Simulation test method for evaluating range finding performance of laser range finder

Abstract

The invention discloses a simulation test method for evaluating the range finding performance of a laser range finder, and the method comprises the following steps: a to-be-tested laser range finder is fixed on a fixing jig provided with simulation receiving and transmitting installation positions, and the two installation positions are respectively corresponding to a receiving probe and a transmitting probe; a calibration unit with a first reference mark of a first lighting assembly calibrates a receiving light path by simulating the relative position of a receiving mounting position, and the focusing of a receiving end is finely adjusted; a calibration unit with a second reference mark of a second lighting assembly is used for calibrating an emission light path by simulating the relative position of an emission installation position, and the beam expanding multiplying power of an emission end is set; and selecting an analog signal processing link according to the to-be-simulated target distance. The method comprises the following steps: fixing equipment, calibrating an optical path, selecting an analog signal processing link, attenuating a simulation ranging optical signal, coupling noise light and the like, finally finishing simulation ranging and recording an analysis result, and comprehensively and truly simulating the actual working condition of the laser range finder.

Description

Technical Field

[0001] This invention relates to the field of laser rangefinder testing technology, and in particular to a simulation test method for evaluating the ranging performance of laser rangefinders. Background Technology

[0002] Performance evaluation of laser rangefinders (including core indicators such as ranging accuracy, maximum range, and anti-interference capability) is a crucial step in their research, design, manufacturing, and quality control. Currently, the industry commonly uses two main testing methods, each with significant limitations:

[0003] 1. Outdoor field testing method:

[0004] This method places the laser rangefinder in a real-world environment to directly measure actual targets (such as buildings, mountains, and landmarks). While this method can reflect the device's performance in real-world scenarios to some extent, its inherent limitations severely restrict the effectiveness and reliability of the test.

[0005] (1) Uncontrollable environmental interference factors: During the test, there are a variety of uncontrollable environmental variables, including weather conditions (such as rain, fog, haze, etc.), atmospheric turbulence effect, background light intensity change, etc. These factors will significantly interfere with the test results, making it difficult to accurately distinguish the impact of equipment performance defects and environmental noise.

[0006] (2) Test conditions are difficult to reproduce: Key test parameters such as target distance, target reflectivity, and ambient light intensity cannot be precisely controlled and repeatedly set, resulting in a lack of comparability between test data from different batches, which seriously affects the scientificity and validity of the test results.

[0007] (3) High cost of test implementation: It is necessary to find a suitable test site and coordinate a suitable test time window. Especially for ultra-long distance (e.g., more than 5 kilometers) tests or extreme environment (high and low temperature, strong vibration, etc.) tests, the difficulty and cost of organizing and implementing them increase exponentially.

[0008] 2. Laboratory simulation testing method:

[0009] To overcome the many drawbacks of outdoor field testing, existing technologies attempt to simulate the laser ranging process in a controlled laboratory environment. However, current mainstream simulation testing methods still suffer from prominent problems such as limited functionality, insufficient accuracy, and poor flexibility.

[0010] (1) Low efficiency of optical calibration and alignment: The existing system relies too much on manual visual judgment and manual mechanical adjustment during the initial calibration of the optical path, and lacks efficient reference mark illumination and dynamic focusing / beam adjustment mechanism, which makes the calibration process time-consuming and laborious and prone to human error.

[0011] (2) There is a significant gap in distance simulation capabilities:

[0012] Short-distance simulation (≤1km): mainly uses fixed-length fiber delay lines or preset optical reflection path schemes, which cannot achieve continuous adjustment of the delay amount, and the simulation accuracy is severely limited by the fiber dispersion characteristics and the long-term stability of optical components.

[0013] Long-distance simulation (>1km): A pure digital signal generation and electronic delay scheme is usually used. Although it can achieve ultra-long-distance simulation, the accuracy is insufficient in short-distance simulation (mainly limited by the quantization error of ADC / DAC and system clock jitter), and it cannot truly reproduce the waveform characteristics of the original laser signal (such as pulse width, rise time and other key parameters).

[0014] (3) Inadequate environmental simulation function: The existing system lacks an effective simulation mechanism for the dynamic attenuation law of the energy of the returned light signal with distance / reflectivity, as well as the ability to control the injection of complex environmental noise (such as background light interference, rain and fog scattering effect, multipath reflection, etc.), making it difficult to comprehensively evaluate the anti-interference performance and robustness of the rangefinder in various real scenarios.

[0015] (4) Lack of standardization in testing process: Key testing links such as optical calibration, signal generation, and environmental simulation have not yet formed integrated and standardized operating methods, resulting in low testing efficiency, poor consistency of test results, and difficulty in meeting the efficiency and reliability requirements of modern production lines for batch testing. Summary of the Invention

[0016] The purpose of this invention is to propose a simulation testing method for evaluating the ranging performance of laser rangefinders. This method aims to overcome the limitations of existing outdoor field testing and laboratory simulation testing methods, providing a more accurate, efficient, stable, and comprehensive solution for evaluating the performance of laser rangefinders. Through a series of scientifically sound steps, from fixing the device under test and calibrating the optical path, to selecting the simulation signal processing link according to different target distances, to attenuating and coupling noise light onto the generated simulated ranging optical signal, and finally completing the simulated ranging and recording the analysis results, this method can comprehensively and realistically simulate the working conditions of laser rangefinders in various real-world scenarios.

[0017] To achieve the above objectives, this invention discloses a simulation test method for evaluating the ranging performance of a laser rangefinder, the key of which includes the following steps:

[0018] S1: Fix the laser rangefinder under test to the fixed fixture, which has a simulated receiving mounting position and a simulated transmitting mounting position, corresponding to the receiving probe and transmitting probe of the laser rangefinder under test, respectively;

[0019] S2: The receiving optical path is calibrated using a calibration unit set at a relative position to the analog receiver mounting position. The calibration unit includes a first reference mark with a first illumination component and fine-tunes the focus of the receiver end.

[0020] S3: The emission optical path is calibrated using a calibration unit set at a relative position to the simulated emission mounting position. The calibration unit includes a second reference mark with a second illumination component and sets the beam expansion ratio at the emission end.

[0021] S4: Select the analog signal processing link based on the distance to the target to be simulated:

[0022] If the target distance is ≤1km, activate the short-range simulated link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; amplify and power divide the electrical signal; modulate the power-divided signal onto the optical fiber signal; delay the optical signal through an adjustable optical fiber delay line to simulate the signal transmission distance; convert the delayed optical signal back into an electrical signal; amplify the electrical signal; modulate the amplified electrical signal onto the simulated ranging optical signal;

[0023] If the target distance is >1km, activate the long-distance analog link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; perform high-speed ADC sampling on the electrical signal; use a high-speed FPGA to perform waveform fitting on the sampled signal; perform digital delay processing according to the delay time set by the digital timer; drive the high-speed DAC to output the delayed analog waveform; modulate the waveform output by the DAC onto the simulated ranging optical signal;

[0024] S5: Adjust the optical attenuation of the simulated ranging optical signal generated in step S4 to control its output optical power and simulate the return signal energy at different distances.

[0025] S6: Couple the power-adjustable noisy light to the simulated ranging light signal in step S5 to simulate environmental interference;

[0026] S7: The simulated ranging optical signal, after attenuation and noise optical coupling, is transmitted through the simulated transmission mounting position of the fixed fixture and the transmission optical path;

[0027] S8: The simulated ranging optical signal propagates through space and is received by the receiving probe of the laser rangefinder under test to complete the simulated ranging;

[0028] S9: Record and analyze the ranging results of the laser rangefinder under test, and evaluate its performance.

[0029] Furthermore, in step S5, the adjustable light attenuation dynamically adjusts the attenuation amount based on the target distance and the simulated target reflectivity.

[0030] Furthermore, in step S6, the power of the noise light is adjustable to simulate ambient background light or interference of different intensities.

[0031] Furthermore, in step S4 of enabling the long-distance analog link, when performing waveform fitting and delay processing using a high-speed FPGA, at least one of the following operations is also performed:

[0032] Simulated raindrop interference noise is superimposed on the fitted ranging signal waveform;

[0033] A delay signal simulating multipath effect is superimposed on the fitted ranging signal waveform;

[0034] The fitted ranging signal waveform is modulated to simulate atmospheric turbulence or attenuation effects.

[0035] Furthermore, in step S2, the fine-tuning of the receiving end focusing is achieved by adjusting the distance between the detector and the receiving lens group in the receiving optical path.

[0036] Furthermore, the objective lenses in the receiving lens assembly are respectively assembled in the first receiving lens barrel via the first pressure ring, and the first reference mark is provided at the tail end of the first receiving lens barrel; the detector is assembled in the second receiving lens barrel by means of a mounting plate, and the second receiving lens barrel is threadedly connected to the first receiving lens barrel; by rotating the second receiving lens barrel, the distance between the receiving lens assembly and the detector can be adjusted; a set screw for limiting the rotational position of the second receiving lens barrel is also provided between the second receiving lens barrel and the first receiving lens barrel.

[0037] Furthermore, in step S3, the setting of the beam expansion ratio of the transmitting end is achieved by adjusting the distance between the focal length adjustment objective lens and the transmitting lens group in the transmitting optical path.

[0038] Furthermore, the focal length adjustment objective lens is installed in the internal threaded sleeve via an external threaded retainer, and its installation position can be controlled by rotating the external threaded retainer. The internal threaded sleeve is fixed in the second emitting lens barrel. The emitting lens assembly is assembled and fixed in the second emitting lens barrel by means of a second pressure ring.

[0039] Furthermore, at the entrance of the second lens tube, the first lens tube is coaxially and detachably connected by screws; the entrance of the first lens tube is equipped with a light source and a second reference mark in sequence according to the simulated light path emission direction via a mounting base.

[0040] Furthermore, in steps S2 and S3, both the first and second reference marks utilize cross-shaped reticles that facilitate optical axis calibration.

[0041] Compared with the prior art, the significant advantages of the present invention are:

[0042] I. In terms of optical calibration, this method employs a reference mark with an illumination component, combined with dynamic focusing and beam adjustment mechanisms, effectively improving the efficiency of optical calibration and alignment while reducing human error. For simulations at different distances, short-distance and long-distance simulation links are designed, overcoming the problem of fragmented distance simulation capabilities in existing laboratory simulation testing methods. This approach enables continuous adjustment of the delay, ensures the accuracy of simulations at different distances, and accurately reproduces the waveform characteristics of the original laser signal.

[0043] Second, regarding environmental simulation capabilities, this method can dynamically adjust the light attenuation based on the target distance and the simulated target reflectivity, simulating the variation of the returned light signal energy with distance and reflectivity. Simultaneously, it can couple adjustable-power noise light into the simulated ranging light signal to simulate various complex environmental noises, such as background light interference, rain and fog scattering effects, and multipath reflection, thereby comprehensively evaluating the rangefinder's anti-interference performance and robustness in different real-world scenarios.

[0044] 1. Short distance:

[0045] (1) The short-range full-link uses analog signals for modulation and demodulation, which can completely restore the measurement signal of the rangefinder, and has the characteristics of large dynamic range and high linearity;

[0046] (2) The short-distance full link is modulated and demodulated with analog signals, and the signal propagation delay is extremely low, so it can realize short-distance distance simulation;

[0047] (3) The short-distance full link uses analog signals for modulation and demodulation, so there is no jitter of digital signal transmission, and the delay is achieved by the fiber length and is independent of the clock signal, so it can achieve micron-level accuracy and repeatability.

[0048] 2. Long distance:

[0049] (1) The ranging signal after digital conversion is digitally delayed, which can reduce the length and volume of the optical fiber when performing long-distance simulation;

[0050] (2) Long-distance digital simulation makes it easy to add other interference signals, such as raindrops and multipath signals, which can more realistically simulate the test environment;

[0051] (3) Digital simulation can simulate the impact of the atmospheric environment on the original waveform of the ranging measurement during long-distance ranging. Theoretically, the delay distance of digital simulation can be as long as tens of thousands of kilometers;

[0052] Thirdly, regarding the testing process, this invention achieves standardization and integration. From fixing the device under test and calibrating the optical path, to selecting analog signal processing links for different distances, to signal attenuation, noise coupling, and finally, analog ranging and result recording and analysis, a complete and standardized operating procedure is formed. This makes the testing process more efficient, reduces the impact of human factors on the test results, and improves the consistency and reliability of the test results, effectively meeting the efficiency and reliability requirements of modern production lines for batch testing.

[0053] Furthermore, this simulation testing method possesses excellent scalability and flexibility. Parameters such as target distance, target reflectivity, and environmental interference intensity can be flexibly adjusted according to different testing needs, enabling the simulation of more complex and varied real-world scenarios and providing more comprehensive and in-depth test data for laser rangefinder performance evaluation. Simultaneously, the hardware structure and components used in this method have a certain degree of versatility and compatibility, facilitating subsequent system upgrades and improvements to adapt to the ever-evolving laser ranging technology and testing requirements. Attached Figure Description

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0055] Figure 1 This is a functional flowchart of the simulation test method in Example 1;

[0056] Figure 2 This is a front view of the simulation test apparatus in Embodiment 1;

[0057] Figure 3 This is a top view of the simulation test apparatus in Embodiment 1;

[0058] Figure 4 yes Figure 2 Sectional view along line AA;

[0059] Figure 5 This is a schematic diagram of the internal structure of the receiving lens module in Embodiment 1 (I);

[0060] Figure 6 This is a schematic diagram (II) of the internal structure of the receiving lens module in Embodiment 1;

[0061] Figure 7 This is a front view of the receiving lens module in Embodiment 1;

[0062] Figure 8This is a top view of the receiving lens module in Embodiment 1;

[0063] Figure 9 This is a schematic diagram of the internal structure of the transmitting lens module in Embodiment 1 (I);

[0064] Figure 10 This is a schematic diagram (III) of the internal structure of the transmitting lens module in Embodiment 1;

[0065] Figure 11 This is a front view of the transmitting lens module in Embodiment 1;

[0066] The diagram is labeled: 1-fixed fixture, 101-simulated receiver mounting position, 102-simulated transmitter mounting position;

[0067] 2-Receiving lens module, 201-Receiving lens group, 202-First reference mark, 203-Optical attenuator, 204-Detector, 205-Focus fine-tuning structure, 206-First illumination assembly, 207-First receiving lens barrel, 208-Second receiving lens barrel, 209-Mounting plate, 210-Set screw, 211-First LED illumination lamp, 212-First power cable, 213-First pressure ring, 214-Horizontal base plate;

[0068] 3-Emitting lens module, 301-Light source, 302-Second reference mark, 303-Focus adjustment objective lens, 304-Emitting lens group, 305-Second illumination assembly, 306-Mounting base, 307-Mounting hole, 308-External threaded retaining ring, 309-Internal threaded sleeve, 310-Second pressure ring, 311-First transmitting lens barrel, 312-Second transmitting lens barrel, 313-Fine adjustment screw, 314-Second LED illumination lamp, 315-Second power cable, 316-Vertical base plate, 317-Mounting screw;

[0069] 4-Sliding stage, 5-Guide limiting structure, 6-Push-pull handle. Detailed Implementation

[0070] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0071] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0072] Figure 1 The first embodiment of the present invention is shown: a simulation test method for evaluating the ranging performance of a laser rangefinder, characterized by comprising the following steps:

[0073] S1: Fix the laser rangefinder under test to the fixed fixture 1. The fixed fixture is provided with a simulated receiving mounting position and a simulated transmitting mounting position, which correspond to the receiving probe and transmitting probe of the laser rangefinder under test, respectively.

[0074] S2: The receiving optical path is calibrated using a calibration unit set at a relative position to the analog receiver mounting position. The calibration unit includes a first reference mark with a first illumination component and fine-tunes the focus of the receiver end.

[0075] S3: The emission optical path is calibrated using a calibration unit set at a relative position to the simulated emission mounting position. The calibration unit includes a second reference mark with a second illumination component and sets the beam expansion ratio at the emission end.

[0076] S4: Select the analog signal processing link based on the distance to the target to be simulated:

[0077] If the target distance is ≤1km, activate the short-range simulated link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; amplify and power divide the electrical signal; modulate the power-divided signal onto the optical fiber signal; delay the optical signal through an adjustable optical fiber delay line to simulate the signal transmission distance; convert the delayed optical signal back into an electrical signal; amplify the electrical signal; modulate the amplified electrical signal onto the simulated ranging optical signal;

[0078] If the target distance is >1km, activate the long-distance analog link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; perform high-speed ADC sampling on the electrical signal; use a high-speed FPGA to perform waveform fitting on the sampled signal; perform digital delay processing according to the delay time set by the digital timer; drive the high-speed DAC to output the delayed analog waveform; modulate the waveform output by the DAC onto the simulated ranging optical signal;

[0079] S5: Adjust the optical attenuation of the simulated ranging optical signal generated in step S4 to control its output optical power and simulate the return signal energy at different distances.

[0080] S6: Couple the power-adjustable noisy light to the simulated ranging light signal in step S5 to simulate environmental interference;

[0081] S7: The simulated ranging optical signal, after attenuation and noise optical coupling, is transmitted through the simulated transmission mounting position of the fixed fixture and the transmission optical path;

[0082] S8: The simulated ranging optical signal propagates through space and is received by the receiving probe of the laser rangefinder under test to complete the simulated ranging;

[0083] S9: Record and analyze the ranging results of the laser rangefinder under test, and evaluate its performance.

[0084] In specific implementation, in step S5, the adjustable optical attenuation dynamically adjusts the attenuation amount based on the target distance and the simulated target reflectivity. This is because different target distances and reflectivities result in significant differences in the energy of the returned signal. For example, the farther the target distance, the greater the energy loss during laser propagation, and the weaker the returned signal energy; conversely, the lower the target reflectivity, the less energy is reflected back. By dynamically adjusting the attenuation amount, the returned signal energy under different real-world scenarios can be simulated more accurately. In actual operation, a suitable attenuation amount can be automatically calculated based on a pre-set algorithm, according to the input target distance and the simulated target reflectivity. For close-range targets with high reflectivity, the attenuation amount can be appropriately reduced; while for distant targets with low reflectivity, the attenuation amount needs to be increased. Simultaneously, to ensure the accuracy and stability of the adjustable optical attenuation, a high-precision optical attenuator can be used, and it should be calibrated and maintained regularly. This ensures that the output optical power of the simulated ranging optical signal can accurately reflect the actual situation under different distance and reflectivity conditions throughout the entire simulation test, thereby improving the reliability and effectiveness of the simulation test and making the evaluation of the ranging performance of the laser rangefinder more accurate and scientific.

[0085] In this embodiment, in step S6, the power of the noise light is adjustable to simulate ambient background light or interference of different intensities. By adjusting the power of the noise light, various complex environmental conditions such as strong sunlight on a sunny day, weak light on a cloudy day, and light interference at night can be simulated. When simulating strong sunlight on a sunny day, the noise light power is increased. At this time, the background light intensity is high, and a large amount of high-intensity interference light will be mixed into the signal received by the laser rangefinder under test, which will have a significant impact on its ranging accuracy. When simulating light interference at night, the noise light power is appropriately reduced to simulate a relatively weak but still interfering environment for ranging.

[0086] Specifically, in step S4 of enabling the long-distance analog link, when performing waveform fitting and delay processing using a high-speed FPGA, at least one of the following operations is also performed:

[0087] Simulated raindrop interference noise is superimposed on the fitted ranging signal waveform;

[0088] A delay signal simulating multipath effect is superimposed on the fitted ranging signal waveform;

[0089] The fitted ranging signal waveform is modulated to simulate atmospheric turbulence or attenuation effects.

[0090] When superimposing noise to simulate raindrop interference, the intensity and frequency distribution of the noise need to be determined based on the scattering and absorption characteristics of raindrops on the laser signal under different rainfall intensities. For example, in moderate rain, the raindrops are relatively dense, causing significant interference to the laser signal. In this case, the superimposed noise intensity should be appropriately increased, and the frequency distribution should be broader to more realistically simulate the impact of raindrops on the signal. In heavy rain simulations, the noise intensity needs to be further enhanced to reflect the severe interference of heavy rain on the laser ranging signal.

[0091] When superimposing delayed signals to simulate multipath effects, factors such as the material, distance, and angle of the reflector must be considered. Different materials have different reflectivities of laser signals, leading to changes in signal intensity and phase. For example, metallic reflectors have high reflectivity, resulting in a stronger reflected signal; while rough walls have low reflectivity, resulting in a weaker reflected signal. The distance and angle between the reflector and the laser rangefinder also affect the time and amplitude of the delayed signal. The greater the distance, the longer the delay; different angles result in different propagation paths for the reflected signal, thus affecting the signal intensity and phase.

[0092] When modulating the fitted ranging signal waveform to simulate atmospheric turbulence or attenuation effects, the physical properties of the atmosphere must be considered. Atmospheric turbulence distorts the wavefront of the laser signal, leading to random variations in signal intensity and phase. This effect can be simulated by randomly modulating the amplitude and phase of the waveform. Atmospheric attenuation, on the other hand, is related to factors such as the composition of gases, humidity, and temperature in the atmosphere. For example, in high humidity environments, water vapor strongly absorbs and scatters the laser signal, exacerbating signal attenuation. In this case, the attenuation effect can be simulated by reducing the amplitude of the waveform. By precisely executing these operations, the impact of various complex environments on the ranging performance of laser rangefinders can be simulated more comprehensively and accurately.

[0093] In this embodiment, in step S2, the fine-tuning of the receiving end focusing is achieved by adjusting the distance between the detector and the receiving lens group in the receiving optical path. Specifically, the objective lenses in the receiving lens group are respectively assembled in the first receiving lens barrel by the first pressure ring, and the first reference mark is provided at the tail end of the first receiving lens barrel; the detector is assembled in the second receiving lens barrel by means of a mounting plate, and the second receiving lens barrel is threadedly fitted into the first receiving lens barrel; by rotating the second receiving lens barrel, the distance between the receiving lens group and the detector can be adjusted; a set screw for limiting the rotational position of the second receiving lens barrel is also provided between the second receiving lens barrel and the first receiving lens barrel.

[0094] In specific implementation, the focal length adjustment objective lens is installed in an internally threaded sleeve via an externally threaded retainer, and its installation position can be controlled by rotating the externally threaded retainer. The internally threaded sleeve is fixed in the second emitting lens barrel. The emitting lens assembly is assembled and fixed in the second emitting lens barrel by means of a second pressure ring. Specifically, at the entrance of the second lens barrel, a first lens barrel is coaxially and detachably connected by screws. At the entrance of the first lens barrel, a light source and a second reference mark are sequentially assembled according to the simulated light path emission direction via a mounting base.

[0095] Preferably, in steps S2 and S3, both the first and second reference marks utilize cross-shaped reticles that facilitate optical axis calibration. Cross-shaped reticles offer high precision and stability, providing an accurate reference for optical axis calibration. In practice, operators can precisely adjust the direction and position of the optical axis by observing the relative positions of the reticle lines and the light rays. Optical axis calibration is considered complete when the light ray completely coincides with the center of the cross on the cross-shaped reticle or reaches a specific relative position.

[0096] In summary, this simulation testing method for evaluating the ranging performance of laser rangefinders has significant advantages and important value. It not only demonstrates good scalability and flexibility during the testing process, providing comprehensive and in-depth data for laser rangefinder performance evaluation, but also accurately simulates various complex real-world scenarios through detailed and scientifically designed procedures.

[0097] From a practical application perspective, this method can be widely used in the research, development, production, and quality inspection of laser rangefinders. During the research and development phase, it helps researchers gain a more comprehensive understanding of the performance of laser rangefinders under different environments and conditions, enabling targeted technological improvements and innovations. For example, by simulating environmental interference of varying intensities and complex signal propagation scenarios, researchers can analyze the sources and influencing factors of error in laser rangefinders under various harsh conditions, thereby optimizing their signal processing algorithms and hardware design to improve the accuracy and stability of distance measurement.

[0098] In the production process, this method can serve as an efficient quality inspection tool. Manufacturers can use this simulation testing method to evaluate the performance of each laser rangefinder, ensuring that the products meet quality standards. By recording and analyzing the ranging results, potential problems in the production process can be identified in a timely manner, such as assembly errors and unstable component performance, allowing for corresponding adjustments and improvements to enhance product yield and reliability.

[0099] For industries that use laser rangefinders, such as surveying, construction, and the military, this simulation testing method can also provide important reference data. These industries have high performance requirements for laser rangefinders, and the test data obtained through this method can help users select products that better suit their needs. At the same time, it can also provide users with suggestions and guidance on dealing with complex environments during actual use, improving work efficiency and measurement accuracy.

[0100] Furthermore, with the continuous development of laser ranging technology and the expansion of its application fields, this simulation testing method also has promising prospects. It is foreseeable that this method will be continuously improved and optimized in the future to adapt to the testing needs of higher precision and more complex environments. For example, it may further enhance the simulation of more special environmental factors, such as testing under high temperature, low temperature, and high altitude conditions, or combine artificial intelligence technology to achieve more intelligent test data analysis and evaluation.

[0101] In summary, this simulation testing method provides a comprehensive, scientific, and effective solution for evaluating the performance of laser rangefinders, which is of great significance for promoting the development and application of laser ranging technology.

[0102] Please see Figures 2 to 11 Based on the aforementioned method embodiment one, a simulation testing device is also disclosed for implementing a simulation testing method applied to evaluate the ranging performance of a laser rangefinder. The device includes a fixed fixture 1, which conforms to the outer contour shape of the laser rangefinder under test. Within the fixed fixture 1, a simulated receiving mounting position 101 and a simulated transmitting / receiving position are respectively provided corresponding to the transmitting and receiving probes of the laser rangefinder under test. A receiving lens module 2 and a transmitting lens module 3 are respectively provided relative to the simulated receiving mounting position 101 and the simulated transmitting mounting position 102. Wherein:

[0103] The receiving lens module 2 includes a receiving lens group 201, a first reference mark 202, an optical attenuator 203, and a detector 204 arranged sequentially along the optical path emission direction of the laser rangefinder under test. The emitting end of the detector 204 uses the crosshair of the first reference mark 202 to complete the optical axis deviation calibration. Between the detector 204 and the receiving lens group 201, the distance between them is adjusted by a focal length fine-tuning structure 205 to fine-tune the focusing of the emitting end of the detector 204. A first illumination component 206 is also provided relative to the first reference mark 202.

[0104] The transmitting lens module 3 includes a light source 301, a second reference mark 302, a focal length adjustment objective lens 303, and a transmitting lens group 304 arranged sequentially according to the simulated optical path emission direction. The light source 301 achieves fine adjustment of the optical axis deflection angle through a deflection fine-tuning mechanism to complete calibration under the indication of the second reference mark 302. The distance between the focal length adjustment objective lens 303 and the transmitting lens group 304 is adjustable to change the beam expansion ratio. A second illumination component 305 is also provided relative to the second reference mark 302. The detector 204 is responsible for receiving the laser ranging signal emitted by the laser rangefinder under test; the light source 301 is responsible for emitting the modulated simulated ranging light signal.

[0105] The working principle of this testing equipment is as follows: the laser beam emitted by the laser rangefinder under test enters the receiving lens module 2 through the simulated receiving mounting position 101. The laser beam first undergoes preliminary light focusing and adjustment through the receiving lens group 201, and then passes through the first reference mark 202. Its crosshair allows for convenient optical axis deviation calibration, ensuring the light propagates in the correct direction. The optical attenuator 203 is used to appropriately attenuate the intensity of the laser beam to suit the working range of the detector 204. The detector 204 receives the processed laser beam and converts the optical signal into an electrical signal for subsequent analysis and processing. During this process, the focus fine-tuning structure 205 can adjust the distance between the detector 204 and the receiving lens group 201 according to actual needs, thereby achieving fine-tuning of the focusing at the transmitting end of the detector 204 and ensuring measurement accuracy. The first illumination component 206 provides sufficient light to the first reference mark 202, making its crosshair clearer and facilitating calibration operations. For the transmitting lens module 3, the light emitted by the light source 301 propagates according to the simulated optical path emission direction. First, the light source 301 passes through the second reference mark 302. The optical axis angle is finely adjusted by the angle adjustment mechanism, and calibration is completed under the guidance of the second reference mark 302, ensuring accurate light emission direction. Then, the light passes through the focal length adjustment objective lens 303 and the emitting lens group 304. The distance between the focal length adjustment objective lens 303 and the emitting lens group 304 is adjustable. By changing this distance, the beam expansion ratio can be changed to simulate laser emission under different distances and environments. The second illumination component 305 provides illumination to the second reference mark 302, making its indication clearer. This design allows the simulation test method used to evaluate the ranging performance of laser rangefinders to accurately simulate different measurement scenarios, providing a comprehensive and accurate evaluation of the ranging performance of the laser rangefinder. By precisely adjusting and controlling parameters such as optical axis angle, focus, and beam expansion ratio, the performance of the laser rangefinder in actual use can be more realistically reflected, providing a reliable basis for the research, development, production, and quality inspection of laser rangefinders. Meanwhile, the fixing fixture 1 of the device matches the outer contour shape of the laser rangefinder under test, which can stably fix the device under test and reduce the impact of factors such as equipment shaking on the test results.

[0106] like Figures 7 to 8As shown, in specific implementation, the objective lenses in the receiving lens assembly 201 are respectively assembled in the first receiving lens barrel 207 via the first retaining ring 213, and the first reference mark is set at the tail end of the first receiving lens barrel 207. This assembly method makes the installation of the receiving lens assembly 201 more stable, ensuring that the light can be accurately focused and adjusted through the receiving lens assembly 201. At the same time, the use of the first retaining ring 213 also facilitates the replacement and maintenance of the objective lenses. When the objective lens is damaged or needs cleaning, the operator can easily remove the first retaining ring 213 and take out the objective lens for corresponding processing. The first reference mark set at the tail end of the first receiving lens barrel 207 provides an important reference for optical axis deflection calibration. In actual operation, the operator can clearly observe the relative positional relationship between the light and the crosshair reference line, thereby accurately judging whether the optical axis deflection meets the requirements and making corresponding adjustments. This design further improves the calibration accuracy of the entire testing equipment and ensures the reliability of the test results. Furthermore, the design of the first receiving lens barrel 207 facilitates the installation of subsequent components such as the focus fine-tuning structure 205 and the optical attenuator 203. It provides a stable mounting base for these components, enabling them to work closely together to process and analyze the laser beam. During subsequent use, the objective lenses of the receiving lens group 201 can be replaced or adjusted according to different testing needs. For example, for laser beams of different wavelengths, appropriate objective lenses can be selected to ensure the light focusing effect; for laser beams of different intensities, the intensity distribution of the light can be adjusted by changing the objective lenses. This flexibility allows the testing equipment to adapt to more testing scenarios, further improving its applicability and practicality. Meanwhile, to ensure the stability and durability of the first receiving lens barrel 207, high-strength, corrosion-resistant materials can be used in its manufacture. During the manufacturing process, dimensional accuracy and surface finish must be strictly controlled to ensure that the performance of the receiving lens group 201 is not affected. Similarly, the manufacturing of the first retaining ring 213 must ensure its precision and quality, enabling it to firmly fix the objective lens while facilitating disassembly and installation.

[0107] In this embodiment, the focus fine-tuning structure 205 includes a second receiving lens barrel 208 that is threadedly connected to the first receiving lens barrel 207. The detector 204 is mounted inside the second receiving lens barrel 208 via a mounting plate 209. By rotating the second receiving lens barrel 208, the distance between the receiving lens group 201 and the detector 204 can be adjusted. A set screw 210 for limiting the rotational position of the second receiving lens barrel is also provided between the second receiving lens barrel 208 and the first receiving lens barrel 207. This design makes the focus fine-tuning operation more precise and convenient. When a focus fine-tuning is required, the operator only needs to loosen the set screw 210 and then rotate the second receiving lens barrel. Since the second receiving lens barrel is threadedly connected to the first receiving lens barrel 207, the second receiving lens barrel will move along the axial direction of the first receiving lens barrel 207 during rotation, thereby changing the distance between the receiving lens group 201 and the detector 204. Adjusting this spacing allows the detector 204 to receive a clearer and more accurate laser signal, thereby improving the accuracy of the testing equipment's evaluation of the laser rangefinder's ranging performance. After adjusting the appropriate focal length, the operator can tighten the set screw 210 to fix the second receiving lens tube 208 in its current position, preventing displacement due to vibration or other factors during subsequent testing and ensuring the stability and reliability of the test results. Furthermore, this focal length fine-tuning structure 205, which uses a threaded connection and set screw 210, offers good durability and maintainability. The threaded connection ensures smooth movement of the second receiving lens tube 208 during rotation, reducing wear. Simultaneously, the use of the set screw 210 simplifies the structure, facilitating disassembly and installation. When equipment malfunctions or requires maintenance, the second receiving lens tube 208 can be quickly adjusted or replaced, reducing maintenance costs and time. In addition, this focal length fine-tuning structure 205 can be combined with the aforementioned operation of changing or adjusting the objective lens according to different testing needs. After changing the objective lens, the focus may need to be readjusted. The focus fine-tuning structure 205 can quickly and accurately complete this operation, further improving the adaptability and flexibility of the testing equipment in different testing scenarios.

[0108] Specifically, an optical attenuator 203 is disposed in the second receiving tube 208 between the first reference mark 202 and the detector 204. The optical attenuator 203 plays a crucial role in the entire testing equipment. It can accurately attenuate the intensity of the laser beam according to actual needs. When the intensity of the laser beam emitted by the laser rangefinder under test is too high, the optical attenuator 203 can reduce its intensity to a range that the detector 204 can stably receive and process, avoiding saturation or damage to the detector 204 due to excessive laser intensity, thereby ensuring that the detector 204 can accurately convert the optical signal into an electrical signal for subsequent analysis. Moreover, the installation method of the optical attenuator 203 is convenient for disassembly and replacement. When facing laser beams of different intensities or different types of testing needs, operators can easily replace the optical attenuator 203 with different attenuation coefficients to achieve the best testing results. At the same time, in order to ensure the performance stability of the optical attenuator 203, its material selection and manufacturing process are subject to strict requirements. Materials with good optical properties and chemical stability are typically selected, and high-precision processing and coating are performed during manufacturing to ensure that the optical attenuator 203 maintains stable attenuation performance over long-term use, unaffected by external environmental factors. Furthermore, the optical uniformity of the optical attenuator 203 is also crucial. Uniform optical performance ensures consistent intensity attenuation of the laser beam across the entire cross-section, avoiding the impact of localized attenuation differences on the accuracy of test results. During actual testing, operators can flexibly adjust the attenuation level of the optical attenuator 203 based on the signal strength fed back by the detector 204. For example, when the signal received by the detector 204 is too weak, the attenuation coefficient of the optical attenuator 203 can be appropriately reduced; conversely, when the signal is too strong, the attenuation coefficient can be increased. This real-time adjustment method further enhances the adaptability and flexibility of the testing equipment, ensuring accurate and reliable test results under various testing conditions.

[0109] Specifically, the first illumination assembly 206 includes a laterally arranged first LED light 211 and a first power cable 212. The first LED light 211 is installed through a first illumination hole pre-drilled in the wall of the second receiving lens barrel 208. Similarly, the second illumination assembly 305 includes a laterally arranged second LED light 314 and a second power cable 315. The second LED light 314 is installed through a second illumination hole pre-drilled in the second mounting base 306. The arrangement of the first illumination assembly 206 and the second illumination assembly 305 is crucial for the calibration operation of the entire testing equipment. The first LED light 211 is installed on the wall of the second receiving lens barrel 208 through the first illumination hole. Its lateral arrangement allows it to illuminate the first reference mark 202 at a suitable angle, enabling the operator to clearly see the relative position of the crosshair and the transmitter of the detector 204 when performing optical axis deflection calibration. The first power cable 212 provides a stable power supply to the first LED light 211, ensuring its normal illumination. Moreover, this side-mounted installation method facilitates the replacement and maintenance of the lighting fixtures. When the first LED lighting fixture 211 malfunctions, the operator can easily inspect or replace it through the first lighting hole. The second LED lighting fixture 314 is side-mounted through the second lighting hole reserved on the second mounting base 306, also providing sufficient illumination for the second reference mark 302. During the calibration process of the transmitting lens module 3, the light emitted by the light source 301 needs to be finely adjusted for optical axis deviation by cooperating with the second reference mark 302. A clear crosshair helps the operator more accurately determine whether the emission direction of the light source 301 meets the requirements, thereby completing the calibration operation. The second power cable 315 provides power support for the second LED lighting fixture 314, ensuring its continuous and stable operation. In order to ensure the stability and uniformity of the lighting effect, there are certain requirements for the selection of the first LED lighting fixture 211 and the second LED lighting fixture 314. Usually, LEDs with stable luminous intensity and suitable color temperature are selected to ensure that the first reference mark 202 and the second reference mark 302 can be evenly illuminated, avoiding shadows or uneven brightness. Meanwhile, the design of the first and second illumination holes is also ingenious, ensuring the installation of LED lights while preventing light leakage from interfering with other components. When installing the first LED light 211 and the second LED light 314, their installation position and angle must be strictly controlled to ensure accurate illumination of the first reference mark, improving calibration accuracy and efficiency. Furthermore, in actual use, the brightness of the first LED light 211 and the second LED light 314 can be adjusted according to different ambient light conditions. For example, in dimly lit environments, the brightness can be appropriately increased; in brightly lit environments, the brightness can be decreased to ensure that the operator can clearly observe the crosshair reference line.This adjustable lighting method further enhances the applicability of the testing equipment in different environments, ensuring accurate calibration and testing under various conditions. Simultaneously, to extend the lifespan of the LED lights, overcurrent and overvoltage protection devices can be installed in the lighting circuit to prevent damage to the LED lights due to abnormal current or voltage. Furthermore, regular inspection and maintenance of the LED lights and power cables allows for the timely detection and handling of potential faults, ensuring the normal operation of the lighting unit and providing strong support for the stable operation of the entire simulation testing method used to evaluate the ranging performance of laser rangefinders.

[0110] like Figures 9 to 11 As shown, in practical applications, both the light source 301 and the second crosshair dividing plate can be detachably mounted in the mounting holes 308 of the mounting base 306, and the optical axis of the light source 301 passes through the center of the crosshair reference line of the second crosshair dividing plate. This detachable assembly method has significant advantages. On the one hand, it facilitates the separate maintenance and replacement of the light source 301 and the second crosshair dividing plate. When the light source 301 exhibits abnormal light emission or the second crosshair dividing plate is damaged, it is not necessary to replace the entire mounting base 306; simply remove the corresponding component from the mounting hole 308 and replace it with a new component, greatly reducing maintenance costs and difficulty. On the other hand, under different testing requirements, different specifications of the light source 301 and the second crosshair dividing plate can be easily replaced. For example, for some high-precision ranging performance evaluation tests, it may be necessary to replace the light source 301 with one that has higher luminous intensity and better stability, as well as the second crosshair dividing plate with finer scale. Furthermore, since the optical axis of the light source 301 passes through the center of the crosshair reference line of the second crosshair dividing plate, it ensures that the light is accurately projected onto the target position, providing a precise light reference for evaluating the ranging performance of the laser rangefinder. During installation, strict assembly precision must be ensured to guarantee accurate alignment of the optical axis with the center of the crosshair reference line.

[0111] In specific implementation, the focus-adjusting objective lens 303 is installed within the internally threaded sleeve 309 via an externally threaded retainer, and its installation position can be controlled by rotating the externally threaded retainer. The transmitting lens assembly 304 is assembled and fixed using a second retaining ring 310. This installation method allows for highly flexible position adjustment of the focus-adjusting objective lens 303, enabling operators to precisely control its position within the equipment according to actual testing needs, thereby achieving precise adjustment of the light's focal length. By rotating the externally threaded retainer, the front-to-back position of the focus-adjusting objective lens 303 can be changed with fine precision to adapt to different requirements. The transmitting lens assembly 304 is assembled and fixed using the second retaining ring 310, ensuring the stability of the transmitting lens assembly 304 within the equipment. The second retaining ring 310 effectively prevents the transmitting lens assembly 304 from loosening or shifting during equipment operation, ensuring that the emitted light propagates stably and accurately. Furthermore, this installation method for the focus-adjusting objective lens 303 and the transmitting lens assembly 304 also facilitates equipment maintenance and upkeep. When the focus adjustment objective lens 303 malfunctions or needs to be replaced with a different lens, it can be easily removed by rotating the external threaded retainer. Similarly, for the transmitting lens assembly 304, if repair or replacement is required, the second retaining ring 310 can be loosened relatively easily. This design improves the maintainability of the equipment and reduces downtime caused by component damage or the need for adjustments.

[0112] In this embodiment, the probe emitting lens module 3 further includes a first emitting lens barrel 311 and a second emitting lens barrel 312, which are coaxially and detachably connected by mounting screws 317 to form a light guide channel. A mounting base 306 is provided at the first end of the first emitting lens barrel 311, and a focal length adjustment objective lens 303 and an emitting lens group 304 are respectively provided at the first and last ends of the second emitting lens barrel 312. This design makes the assembly and disassembly of the probe emitting lens module 3 more convenient. If the first emitting lens barrel 311 or the second emitting lens barrel 312 or any of the components assembled therein are damaged during use, they can be quickly replaced by unscrewing the mounting screws 317. Moreover, the coaxial and detachable connection ensures the stability and accuracy of the light guide channel, allowing light to propagate efficiently within the lens barrel along a preset path. The mounting base 306 provides a stable mounting foundation for the entire probe emitting lens module 3, allowing it to be firmly installed in the corresponding position on the testing equipment, preventing shaking or displacement during testing. The focus adjustment objective lens 303 and the transmitting lens group 304 are respectively located at the beginning and end of the second transmitting lens tube 312, enabling better focusing and emission of light. In actual laser rangefinder performance evaluation tests, adjusting the focus adjustment objective lens 303 can change the degree of light focusing, thereby simulating light propagation at different distances; the transmitting lens group 304 is responsible for stably and accurately emitting the focused light to achieve the purpose of testing the laser rangefinder performance. In particular, this layout makes it easier to individually debug and maintain the focus adjustment objective lens 303 and the transmitting lens group 304, further improving the practicality and reliability of the testing equipment.

[0113] Specifically, the optical axis deflection fine-tuning mechanism includes at least four fine-tuning screws 313 evenly distributed along the circumference of the first emitting lens barrel 311. Each fine-tuning screw 313 extends radially inward through a threaded hole in the wall of the first emitting lens barrel 311, and its end abuts against the mounting base 306 to achieve optical axis deflection compensation. By rotating the fine-tuning screw 313, it moves radially within the threaded hole, and the force exerted on the mounting base 306 by the end abutting against the mounting base 306 changes according to the direction and number of rotations. When optical axis deflection compensation is required, the operator can adjust the fine-tuning screw 313 at the corresponding position based on the actual measured optical axis deflection data. For example, if an optical axis deflection is detected in a certain direction, the fine-tuning screw 313 in that direction can be fine-tuned. By screwing in the fine-tuning screw 313, it applies greater pressure to the mounting base 306, pushing the mounting base 306 to produce a small displacement in the corresponding direction, thereby achieving optical axis deflection compensation. Furthermore, since the fine-tuning screws 313 are adjusted via threaded holes, this threaded connection method has excellent self-locking properties. Once adjusted to the appropriate position, it stably fixes the mounting base 306 in that position, preventing changes in the optical axis angle due to external vibrations or other factors during subsequent testing. In addition, this fine-tuning method offers high precision and flexibility. Operators can make small, precise adjustments as needed, gradually approaching the ideal optical axis angle to meet the testing requirements of different laser rangefinders. Simultaneously, due to the distribution and independent adjustment characteristics of the fine-tuning screws 313, even in cases with complex optical axis angles, effective compensation for the optical axis angle can be achieved by rationally combining and adjusting the fine-tuning screws 313 in different positions. This ensures that the testing equipment can accurately simulate light propagation under various actual conditions, improving the accuracy and reliability of laser rangefinder ranging performance evaluation tests.

[0114] Please see Figures 2 to 4In specific application scenarios, the receiving lens module 2 is fixed to a sliding stage 4 via a horizontal base plate 214. The sliding stage 4 is slidably connected via a guide limiting structure 5, and its sliding position is controlled by a push-pull handle 6, thereby correcting the relative relationship between the receiving lens module 2 and the simulated receiving mounting position 101. The transmitting lens module 3 is directly fixed to the simulated transmitting mounting position 102 via a vertical base plate 316. This installation method greatly facilitates the operation and adjustment of the entire testing equipment. The receiving lens module 2 is fixed to the sliding stage 4 via the horizontal base plate 214, allowing its position to be flexibly changed. The guide limiting structure 5 ensures the stability and accuracy of the sliding stage 4's movement, avoiding offset and shaking during the sliding process. The operator can easily control the sliding position of the sliding stage 4 via the push-pull handle 6, thereby accurately correcting the relative relationship between the receiving lens module 2 and the simulated receiving mounting position 101. The transmitting lens module 3 is directly fixed to the simulated transmitting mounting position 102 via a vertical base plate 316, ensuring the stability of the transmitting lens module 3. A stable transmitting position is crucial for accurately simulating the transmission of a laser rangefinder, reducing test errors caused by unstable transmitting positions. Furthermore, this layout of the receiving lens module 2 and the transmitting lens module 3 makes the overall structure of the test equipment more rational and compact. Within a limited space, the components can be arranged in an orderly manner, facilitating operation and improving testing efficiency. Moreover, this layout also promotes the integration and modular design of the equipment, making it easier to upgrade and expand in the future. During actual testing, the operator can first adjust the position and angle of the transmitting lens module 3 according to the specific parameters of the laser rangefinder under test and the test requirements, so that it accurately simulates the transmission state of the laser rangefinder. Then, the position of the receiving lens module 2 is adjusted using the push-pull handle 6 to ensure that its relative relationship with the simulated receiving mounting position 101 meets the test standards. During the adjustment process, the functions of the aforementioned focal length fine-tuning structure 205, light attenuator 203, illumination unit, and other components can be combined to further optimize the test conditions and improve the accuracy and reliability of the test results. Preferably, the guide limiting structure 5 includes a slide groove, and the sliding stage 4 is connected to the slide groove via locking bolts.

[0115] In summary, the design of this simulation testing device has many significant advantages:

[0116] In terms of focus control, the focal length is finely adjusted as needed using the focal length fine-tuning structure 205, thereby achieving precise matching of the focal lengths of the receiving lens group 201 and the detector 204. This enables accurate focusing in simulated measurement scenarios, significantly improving the accuracy of test results. This improvement solves the problem of fixed spacing between the receiving lens group 201 and the detector 204 in existing technologies, which prevents fine-tuning of the focal length, making the testing process more flexible and accurate.

[0117] To protect detector 204, the optical attenuator 203 effectively solves the problem of detector 204's vulnerability. When a high-intensity beam of light is incident on the receiving end of detector 204, the optical attenuator 203 can attenuate the beam, preventing detector 204 from being damaged by the high-intensity beam and improving the stability and reliability of the entire testing system.

[0118] In terms of beam control, the distance between the focal length adjustment objective lens 303 of the transmitting lens module 3 and the transmitting lens group 304 is adjustable, enabling changes in the beam expansion ratio. This means that in different ranging scenarios, the beam divergence angle parameter can be precisely adjusted according to actual needs, greatly improving the system's adaptability and testing accuracy. For example, in simulating a test scenario of close-range, high-reflectivity targets, the beam expansion ratio can be reduced to make the beam more focused, thereby obtaining more accurate test data; while in simulating a long-range, low-reflectivity target, the beam expansion ratio can be increased to allow the beam to cover a wider area, ensuring comprehensive testing.

[0119] Regarding the observation reference, both the receiving lens module 2 and the transmitting lens module 3 are equipped with illumination units. These illumination units provide illumination support for the first reference mark, ensuring good visual recognition of the crosshairs even in low-light environments or under complex lighting conditions, thereby improving the operator's alignment accuracy and work efficiency.

[0120] The design of the fixed fixture 1 ensures that the laser rangefinder under test can be accurately installed in the equipment. The simulated receiver mounting position 101 and the simulated transmitter mounting position 102 precisely correspond to the transmitter and receiver probes of the laser rangefinder under test, providing a stable and accurate foundation for the entire testing process. At the same time, the receiver lens module 2 can be flexibly adjusted in position according to the actual situation through the sliding stage 4 and the guide limiting structure 5, precisely matching the simulated receiver mounting position 101; the transmitter lens module 3 is firmly fixed on the simulated transmitter mounting position 102 through the vertical base plate 316, ensuring the stability of the transmission optical path.

[0121] Each component adopts a detachable design. For example, the objective lens of the receiving lens assembly 201 is assembled into the first receiving lens barrel 207 via the first retaining ring 213, the transmitting lens assembly 304 is assembled and fixed by the second retaining ring 310, and the first transmitting lens barrel 311 and the second transmitting lens barrel 312 are coaxially and detachably connected by mounting screws 317. This makes equipment maintenance and component replacement more convenient and efficient. In actual use, if a component malfunctions or requires performance upgrades, operators can quickly disassemble and replace the corresponding component, reducing equipment downtime and improving equipment utilization efficiency.

[0122] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A simulation test method for evaluating the ranging performance of a laser rangefinder, characterized in that, Includes the following steps: S1: Fix the laser rangefinder under test to a fixed fixture, which has a simulated receiving mounting position and a simulated transmitting mounting position, corresponding to the receiving probe and transmitting probe of the laser rangefinder under test, respectively; S2: The receiving optical path is calibrated using a calibration unit set at a relative position to the analog receiver mounting position. The calibration unit includes a first reference mark with a first illumination component and fine-tunes the focus of the receiver end. S3: The emission optical path is calibrated using a calibration unit set at a relative position to the simulated emission mounting position. The calibration unit includes a second reference mark with a second illumination component and sets the beam expansion ratio at the emission end. S4: Select the analog signal processing link based on the distance to the target to be simulated: If the target distance is ≤1km, activate the short-range analog link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; Amplify and power divide electrical signals; modulate the power-divided signals onto optical fiber signals; An adjustable fiber optic delay line is used to delay the optical signal, simulating the signal transmission distance; the delayed optical signal is then converted back into an electrical signal. The electrical signal is amplified; the amplified electrical signal is then modulated onto a simulated ranging optical signal. If the target distance is >1km, activate the long-distance analog link: receive the laser ranging signal emitted by the laser rangefinder under test and convert it into an electrical signal; perform high-speed ADC sampling on the electrical signal; use a high-speed FPGA to perform waveform fitting on the sampled signal; perform digital delay processing according to the delay time set by the digital timer; drive the high-speed DAC to output the delayed analog waveform; modulate the waveform output by the DAC onto the simulated ranging optical signal; S5: Adjust the optical attenuation of the simulated ranging optical signal generated in step S4 to control its output optical power and simulate the return signal energy at different distances. S6: Couple the power-adjustable noisy light to the simulated ranging light signal in step S5 to simulate environmental interference; S7: The simulated ranging optical signal, after attenuation and noise optical coupling, is transmitted through the simulated transmission mounting position of the fixed fixture and the transmission optical path; S8: The simulated ranging optical signal propagates through space and is received by the receiving probe of the laser rangefinder under test to complete the simulated ranging; S9: Record and analyze the ranging results of the laser rangefinder under test, and evaluate its performance.

2. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 1, characterized in that: In step S5, the adjustable light attenuation dynamically adjusts the attenuation amount based on the target distance and the simulated target reflectivity.

3. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 1 or 2, characterized in that: In step S6, the power of the noise light is adjustable to simulate ambient background light or interference of different intensities.

4. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 3, characterized in that: In step S4, when enabling the long-distance analog link, during waveform fitting and delay processing using a high-speed FPGA, at least one of the following operations is also performed: Simulated raindrop interference noise is superimposed on the fitted ranging signal waveform; A delay signal simulating multipath effect is superimposed on the fitted ranging signal waveform; The fitted ranging signal waveform is modulated to simulate atmospheric turbulence or attenuation effects.

5. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 1, characterized in that: In step S2, the fine-tuning of the receiving end focusing is achieved by adjusting the distance between the detector and the receiving lens group in the receiving optical path.

6. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 5, characterized in that: In the receiving lens assembly, the objective lenses are respectively assembled in the first receiving lens barrel via the first pressure ring, and the first reference mark is provided at the tail end of the first receiving lens barrel; the detector is assembled in the second receiving lens barrel by means of a mounting plate, and the second receiving lens barrel is threadedly connected to the first receiving lens barrel; by rotating the second receiving lens barrel, the distance between the receiving lens assembly and the detector can be adjusted; a set screw for limiting the rotational position of the second receiving lens barrel is also provided between the second receiving lens barrel and the first receiving lens barrel.

7. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 5 or 6, characterized in that: In step S3, the setting of the beam expansion ratio of the transmitting end is achieved by adjusting the distance between the focal length adjustment objective and the transmitting lens group in the transmitting optical path.

8. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 7, characterized in that: The focal length adjustment objective lens is installed in the internal threaded sleeve via an external threaded retainer, and its installation position can be controlled by rotating the external threaded retainer. The internal threaded sleeve is fixed in the second emitting lens barrel. The emitting lens assembly is assembled and fixed in the second emitting lens barrel by means of a second pressure ring.

9. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 8, characterized in that: At the entrance of the second lens tube, the first lens tube is coaxially and detachably connected by screws; at the entrance of the first lens tube, a light source and a second reference mark are sequentially assembled according to the simulated light path emission direction via a mounting base.

10. The simulation test method for evaluating the ranging performance of a laser rangefinder according to claim 1, 8, or 9, characterized in that: In steps S2 and S3, both the first and second reference marks use cross-shaped reticles that facilitate optical axis calibration.

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