High-speed on-orbit simulation speed measurement system

Abstract

The present invention relates to the field of simulated speed measurement technology and discloses a high-speed on-track simulated speed measurement system, including a speed measurement mechanism, which includes a bracket. The high-speed on-track simulated speed measurement system uses a motor-driven chopper turntable to proportionally reproduce maglev track parameters, supports dynamic loading of straight / curved / ramp templates, and combines a split-type shading disk modular design to achieve rapid switching between multiple scenarios. It uses a time-space dual-domain analytical algorithm, combined with dynamic temperature vibration compensation (correction rate ≥ 95%) and an adaptive sliding average window, to achieve a speed solution resolution of 0.001 m / s and a fluctuation rate of <0.05%. It simulates train acceleration / braking through millisecond-level PID control of the motor response, integrates white noise vibration simulation and focusing lens spot adjustment functions, and simultaneously generates a "speed-vibration-light attenuation" multi-physics field coupling test report, providing high-precision data support for track control system optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation speed measurement, and in particular to a high-speed on-orbit simulation speed measurement system. Background Art

[0002] High-speed on-track speed measurement is a core technology of rail transit. It is like a "smart speedometer" for trains. By combining a variety of high-tech means, it can accurately measure the running speed of high-speed trains (such as high-speed rail, maglev) or subways in real time. The key to this technology is to ensure that the train can still run safely and efficiently at extreme speeds (such as speeds exceeding 300 kilometers per hour). Common speed measurement methods include: axle sensors that calculate the number of wheel rotations (similar to bicycle meters, but errors may occur due to slippage or wear at high speeds), Doppler radars that measure speed by changes in microwave reflection frequency (similar to police car speedometers, but affected by ground materials), and global positioning systems that rely on satellite signals (such as GPS or Beidou, but may fail in tunnels or cities), and inertial navigation systems that calculate speed through acceleration and gyroscopes (similar to the gyroscope in a mobile phone, but errors accumulate over time). Due to the limitations of a single method, high-speed scenarios usually require the integration of multiple sensor data. For example, high-speed rail may use axle sensors, radar, and satellite positioning simultaneously, and then make comprehensive judgments through intelligent algorithms to form a redundant design to improve reliability. In addition, track transponders (ground electronic tags) or digital maps can also assist in error correction. In the future, with the development of new technologies such as quantum sensing and artificial intelligence prediction, speed measurement systems will be more accurate and intelligent, further ensuring the safety and efficiency of rail transit.

[0003] However, in the existing high-speed on-orbit speed measurement, the existing high-speed on-orbit speed measurement technology relies on high-precision sensors such as laser interferometers, high-speed cameras and special calibration equipment, resulting in high hardware procurement and maintenance costs. Therefore, there is an urgent need for a high-speed on-orbit simulation speed measurement system. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-speed on-orbit simulation speed measurement system to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-speed on-orbit simulation speed measurement system, comprising a speed measurement mechanism, wherein the speed measurement mechanism comprises a bracket;

[0006] The inner wall of the bracket is fixedly connected to a slide rail, the surface of the slide rail is slidably connected to a slider 1, the top of the slider 1 is fixedly connected to a support frame, the inner wall of the support frame is fixedly connected to a fiber laser, the output end of the fiber laser is fixedly connected to a collimating lens, the end of the fiber laser away from the collimating lens is fixedly connected to a transmitting end fiber jumper, the end of the transmitting end fiber jumper away from the fiber laser is fixedly connected to a laser tube drive assembly, the inner wall of the bracket is fixedly connected to a rotating rod, the surface of the rotating rod is rotatably connected to a rotating frame, the inner wall of the rotating frame is fixedly connected to a mounting frame, and the mounting frame A motor is fixedly connected to the surface of the mounting frame, and the output end of the motor is fixedly connected to the chopper turntable. The surface of the slide rail is also slidably connected to a slider 2, and the surface of the slider 2 is fixedly connected to a focusing lens. The surface of the slider 2 is also fixedly connected to a filter. An APD receiver is provided at the bottom end of the filter. A connecting line is fixedly connected to the surface of the APD receiver, and an end of the connecting line away from the APD receiver is fixedly connected to a signal source. A receiving end optical fiber jumper is also fixedly connected to the surface of the APD receiver, and an oscilloscope is fixedly connected to the end of the receiving end optical fiber jumper away from the APD receiver.

[0007] The chopper turntable is coaxially connected to the motor through a rotating rod. A shading pattern is provided on the surface of the chopper turntable. The signal source inputs a modulation signal to the motor to drive the turntable to simulate dynamic shading under different acceleration curves. The spacing Δs of the shading pattern and the speed range satisfy the relationship: Δs = v max / (2f s ), where v max is the maximum simulation speed, f s is the signal sampling rate.

[0008] The filter 1015 is a 650±5 nm narrowband filter for suppressing ambient light interference. The output end of the APD receiver 1016 is connected to a 1 kHz~10 MHz bandpass filter for eliminating power frequency noise and high-frequency glitches.

[0009] The oscilloscope compares the measured speed with the preset curve of the signal source to generate a PID error signal. The motor dynamically adjusts the speed according to the PID output to form a closed-loop control with an accuracy of ±0.01%.

[0010] The signal source integrates a white noise generation module that can inject random interference with a bandwidth of 0-10 MHz into the APD receiver. The oscilloscope has a built-in error analysis algorithm that compares the deviation between the measured signal and the chopper disk reference signal in a noisy environment.

[0011] An optical isolator is inserted between the fiber laser and the laser tube drive assembly to suppress echo reflection. The connecting line is connected to an oscilloscope via a BNC interface to support real-time signal analysis.

[0012] The surface of the laser tube driving assembly is fixedly connected to the bracket, and the top end of the APD receiver is fixedly connected to the second slider.

[0013] The slide rail adopts a high-precision linear guide structure with a titanium nitride wear-resistant coating on the surface. The bottom of the slider 1 and the slider 2 are provided with a self-lubricating gasket made of graphene composite material to ensure that the axial movement accuracy is better than ±5 μm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] First, the present invention uses a motor to drive a large disc chopper turntable, and arranges the geometric parameters of the actual maglev track, such as switch spacing and slope, in proportion to its surface. The topological arrangement can reproduce the actual track layout with an error of ≤0.1 mm / m, and supports dynamic loading of different track templates, such as straight segments, curves, and ramps, without the need for physical track reconstruction, significantly reducing testing costs. At the same time, the disc adopts a split design, and modular splicing of shading patterns enables rapid scene replacement, with a replacement time of less than 5 minutes, taking into account both high-precision simulation and flexible adaptability of multi-condition testing.

[0016] Second, in the time domain, the present invention uses a TDC time-to-digital converter to measure the interval Δt between adjacent pulses with an accuracy of 10 ns. In the spatial domain, combined with the proportional parameter of the grating aperture Δs, the velocity resolution is calculated based on the formula v=Δs / Δt to reach 0.001 m / s. A dynamic error compensation algorithm is introduced to use temperature sensor and vibration accelerometer data to correct the drift compensation rate of Δs and Δt in real time, achieving a rate of ≥95%. At the same time, a sliding average window of 20-40 μs is used to adaptively adjust the single measurement jitter, reducing the velocity fluctuation rate to <0.05%, significantly improving the anti-interference capability under complex working conditions.

[0017] Third, the present invention uses a PID algorithm to control the motor to achieve millisecond-level speed response, accurately simulating acceleration of maglev trains from 0 to 600 km / h and emergency braking, with an acceleration curve fitting error of ≤0.5%. It also supports injecting white noise to simulate track vibration, and uses slider 2 to adjust the focal length of the focusing lens to reproduce the laser scattering effect in complex weather conditions such as rain and fog. On this basis, it simultaneously simulates the "speed-vibration-spot attenuation" multi-physics field coupling effect, generating a comprehensive test report that includes dynamic response and anti-interference performance, providing high-confidence data support for parameter optimization of actual track control systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Legend:

[0020] 1. Speed ​​measuring mechanism; 10. Bracket; 1001. Slide rail; 1002. Laser tube drive assembly; 1003. Transmitter fiber jumper; 1004. Slider 1; 1005. Support frame; 1006. Fiber laser; 1007. Collimating lens; 1008. Rotating rod; 1009. Rotating frame; 1010. Chopper turntable; 1011. Mounting frame; 1012. Motor; 1013. Slider 2; 1014. Focusing lens; 1015. Filter; 1016. APD receiver; 1017. Connecting wire; 1018. Receiver fiber jumper; 1019. Oscilloscope; 1020. Signal source. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example:

[0023] like Figure 1 As shown, the present invention provides a technical solution: a high-speed on-orbit simulation speed measurement system, comprising a speed measurement mechanism 1, the speed measurement mechanism 1 comprising a bracket 10;

[0024] The inner wall of the bracket 10 is fixedly connected to a slide rail 1001, and a slider 1004 is slidably connected to the surface of the slide rail 1001. The top of the slider 1004 is fixedly connected to a support frame 1005. The inner wall of the support frame 1005 is fixedly connected to a fiber laser 1006. The output end of the fiber laser 1006 is fixedly connected to a collimating lens 1007. The end of the fiber laser 1006 away from the collimating lens 1007 is fixedly connected to a transmitting end fiber jumper 1003. The end of the transmitting end fiber jumper 1003 away from the fiber laser 1006 is fixedly connected to a laser tube driving assembly 1002. The inner wall of the bracket 10 is fixedly connected to a rotating rod 1008. The surface of the rotating rod 1008 is rotatably connected to a rotating frame 1009. The inner wall of the rotating frame 1009 is fixedly connected to a mounting frame 1011. The mounting frame 10 The surface of 11 is fixedly connected to a motor 1012, the output end of the motor 1012 is fixedly connected to a chopper turntable 1010, the surface of the slide rail 1001 is also slidably connected to a slider 2 1013, the surface of the slider 2 1013 is fixedly connected to a focusing lens 1014, the surface of the slider 2 1013 is also fixedly connected to a filter 1015, the bottom end of the filter 1015 is provided with an APD receiver 1016, the surface of the APD receiver 1016 is fixedly connected to a connecting line 1017, the end of the connecting line 1017 away from the APD receiver 1016 is fixedly connected to a signal source 1020, the surface of the APD receiver 1016 is also fixedly connected to a receiving end optical fiber jumper 1018, and the end of the receiving end optical fiber jumper 1018 away from the APD receiver 1016 is fixedly connected to an oscilloscope 1019.

[0025] The high-speed on-orbit simulation speed measurement system realizes high-precision dynamic speed measurement function by integrating the slide rail 1001, the rotating rod 1008 and multiple components of the bracket 10. The slider 1004 and the slider 2 1013 move along the slide rail to adjust the position of the collimating lens 1007 transmitting end and the focusing lens 1014 receiving end of the fiber laser 1006 respectively, ensuring that the laser beam accurately passes through the shading pattern of the chopper turntable 1010; the motor 1012 drives the turntable to simulate the orbital motion, and the laser signal passes through the filter 101 After noise reduction, the signal is converted into an electrical pulse by the APD receiver 1016 and transmitted to the oscilloscope 1019 through the connecting line 1017 and the receiving end optical fiber jumper 1018 to calculate the speed. At the same time, the signal source 1020 is linked with the PID algorithm to adjust the motor speed through real-time feedback, forming a full-process measurement and control of "motion simulation → signal acquisition → closed-loop correction". Ultimately, it realizes fast optical path calibration, anti-interference signal acquisition, and high-precision dynamic speed measurement with an error of ≤0.01%, meeting the simulation and verification requirements of high-speed scenarios such as maglev tracks.

[0026] The chopper turntable 1010 is coaxially connected to the motor 1012 via the rotating rod 1008. A shading pattern is provided on the surface of the chopper turntable 1010. The signal source 1020 inputs a modulation signal to the motor 1012 to drive the turntable to simulate dynamic shading under different acceleration curves. The spacing Δs of the shading pattern and the speed range satisfy the relationship: Δs = v max / (2f s , where v max is the maximum simulation speed, f s is the signal sampling rate.

[0027] The chopper turntable 1010 is coaxially connected to the motor 1012 via the rotating rod 1008. A programmable shading pattern is set on the surface. The signal source 1020 inputs a modulation signal to the motor to drive the turntable to dynamically simulate the shading effect under different acceleration curves, such as the acceleration / braking scene of a maglev train. The shading pattern spacing Δs and the rotation speed satisfy the relationship Δs = v max / (2f s , where v max is the maximum simulation speed, f s For the signal sampling rate, by adjusting Δs to match the motor speed, the optical pulse frequency and the sampling rate are ensured to be adapted, which not only avoids signal aliasing but also achieves a speed solution accuracy error of ≤0.01% at a maximum speed of 9000 rpm, meeting the requirements of wide-range and high-dynamic simulation.

[0028] The filter 1015 is a 650±5 nm narrowband filter 1015 for suppressing ambient light interference. The output end of the APD receiver 1016 is connected to a bandpass filter of 1 kHz to 10 MHz for eliminating power frequency noise and high-frequency glitches.

[0029] Filter 1015 uses a 650±5 nm narrowband filter, which suppresses background light interference by selectively transmitting a laser wavelength of 650 nm and filtering out ambient stray light such as sunlight and illumination. At the same time, the output of the APD receiver 1016 is connected to a 1 kHz to 10 MHz bandpass filter to eliminate 50 Hz power frequency noise and high-frequency switching power supply glitches, achieving two-stage purification of the electrical signal in the optical domain and time domain, thereby increasing the effective signal-to-noise ratio (SNR) by ≥20 dB, ensuring data accuracy error ≤0.02% and system anti-interference capability in high-speed speed measurement scenarios.

[0030] The oscilloscope 1019 compares the measured speed with the preset curve of the signal source 1020 to generate a PID error signal. The motor 1012 dynamically adjusts the speed according to the PID output to form a closed-loop control with an accuracy of ±0.01%.

[0031] The oscilloscope 1019 compares the measured speed with the preset curve of the signal source 1020 in real time, generates a PID error signal, and dynamically adjusts the speed of the motor 1012 through the proportional-integral-differential Kp=2.5, Ki=0.8, Kd=0.3 algorithm to form a closed-loop control loop, achieving a millisecond-level response adjustment period of ≤1 ms and an ultra-high tracking accuracy of ±0.01%; this closed-loop system suppresses overshoot through an anti-integral saturation design and supports a quadratic fitting error of ≤0.5% for the acceleration curve, ensuring the simulation authenticity of dynamic scenarios such as acceleration / braking of the maglev train. At the same time, the robustness deviation alarm threshold of 0.3% is verified through white noise injection to meet the needs of high-speed and high-precision measurement and control.

[0032] The signal source 1020 integrates a white noise generation module, which can inject random interference with a bandwidth of 0-10 MHz into the APD receiver 1016. The oscilloscope 1019 has a built-in error analysis algorithm to compare the deviation between the measured signal in a noisy environment and the reference signal of the chopper disk 1010.

[0033] The signal source 1020 integrates a white noise generation module, which injects random interference with a bandwidth of 0-10 MHz into the APD receiver 1016 to simulate noise interference in a strong electromagnetic environment. The oscilloscope 1019 has a built-in error analysis algorithm, which compares the deviation between the measured signal in a noisy environment and the reference signal of the chopper turntable 1010 in real time. When the deviation exceeds 0.3%, an alarm is triggered and the redundant signal channel receiving end fiber jumper 1018 is automatically switched, and an interference suppression rate report is generated at the same time. Through active interference injection and dynamic fault tolerance mechanism, this design verifies the system's robustness under complex working conditions with a false alarm rate of less than 0.1%, thereby improving the reliability and test efficiency of the high-speed speed measurement system.

[0034] An optical isolator is inserted between the fiber laser 1006 and the laser tube driving assembly 1002 to suppress echo reflection. The connecting line 1017 is connected to the oscilloscope 1019 through the BNC interface to support real-time signal analysis.

[0035] An optical isolator is inserted between the fiber laser 1006 and the laser tube driver assembly 1002 to effectively suppress the return reflection loss ≥40 dB, prevent reverse light from damaging the laser, and improve output stability; at the same time, the connecting line 1017 is connected to the oscilloscope 1019 through the BNC interface. Utilizing its high-frequency characteristics, bandwidth ≥100 MHz and anti-interference capabilities, it supports real-time signal waveform analysis with a sampling rate of 1 GSa / s, ensuring lossless transmission and accurate solution of high-speed pulse signals. The overall system signal-to-noise ratio (SNR) is improved by ≥15 dB, meeting the reliability requirements of millisecond-level dynamic speed measurement.

[0036] The surface of the laser tube driving assembly 1002 is fixedly connected to the bracket 10 , and the top of the APD receiver 1016 is fixedly connected to the second slider 1013 .

[0037] The surface of the laser tube driving assembly 1002 is rigidly fixed to the bracket 10 to ensure the mechanical stability of the laser emission end and avoid optical path deviation caused by vibration; at the same time, the top of the APD receiver 1016 is fixedly connected to the second slider 1013, and the axial position of the receiving end focusing lens 1014 and the filter 1015 is adjusted by sliding the slider along the slide rail 1001 to achieve dynamic coaxial calibration of the receiving optical path and the transmitting optical path with a calibration accuracy of ±0.05 mm. The two work together to ensure high stability and repeatability of optical signal reception and transmission, and reduce the speed measurement deviation caused by mechanical deformation or assembly error to ≤0.02%.

[0038] The slide rail 1001 adopts a high-precision linear guide structure with a titanium nitride wear-resistant coating on the surface. The bottom of the slider 1004 and the slider 2 1013 are provided with self-lubricating gaskets made of graphene composite materials to ensure that the axial movement accuracy is better than ±5 μm.

[0039] The wear resistance and smoothness of the slide rail 1001 system are significantly improved through the combination of a high-precision linear guide structure and a surface-strengthening titanium nitride coating. The titanium nitride coating can reduce the friction coefficient of the guide rail surface to below 0.15, effectively suppressing the degradation of precision caused by wear during long-term, high-frequency reciprocating motion. At the same time, the bottoms of sliders 1004 and 1013 are made of self-lubricating graphene-based composite materials, which utilize their interlayer shear properties to achieve stable sliding in an oil-free lubrication state. The two-dimensional honeycomb lattice structure of graphene increases the frictional thermal conductivity of the contact surface to 5300 W / m·K. Combined with the precision grinding process of the slider's V-shaped guide surface, this ensures that the axial movement accuracy is stable within the range of ±5 μm, thereby meeting the micron-level positioning requirements for optical path alignment and signal acquisition in the dynamic testing of maglev tracks.

[0040] Working principle: The chopper turntable 1010 is driven by the motor 1012 to rotate at high speed. The surface of the chopper turntable is etched with a light shielding pattern in proportion to the geometric parameters of the maglev track, such as the switch spacing and slope, to meet the requirement of Δs=v. max / (2f s ), v max is the maximum simulation speed, f sThe sampling rate of the signal source 1020 is set by dynamically modulating the parallel laser beam emitted by the fiber laser 1006 and formed by the collimating lens 1007 to simulate the track blocking effect during train operation. The transmitted light is focused by the condenser lens 1014, filtered out ambient stray light by the 650±5 nm narrowband filter 1015, and converted into an electrical pulse signal by the APD receiver 1016. The signal is then passed through a 1 kHz to 10 MHz bandpass filter to eliminate power frequency noise and high-frequency glitches, and then transmitted to the oscilloscope 1019 for "time-space dual-domain analysis" - the time domain uses the TDC with an accuracy of 10 ns to measure the adjacent pulse interval Δt, and the space domain combines Δs to solve the velocity resolution of 0.001 m / s based on the formula v=Δs / Δt. At the same time, the temperature sensor and vibration accelerometer data are integrated to compensate Δs in real time. The drift compensation rate with Δt is ≥95%; the solution result is compared with the preset curve of signal source 1020 to generate PID error signals Kp=2.5, Ki=0.8, and Kd=0.3. The motor speed is dynamically adjusted to form a closed-loop control accuracy of ±0.01% and a response time of ≤1 ms. The optical path coaxiality accuracy is calibrated to ±0.05 mm by moving sliders 1004 and 1013 along the slide rail 1001. Combined with the optical isolator suppressing echo reflection loss ≥40 dB, the BNC interface ensuring lossless signal transmission bandwidth ≥100 MHz, and the self-verification process of white noise injection 0-10MHz bandwidth and redundant channel switching deviation >0.3%, the backup receiving end fiber jumper 1018 is activated. This achieves high-precision dynamic speed measurement with an error of ≤0.02% and a highly robust false alarm rate of <0.1% under the coupling of optical-mechanical-electrical multi-physics fields, providing full-condition simulation verification capabilities for high-speed scenarios such as maglev tracks.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed on-orbit simulation speed measurement system, comprising a speed measurement mechanism (1), characterized in that: The speed measuring mechanism (1) comprises a bracket (10); a slide rail (1001) is fixedly connected to the inner wall of the bracket (10); a slider (1004) is slidably connected to the surface of the slide rail (1001); a support frame (1005) is fixedly connected to the top of the slider (1004); a fiber laser (1006) is fixedly connected to the inner wall of the support frame (1005); a collimating lens (1007) is fixedly connected to the output end of the fiber laser (1006); and the fiber laser (1006) is away from the collimating lens ( One end of the bracket (1007) is fixedly connected to a transmitting end optical fiber jumper (1003), and one end of the transmitting end optical fiber jumper (1003) away from the optical fiber laser (1006) is fixedly connected to a laser tube drive assembly (1002). The inner wall of the bracket (10) is fixedly connected to a rotating rod (1008), and the surface of the rotating rod (1008) is rotatably connected to a rotating frame (1009). The inner wall of the rotating frame (1009) is fixedly connected to a mounting frame (1011). The surface of (1011) is fixedly connected to a motor (1012), the output end of the motor (1012) is fixedly connected to a chopper turntable (1010), the surface of the slide rail (1001) is also slidably connected to a slider 2 (1013), the surface of the slider 2 (1013) is fixedly connected to a focusing lens (1014), the surface of the slider 2 (1013) is also fixedly connected to a filter (1015), and the bottom end of the filter (1015) is provided with an APD receiver (1016), a connecting wire (1017) is fixedly connected to the surface of the APD receiver (1016), and an end of the connecting wire (1017) away from the APD receiver (1016) is fixedly connected to a signal source (1020), and a receiving end optical fiber jumper (1018) is also fixedly connected to the surface of the APD receiver (1016), and an end of the receiving end optical fiber jumper (1018) away from the APD receiver (1016) is fixedly connected to an oscilloscope (1019).

2. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The chopper turntable (1010) is coaxially connected to the motor (1012) via a rotating rod (1008). A light-shielding pattern is provided on the surface of the chopper turntable (1010). The signal source (1020) inputs a modulation signal to the motor (1012) to drive the turntable to simulate dynamic shading under different acceleration curves. The spacing Δs of the light-shielding pattern and the speed range satisfy the relationship: Δs = v max / (2f s ), where v max is the maximum simulation speed, f s is the signal sampling rate.

3. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The filter (1015) is a 650±5 nm narrowband filter (1015) for suppressing ambient light interference. The output end of the APD receiver (1016) is connected to a bandpass filter with a bandpass range of 1 kHz to 10 MHz for eliminating power frequency noise and high-frequency burrs.

4. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The oscilloscope (1019) compares the measured speed with a preset curve of the signal source (1020) to generate a PID error signal. The motor (1012) dynamically adjusts the speed according to the PID output to form a closed-loop control with an accuracy of ±0.01%.

5. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The signal source (1020) is integrated with a white noise generation module, which can inject random interference with a bandwidth of 0-10 MHz into the APD receiver (1016). The oscilloscope (1019) has a built-in error analysis algorithm to compare the deviation between the measured signal in a noise environment and the reference signal of the chopper disk (1010).

6. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: An optical isolator is inserted between the fiber laser (1006) and the laser tube drive assembly (1002) to suppress echo reflection, and the connecting line (1017) is connected to an oscilloscope (1019) via a BNC interface to support real-time signal analysis.

7. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The surface of the laser tube driving assembly (1002) is fixedly connected to the bracket (10), and the top end of the APD receiver (1016) is fixedly connected to the second slider (1013).

8. The high-speed on-orbit simulation speed measurement system according to claim 1, characterized in that: The slide rail (1001) adopts a high-precision linear guide structure, and the surface is coated with a titanium nitride wear-resistant coating. The bottom of the slider 1 (1004) and the slider 2 (1013) are provided with a self-lubricating gasket made of graphene composite material to ensure that the axial movement accuracy is better than ±5 μm.

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