Radar test system adjustment method

Abstract

The present invention discloses a radar test system adjustment method, comprising: placing a first laser line marker on a horizontal turntable, the first laser line marker emitting a first laser beam to a flat plate in front of an angular reflector to generate a first cross-shaped cursor, a second laser line marker near the turntable emitting a second laser beam to the flat plate to generate a second cross-shaped cursor; adjusting the first laser line marker so that the horizontal lines of the two cross-shaped cursors are parallel to each other; adjusting the pitch axis angle of the turntable so that the horizontal lines of the two cross-shaped cursors coincide, and adjusting the turntable or the angular reflector so that the first laser line marker and the angular reflector are aligned with each other. The technical solution provided by the present invention can solve the technical problem in the prior art that it is difficult for the angular reflector to align with the radar antenna when building a radar darkroom test environment. The present invention does not require the installation of a reflective device on the antenna surface and the angular reflector surface, and can solve the problem of large measurement errors caused by uneven force applied to the reflective mirror surface.

Description

Technical Field

[0001] The present invention relates to the field of radar technology, and in particular to a radar test system adjustment method. Background Art

[0002] After mass production of radars, a radar test environment must be established to test the detection accuracy of the transmitting and receiving antennas and obtain radar calibration coefficients. Typically, this is done in a darkroom using near-field testing, or directly outdoors using far-field testing. Because outdoor testing is easily affected by factors such as weather, a darkroom is typically constructed during mass production to improve production efficiency, and near-field testing is performed on the radars.

[0003] A radar test chamber prevents interference from external electromagnetic waves, ensuring that measurements are unaffected by the external electromagnetic environment. On the one hand, conducting tests in a darkroom ensures confidentiality and avoids external electromagnetic interference, ensuring stable and reliable operation. On the other hand, performing tests in the darkroom's indoor testing environment allows for 24 / 7 operation, unaffected by environmental factors.

[0004] In the radar darkroom test environment, a corner reflector is often used as a test target. Therefore, it is necessary to install a corner reflector in the darkroom to reflect the signal waves emitted by the radar and generate a strong echo signal. During the construction of the test environment, it is necessary to ensure that the corner reflector is facing the product antenna surface and there is no inclination between the two. In the existing technology, the conventional debugging method is to install a reflecting device on the antenna surface or the corner reflector, such as closely attaching a reflector to a side so that the incident laser light and the reflected light overlap, to ensure that the corner reflector is facing the product antenna. However, due to the flatness of the product antenna and the uneven force of the mirror surface, during the debugging process, the position error between the corner reflector and the antenna is often large, and the two cannot be completely facing each other, resulting in a technical problem of large measurement errors. Summary of the Invention

[0005] The present invention provides a radar test system adjustment method, which aims to effectively solve the technical problem in the prior art that it is difficult to align the corner reflector with the radar antenna when building a radar darkroom test environment. The present invention does not require the installation of a reflection device on the antenna surface and the corner reflector surface, and can solve the problem of large measurement errors caused by uneven force on the reflective mirror surface.

[0006] According to one aspect of the present invention, the present invention provides a radar test system adjustment method, the method comprising:

[0007] Adjusting the turntable in the darkroom so that the table surface of the turntable is parallel to the horizontal plane;

[0008] A first laser marking instrument is placed on the turntable, and is driven to emit a first laser beam toward a flat plate preset at a preset installation position of the diagonal mirror to generate a first cross-shaped cursor on the flat plate; and a second laser marking instrument is placed near the turntable at a preset height, and is driven to emit a second laser beam toward the flat plate to generate a second cross-shaped cursor on the flat plate;

[0009] adjusting the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other;

[0010] adjusting the pitch axis angle of the turntable so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor coincide with each other;

[0011] Remove the flat plate and place the angle reflector at the preset installation position, and adjust the turntable based on the center position of the reflective surface of the angle reflector so that the center position of the cross cursor corresponding to the first laser line marker is aligned with the center position of the reflective surface of the angle reflector, or adjust the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser line marker so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser line marker.

[0012] Furthermore, the adjusting the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other includes:

[0013] The roll axis angle of the first laser marking device is adjusted until the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other.

[0014] Furthermore, the method further comprises:

[0015] Before adjusting the pitch axis angle of the turntable, the first laser marking device is fixed on the turntable.

[0016] Furthermore, the method further comprises:

[0017] After adjusting the pitch axis angle of the turntable so that the horizontal line of the first cross cursor and the horizontal line of the second cross cursor coincide with each other, it is determined that the current pitch axis angle of the turntable is a pitch angle of zero degrees.

[0018] Further, adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marking instrument so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser marking instrument includes:

[0019] The angle of the reflecting surface is adjusted by a plumb line so that the reflecting surface is perpendicular to the ground, and the spatial placement position of the angle reflector is adjusted so that the center position of the reflecting surface is aligned with the center position of the cross cursor corresponding to the first laser marking instrument.

[0020] Furthermore, the method further comprises:

[0021] After adjusting the turntable based on the center position of the reflecting surface of the angle reflector or adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marker, the zero-degree pitch angle of the turntable is adjusted based on the first laser marker and the angle reflector.

[0022] Furthermore, the adjusting the zero-degree pitch angle of the turntable based on the first laser marking instrument and the angle counter comprises:

[0023] Adjust the pitch axis angle of the turntable from the zero-degree pitch angle to the preset pitch angle, then restore the pitch axis angle of the turntable from the preset pitch angle to the zero-degree pitch angle, adjust the azimuth axis angle and the pitch axis angle of the turntable so that the center position of the cross cursor corresponding to the first laser marker is aligned with the center position of the reflective surface of the angle reflector, and update the zero-degree pitch angle according to the current pitch axis angle of the turntable.

[0024] Furthermore, the second laser marking device having a preset height is placed near the turntable and includes:

[0025] The height of the first laser marking instrument is obtained, and the height of the second laser marking instrument is determined based on the height of the first laser marking instrument, wherein a height difference between the first laser marking instrument and the second laser marking instrument is less than a preset threshold.

[0026] Furthermore, the first laser marking device is installed on the center of the pitch axis of the turntable.

[0027] Furthermore, the second laser marking instrument is a laser level.

[0028] Through one or more of the above embodiments of the present invention, at least the following technical effects can be achieved:

[0029] In the technical solution disclosed in this invention, two laser line markers are used to adjust the position and angle of the turntable and the reflector, ensuring that the reflector is aligned with the antenna surface, with no inclination between them. During debugging, this solution eliminates manual errors introduced by uneven force applied during reflector attachment. It also eliminates reliance on a reflector, thus avoiding measurement errors caused by reflector installation deviations. By optimizing the positional relationship between the antenna and reflector, the radar's measurement angle is improved, enhancing debugging accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0031] Figure 1 A flowchart of a radar test system adjustment method provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of a radar darkroom provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "and / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " herein, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0035] In radar systems, target detection relies on the time difference between the transmitted and received pulses and the speed of electromagnetic wave propagation (the speed of light) to accurately determine the distance between the radar and the target. The target's angular position is measured by the antenna's directivity. When the antenna beam is aligned with the target, the echo signal is strongest. The direction of the target can be determined based on the antenna beam's orientation when the received echo is strongest. Velocity is measured based on the frequency Doppler effect generated by the relative motion between the radar and the target. The frequency of the target echo received by the radar differs from the radar's transmission frequency, and the difference between the two is called the Doppler frequency. One of the key information that can be extracted from the Doppler frequency is the rate of change of the distance between the radar and the target, which in turn derives the target's velocity. This allows the determination of the target's velocity, direction, and distance.

[0036] Before using millimeter-wave radar, the array antenna must be calibrated. Establishing a far-field test environment requires extremely long distances, making direct testing in a fully anechoic chamber unsuitable. Furthermore, outdoor test sites are difficult to find, and their use is often hampered by weather conditions. Due to the time and cost constraints of far-field antenna testing, near-field methods are often used for equivalent generation to improve production efficiency.

[0037] Generally speaking, an antenna near-field measurement system is an automated measurement system controlled by a central computer that performs antenna near-field scanning, data acquisition, test data processing, and test result display and output. Near-field measurements are typically conducted in a darkroom. A darkroom is also known as an anechoic chamber, a microwave anechoic chamber, or an anechoic chamber. The primary function of a darkroom is to prevent interference from external electromagnetic waves, thereby isolating measurement activities from the external electromagnetic environment and preventing test signals from radiating outward and becoming interference sources, polluting the electromagnetic environment, and interfering with other electronic equipment. On the one hand, conducting tests in a darkroom ensures confidentiality and avoids external electromagnetic interference, ensuring stable and reliable operation. On the other hand, performing tests in the indoor test environment of a darkroom allows for 24 / 7 operation, unaffected by environmental factors.

[0038] In radar anechoic chamber testing, corner reflectors, also known as radar reflectors, are metal plates made of various sizes for different applications. When radar electromagnetic waves encounter corner reflectors, they are refracted and amplified at the metal corners, producing a strong echo signal. This, in turn, appears as a strong echo target on the radar's receiving system.

[0039] When setting up a test environment, it's important to ensure the angular reflector is aligned directly with the product antenna surface, with no inclination between them, to reduce radar measurement errors. This invention provides a radar test system adjustment method that addresses the prior art issue of difficulty aligning the angular reflector with the radar antenna when setting up a radar darkroom test environment.

[0040] Figure 1 FIG. 1 is a flowchart of a radar test system adjustment method according to an embodiment of the present invention. According to one aspect of the present invention, a radar test system adjustment method is provided, the method comprising:

[0041] Step 101: Adjusting a turntable in a darkroom so that the table surface is parallel to a horizontal plane;

[0042] Step 102: placing a first laser line marker on the turntable and driving the first laser line marker to emit a first laser beam toward a flat plate preset at a preset installation position of the diagonal mirror to generate a first cross-shaped cursor on the flat plate; and placing a second laser line marker at a preset height near the turntable and driving the second laser line marker to emit a second laser beam toward the flat plate to generate a second cross-shaped cursor on the flat plate;

[0043] Step 103: Adjust the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other;

[0044] Step 104: Adjust the pitch axis angle of the turntable so that the horizontal line of the first cross-shaped cursor coincides with the horizontal line of the second cross-shaped cursor, and adjust the placement position of the angle reflector based on the cross-shaped cursor of the first laser marking instrument so that the center position of the reflective surface of the angle reflector is aligned with the cross-shaped cursor of the first laser marking instrument.

[0045] Step 105: Remove the flat plate and place the corner reflector at the preset installation position, and adjust the turntable based on the center position of the reflective surface of the corner reflector so that the center position of the cross cursor corresponding to the first laser line marker is aligned with the center position of the reflective surface of the corner reflector, or adjust the position and angle of the corner reflector based on the center position of the cross cursor corresponding to the first laser line marker so that the center position of the reflective surface of the corner reflector is aligned with the center position of the cross cursor corresponding to the first laser line marker.

[0046] The above steps 101 to 105 are described in detail below.

[0047] In the above step 101, the turntable in the darkroom is adjusted so that the table surface of the turntable is parallel to the horizontal plane.

[0048] For example, a turntable is installed in a radar test chamber. During testing, the turntable is used to place the antenna under test. The transmitting antenna transmits a pulse signal in the opposite direction, and the receiving antenna reflects the echo signal in the opposite direction. The radar system tests the antenna based on the pulse signal and the echo signal.

[0049] Before testing, the spatial position of the turntable is preliminarily located according to the design requirements. The spatial installation positions of the turntable and the target to be measured are preliminarily set according to the layout diagram. An installation area is determined based on the distance between the turntable and the side walls and main walls. The same method is used to mark the installation position of the target to be measured, determine the installation positions of the four legs of the turntable, and place the turntable at the marked position.

[0050] Use a spirit level or level ruler to adjust the turntable so that the table surface is horizontal. After the turntable is installed, zero the pitch and azimuth respectively.

[0051] In the above step 102, a first laser line marker is placed on the turntable, and the first laser line marker is driven to emit a first laser beam toward a flat plate preset at a preset installation position of the diagonal mirror to generate a first cross-shaped cursor on the flat plate, and a second laser line marker with a preset height is placed near the turntable, and the second laser line marker is driven to emit a second laser beam toward the flat plate to generate a second cross-shaped cursor on the flat plate.

[0052] For example, to determine the optimal placement of the angle reflector, first use a flat plate to adjust the position and pitch angle of the turntable. Place a flat plate at the preset installation position of the angle reflector, facing the turntable, with a smooth surface and perpendicular to the ground.

[0053] At the same time, a first laser line marker is placed on the turntable, and a second laser line marker is placed near the turntable. Both laser line markers are used to emit cross beams, wherein the first laser line marker on the turntable is installed at the center of the turntable pitch axis.

[0054] Turn on both laser markers simultaneously, and emit a first crosshair and a second crosshair toward the flat panel. The horizontal line of the second crosshair emitted by the second laser marker is always horizontal. Therefore, using the second crosshair as a reference, adjust the first laser marker and the turntable so that the turntable is facing the flat panel, and thus the angle to be measured.

[0055] In the above step 103, the first laser marking device is adjusted so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other.

[0056] For example, the first laser line marker on the turntable is adjusted. When the first laser line marker is installed on the turntable, the first cross-shaped cursor emitted may be in any direction. Therefore, the first laser line marker is adjusted first. Specifically, the direction of the first cross-shaped cursor can be changed by rotating the adjustment knob so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other.

[0057] In the above step 104, the pitch axis angle of the turntable is adjusted so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor coincide with each other.

[0058] For example, after adjusting the first laser marker, the turntable's pitch angle is adjusted based on the first crosshair cursor to determine the zero position of the turntable's pitch axis. Specifically, the turntable's pitch angle is slightly adjusted so that the horizontal lines of the first and second crosshairs coincide. When the horizontal lines of the two crosshairs coincide, the turntable's pitch angle is currently at zero, completing the turntable adjustment.

[0059] In the above step 105, the flat plate is removed and the angle reflector is placed in the preset installation position, and the turntable is adjusted based on the center position of the reflective surface of the angle reflector so that the center position of the cross cursor corresponding to the first laser line marker is aligned with the center position of the reflective surface of the angle reflector, or, based on the center position of the cross cursor corresponding to the first laser line marker, the position and angle of the angle reflector are adjusted so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser line marker.

[0060] Exemplarily, at the preset installation position, the flat plate is moved away and the angle reflector is placed, or the turntable is adjusted, or the position and angle of the angle reflector are adjusted, so that the center position of the reflecting surface of the angle reflector is finally aligned with the center position of the cross cursor corresponding to the first laser marking instrument.

[0061] The present invention aims to address the technical issue of difficulty aligning an angle reflector with a radar antenna. Therefore, after adjusting the turntable, the focus is on adjusting the angle reflector's position. Specifically, the flat plate is removed, while the crosshair cursor of the first laser line marker remains stationary, and the angle reflector's position is adjusted. By adjusting the reflective surface of the angle reflector in various directions, the center of the reflective surface is finally aligned with the crosshair cursor of the first laser line marker.

[0062] In the present invention, the position and angle of the turntable and the angle reflector are adjusted by two laser line markers without relying on the reflection device, thereby avoiding the measurement error caused by the installation deviation of the reflection device. The measurement angle of the radar can be improved by optimizing the positional relationship between the antenna and the angle reflector.

[0063] Furthermore, in the above step 103, adjusting the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other includes:

[0064] The roll axis angle of the first laser marking device is adjusted until the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other.

[0065] For example, for the first laser line marker, the position of the device or the first crosshair cursor of the light beam can be adjusted by rotation on three axes: the horizontal axis (pitch axis), the vertical axis (roll axis), and the vertical axis (yaw axis). When adjusting the first laser line marker, if the pitch axis is adjusted, the first crosshair cursor on the square plate will move up and down; if the yaw axis is adjusted, the first crosshair cursor on the square plate will move left and right; if the pitch axis is adjusted, the first crosshair cursor on the square plate will rotate in place. Therefore, in this step, the roll axis angle of the first laser line marker is adjusted until the horizontal line of the first crosshair cursor and the horizontal line of the second crosshair cursor are parallel to each other.

[0066] Furthermore, the method further comprises:

[0067] Before adjusting the pitch axis angle of the turntable, the first laser marking device is fixed on the turntable.

[0068] For example, after the adjustment of the first laser marking instrument is completed, the first laser marking instrument needs to be fixed on the turntable to prevent the first laser marking instrument from moving, so that the turntable can be adjusted.

[0069] Furthermore, the method further comprises:

[0070] After adjusting the pitch axis angle of the turntable so that the horizontal line of the first cross cursor and the horizontal line of the second cross cursor coincide with each other, it is determined that the current pitch axis angle of the turntable is a pitch angle of zero degrees.

[0071] For example, when the horizontal lines of the two cross-shaped cursors overlap, it indicates that the current pitch angle of the turntable is the most accurate angle, and therefore the current pitch axis angle of the turntable is determined to be a zero pitch angle, that is, the turntable is at zero position.

[0072] Furthermore, in the above step 105, adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marking instrument so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser marking instrument includes:

[0073] The angle of the reflecting surface is adjusted by a plumb line so that the reflecting surface is perpendicular to the ground, and the spatial placement position of the angle reflector is adjusted so that the center position of the reflecting surface is aligned with the center position of the cross cursor corresponding to the first laser marking instrument.

[0074] For example, when adjusting the angle reflector, in order to make the reflecting surface of the angle reflector perpendicular to the ground, the angle of the reflecting surface can be adjusted by a plumb line, and the center position of the reflecting surface can be aligned with the center point of the cross cursor of the first laser marker. After accurately adjusting the installation position of the angle reflector, the angle reflector is fixed, and after verification and calibration, it is ready for testing.

[0075] Furthermore, the method further comprises:

[0076] After adjusting the turntable based on the center position of the reflecting surface of the angle reflector or adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marker, the zero-degree pitch angle of the turntable is adjusted based on the first laser marker and the angle reflector.

[0077] For example, in order to ensure the measurement accuracy and precision of the radar, after adjusting the turntable and the angle reflector, the positional relationship between the turntable and the angle reflector is verified to determine whether the turntable is aligned with the center of the angle reflector at zero position, that is, whether the zero-degree pitch angle is accurate, and the zero-degree pitch angle is further fine-tuned.

[0078] Furthermore, the adjusting the zero-degree pitch angle of the turntable based on the first laser marking instrument and the angle counter comprises:

[0079] Adjust the pitch axis angle of the turntable from the zero-degree pitch angle to the preset pitch angle, then restore the pitch axis angle of the turntable from the preset pitch angle to the zero-degree pitch angle, adjust the azimuth axis angle and the pitch axis angle of the turntable so that the center position of the cross cursor corresponding to the first laser marker is aligned with the center position of the reflective surface of the angle reflector, and update the zero-degree pitch angle according to the current pitch axis angle of the turntable.

[0080] For example, after installation is complete, the turntable's azimuth axis is controlled to rotate the turntable a certain number of degrees, then returned to a zero-degree pitch angle (zero position). The turntable's built-in first laser marker is used to observe whether the center of the crosshairs is aligned with the center of the angle inversion. If there is a deviation, the turntable itself is determined to be corrected. If the deviation is too large, the turntable itself needs to be moved for adjustment. If the deviation is small, the distance between the center of the first laser marker's current crosshairs and the center of the angle inversion is determined. If the distance is small, software adjustments can be made to meet the test standard. If the distance is large, the determined zero-degree pitch angle is inaccurate, and the adjustment steps can be repeated to meet the test standard.

[0081] Furthermore, the second laser marking device having a preset height is placed near the turntable and includes:

[0082] The height of the first laser marking instrument is obtained, and the height of the second laser marking instrument is determined based on the height of the first laser marking instrument, wherein a height difference between the first laser marking instrument and the second laser marking instrument is less than a preset threshold.

[0083] For example, to accurately determine the position of the angle reflection, the height of the second laser line marker needs to be precisely determined. For example, the height of the second laser line marker should be consistent with the height of the radar antenna on the turntable, or with the height of the first laser line marker. In specific applications, this can be determined according to needs and is not limited in this invention.

[0084] Furthermore, the first laser marking device is installed on the center of the pitch axis of the turntable.

[0085] For example, in order to make the turntable diagonally opposite, when installing the first laser marker, it is installed on the center of the pitch axis of the turntable.

[0086] Furthermore, the second laser marking instrument is a laser level.

[0087] For example, in order to precisely maintain the horizontal line of the second cross-shaped cursor horizontal, the second laser marking instrument may be a laser level.

[0088] Through one or more of the above embodiments of the present invention, at least the following technical effects can be achieved:

[0089] In the technical solution disclosed in this invention, two laser line markers are used to adjust the position and angle of the turntable and the reflector, ensuring that the reflector is aligned with the antenna surface, with no inclination between them. During debugging, this solution eliminates manual errors introduced by uneven force applied during reflector attachment. It also eliminates reliance on a reflector, thus avoiding measurement errors caused by reflector installation deviations. By optimizing the positional relationship between the antenna and reflector, the radar's measurement angle is improved, enhancing debugging accuracy.

[0090] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A radar test system adjustment method, characterized in that: The method comprises: Adjusting the turntable in the darkroom so that the table surface of the turntable is parallel to the horizontal plane; A first laser marking instrument is placed on the turntable, and is driven to emit a first laser beam toward a flat plate preset at a preset installation position of the diagonal mirror to generate a first cross-shaped cursor on the flat plate; and a second laser marking instrument is placed near the turntable at a preset height, and is driven to emit a second laser beam toward the flat plate to generate a second cross-shaped cursor on the flat plate; adjusting the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other; adjusting the pitch axis angle of the turntable so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor coincide with each other; Remove the flat plate and place the angle reflector at the preset installation position, and adjust the turntable based on the center position of the reflective surface of the angle reflector so that the center position of the cross cursor corresponding to the first laser line marker is aligned with the center position of the reflective surface of the angle reflector, or adjust the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser line marker so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser line marker.

2. The method according to claim 1, wherein The adjusting the first laser marking device so that the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other comprises: The roll axis angle of the first laser marking device is adjusted until the horizontal line of the first cross-shaped cursor and the horizontal line of the second cross-shaped cursor are parallel to each other.

3. The method according to claim 2, wherein The method further comprises: Before adjusting the pitch axis angle of the turntable, the first laser marking device is fixed on the turntable.

4. The method according to claim 3, wherein The method further comprises: After adjusting the pitch axis angle of the turntable so that the horizontal line of the first cross cursor and the horizontal line of the second cross cursor coincide with each other, it is determined that the current pitch axis angle of the turntable is a pitch angle of zero degrees.

5. The method according to claim 4, wherein The adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marking instrument so that the center position of the reflective surface of the angle reflector is aligned with the center position of the cross cursor corresponding to the first laser marking instrument comprises: The angle of the reflecting surface is adjusted by a plumb line so that the reflecting surface is perpendicular to the ground, and the spatial placement position of the angle reflector is adjusted so that the center position of the reflecting surface is aligned with the center position of the cross cursor corresponding to the first laser marking instrument.

6. The method according to claim 5, wherein The method further comprises: After adjusting the turntable based on the center position of the reflecting surface of the angle reflector or adjusting the position and angle of the angle reflector based on the center position of the cross cursor corresponding to the first laser marker, the zero-degree pitch angle of the turntable is adjusted based on the first laser marker and the angle reflector.

7. The method according to claim 6, wherein The zero-degree pitch angle adjustment of the turntable based on the first laser marking instrument and the angle counter comprises: Adjust the pitch axis angle of the turntable from the zero-degree pitch angle to the preset pitch angle, then restore the pitch axis angle of the turntable from the preset pitch angle to the zero-degree pitch angle, adjust the azimuth axis angle and the pitch axis angle of the turntable so that the center position of the cross cursor corresponding to the first laser marker is aligned with the center position of the reflective surface of the angle reflector, and update the zero-degree pitch angle according to the current pitch axis angle of the turntable.

8. The method according to claim 1, wherein The second laser marking device having a preset height is placed near the turntable and includes: The height of the first laser marking instrument is obtained, and the height of the second laser marking instrument is determined based on the height of the first laser marking instrument, wherein a height difference between the first laser marking instrument and the second laser marking instrument is less than a preset threshold.

9. The method according to claim 1, wherein The first laser marking device is installed on the center of the pitch axis of the turntable.

10. The method according to claim 1, wherein The second laser marking instrument is a laser level.

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