A simulation device for measuring pBRDF of sea surface targets and its use method

Abstract

The present invention provides a simulation device for measuring pBRDF of sea surface targets and a method for using the same, belonging to the field of polarized light scattering characteristic measurement and analysis and photoelectric imaging technology, comprising a ground rotating measurement frame, a sea surface scene simulation device, a polarized light transmitting system, a receiving system and an information processing system, wherein the polarized light transmitting system and the receiving system are placed on the ground rotating measurement frame; the receiving system is electrically connected to the information processing system. The present invention can simulate the fog generated on the ocean surface using water vapor and NaCl particles indoors, can establish a pBRDF database of sea surface targets with different water fog humidity under different salt particle concentrations according to the measurement results of the experimental device, and can also simulate clouds and fog in the air, providing certain guiding significance for corresponding research.

Description

Technical Field

[0001] The invention belongs to the technical field of polarized light scattering characteristic measurement and analysis and photoelectric imaging, and in particular relates to an indoor simulation device for measuring target pBRDF characteristics in a sea fog environment and a use method thereof. Background Art

[0002] The ocean occupies about 71% of the earth's total area. With the development and exploration of the ocean by countries around the world, various new technologies are constantly being proposed, such as radar detection, infrared imaging, etc. In terms of ocean detection and sea surface target identification, the use of optical measurement is intuitive and simple.

[0003] BRDF is a basic physical quantity that describes the optical reflection characteristics of a material surface, and plays an important role in research fields such as remote sensing of land objects, target identification and material classification, and computer image processing. In terms of marine development, calculating the polarization BRDF values ​​of sea surface targets under different parameters and monitoring the changes in marine information in real time are of great significance for marine ship search and rescue, sea surface object distinction, and marine environmental protection.

[0004] The spatial distribution of the target reflectivity is related to the characteristics of the radiation source and the reflective properties of the target. The ocean background environment is complex. Based on the microscopic analysis, sea fog, as one of the natural disaster weather, causes light to be constantly reflected and refracted at the surface micro-elements of the water fog particles, which seriously affects the normal transmission of light and causes a decrease in imaging contrast. In the past, the measurement of the bidirectional reflectance distribution function was mainly carried out indoors and outdoors under normal weather. Now, a target pBRDF measurement technology for sea fog environment is proposed. This technology has three shortcomings: foggy weather occurs randomly, and experiments cannot be carried out at any time; and experiments at the seaside require a lot of money and manpower; the sea fog concentration cannot be controlled, the experimental record data lacks integrity, and a database of all parameter conditions cannot be quickly established. Therefore, a new indoor simulation measurement device is urgently needed in the existing technical solutions to solve these problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to provide a simulation device for measuring the pBRDF of a sea surface target and a method for using the same, to simulate the fog generated on the ocean surface indoors using water vapor and NaCl particles, so as to replace the experiment that must be measured on the ocean field, and to measure the transmission characteristics of polarized light reflected from the target surface at different zenith angles and azimuth angles under the influence of sea fog medium, to confirm the interference of sea fog particles on the light scattering process, and to provide a theoretical basis and real data support for the selection and numerical simulation of the target polarization BRDF model in a real ocean environment.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of a simulation device for measuring pBRDF of a sea surface target and its use method of the present invention is as follows:

[0007] A simulation device for measuring pBRDF of a sea surface target, comprising a ground rotating measurement frame, a sea surface scene simulation device, a polarized light transmitting system, a receiving system and an information processing system, wherein the polarized light transmitting system and the receiving system are both installed on the ground rotating measurement frame;

[0008] The polarized light transmitting system and receiving system are arranged around the sea scene simulation device, and perform circular motion around the sample to be measured within a certain range on a ground rotating measuring frame;

[0009] The range of motion of the polarized light transmitting system is smaller than that of the receiving system;

[0010] The receiving system is electrically connected to the information processing system.

[0011] Further, the ground rotating measuring frame is composed of a 360° azimuth circular track, a 180° zenith arc semicircular slide rail I, and a 180° zenith arc semicircular slide rail II. The 180° zenith arc semicircular slide rail I and the 180° zenith arc semicircular slide rail II are both slidably connected to the 360° azimuth circular track, and the diameter of the 180° zenith arc semicircular slide rail II is greater than the diameter of the 180° zenith arc semicircular slide rail I.

[0012] The polarized light transmitting system is fixed on the 180° zenith arc semicircular slide rail Ⅰ, and the receiving system is fixed on the 180° zenith arc semicircular slide rail Ⅱ.

[0013] Furthermore, the sea scene simulation device includes a water tank, an agitator, a mist filling conduit, a bracket, a transparent semicircular glass ball, a sample stage, a humidity detector and a humidity display; the water tank is provided with an opening for pouring NaCl particles and pure water, and the bottom is provided with an agitator; one end of the transparent semicircular glass ball is provided with a mist filling conduit hole, and the glass ball is connected to the water tank through the mist filling conduit; a bracket is provided at the bottom of the glass ball, and a sample stage is provided on the bracket;

[0014] A water mist concentration detector probe is arranged at the other end of the glass ball, and the probe is electrically connected to a water mist concentration display device outside the glass ball.

[0015] Furthermore, the polarized light emission system comprises a light source fixed on a cross-shaped iron rod, a beam splitter, an aperture I, an optical power meter, a polarizer, a 1 / 4 glass plate and an aperture II;

[0016] The light source, beam splitter, polarizer, 1 / 4 glass plate, and aperture II are coaxial and arranged longitudinally;

[0017] The beam splitter, aperture I and optical power meter are coaxial and arranged transversely;

[0018] After the optical axis of the light source passes through the beam splitter, there is always a beam of light irradiating the optical power meter and the center of the sample to be measured.

[0019] Furthermore, the receiving system includes a spectrometer and a polarization camera installed on a 180° zenith arc semicircular slide rail II, and the spectrometer and the polarization camera are arranged horizontally.

[0020] Furthermore, the information processing system includes a computer for collecting and calculating data from the receiving system and saving the data in a fixed naming format.

[0021] The present invention also provides a method for using a simulation device for measuring pBRDF of a sea surface target, using the indoor sea fog simulation device as described in any one of claims 1 to 6, and the steps of the measurement method are as follows, and the following steps are performed in sequence:

[0022] Step 1: Set the incident polarized light in a fog-free environment:

[0023] Fix all experimental equipment, calibrate the zero position of the circular track, keep the room in a completely dark environment, turn on the light source, and use the light source plus polarizer to obtain linearly polarized light with a wide spectrum (400nm~760nm); first, adjust the polarizer to obtain linearly polarized light with a vibration direction of 0°, so that the 0° linearly polarized light passes through aperture II and hits the center of the sample stage; another beam of light passes through aperture I and directly hits the optical power meter, observe the reading and keep it stable;

[0024] Step 2: Set the variable to the outgoing azimuth:

[0025] Open the glass ball, place the sample on the sample stage, and close the glass ball; keep the 180° zenith arc semicircular slide rail I stationary to fix the incident zenith angle and incident azimuth angle; keep the 180° zenith arc semicircular slide rail I and the 180° zenith arc semicircular slide rail II stationary to keep the exit zenith angle unchanged, and set the initial value to 0°; drive the motor on the 360° azimuth circular track, measure 12 positions at intervals of 30°, and the receiving system measures the sample scattering spectrum L s And take the image to save;

[0026] Step 3: Set the variable to the exit zenith angle:

[0027] Keep the 180° zenith arc semicircular slide rail I stationary to fix the incident zenith angle and incident azimuth angle; drive the 180° zenith arc semicircular slide rail II motor to change the exit zenith angle to 15°, and repeat step 2; change the exit zenith angle in turn, with an interval of 15°, and repeat step 2 for a total of 12 times; the receiving system measures the sample scattering spectrum L s And take the image to save;

[0028] Step 4: Set the variable to the incident zenith angle:

[0029] Drive the 180° zenith arc semicircular slide rail I motor to change the light source position to change the incident zenith angle, and repeat experimental steps 2 and 3;

[0030] Step 5: Calculate the target pBRDF data in a fog-free environment:

[0031] The information processing system obtains the sample scattering spectrum L from the receiving system s and the scattering spectrum of the calibration plate L b Substitute the following formula:

[0032]

[0033] Where θ and φ represent the zenith angle and azimuth angle respectively, the subscripts i and r represent the incident direction and detection direction respectively, ρ(λ) is the hemispherical reflectivity of the calibration plate, and a standard white plate close to the Lambertian body is selected as the reference plate. The material is polytetrafluoroethylene. The information processing system calculates the sample pBRDF value and the corresponding image and saves them;

[0034] Step 6: Measure the target pBRDF data under different water mist humidity environments:

[0035] Fill the glass ball with water mist of different humidity as needed, and repeat the experimental steps 2 to 5; the information processing system calculates the sample pBRDF value and the corresponding image, and saves them;

[0036] Step 7: Measure the target pBRDF data under different NaCl solution concentrations:

[0037] Prepare different concentrations of NaCl solution as needed, and repeat the experimental step six; the information processing system calculates the sample pBRDF value and the corresponding image, and saves them;

[0038] Step 8: Use the light source plus polarizer method, and continue to obtain linear polarized light with vibration directions of 45°, 90°, and 135° by rotating the polarizer; use the light source plus polarizer plus 1 / 4 glass slide method to obtain wide-band circularly polarized light, and by rotating the polarizer to 45° and 135°, adjust the angle between the fast axis of the glass slide and the vibration direction of the polarizer to 45°, and obtain right-handed and left-handed circularly polarized light respectively. Repeat experimental steps 2 to 6 for each selection of a polarization angle, for a total of five large cycles;

[0039] Step 9: End the measurement experiment:

[0040] Turn off the polarized light transmitting system, receiving system, and information processing system, drain the gas in the transparent semicircular glass ball, wipe off any remaining water stains on the equipment, and put away the measuring equipment to end the experiment.

[0041] A simulation device for measuring pBRDF of a sea surface target and a method for using the same have the following advantages: an indoor simulation device and a measurement method for measuring pBRDF of a sea surface target, which use water vapor and NaCl particles indoors to simulate fog generated on the ocean surface, to replace experiments that must be measured on the ocean field, and are used to measure the transmission characteristics of polarized light reflected from the target surface at different zenith angles and azimuth angles under the influence of sea fog medium, to confirm the interference of sea fog particles on the light scattering process, and to provide a theoretical basis and real data support for the selection and numerical simulation of a target pBRDF model in a real ocean environment.

[0042] It is also possible to establish a pBRDF database of sea surface targets with different water mist humidity under different salt particle concentrations based on the measurement results of the experimental device. During marine target identification such as ship search and rescue, the real-time sea surface salt particle concentration and water mist humidity can be determined. The pBRDF value of the sea surface target measured by the receiving equipment can be searched for the corresponding pBRDF value of the target in the database to determine the material and location of the measured target.

[0043] The present invention can also change the water mist into smoke to simulate clouds in the air, which has a certain guiding significance for searching for targets in the sky such as airplanes. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The present invention is a schematic structural block diagram of a simulation device for measuring pBRDF of sea surface targets.

[0045] Figure 2 It is a schematic structural diagram of the ground rotating measuring frame of the present invention.

[0046] Explanation of the marks in the figure: 1. Ground rotating measurement frame; 10. 360° azimuth circular track; 11. 180° zenith arc semicircular slide track I; 12. 180° zenith arc semicircular slide track II; 2. Sea surface scene simulation device; 20-water tank; 21. Stirrer; 22. Mist filling pipe; 23. Bracket; 24. Transparent semicircular glass ball; 25. Sample stage; 26. Humidity detector; 27. Humidity display; 3. Polarized light emission system; 30. Light source; 31. Beam splitter; 32. Aperture I; 33. Optical power meter; 34. Polarizer; 35. 1 / 4 glass slide; 36. Aperture II; 4. Receiving system; 40. Spectrometer; 41. Polarization camera; 5. Information processing system; 50. Computer. DETAILED DESCRIPTION

[0047] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a simulation device for measuring pBRDF of a sea surface target and a method of using the same in conjunction with the accompanying drawings.

[0048] A simulation device and a measurement method for measuring pBRDF of a sea surface target, wherein the simulation device is as follows Figure 1 As shown, a ground rotating measurement frame 1, a sea scene simulation device 2, a polarized light transmitting system 3, a receiving system 4 and an information processing system 5, wherein the transmitting system 3 and the receiving system 4 are both installed on the ground rotating measurement frame 1;

[0049] The polarized light transmitting system 3 and the receiving system 4 are arranged around the sea scene simulation device 2, and perform circular motion around the sample to be measured within a certain range on the ground rotating measuring frame 1;

[0050] The motion range of the polarized light transmitting system 3 is smaller than the motion range of the receiving system 4;

[0051] The receiving system 4 is electrically connected to the information processing system 5 .

[0052] In this embodiment, the ground rotating measuring frame 1 is composed of a 360° azimuth circular track 10, a 180° zenith arc semicircular slide rail I11, and a 180° zenith arc semicircular slide rail II12. The 180° zenith arc semicircular slide rail I11 and the 180° zenith arc semicircular slide rail II12 are both slidably connected to the 360° azimuth circular track 10, and the diameter of the 180° zenith arc semicircular slide rail II12 is greater than the diameter of the 180° zenith arc semicircular slide rail I11.

[0053] The polarized light transmitting system 3 is fixed on the 180° zenith arc semicircular slide rail Ⅰ11, and the receiving system 4 is fixed on the 180° zenith arc semicircular slide rail Ⅱ12. The 180° zenith arc semicircular slide rail Ⅰ11 and the 180° zenith arc semicircular slide rail Ⅱ12 are used to fix the polarized light transmitting system 3 and the receiving system 4 and to control the changes of the zenith angle and the azimuth angle.

[0054] In this embodiment, the sea scene simulation device 2 includes a water tank 20, an agitator 21, a mist filling duct 22, a bracket 23, a transparent semicircular glass ball 24, a sample table 25, a humidity detector 26 and a humidity display 27; an opening for pouring NaCl particles and pure water is provided on the left side of the upper end of the water tank 20, and the ratio of the NaCl gram and the water is calculated and poured into the water tank 20, and an agitator 21 is provided at the bottom, and the stirring switch is driven to mix the solution concentration uniformly and then turned off;

[0055] The left end of the transparent semicircular glass ball 24 is provided with a hole for a mist filling conduit 22, so that the glass ball 24 is connected to the water tank 20 and filled with evenly stirred water mist; a bracket 23 is placed at the middle end of the bottom of the glass ball 24, and a sample table 25 is placed on the bracket 23; a humidity detector 26 is placed at the right end of the glass ball 24, and the humidity detector 26 is electrically connected to a humidity display 27 outside the glass ball 24. When the humidity display 27 reaches a specified humidity, the water mist filling is stopped; the glass ball 24 can be opened and closed to place samples, and the glass material has a polarization-maintaining characteristic.

[0056] In this embodiment, the polarized light emitting system 3 includes a light source 30 fixed on a cross-shaped iron rod 37, a beam splitter 31, an aperture I 32, an optical power meter 33, a polarizer 34, a 1 / 4 glass plate 35 and an aperture II 36;

[0057] The light source 30, beam splitter 31, polarizer 34, 1 / 4 glass plate 35, and aperture II 36 are coaxial and arranged longitudinally;

[0058] The beam splitter 31, the aperture I 32, and the optical power meter 33 are coaxial and arranged horizontally;

[0059] After the optical axis of the light source 30 passes through the beam splitter 31, there is always a beam of light irradiating the center of the sample to be measured; after the optical axis of the light source 30 passes through the beam splitter 31, there is always a beam of light irradiating the optical power meter 33, which can detect the stability of the incident light source. If the reading of the optical power meter 33 jumps too much, you can replace the light source with the same transmission power and continue the measurement, or pause the measurement process and continue the measurement after the reading stabilizes.

[0060] In this embodiment, the receiving system 4 includes a spectrometer 40 and a polarization camera 41 installed on a 180° zenith arc semicircular slide rail II 12, and the spectrometer 40 and the polarization camera 41 are arranged horizontally; the spectrometer 40 is used to measure the target outgoing polarization scattering spectrum L; the polarization camera 41 is used to capture the target imaging state at a fixed angle.

[0061] In this embodiment, the information processing system 5 includes a computer 50 for collecting and calculating data from the receiving system 4 and storing the data in a fixed naming format.

[0062] A method for using a simulation device for measuring pBRDF of a sea surface target comprises the following steps, which are performed in sequence:

[0063] Step 1: Set the incident polarized light in a fog-free environment

[0064] Fix all experimental equipment, calibrate the zero position of the circular track, keep the room completely dark, turn on the light source 30, and use the light source 30 plus the polarizer 34 to obtain linear polarized light with a wide spectrum (400nm~760nm). First, adjust the polarizer 34 to obtain linear polarized light with a vibration direction of 0°, so that the 0° linear polarized light passes through the aperture II 36 and hits the center of the sample stage 25; another beam of light passes through the aperture I 32 and directly hits the optical power meter 33, observe the reading and keep it stable.

[0065] Step 2: Set the variable to the outgoing azimuth

[0066] Open the transparent semicircular glass ball 24, place the sample on the sample stage 25, and close the glass ball 24. Keep the 180° zenith arc semicircular slide rail Ⅰ11 stationary to fix the incident zenith angle and the incident azimuth angle. Keep the 180° zenith arc semicircular slide rail Ⅰ11 and the 180° zenith arc semicircular slide rail Ⅱ12 stationary to keep the exit zenith angle unchanged, and set the initial value to 0°. Drive the motor on the 360° azimuth circular track 10, and measure 12 positions at intervals of 30°. The receiving system measures the sample scattering spectrum L s And take an image to save it.

[0067] Step 3: Set the variable to the exit zenith angle

[0068] Keep the 180° zenith arc semicircular slide rail Ⅰ11 stationary to fix the incident zenith angle and incident azimuth angle; drive the 180° zenith arc semicircular slide rail Ⅱ12 motor to change the exit zenith angle to 15°, and repeat step 2; change the exit zenith angle in turn, with an interval of 15°, and repeat the experimental step 2 for a total of 12 times; the receiving system measures the sample scattering spectrum L s And take the image to save;

[0069] Step 4: Set the variable to the incident zenith angle

[0070] Drive the 180° zenith arc semicircular slide rail Ⅰ11 motor to change the position of the light source 30 to change the incident zenith angle, and repeat the experimental steps two and three.

[0071] Step 5: Calculate the target pBRDF data in a fog-free environment

[0072] The information processing system 5 obtains the sample scattering spectrum L from the receiving system 4 s and the scattering spectrum of the calibration plate L b Substitute the following formula:

[0073]

[0074] Where θ and φ represent the zenith angle and azimuth angle, respectively; the subscripts i and r represent the incident direction and the detection direction, respectively; ρ(λ) is the hemispherical reflectivity of the calibration plate; a standard white plate close to the Lambertian body is selected as the reference plate, and the material is polytetrafluoroethylene. The information processing system 5 calculates the sample pBRDF value and the corresponding image, and uniformly names and saves them in the form of "no water fog-material name-incident zenith angle-exit zenith angle-exit azimuth angle".

[0075] Step 6: Measure the target pBRDF data under different water mist humidity environments

[0076] The transparent semicircular glass ball 24 is filled with water mist of different humidity as needed, and experimental steps 2 to 5 are repeated; the information processing system 5 calculates the sample pBRDF value and the corresponding image, and saves them in a unified name in the form of "water mist-humidity-material name-incident zenith angle-exit zenith angle-exit azimuth angle".

[0077] Step 7: Measure the target pBRDF data at different NaCl solution concentrations

[0078] Prepare different concentrations of NaCl solution as needed and repeat the experimental step six; the information processing system 5 calculates the sample pBRDF value and the corresponding image, and saves them in a unified name in the form of "salt spray-concentration-humidity-material name-incident zenith angle-exit zenith angle-exit azimuth angle".

[0079] Step 8: Change the polarization angle

[0080] By using the light source 30 plus the polarizer 34, by rotating the polarizer 34, linear polarized light with vibration directions of 45, 90 and 135 is continuously obtained; by using the light source 30 plus the polarizer 34 plus the 1 / 4 glass plate 35, circular polarized light with a wide spectrum is obtained, by rotating the polarizer to 45° and 135°, adjusting the angle between the fast axis of the glass plate 35 and the vibration direction of the polarizer to 45°, right-handed and left-handed circular polarized light are obtained respectively. Each time a polarization angle is selected, experimental steps 2 to 6 are repeated, for a total of five large cycles;

[0081] Step 9: End the measurement experiment

[0082] Turn off the polarized light transmitting system 3, the receiving system 4, and the information processing system 5, drain the gas in the transparent semicircular glass ball 24, wipe off the remaining water stains on the equipment, and put away the measuring equipment to end the experiment.

[0083] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A method for using a simulation device for measuring pBRDF of a sea surface target, characterized in that: The steps of the measurement method are as follows, and the following steps are performed in sequence: Step 1: Set the incident polarized light in a fog-free environment: Fix all experimental equipment, calibrate the zero position of the circular track, maintain a completely dark environment indoors, turn on the light source (30), and use the light source (30) plus a polarizer (34) to obtain linearly polarized light with a wide spectrum; first, adjust the polarizer (34) to obtain linearly polarized light with a vibration direction of 0°, so that the 0° linearly polarized light passes through aperture II (36) and hits the center of the sample stage (25); another beam of light passes through aperture I (32) and directly hits the optical power meter (33), and observes the reading and keeps it stable; Step 2: Set the variable to the outgoing azimuth: Open the glass ball (24), place the sample on the sample stage (25), and close the glass ball (24); keep the 180° zenith arc semicircular slide rail I (11) stationary so that the incident zenith angle and the incident azimuth angle are fixed; keep the 180° zenith arc semicircular slide rail I (11) and the 180° zenith arc semicircular slide rail II (12) stationary so that the exit zenith angle remains unchanged, and the initial value is set to 0°; drive the motor on the 360° azimuth circular track (10) to measure 12 position points at intervals of 30°, and the receiving system measures the sample scattering spectrum L s And take the image to save; Step 3: Set the variable to the exit zenith angle: Keep the 180° zenith arc semicircular slide rail I (11) stationary to keep the incident zenith angle and the incident azimuth angle fixed; drive the 180° zenith arc semicircular slide rail II (12) motor to change the exit zenith angle to 15°, and repeat step 2; change the exit zenith angle in turn, with an interval of 15°, and repeat step 2 for a total of 12 times; the receiving system measures the sample scattering spectrum L s And take the image to save; Step 4: Set the variable to the incident zenith angle: Drive the motor of the 180° zenith arc semicircular slide rail I (11) to change the position of the light source (30) so that the incident zenith angle changes, and repeat the experimental steps 2 and 3; Step 5: Calculate the target pBRDF data in a fog-free environment: The information processing system (5) obtains the sample scattering spectrum L from the receiving system (4). s and the scattering spectrum of the calibration plate L b Substitute the following formula: Where θ and φ represent the zenith angle and azimuth angle respectively, the subscripts i and r represent the incident direction and the detection direction respectively, ρ(λ) is the hemispherical reflectivity of the calibration plate, and a standard white plate close to the Lambertian body is selected as the reference plate, and the material is polytetrafluoroethylene. The information processing system (5) calculates the sample pBRDF value and the corresponding image, and saves them; Step 6: Measure the target pBRDF data under different water mist humidity environments: The glass ball (24) is filled with water mist of different humidity as required, and experimental steps 2 to 5 are repeated; the information processing system (5) calculates the sample pBRDF value and the corresponding image, and saves them; Step 7: Measure the target pBRDF data under different NaCl solution concentrations: According to the need, different concentrations of NaCl solution are prepared and the experimental step six is ​​repeated; the information processing system (5) calculates the sample pBRDF value and the corresponding image and saves them; Step 8: Using a light source (30) plus a polarizer (34), by rotating the polarizer (34), continue to obtain linear polarized light with vibration directions of 45°, 90° and 135°; using a light source (30) plus a polarizer (34) plus a 1 / 4 glass plate (35), obtain circularly polarized light with a wide spectrum, by rotating the polarizer to 45° and 135°, adjusting the angle between the fast axis of the glass plate (35) and the vibration direction of the polarizer to 45°, respectively obtain right-handed and left-handed circularly polarized light; each time a polarization angle is selected, experimental steps 2 to 6 are repeated, for a total of five large cycles; Step 9: End the measurement experiment: Turn off the polarized light transmitting system (3), receiving system (4), and information processing system (5), drain the gas in the transparent semicircular glass ball (24), wipe off the remaining water stains on the equipment, and put away the measuring equipment to end the experiment; The simulation device for measuring the pBRDF of a sea surface target comprises a ground rotating measurement frame (1), a sea surface scene simulation device (2), a polarized light transmitting system (3), a receiving system (4) and an information processing system (5), wherein the polarized light transmitting system (3) and the receiving system (4) are both installed on the ground rotating measurement frame (1); The polarized light transmitting system (3) and the receiving system (4) are arranged around the sea scene simulation device (2), and perform circular motion around the sample to be measured within a certain range on the ground rotating measurement frame (1); The motion range of the polarized light transmitting system (3) is smaller than the motion range of the receiving system (4); The receiving system (4) is electrically connected to the information processing system (5).

2. The method for using the simulation device for measuring pBRDF of a sea surface target according to claim 1, characterized in that: The ground rotating measuring frame (1) is composed of a 360° azimuth circular track (10), a 180° zenith arc semicircular slide rail I (11), and a 180° zenith arc semicircular slide rail II (12); the 180° zenith arc semicircular slide rail I (11) and the 180° zenith arc semicircular slide rail II (12) are both slidably connected to the 360° azimuth circular track (10); the diameter of the 180° zenith arc semicircular slide rail II (12) is greater than the diameter of the 180° zenith arc semicircular slide rail I (11); The polarized light transmitting system (3) is fixed on a 180° zenith arc semicircular slide rail I (11), and the receiving system (4) is fixed on a 180° zenith arc semicircular slide rail II (12).

3. The method for using the simulation device for measuring pBRDF of a sea surface target according to claim 1, characterized in that: The sea scene simulation device (2) comprises a water tank (20), a stirrer (21), a mist filling conduit (22), a bracket (23), a transparent semicircular glass ball (24), a sample stand (25), a humidity detector (26) and a humidity display (27); the water tank (20) is provided with an opening for pouring NaCl particles and pure water, and the bottom is provided with a stirrer (21); one end of the transparent semicircular glass ball (24) is provided with an opening for the mist filling conduit (22), and the glass ball (24) is connected to the water tank (20) via the mist filling conduit (22); A support (23) is arranged at the bottom of the glass ball (24), and a sample table (25) is arranged on the support (23); a humidity detector (26) is arranged at the other end of the glass ball (24), and the humidity detector (26) is electrically connected to a humidity display (27) outside the glass ball (24).

4. The method for using the simulation device for measuring pBRDF of a sea surface target according to claim 1, characterized in that: The polarized light emission system (3) comprises a light source (30) fixed on a cross-shaped iron rod (37), a beam splitter (31), an aperture I (32), an optical power meter (33), a polarizer (34), a 1 / 4 glass plate (35) and an aperture II (36); The light source (30), beam splitter (31), polarizer (34), 1 / 4 glass plate (35), and aperture II (36) are coaxial and arranged longitudinally; The beam splitter (31), aperture I (32), and optical power meter (33) are coaxial and arranged in a transverse direction; After the optical axis of the light source (30) passes through the beam splitter (31), a beam of light always irradiates the optical power meter (33) and the center of the sample to be measured.

5. The method for using the simulation device for measuring pBRDF of a sea surface target according to claim 1, characterized in that: The receiving system (4) comprises a spectrometer (40) and a polarization camera (41) installed on a 180° zenith arc semicircular slide rail II (12), and the spectrometer (40) and the polarization camera (41) are arranged horizontally.

6. The method for using the simulation device for measuring pBRDF of a sea surface target according to claim 1, characterized in that: The information processing system (5) includes a computer (50) for collecting and calculating data from the receiving system (4), and storing the data in a fixed naming format.

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