initial state;

[0071] Step 4: Assume that the design process reaches the i-th state S i (non-end state), the current event number is k, and the total number of possible operations that can be performed in this state is N i . Check if S exists in the Q table i , if yes, get all action values ​​Q π (S i ,a j )(j=1...N i ). If not, set S i Add to the Q table and set all action values ​​Q π (S i ,a j )(j=1...N i ) is initialized to zero;

[0072] Step 5: Find Q π (S i ,a j )(j=1...N i ) is the action with the largest action value a * ;

[0073] Step 6: If the end state is reached, the current episode is completed. Evaluate the reward value R of the current system for further use;

[0074] Step 7: Repeat the above steps until the maximum number of sets k is reached max .

[0075] Figure 5 This is the initial simulation diagram of the common aperture receiving optical system; Figure 6 This is a simulation diagram of the optimized common aperture receiving optical system; from the figure, we can see the initial structure of the free-form surface off-axis reflection and the final result obtained by the deep reinforcement learning algorithm optimization. The optimization design does not require manual participation and takes only a few hours.

[0076] Implementation method 4: The method for designing optical parameters of free-form surfaces based on deep reinforcement learning algorithm described in the above implementation method can be fully implemented using computer software. Therefore, correspondingly, this implementation method provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the method for designing optical parameters of free-form surfaces based on deep reinforcement learning algorithm described in the above implementation method is executed.

[0077] This embodiment also provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program. When the processor runs the computer program stored in the memory, the processor executes the free-form surface optical parameter design method based on the deep reinforcement learning algorithm described in the above embodiment.

[0078] A computer device provided in this embodiment, the hardware device of this part is a general model and is not represented in the form of a diagram. The system includes a processor and a memory, wherein the processor and the memory can be connected via a bus or other means. The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs and modules, and corresponding program instructions / modules. The processor executes various functional applications and data processing of the processor by running the non-volatile software programs, instructions and modules stored in the memory, so as to realize the free-form surface optical parameter design method and steps based on the deep reinforcement learning algorithm in the above-mentioned method implementation.

[0079] Embodiment 5: This embodiment is a specific description of the long-wave infrared imaging detection component and the GM-APD laser imaging detection component described in Embodiment 1;

[0080] Long-wave infrared detectors mainly include two types: cooled long-wave infrared detectors (working band 7.7-9.3um) and uncooled long-wave infrared detectors (8-12um). This embodiment selects a 320×256 pixel cooled long-wave infrared detector. The detector core assembly consists of five functional units: an integral Stirling cooled long-wave staring (320×256) infrared detector (MARSLWRM3) assembly, a detector interface circuit (two circuit boards), a refrigerator interface circuit, an image preprocessing circuit (including a control interface), and a power conversion circuit. Physically, it is divided into a detector assembly and five circuit boards.

[0081] The infrared detector is composed of a long-wave staring infrared detector (FPA) with an integral Stirling cycle cooler. The cooler cools the photosensitive surface of the detector to the working point temperature (about 80K), and the infrared detector (FPA) completes the photoelectric signal conversion of the target radiation;

[0082] The function of the detector interface circuit is to provide the detector with the power supply and various bias voltages required for operation, buffer and amplify the electrical signals output by the detector, and provide two-way detector dewar temperature signals, one for the refrigerator and one for the imaging preprocessing circuit;

[0083] The refrigerator interface circuit supplies filtered DC +24V to the detector refrigerator and provides a feedback loop for the operation of the refrigerator;

[0084] The imaging preprocessing circuit converts the analog signal read out by the detector interface circuit into a digital signal via A / D, realizes functions such as non-uniformity correction, bad pixel replacement, gain and bias control of the image signal, and outputs analog and digital video signals.

[0085] In order to meet the detection requirements of a detection distance of no less than 90 km and a distance resolution of no more than 0.3 m, the parameter design table of the GM-APD laser imaging detection component proposed in this embodiment is shown in Table 1 below:

[0086] Table 1

[0087] System Parameters index System Parameters index Narrowband filter bandwidth 1nm Single pulse energy ≥16mJ Detector dark count ≤10kHz Transmitting and receiving field of view 1°×1° wavelength 1064nm Detector resolution 64×64 Laser repetition rate 2.5kHz Detector quantum efficiency ≥0.7 Transmitting and receiving optical transmittance 0.9 vs 0.9 Laser pulse width 2ns caliber Max. 70mm Detector timing accuracy 1ns

[0088] Implementation Method 6: See Figures 7 to 9 This embodiment is described. This embodiment is to describe the effect of a long-wave infrared and GM-APD laser composite long-distance imaging device with a common aperture reception described in the above embodiment.

[0089] By adjusting the system laser power, the composite long-distance imaging device proposed in the present invention can achieve high-resolution imaging of a 27km mountain. Figure 7 shown.

[0090] By increasing the laser energy, when the single pulse energy is about 4mJ, the present invention can achieve high-resolution imaging of a 48km mountain. The imaging results are as follows: Figure 8 shown.

[0091] Indoor test scene and results of maximum laser detection distance Fig. 9As shown, the target distance is about 55m, and the atmospheric visibility is 7km. Under the distance and visibility conditions, the equivalent range extinction ratio S of the laser detection distance of 60km is calculated to be 87.1. When S3 is 0, the equivalent range extinction ratio S4 of the attenuator is 52.5, and the attenuator attenuation value OD is 52.5 / 10=5.3. When the attenuator attenuation value OD is 5.5, the signal-to-background ratio SBR of the echo signal is 1.09, and the extinction ratio parameter S0 is 89.6 at this time, and the calculated laser equivalent detection distance is 75km. When the attenuator attenuation value OD is 5.8, the signal-to-background ratio SBR of the echo signal is 0.75, and the extinction ratio parameter S0 is 92.6 at this time, and the calculated laser equivalent detection distance is 87km. When the attenuator attenuation value OD is 6.0, the signal-to-background ratio SBR of the echo signal is 0.50, and the extinction ratio parameter S0 at this time is 94.6, and the calculated laser equivalent detection distance is 97km. For GM-APD laser radar, when the signal-to-background ratio SBR is lower than 0.5, it can be considered as a weak signal detection scenario. Therefore, the maximum detection distance of the laser of the present invention is 97km.

[0092] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0093] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0094] The above description is only the implementation mode of the present invention and is not limited to the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception, characterized in that: Including long-wave infrared imaging detection components, GM-APD laser imaging detection components, and common aperture receiving optical components; The long-wave infrared imaging detection component is used to detect and image the target at a long distance. It is also used to detect, image and track the target at a medium distance in combination with the GM-APD laser imaging detection component to obtain the relative position relationship with the target. It is also used to identify the category and local key parts of non-cooperative targets and realize the measurement of target parameters in combination with the GM-APD laser imaging detection component at a close distance through a composite multi-dimensional information fusion method; The common aperture receiving optical component is used to align the imaging field of view of the long-wave infrared imaging detection component and the GM-APD laser imaging detection component.

2. The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception according to claim 1 is characterized in that: ≥90km is long distance, 90km~2km is medium distance, and 2km~200m is short distance.

3. The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception according to claim 1 is characterized in that: The common aperture receiving optical component is realized by using an off-axis two-mirror optical receiving system.

4. The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception according to claim 1 is characterized in that: The off-axis two-mirror optical receiving system includes two-mirror adjustable reflector group, long-wave infrared reflector, beam splitter, laser reflector, linear polarizer, variable aperture, narrow-band filter; The laser reflector, linear polarizer, variable aperture and narrow-band filter are sequentially arranged at the front end of the GM-APD laser imaging detection component; The long-wave infrared reflector is used to send incident light in the long-wave infrared band to the long-wave infrared imaging detection component; The two anti-adjustable reflector groups are used to reflect the incident light onto the laser reflector through two free-form surface optical mirrors; The laser reflector is used to project the laser of 1064nm band onto the linear polarizer, and is also used to reflect the light of other bands onto the beam splitter prism; The beam splitter prism is arranged between the long-wave infrared reflector and the laser reflector for repeatedly performing beam splitting processing on the incident light, sending the laser in the 1064nm band to the laser reflector and sending the incident light in the long-wave infrared band to the long-wave infrared reflector.

5. The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception according to claim 4 is characterized in that: The laser reflector and the long-wave infrared reflector are both provided with a reduced reflection film and a high reflection medium film; The anti-reflection film is used to ensure at least 99.5% transmittance, and the high-reflection dielectric film is used to ensure at least 97% reflectivity.

6. The long-wave infrared and GM-APD laser composite long-distance imaging device with common aperture reception according to claim 4 is characterized in that: Both free-form optical mirrors are off-axis paraboloids.

7. A free-form surface optical parameter design method based on a deep reinforcement learning algorithm, characterized in that: The design method is used to design the parameters of the common aperture receiving optical component according to any one of claims 1 to 6, and the method is: Step 1: Establish the initial system, design constraints and system optimization environment, and define the empty Q table, ε value and the end state of the optimization process; Step 2: Initialize the current state number i=1, the current design step number ω=1, and the current data set number k=1; Step 3: The design process reaches the i-th state S i , the current event number is k, and the total number of operations that can be performed in this state is N i ; Step 4: Check if S exists in the Q table i , if it exists, get all action values ​​Q π (S i ,a j )(j=1...N i ), if it does not exist, replace S i Add to the Q table and set all action values ​​Q π (S i ,a j )(j=1...N i ) is initialized to zero; Step 5: Find Q π (S i ,a j )(j=1...N i ) is the action with the largest action value a * ; Step 6: If the end state is reached, the current episode is completed, and the reward value R of the current system is evaluated; Step 7: Repeat the above steps until the maximum number of sets k is reached max , as the optimal structural parameters.

8. The method for designing optical parameters of free-form surfaces based on deep reinforcement learning algorithm according to claim 7, characterized in that: The ε value is a number between 0 and 1.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the method for designing optical parameters of free-form surfaces based on a deep reinforcement learning algorithm as described in claim 7.

10. A computer device, characterized in that: The device includes a memory and a processor, wherein a computer program is stored in the memory. When the processor runs the computer program stored in the memory, the processor executes the free-form surface optical parameter design method based on deep reinforcement learning algorithm as described in claim 7.

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