System and method for measuring laser scattering characteristic of false target

Abstract

The invention discloses a system and a method for measuring laser scattering characteristics of a false target, and relates to the technical field of target detection, identification and stealth. Firstly, a standard diffuse reflection plate is calibrated, a laser irradiator is used for irradiating the standard diffuse reflection plate, and a calibrated laser energy detection unit is used for receiving a laser signal; the amplitude and the normalized distribution rule of the scattered laser energy of the standard diffuse reflection plate are obtained through measurement of the measurement control system; a laser irradiator is used for irradiating the natural ground feature false target, the layout mode of the calibrated laser energy detection unit is not changed, and the amplitude of scattering laser energy and the scattering laser energy distribution rule of the natural ground feature false target are measured in the same mode as a standard diffuse reflection plate; and comparing the amplitude of the scattering laser energy of the standard diffuse reflection plate and the amplitude of the scattering laser energy of the natural surface feature false target to obtain the laser scattering coefficients of the natural surface feature false target in different directions, so that the laser scattering energy distribution characteristics and scattering coefficients of different types of false targets in different directions can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical fields of target detection, identification and stealth, and in particular to a system and method for measuring the laser scattering characteristics of a false target. Background Art

[0002] The laser scattering characteristics of false targets have a great impact on the work of the laser-guided weapon guidance seeker. It is a key factor in the laser energy transmission chain and an important basis for determining key indicators such as the output power of the laser irradiation device and the sensitivity of the seeker. Active decoy jamming equipment for laser-guided weapons often uses natural objects or simulated body camouflage equipment on the battlefield as false targets. The laser scattering characteristics of false targets will have a direct impact on the decoy effect of laser-guided weapons. Therefore, measuring the laser scattering characteristics of false targets is particularly important for studying the active decoy effect of laser-guided weapons.

[0003] The ideal diffuse reflection false target is a standard diffuse reflection plate that follows the Lambert cosine law. However, from the perspective of actual combat, it is impractical to deploy a large number of standard diffuse reflection plates on the battlefield. It is often necessary to adopt a method closer to actual combat, which is to randomly select ground objects to replace standard diffuse reflection plates. Even if a Lambert cosine body false target is deployed, its direction is also directional. If it is predicted that the enemy's laser-guided weapon is attacking from the back, the direction angle of the diffuse reflection plate must be adjusted or even replaced with another diffuse reflection plate false target. Randomly selecting natural objects such as rock surfaces, green grass, roads, land, and large trees with lush branches and leaves on the battlefield can overcome the above difficulties. Therefore, how to use various natural objects as false targets to measure laser scattering characteristics has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a system and method for measuring the laser scattering characteristics of false targets, which can measure the laser scattering energy distribution characteristic curves and scattering coefficients of different types of natural objects and false targets at different directions.

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

[0006] A system for measuring the laser scattering characteristics of a false target, comprising:

[0007] A laser illuminator, used for emitting laser signals to a target to be measured; the target to be measured is a standard diffuse reflection plate or a natural ground object false target;

[0008] A plurality of laser energy detection units, wherein the laser energy detection units are placed in a counterclockwise order with a fixed interval angle and equal radius, with the measured target as the center and facing the measuring surface of the measured target, and each laser energy detection unit is at the same height and the formed field of view completely covers the measured target, receives the laser signal reflected by the measured target, and outputs the amplitude of the scattered laser energy of the measured target;

[0009] A measurement control system connected to the laser energy detection unit via wireless communication, and used to obtain laser scattering coefficients of natural ground object false targets at different orientations by comparing the amplitudes of scattered laser energy of the standard diffuse reflection plate and the natural ground object false targets;

[0010] The light outlet of the laser irradiator and the field of view center of the laser energy detection unit are both aimed at the center position of the measured object.

[0011] Furthermore, the laser energy detection units are products of the same model and batch, and are uniformly numbered;

[0012] The laser energy detection unit includes an optical system, a narrow-band filter, a photodetector, a signal amplification and processing circuit, a wireless data transmission module, a power module, and a sighting system;

[0013] Among them, the optical system is used for energy collection to improve detection sensitivity; the narrow-band filter is used to filter out radiation other than the measurement wavelength to reduce background noise; the signal amplification and processing circuit is used to amplify, A / D convert and process the output signal of the photodetector; the wireless data transmission module sends the measurement data to the measurement control system and receives the measurement and control signal from the measurement control system.

[0014] Furthermore, when the natural object false target is a typical surface false target, laser energy detection units are sequentially placed in a counterclockwise order within a range of 0° to 180° on one side of the surface false target at fixed angle intervals and equal radii.

[0015] Furthermore, the measurement and control system includes a data acquisition card wirelessly connected to the laser energy detection unit, and is used to collect the amplitude of the scattered laser energy received by the laser energy detection unit.

[0016] The present invention also provides a method for measuring the laser scattering characteristics of a false target, which is applied to the laser scattering characteristics measurement system of the false target, and comprises the following steps:

[0017] S1. Calibrate the standard diffuse reflection plate, illuminate the standard diffuse reflection plate with a laser irradiator, receive the laser signal through the calibrated laser energy detection unit, and measure the amplitude of the scattered laser energy and the energy normalized distribution curve of the standard diffuse reflection plate through the measurement control system;

[0018] S2, using a laser irradiator to illuminate the natural object false target, without changing the layout and position of the calibrated laser energy detection unit, and receiving the laser signal through the calibrated laser energy detection unit, and measuring the amplitude and distribution law of the scattered laser energy of the natural object false target through the measurement control system;

[0019] S3. By comparing the amplitudes of scattered laser energy corresponding to the standard diffuse reflection plate and the natural ground object false target, the laser scattering coefficients of the natural ground object false target at different orientations are obtained.

[0020] Furthermore, when the selected natural object false target is a typical surface false target, laser energy detection units are sequentially placed in a counterclockwise order within a range of 0° to 180° on one side of the surface false target at equal radii at fixed angle intervals; each laser energy detection unit is adjusted to have the same height and a field of view that completely covers the measured target, and the light outlet of the laser illuminator and the center of the field of view of the laser energy detection unit are aimed at the center position of the measured target;

[0021] When the selected natural object false target is a volume false target, the laser energy detection units are placed in sequence in a counterclockwise order with fixed interval angles and equal radius, with the volume false target as the center, and the other settings are consistent with the surface false target.

[0022] Furthermore, before measuring the laser scattering characteristics, the method further includes the following steps:

[0023] S0. Consistency calibration of laser energy detection unit: select a calibrated ultra-high sensitivity laser energy density detection device as the standard, unify the numbering of the laser energy detection units required for the test, and perform consistency calibration. Place the numbered laser energy detection unit in the same position as the ultra-high sensitivity laser energy density detection device, and calculate the consistency of the laser energy detection unit according to kρ=k1ρ1=k2ρ2=……=k n ρ n , ρ is the laser energy density, n is a positive integer greater than or equal to 2, k = 1, and we get k1, k2, ..., k n That is the consistency correction coefficient of each laser energy detection unit.

[0024] Furthermore, the calibration of the standard diffuse reflection plate specifically includes the following steps:

[0025] S1.1. Set the radial direction of the standard diffuse reflector to 0° and the normal direction to 90°. The angles increase in the counterclockwise direction to 180°. The laser incident angle is defined as the angle between the incident laser beam and the radial direction of the false target.

[0026] S1.2. Place the standard diffuse reflector vertically in front of the selected natural object decoy, and place 11 laser energy detection units at equal intervals of 10° counterclockwise from 40° to 140° on a semicircle 50m away from the center of the standard diffuse reflector;

[0027] S1.3. Adjust the supporting tripod of the laser energy detection unit so that the heights of all laser energy detection units are consistent; and adjust the receiving field of view of the laser energy detection unit so that it is aimed at the center of the standard diffuse reflection plate and completely covers the diffuse reflection plate, and the laser illuminator is set up 100m away from the diffuse reflection plate.

[0028] Furthermore, the S0 also includes: using matte cloth to cover the bracket to reduce background interference.

[0029] Furthermore, the step S1 further comprises: performing three fittings on the amplitude of the scattered laser energy of the measured standard diffuse reflection plate to obtain a fitted energy normalized distribution law curve.

[0030] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: a system and method for measuring the laser scattering characteristics of a false target provided by the present invention can measure the laser scattering energy distribution characteristics and scattering coefficients of different types of natural ground false targets in different orientations, and provide technical support for false target selection and jamming equipment deployment during laser decoy jamming tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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 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 these drawings without paying creative labor.

[0032] Figure 1 This is a schematic diagram of the layout for measuring the laser scattering characteristics of a false target on the surface in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the layout for measuring the laser scattering characteristics of a false target in an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the measurement layout of the laser scattering characteristics of the standard diffuse reflector in the embodiment of the present invention;

[0035] Figure 4Flow chart of a method for measuring laser scattering characteristics of a false target in an embodiment of the present invention;

[0036] Figure 5 is a graph showing the normalized distribution law of energy of scattered laser light when the laser light is incident on a standard diffuse reflection plate in an embodiment of the present invention;

[0037] Figure 6 It is a graph of scattered laser energy density when the laser is incident on a standard diffuse reflection plate and a soil wall at 60 degrees in an embodiment of the present invention;

[0038] Figure 7 This is a graph showing the energy density of scattered laser light when the laser light is incident on a standard diffuse reflection plate and a soil wall at 90 degrees in an embodiment of the present invention;

[0039] Figure 8 is a scattering coefficient curve diagram of the laser incident on the soil surface at different angles in the embodiment of the present invention;

[0040] Fig. 9 This is a graph showing the energy distribution of scattered laser light when the laser incident on the camouflage deck surface at an angle of 60 degrees in an embodiment of the present invention;

[0041] Fig.10 This is a graph showing the energy distribution of scattered laser light when the laser is incident on the camouflage deck surface at an angle of 90 degrees in an embodiment of the present invention;

[0042] Fig.11 This is a graph showing the energy distribution of scattered laser light when the laser is incident on the camouflage deck surface at different angles in an embodiment of the present invention;

[0043] Fig.12 Schematic diagram of the distribution law of laser scattering coefficient of grassland in an embodiment of the present invention;

[0044] Fig.13 Schematic diagram of the distribution law of laser scattering coefficient of loess in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] 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.

[0046] The purpose of the present invention is to provide a system and method for measuring the laser scattering characteristics of false targets, which can measure the laser scattering energy distribution characteristic curves and scattering coefficients of different types of natural objects and false targets at different directions.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figure 1-3 As shown, a system for measuring laser scattering characteristics of a false target provided by an embodiment of the present invention includes:

[0050] A laser illuminator, used for emitting laser signals to a target to be measured; the target to be measured is a standard diffuse reflection plate or a natural ground object false target;

[0051] A plurality of laser energy detection units, wherein the laser energy detection units are placed in a counterclockwise order with a fixed interval angle and equal radius, with the measured target as the center and facing the measuring surface of the measured target, and each laser energy detection unit is at the same height and the formed field of view completely covers the measured target, receives the laser signal reflected by the measured target, and outputs the amplitude of the scattered laser energy of the measured target;

[0052] A measurement control system connected to the laser energy detection unit via wireless communication, and used to obtain laser scattering coefficients of natural ground object false targets at different orientations by comparing the amplitudes of scattered laser energy of the standard diffuse reflection plate and the natural ground object false targets;

[0053] The light outlet of the laser irradiator and the field of view center of the laser energy detection unit are both aimed at the center position of the measured object.

[0054] In this embodiment, the measurement and control system mainly includes an industrial computer, a wireless data transmission module, and a time communication terminal; the industrial computer is used to install the measurement and control software to realize the data collection and recording of the laser signal energy detected by the numbered laser energy detection unit; the wireless data transmission module is used to realize the wireless data transmission interaction between each laser detection unit and the industrial computer; the time communication terminal is used to provide absolute time and synchronization signal for system operation.

[0055] In this embodiment, the laser energy detection units are products of the same model and batch, and are uniformly numbered;

[0056] The laser energy detection unit includes an optical system, a narrow-band filter, a photodetector, a signal amplification and processing circuit, a wireless data transmission module, a power module, and a sighting system;

[0057] Among them, the optical system is used for energy collection to improve detection sensitivity; the narrow-band filter is used to filter out radiation other than the measurement wavelength to reduce background noise; the signal amplification and processing circuit is used to amplify, A / D convert and process the output signal of the photodetector; the wireless data transmission module sends the measurement data to the measurement control system and receives the measurement and control signal from the measurement control system; the photodetector is used to detect the laser signal energy of the laser energy detection unit.

[0058] In this embodiment, when the natural object false target is a typical surface false target, such as Figure 1 As shown in FIG. 1 , laser energy detection units are placed in a counterclockwise order within a range of 0° to 180° on one side of the surface false target and at fixed angle intervals and equal radii. Figure 2 As shown, for the body false target, the laser energy detection units are placed in sequence in a counterclockwise order with fixed interval angles and equal radius, with the false target as the center. The other settings are consistent with the surface false target.

[0059] In this embodiment, the measurement and control system includes a data acquisition card wirelessly connected to the laser energy detection unit, and is used to collect the amplitude of the scattered laser energy received by the laser energy detection unit.

[0060] Example 2

[0061] like Figure 4 As shown, the embodiment of the present invention provides a method for measuring the laser scattering characteristics of a false target, which is applied to the laser scattering characteristics measurement system of the false target described in Example 1, and includes the following steps:

[0062] S1. Before the measurement begins, the standard diffuse reflection plate is calibrated; then, the standard diffuse reflection plate is irradiated with a laser irradiator, the laser signal is received by the calibrated laser energy detection unit, and the amplitude of the scattered laser energy and the energy normalized distribution curve of the standard diffuse reflection plate are measured by the measurement control system;

[0063] S2, using a laser irradiator to illuminate the natural object false target, without changing the layout and position of the calibrated laser energy detection unit, and receiving the laser signal through the calibrated laser energy detection unit, and measuring the amplitude and distribution law of the scattered laser energy of the natural object false target through the measurement control system;

[0064] S3. By comparing the amplitudes of the scattered laser energies corresponding to the standard diffuse reflection plate and the natural object false target, the laser scattering coefficients of the natural object false target at different orientations are obtained. Specifically, the scattered laser energies of the natural object false target at different orientations are divided by the scattered laser energy of the standard diffuse reflection plate at that position to obtain the laser scattering coefficients of the natural object false target.

[0065] In this embodiment, when the selected natural object false target is a typical surface false target, laser energy detection units are placed in a counterclockwise order within a range of 0° to 180° on one side of the surface false target, at fixed angle intervals and equal radii; each detector is adjusted to have the same height and a field of view that completely covers the measured target, and the light outlet of the laser illuminator and the center of the field of view of the detector are aimed at the center position of the measured target;

[0066] When the selected natural object false target is a volume false target, the laser energy detection units are placed in sequence in a counterclockwise order with fixed interval angles and equal radius, with the false target as the center, and the other settings are consistent with the surface false target.

[0067] Given that there are still some differences in the performance and response capabilities of the laser energy detection units of the same batch, it is necessary to perform consistency calibration on all the laser energy detection units used in the test. Therefore, in this embodiment, before measuring the laser scattering characteristics, the method further includes the following steps:

[0068] S0. Consistency calibration of laser energy detection unit: select a calibrated ultra-high sensitivity laser energy density detection device as the standard, unify the numbering of the laser energy detection units required for the test, and perform consistency calibration. Place the numbered laser energy detection unit in the same position as the ultra-high sensitivity laser energy density detection device. To reduce the error, perform multiple groups of measurements and calculate the average. According to kρ=k1ρ1=k2ρ2=……=k n ρ n , ρ is the laser energy density, n is a positive integer greater than or equal to 2, k = 1, and we get k1, k2, ..., k n It is the consistency correction coefficient of each laser energy detection unit. Specifically, the ultra-high sensitivity laser energy density detection equipment is a calibrated laser energy detector, which is used to determine the true value of the laser signal energy detected at the location, so as to determine the consistency coefficient of each laser energy detection unit. In addition, in order to reduce the interference of the background, corresponding measures need to be taken during the measurement, and the matte cloth is used to cover the bracket and the background targets that may cause interference. The diffuse reflectivity of the matte cloth is 0.585% after experimental determination, and its scattering can be ignored.

[0069] In this embodiment, the calibration of the standard diffuse reflection plate specifically includes the following steps:

[0070] S1.1. Set the radial direction of the standard diffuse reflector to 0° and the normal direction to 90°. The angles increase in the counterclockwise direction to 180°. The laser incident angle is defined as the angle between the incident laser beam and the radial direction of the false target.

[0071] S1.2. Place the standard diffuse reflector vertically in front of the selected natural object decoy, and place 11 laser energy detection units at equal intervals of 10° counterclockwise from 40° to 140° on a semicircle 50m away from the center of the diffuse reflector;

[0072] S1.3. Adjust the supporting tripod of the laser energy detection unit so that the heights of all laser energy detection units are consistent; and adjust the receiving field of view of the laser energy detection unit so that it aims at the center of the diffuse reflection plate and completely covers the standard diffuse reflection plate, and the laser illuminator is set up 100m away from the diffuse reflection plate. Figure 5 The normalized energy distribution law of scattered laser light when the laser is incident on a standard diffuse reflector is given, and the measured values ​​are fitted three times. Figure 5 It can be seen intuitively that the fitting curve of the measured data is approximately distributed in a cosine law, which is consistent with the cosine distribution of the incident electromagnetic wave scattering by the Lambertian body; the measured values ​​are not completely symmetrically distributed on both sides of 90°. The main reason is that the standard diffuse reflector is not completely perpendicular to the ground during placement, and the incident direction of the laser is not strictly in accordance with the normal incidence of the diffuse reflector.

[0073] In this embodiment, the step S1 further includes: performing three fittings on the amplitude of the scattered laser energy of the measured standard diffuse reflection plate to obtain a fitted energy normalized distribution law curve.

[0074] Example 3

[0075] Based on Example 1 and Example 2, this embodiment provides measurement and analysis of laser scattering characteristics of typical false surface targets (soil sections, camouflage cabin surfaces).

[0076] In this embodiment, the laser scattering characteristics of the soil section are measured and analyzed:

[0077] Soil sections are common landforms, and the measurement of their scattering characteristics has certain practical significance. In this test, a part of a soil cliff section was selected as a typical false target for measurement. The meteorological conditions of the test measurement are shown in Table 1. The layout of this test is consistent with the calibration layout of the standard diffuse reflector. 14 laser energy detection units are placed in sequence on a semicircle 50m away from the center of the diffuse reflector. First, adjust the supporting tripod of the laser energy detection unit so that all detectors are basically at the same height; adjust the receiving field of view of the laser energy detection unit so that it completely covers the selected soil section. Adjust the position of the laser illuminator so that the radial angles with the selected soil cliff section are 60° and 90° respectively for test measurement. The beam divergence angle of the laser is 0.5mrad and the repetition rate is 5Hz.

[0078] Table 1 Soil surface laser scattering characteristics measurement conditions record table

[0079]

[0080] Since the soil surface is relatively rough, a relatively flat piece was selected as the research object during the experiment. Figure 6 and Figure 7 The comparison diagram of scattered laser energy density when the laser is incident on the soil surface and the diffuse reflection plate at 60° and 90° angles respectively is given; Figure 8 The scattering coefficients when the laser is incident on the soil surface at different angles are given. Since the standard diffuse reflector is an approximate Lambertian body, the scattering characteristics of the laser are independent of the incident angle of the laser and present an approximate cosine distribution. From the analysis of the measurement results, it can be seen that the energy of the diffuse reflector reaches the maximum near the normal position, and the energy gradually decreases on both sides of the normal and presents a symmetrical distribution; for the soil section, the position where the peak value of the scattered laser energy appears is related to the incident angle of the laser. When the laser is incident at 60°, the maximum value of the scattered laser energy appears exactly at 60°, and the scattered laser energy on both sides of 60° presents an asymmetrical distribution, and the change trend is slower in the direction of increasing angle.

[0081] In this embodiment, the measurement and analysis of the laser scattering characteristics of the camouflage deck surface are as follows:

[0082] Table 2 Camouflage deck surface laser scattering characteristics measurement conditions record

[0083]

[0084] Comprehensive analysis Figure 9-11 It can be seen that the camouflage deck surface has an obvious mirror effect. When the laser is incident on the camouflage deck surface at an angle of 60°, the peak of the scattered laser energy appears at the 120° position.

[0085] In summary, according to the measurement results, it can be seen that the laser scattering coefficient of the soil section is between 0.30 and 0.40, and the laser scattering coefficient of the camouflage cabin surface is between 0.36 and 0.52.

[0086] Example 4

[0087] Based on Example 1 and Example 2, this example provides measurement and analysis of laser scattering characteristics of typical false targets (green grass, yellow soil).

[0088] In this embodiment, the laser scattering characteristics of the green grassland target are measured and analyzed:

[0089] Grassland has the characteristics of wide distribution and large area in the environment, which provides convenience for its selection as a false target for laser active decoy. The meteorological conditions for the test measurement are shown in Table 1. First, the diffuse reflection plate is placed flat on the grass, and the laser is aimed at the center of the diffuse reflection plate at a distance of 50m. The laser energy detection units are placed counterclockwise with the center of the diffuse reflection plate as the center of the circle, and the laser energy detection units are placed at equal radius and a certain angle. All detectors are adjusted to make them consistent in height, and the field of view covers the diffuse reflection plate. The laser emits the laser three times, and the scattered laser energy received by each detector is recorded. Then the average value is calculated as the energy value of the scattered laser at this position under the conditions of this test; remove the diffuse reflection plate, repeat the same test plan and layout, and measure the scattered laser energy of the body false target; divide the scattered laser energy of different positions of the body false target by the scattered laser energy of the standard diffuse reflection plate at this position to obtain the laser scattering coefficient of the natural false target.

[0090] Table 3 Measurement conditions of laser scattering characteristics of green grassland

[0091]

[0092] Fig.12 The distribution law of the scattering coefficient of grass irradiated by laser is given. The scattering coefficients at 15°, 165°, 195° and 345° on both sides of the laser incident direction are 0.4859, 0.4115, 0.3655 and 0.4617 respectively, and the average scattering coefficients of the four positions are 0.4226. Therefore, under the measurement conditions of this experiment, the scattering coefficient of the grass in the laser incident direction is 0.4226.

[0093] In this embodiment, the laser scattering characteristics of the loess target are measured and analyzed as follows:

[0094] Table 4 Loess laser scattering characteristics measurement conditions record

[0095]

[0096] According to the test plan for measuring the laser scattering characteristics of false targets, the test steps for measuring the laser scattering characteristics of green grassland were repeated, and the laser scattering characteristics of loess were measured according to the test conditions as described in Table 4. The test results are shown in Fig.13 shown. Fig.13 The distribution law of laser scattering coefficient of loess is described. The scattering coefficients at 15°, 165°, 195° and 345° on both sides of the laser incident direction are 0.3895, 0.3775, 0.3886 and 0.3482 respectively. The average value of the scattering coefficients at the four positions is 0.3760.

[0097] A comprehensive analysis of the laser scattering characteristics of the two natural false targets, green grassland and loess, shows that due to the azimuthal differences in the projection area of ​​the laser spot irradiated on the false target, the scattered laser energy in the laser incident direction is significantly greater than that at other positions.

[0098] In summary, the laser scattering characteristic measurement system and method of false targets provided by the present invention use a laser illuminator to illuminate a standard diffuse reflection plate and a natural object false target respectively, use laser energy detection units with a unified number to receive laser signals at the same position, use an oscilloscope to observe and record the amplitude of the detector output signal energy, and compare the two to obtain the laser scattering coefficient of the natural object false target in different orientations, thereby realizing the laser scattering energy distribution characteristics and scattering coefficients of different types of natural object false targets in different orientations, and providing technical support for false target selection and jamming equipment deployment in laser decoy jamming tests.

[0099] The remaining technical features in this embodiment can be flexibly selected by those skilled in the art according to actual conditions to meet different specific practical needs. However, it is obvious to those skilled in the art that it is not necessary to adopt these specific details to implement the present invention. In other examples, in order to avoid confusing the present invention, the well-known components, structures or parts are not specifically described, which are all within the technical protection scope defined by the technical solution claimed for protection in the claims of the present invention.

[0100] Modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the scope of protection of the claims attached to the present invention. In the above description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details are not necessary to practice the present invention. In other examples, in order to avoid confusing the present invention, well-known technologies, such as specific construction details, operating conditions and other technical conditions, are not specifically described.

[0101] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system for measuring the laser scattering characteristics of a false target, characterized in that: include: A laser illuminator, used for emitting laser signals to a target to be measured; the target to be measured is a standard diffuse reflection plate or a natural ground object false target; A plurality of laser energy detection units, wherein the laser energy detection units are placed in a counterclockwise order with a fixed interval angle and equal radius, with the measured target as the center and facing the measuring surface of the measured target, and each laser energy detection unit is at the same height and the formed field of view completely covers the measured target, receives the laser signal reflected by the measured target, and outputs the amplitude of the scattered laser energy of the measured target; A measurement control system connected to the laser energy detection unit via wireless communication, and used to obtain laser scattering coefficients of natural ground object false targets at different orientations by comparing the amplitudes of scattered laser energy of the standard diffuse reflection plate and the natural ground object false targets; The light outlet of the laser irradiator and the field of view center of the laser energy detection unit are both aimed at the center position of the measured object.

2. The laser scattering characteristic measurement system of a false target according to claim 1, characterized in that: The laser energy detection units are of the same model and batch and are uniformly numbered; The laser energy detection unit includes an optical system, a narrow-band filter, a photodetector, a signal amplification and processing circuit, a wireless data transmission module, a power module, and a sighting system; Among them, the optical system is used for energy collection to improve detection sensitivity; the narrow-band filter is used to filter out radiation other than the measurement wavelength to reduce background noise; the signal amplification and processing circuit is used to amplify, A / D convert and process the output signal of the photodetector; the wireless data transmission module sends the measurement data to the measurement control system and receives the measurement and control signal from the measurement control system.

3. The laser scattering characteristic measurement system of a false target according to claim 1, characterized in that: When the natural ground object false target is a typical surface false target, the laser energy detection units are sequentially placed in a counterclockwise order within a range of 0° to 180° on one side of the surface false target at fixed angle intervals and equal radii.

4. The laser scattering characteristic measurement system of a false target according to claim 1, characterized in that: The measurement and control system comprises a data acquisition card wirelessly connected to the laser energy detection unit, and is used for acquiring the amplitude of the scattered laser energy received by the laser energy detection unit.

5. A method for measuring the laser scattering characteristics of a false target, applied to the laser scattering characteristics measurement system of a false target according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Calibrate the standard diffuse reflection plate, illuminate the standard diffuse reflection plate with a laser irradiator, receive the laser signal through the calibrated laser energy detection unit, and measure the amplitude of the scattered laser energy and the energy normalized distribution curve of the standard diffuse reflection plate through the measurement control system; S2, using a laser irradiator to illuminate the natural object false target, without changing the layout and position of the calibrated laser energy detection unit, and receiving the laser signal through the calibrated laser energy detection unit, and measuring the amplitude and distribution law of the scattered laser energy of the natural object false target through the measurement control system; S3. By comparing the amplitudes of scattered laser energy corresponding to the standard diffuse reflection plate and the natural ground object false target, the laser scattering coefficients of the natural ground object false target at different orientations are obtained.

6. The method for measuring the laser scattering characteristics of a false target according to claim 5, characterized in that: When the selected natural ground object false target is a typical surface false target, laser energy detection units are placed in a counterclockwise order and at fixed angle intervals on one side of the surface false target within a range of 0° to 180°; each laser energy detection unit is adjusted to have the same height and a field of view that completely covers the measured target, and the light outlet of the laser illuminator and the center of the field of view of the laser energy detection unit are aimed at the center position of the measured target; When the selected natural object false target is a volume false target, the laser energy detection units are placed in sequence in a counterclockwise order with fixed interval angles and equal radius, with the volume false target as the center, and the other settings are consistent with the surface false target.

7. The method for measuring the laser scattering characteristics of a false target according to claim 5, characterized in that: Before measuring the laser scattering characteristics, the method further comprises the following steps: S0. Consistency calibration of laser energy detection unit: select a calibrated ultra-high sensitivity laser energy density detection device as the standard, unify the numbering of the laser energy detection units required for the test, and perform consistency calibration. Place the numbered laser energy detection unit in the same position as the ultra-high sensitivity laser energy density detection device, and calculate the consistency of the laser energy detection unit according to kρ=k1ρ1=k2ρ2=……=k n ρ n , ρ is the laser energy density, n is a positive integer greater than or equal to 2, take k = 1, and get k1, k2...k n That is the consistency correction coefficient of each laser energy detection unit.

8. The method for measuring the laser scattering characteristics of a false target according to claim 5, characterized in that: The calibration of the standard diffuse reflection plate specifically includes the following steps: S1.

1. Set the radial direction of the standard diffuse reflector to 0° and the normal direction to 90°. The angles increase in the counterclockwise direction to 180°. The laser incident angle is defined as the angle between the incident laser beam and the radial direction of the false target. S1.

2. Place the standard diffuse reflector vertically in front of the selected natural object decoy, and place 11 laser energy detection units at equal intervals of 10° counterclockwise from 40° to 140° on a semicircle 50m away from the center of the standard diffuse reflector; S1.

3. Adjust the supporting tripod of the laser energy detection unit so that the heights of all laser energy detection units are consistent; and adjust the receiving field of view of the laser energy detection unit so that it is aimed at the center of the standard diffuse reflection plate and completely covers the diffuse reflection plate, and the laser illuminator is set up 100m away from the diffuse reflection plate.

9. The method for measuring the laser scattering characteristics of a false target according to claim 5, characterized in that: The S0 also includes: using matte cloth to cover the bracket to reduce background interference.

10. The method for measuring the laser scattering characteristics of a false target according to claim 5, characterized in that: The step S1 further includes: performing three fittings on the amplitude of the scattered laser energy of the measured standard diffuse reflection plate to obtain a fitted energy normalized distribution law curve.

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