Methods, devices and electronic equipment for directional placement of corner reflectors

Abstract

This invention relates to the fields of geodesy and radar engineering technology, and discloses a method, apparatus, and electronic equipment for the directional deployment of corner reflectors. The method includes: determining two measurement reference points in the proposed deployment area of ​​the corner reflector and obtaining the geodetic coordinates of the measurement reference points, and then calculating the reference azimuth angle of the baseline between the measurement reference points relative to true north; using the reference azimuth angle as a reference, marking two auxiliary points in the proposed deployment area of ​​the corner reflector and determining the local physical baseline; obtaining the design azimuth angle of the corner reflector and calculating the azimuth angle difference between the design azimuth angle and the reference azimuth angle; and using the local physical baseline as a reference, directionally deploying the corner reflector according to the azimuth angle difference. The method provided by this invention can still stably obtain an absolute physical reference pointing to true north even in extreme electromagnetic environments such as substations and building complexes, realizing high-precision deployment of corner reflectors in areas with strong interference.

Description

Technical Field

[0001] This invention relates to the fields of geodesy and radar engineering technology, specifically to methods, devices, and electronic equipment for the directional deployment of corner reflectors. Background Technology

[0002] Currently, the azimuth setting of corner reflectors typically relies on handheld magnetic compasses, geological compasses, or electronic compass apps built into smartphones. Operators determine the orientation of the corner reflector on-site by finding magnetic north and combining this with local magnetic declination correction.

[0003] Traditional methods rely on geomagnetic field orientation. However, in urban environments, the ubiquitous steel structures of high-rise buildings, underground utility tunnels, high-voltage power lines, and communication base stations create complex electromagnetic interference fields. This interference causes nonlinear, random distortions in the local geomagnetic field (commonly known as "magnetic anomalies"). These distortions are neither fixed nor predictable, and cannot be eliminated through conventional calibration methods. This renders "magnetic north" unreliable in urban areas, leading to significant deviations of several degrees or even tens of degrees in measurement results.

[0004] Existing magnetic compass-based deployment methods only measure the "magnetic azimuth." Since InSAR satellite orbital parameters are based on the "true north" coordinate system, operators must additionally consult local magnetic declination data for the current year and perform manual corrections. However, magnetic declination drifts over time and varies geographically, making it easy to introduce additional systematic biases during field operations by using outdated magnetic declination data or confusing the "addition / subtraction" calculation logic. This non-intuitive process, relying on manual correction, increases the complexity and error rate of the operation. Summary of the Invention

[0005] This invention provides a method, apparatus, and electronic device for directional deployment of corner reflectors, in order to solve the problem that traditional magnetic force measurement methods are severely interfered with in complex urban electromagnetic environments, resulting in poor directional accuracy and uncontrollability of corner reflector deployment.

[0006] In a first aspect, the present invention provides a method for directional placement of a corner reflector, the method comprising:

[0007] Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point;

[0008] Based on the geodetic coordinates of the measurement reference points, calculate the reference azimuth angle of the baseline between the measurement reference points relative to true north.

[0009] Using the reference azimuth as a reference, mark at least two auxiliary points in the area where the corner reflector is to be deployed, and determine the local entity baseline based on the at least two auxiliary points;

[0010] Obtain the design azimuth angle of the corner reflector and calculate the azimuth angle difference between the design azimuth angle and the reference azimuth angle;

[0011] Using the local physical baseline as a reference, the corner reflectors are oriented and deployed according to the azimuth difference.

[0012] This invention provides a method for directional deployment of corner reflectors, utilizing geodetic coordinates to construct a geometric reference. This transformation eliminates the influence of paramagnetic or ferromagnetic materials such as steel reinforcement in high-rise buildings, underground high-voltage cables, and communication base stations on the deployment of corner reflectors. Compared to the random deviations of several degrees often found in traditional magnetic compasses in urban environments, the method provided by this invention can still stably obtain an absolute physical reference pointing to true north even in extreme electromagnetic environments such as substations and building complexes. This enables high-precision deployment of corner reflectors in areas with strong interference, solving the problem of poor directional accuracy and uncontrollable deployment of corner reflectors due to severe interference with traditional magnetic measurement methods in complex urban electromagnetic environments.

[0013] In one optional implementation, at least two measurement reference points are determined in the area where the corner reflector is to be deployed, and the geodetic coordinates of each measurement reference point are obtained, including:

[0014] In the area where the corner reflector is to be installed, select at least two arbitrary points with a line of sight as measurement reference points;

[0015] Three-dimensional coordinate measurements were performed on each measurement benchmark point, and the average value of the coordinate measurements was calculated using a multi-epoch continuous observation mode to obtain the geodetic coordinates of each measurement benchmark point.

[0016] This invention provides a method for directional deployment of corner reflectors. By selecting any point with a line of sight as a reference point and employing a multi-epoch continuous observation and averaging approach to obtain high-precision geodetic coordinates, it avoids the environmental interference problems inherent in traditional magnetic measurements. Its measurement principle, based on pure geometric coordinates, is unaffected by electromagnetic fields, ensuring the stability and reliability of the reference data.

[0017] In one alternative implementation, determining at least two measurement reference points in the area where the corner reflector is to be deployed further includes:

[0018] The line connecting at least two measurement reference points or their extensions must cover the actual installation location of the corner reflector and satisfy the error circle model verification; the error circle model verification is achieved using the following constraints:

[0019] ;

[0020] in, Baseline length; The nominal plane accuracy of the measuring equipment; Set the maximum permissible azimuth angle error for the corner reflector.

[0021] This invention provides a method for the directional deployment of corner reflectors. By introducing an error circle model and establishing a quantitative constraint relationship between baseline length and maximum permissible azimuth error, the unpredictable and uncontrollable random errors in traditional methods are transformed into calculable parameters that can be controlled in advance through design. This allows the final accuracy of the entire orientation process to be theoretically predicted and engineering-guaranteed before deployment.

[0022] In one optional implementation, the reference azimuth angle between the measurement reference points relative to true north is calculated based on the geodetic coordinates of the measurement reference points, including:

[0023] Convert the geodetic coordinates of the measurement benchmark point to plane rectangular coordinates;

[0024] Calculate the coordinate azimuth angle of the baseline between the measurement reference points relative to coordinate north, based on the plane rectangular coordinate system.

[0025] Calculate the meridian convergence angle correction value;

[0026] The coordinate azimuth is corrected by adjusting the meridian convergence angle to obtain the reference azimuth between the measurement reference points relative to true north.

[0027] This invention provides a method for directional deployment of corner reflectors. By converting geodetic coordinates to planar coordinates and calculating the azimuth, and then accurately calculating the meridian convergence angle based on the latitude and longitude of the measuring point and projection zone parameters for correction, the true north azimuth is directly obtained. The entire process relies entirely on deterministic mathematical and geometric calculations, completely eliminating the dependence on geomagnetic field data and artificial magnetic declination corrections. This fundamentally eliminates systematic deviations introduced by inaccurate magnetic declination data, calculation errors, or electromagnetic interference, ensuring strict consistency between the measurement reference and the true north coordinate system used in satellite orbits.

[0028] In one alternative implementation, the meridian convergence angle correction value is calculated using the following formula:

[0029] ;

[0030] in, This is the correction value for the meridian convergence angle. This is the difference between the average longitude between the reference points and the longitude of the central meridian of the projection zone. , To measure the average longitude between reference points, To measure the average dimension between reference points, This represents the longitude of the central meridian of the projection zone.

[0031] In one optional implementation, using a reference azimuth angle as a reference, at least two auxiliary points are marked in the area where the corner reflector is to be deployed, and a local entity baseline is determined based on the at least two auxiliary points, including:

[0032] Using the reference azimuth angle as a reference, a laser beam is emitted from one of the measurement reference points to another measurement reference point to obtain a laser reference line between the measurement reference points;

[0033] Along the projection path of the laser reference line, two auxiliary points are marked in the proposed placement area of ​​the corner reflector by using the laser spot centroid interception and vertical projection method. The local entity reference line is determined based on the two auxiliary points. The two auxiliary points are distributed on both sides of the proposed placement position of the corner reflector, and the local entity reference line passes through the geometric center of the corner reflector.

[0034] This invention provides a method for directional deployment of corner reflectors. The calculated true north azimuth is visualized on-site as a high-precision laser reference line using laser technology, and then precisely anchored as a local physical reference line using spot centroid interception and vertical projection techniques. This process achieves non-destructive and intuitive transmission of remote geometric references to the work site, while also utilizing a cross-vertical deployment design that allows the reference line to pass directly through the center of the corner reflector.

[0035] In one optional implementation, obtaining the design azimuth angle of the corner reflector and calculating the azimuth difference between the design azimuth angle and the reference azimuth angle includes:

[0036] Based on the satellite orbit parameters of the InSAR monitoring mission, determine the theoretically required design azimuth angle for the corner reflector to be aligned.

[0037] Calculate the azimuth difference between the design azimuth and the reference azimuth. The azimuth difference is the angle that the corner reflector needs to physically rotate relative to the local physical baseline when it is deployed.

[0038] This invention provides a method for the directional deployment of corner reflectors. By precisely comparing and calculating the theoretically designed azimuth angle of the satellite orbit with the actual measured true north azimuth angle, the specific angle value required for the corner reflector to rotate is directly output. This process achieves a precise connection between the theoretical requirements of the InSAR system and the actual deployment operation, transforming the complex spatial geometric alignment problem into a clear, executable mechanical rotation command that requires no manual intervention. This fundamentally eliminates operational errors caused by manual interpretation or conversion of satellite parameters.

[0039] In one optional implementation, the corner reflectors are oriented and deployed based on the azimuth difference, using a local physical baseline as a reference.

[0040] The direction of the local entity baseline is used as the zero-degree reference axis;

[0041] If the azimuth difference is positive, the control corner reflector rotates clockwise horizontally relative to the zero-degree reference axis by the azimuth difference value.

[0042] If the azimuth difference is negative, the control corner reflector will rotate counterclockwise horizontally relative to the zero-degree reference axis by the azimuth difference.

[0043] If the absolute value of the calculated result is greater than the preset degree, the azimuth difference value will be normalized to the preset degree range, and the direction with the shortest rotation path will be selected for operation.

[0044] The present invention provides a method for directional placement of corner reflectors, which uses the local physical baseline as the absolute reference axis and provides intuitive operating rules. It also establishes a deterministic rotation direction command based on the difference sign and an intelligent angle normalization strategy. This allows on-site personnel to perform rotation operations simply by following the explicit numerical commands without relying on experience or making complex direction judgments.

[0045] In a second aspect, the present invention provides a directional placement device for a corner reflector, the device comprising:

[0046] The benchmark point and corresponding alignment determination module is used to determine at least two measurement benchmark points in the area where the corner reflector is to be deployed, and to obtain the geodetic coordinates of each measurement benchmark point;

[0047] The reference azimuth calculation module is used to calculate the reference azimuth angle between measurement reference points relative to true north, based on the geodetic coordinates of the measurement reference points.

[0048] The local entity baseline determination module is used to mark at least two auxiliary points in the proposed area of ​​the corner reflector based on the reference azimuth angle, and determine the local entity baseline based on the at least two auxiliary points.

[0049] The azimuth difference calculation module is used to obtain the design azimuth of the corner reflector and calculate the azimuth difference between the design azimuth and the reference azimuth.

[0050] The corner reflector orientation module is used to orient corner reflectors based on the azimuth difference, with the local entity baseline as a reference.

[0051] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the directional placement method of the corner reflector described in the first aspect or any corresponding embodiment thereof.

[0052] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the directional placement method of the corner reflector according to the first aspect or any corresponding embodiment thereof.

[0053] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the directional placement method of the corner reflector described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0054] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a schematic flowchart of the first method for directional placement of corner reflectors according to an embodiment of the present invention;

[0056] Figure 2 This is a schematic diagram of a second method for directional placement of corner reflectors according to an embodiment of the present invention;

[0057] Figure 3 This is a schematic diagram of the third process of the directional placement method of the corner reflector according to an embodiment of the present invention;

[0058] Figure 4 This is a schematic diagram of the error circle of an RTK (Real-Time Kinematic) device according to an embodiment of the present invention;

[0059] Figure 5 This is a structural block diagram of a directional placement device for a corner reflector according to an embodiment of the present invention;

[0060] Figure 6 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0062] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0063] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] InSAR (Interferometric Synthetic Aperture Radar) technology is widely used for monitoring urban surface deformation. To ensure the stability and reliability of the monitoring signal, artificial corner reflectors need to be deployed at specific locations. The radar cross-section of a corner reflector is closely related to its azimuth angle relative to its line of sight to the satellite; angular deviations can cause a sharp drop in echo signal strength, affecting monitoring results. In the complex electromagnetic environment of cities, traditional magnetic measurement methods (compasses / apps) are severely interfered with, leading to poor pointing accuracy and uncontrollable issues with corner reflector deployment.

[0065] Based on this, this invention provides a method for directional deployment of corner reflectors. By introducing RTK (Real-Time Kinematic) baseline vector calculation technology from geodesy and combining it with a quantitative constraint model of azimuth error and baseline length, this method solves the technical problem that traditional magnetic measurement methods (compass / APP) are severely interfered with in complex urban electromagnetic environments, resulting in poor pointing accuracy and uncontrollability of corner reflector deployment.

[0066] According to an embodiment of the present invention, a method for directional placement of a corner reflector is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0067] This embodiment provides a method for directional placement of corner reflectors, which can be used in the aforementioned electronic devices. Figure 1 This is a flowchart of a method for directional placement of corner reflectors according to an embodiment of the present invention, as follows: Figure 1 As shown, the process includes the following steps:

[0068] Step S101: Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point.

[0069] Specifically, a corner reflector is a radar corner reflector, which is an artificially set strong radar wave reflecting device. Its core function is to provide a stable, reliable and high-intensity echo signal source for synthetic aperture radar (SAR / InSAR) systems.

[0070] The measurement reference point was selected in an open area around the corner reflector deployment area, thus avoiding strong electromagnetic interference sources such as building steel bars and cables, ensuring that the subsequent RTK equipment can receive clean satellite signals and obtain high-precision coordinates.

[0071] In this embodiment, two measurement reference points are set: measurement reference point O1 (O1 is the emission point) and measurement reference point O2 (O2 is the distance view point).

[0072] Measurements taken using RTK (Real-Time Kinematic) equipment yielded three-dimensional geodetic coordinates for the two measurement reference points, based on a global geocentric coordinate system (such as WGS-84). The mathematical vector defined by these two coordinates contains true north information that is independent of any local geomagnetic field and consistent with the satellite orbital coordinate system.

[0073] The purpose of measuring reference points is to establish a controllable baseline from a clean location using absolute coordinates, thereby providing a unique and reliable initial direction reference for the entire anti-interference orientation process.

[0074] Step S102: Based on the geodetic coordinates of the measurement reference points, calculate the reference azimuth angle between the reference points and the true north direction.

[0075] Specifically, the high-precision geodetic coordinates obtained from the measurement benchmark are used to calculate the accurate benchmark azimuth of the vector connecting the two points relative to true north through three steps: coordinate projection transformation, coordinate azimuth calculation, and meridian convergence angle correction.

[0076] That is, using the high-precision coordinates of points O1 and O2, the precise reference azimuth angle of the baseline O1O2 relative to true north is calculated through Gaussian projection coordinate inverse calculation or geodetic calculation formula. This step determines the direction entirely based on the geometric coordinate relationship in step S201, without relying on any geomagnetic field information, thus avoiding systematic errors caused by magnetic declination correction and urban electromagnetic interference in principle.

[0077] Step S103: Using the reference azimuth angle as a reference, mark at least two auxiliary points in the area where the corner reflector is to be deployed, and determine the local entity baseline based on the at least two auxiliary points.

[0078] For example, a laser emitting device is set up at the emission point O1, and its emission center is strictly aligned with the distant viewing point O2 to establish a visual laser beam reference line in space; then, within the local working range where the corner reflector is actually to be deployed, two auxiliary points P1 and P2 are precisely marked on the ground along the projection path of the laser beam, thereby transmitting the long-distance reference orientation remotely without loss and extracting it as the local physical reference line P1P2.

[0079] Step S104: Obtain the design azimuth angle of the corner reflector and calculate the azimuth angle difference between the design azimuth angle and the reference azimuth angle.

[0080] Specifically, based on the satellite orbit parameters of the InSAR monitoring mission, the theoretically required design azimuth angle for the corner reflector to be aligned is determined. ; Calculate the azimuth difference between the design azimuth and the reference azimuth calculated in step two. The azimuth difference is the angle that the corner reflector needs to physically rotate relative to the local physical baseline P1P2 when it is deployed.

[0081] Step S105: Using the local entity baseline as a reference, the corner reflector is oriented and deployed according to the azimuth difference.

[0082] Specifically, the corner reflector is placed near local auxiliary points P1 and P2. Using angle measuring auxiliary equipment (such as a total station, scale, or angle ruler), with the local physical baseline P1P2 as the zero-degree reference axis, the pointing axis of the corner reflector is rotated horizontally. Angle; after the angle is adjusted to the correct position, lock the corner reflector base and fasteners to complete the high-precision anti-interference deployment of the corner reflector.

[0083] The directional deployment method for corner reflectors provided in this embodiment utilizes geodetic coordinates to construct a geometric reference. This transformation eliminates the influence of paramagnetic or ferromagnetic materials such as steel reinforcement in high-rise buildings, underground high-voltage cables, and communication base stations on the deployment of corner reflectors. Compared to the random deviations of several degrees often found in traditional magnetic compasses in urban areas, the method provided by this invention can still stably obtain an absolute physical reference pointing to true north even in extreme electromagnetic environments such as substations and building complexes. This achieves high-precision deployment of corner reflectors in areas with strong interference, solving the problem of poor directional accuracy and uncontrollable deployment of corner reflectors due to severe interference with traditional magnetic measurement methods in complex urban electromagnetic environments.

[0084] This embodiment provides a method for directional placement of corner reflectors, which can be used in the aforementioned electronic devices. Figure 2 This is a flowchart of a method for directional placement of corner reflectors according to an embodiment of the present invention, as follows: Figure 2 As shown, the process includes the following steps:

[0085] Step S201: Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point.

[0086] Specifically, step S201 includes:

[0087] Step S2011: In the area where the corner reflector is to be deployed, select at least two arbitrary points with a line of sight as measurement reference points.

[0088] Specifically, firstly, in an open area surrounding the proposed deployment area of ​​the corner reflector, two arbitrary points with good visibility and GNSS (Global Navigation Satellite System) signal reception conditions are selected as measurement reference points, defined as the transmission point O1 and the far-view point O2, respectively. It is ensured that the line connecting the two measurement reference points or its extension can cover the actual installation position of the corner reflector, and the error circle model verification must be satisfied.

[0089] The error circle model verification includes: the distance between the launch point O1 and the far-view point O2 needs to be calculated based on the accuracy of the RTK measurement equipment and the azimuth angle layout error requirements. In actual measurement, the RTK equipment does not acquire an absolute geometric point, but rather an "error circle" with the true coordinates as the center and the nominal positioning accuracy σ as the radius, such as... Figure 4 As shown, there is an error circle C1 at the emission point O1 with a radius of [missing information]. The emission point O2 has an error circle C2 with a radius of [missing information]. The true azimuth angle of the baseline O1O2 between the launch point O1 and the distant viewpoint O2 lies between the limiting tangents of the two error circles. When the baseline length... When the length is shorter, the relative angle of the error circle is larger, and the azimuth error is greater. Maximum; when the baseline length As the angle increases, the relative angle of the error circle decreases, and the azimuth error... It converged rapidly.

[0090] To meet the design and installation accuracy requirements of the corner reflector, the maximum allowable azimuth error is set as follows: The baseline length must be specified. Set a minimum threshold. Based on plane geometry, determine the maximum error of the azimuth angle under the worst-case scenario (i.e., true north is located at the outermost tangent of the error circle). Satisfies the following trigonometric function relationships:

[0091] (1);

[0092] Take here Because in the worst case, O1 is biased to one side. O2, on the other hand, tends to be concentrated on the other side. The relative errors are superimposed.

[0093] Therefore, the baseline length constraint model is derived as follows:

[0094] (2);

[0095] in, Baseline length; The nominal plane accuracy of the measuring equipment; Set the maximum permissible azimuth angle error for the corner reflector.

[0096] In step S2012, three-dimensional coordinate measurements are performed on each measurement reference point, and the average value of the coordinate measurements is calculated using a multi-epoch continuous observation mode to obtain the geodetic coordinates of each measurement reference point.

[0097] Specifically, RTK equipment was used to measure the coordinates of measurement reference point O1 and measurement reference point O2 respectively. In order to eliminate the error of a single measurement, a multi-epoch continuous observation mode was used to take the average value at each measurement reference point, so as to obtain the high-precision three-dimensional geodetic coordinates of the two measurement reference points.

[0098] Step S202: Based on the geodetic coordinates of the measurement reference points, calculate the reference azimuth angle between the reference points and the true north direction.

[0099] Specifically, step S202 includes:

[0100] Step S2021: Convert the geodetic coordinates of the measurement reference point into plane rectangular coordinates.

[0101] Specifically, the Gauss-Kruger projection or UTM projection (Universal Transverse Mercator) algorithm is used to convert the spherical geodetic coordinates of two points into plane rectangular coordinates, thereby transforming the complex ellipsoidal geometry problem into a plane geometry problem.

[0102] Step S2022: Calculate the coordinate azimuth angle of the baseline between the measurement reference points relative to coordinate north, based on the plane rectangular coordinates.

[0103] Specifically, the coordinate increments dx and dy of the vector from measurement reference point O1 to measurement reference point O2 on the vertical axis (north) and horizontal axis (east) are calculated. The quadrant angle is calculated using inverse trigonometric functions, and the quadrant in which the vector is located is determined based on the sign of the coordinate increment. The coordinate azimuth angle of the baseline relative to coordinate north is then calculated. .

[0104] The coordinate increments dx and dy are expressed by the following formulas:

[0105] (3);

[0106] (4);

[0107] Quadrant angles are represented as:

[0108] (5);

[0109] in, The value of is between 0 and π / 2.

[0110] Coordinate azimuth The calculation formulas are shown in Table 1 below:

[0111] Table 1. Coordinate Azimuth

[0112]

[0113] Step S2023: Calculate the meridian convergence angle correction value.

[0114] To eliminate the directional distortion error caused by map projection, a meridian convergence angle correction value is introduced for correction.

[0115] In one alternative implementation, the meridian convergence angle correction value is calculated using the following formula:

[0116] (6);

[0117] in, This is the correction value for the meridian convergence angle. This is the difference between the average longitude between the reference points and the longitude of the central meridian of the projection zone. , To measure the average longitude between reference points, To measure the average dimension between reference points, This represents the longitude of the central meridian of the projection zone.

[0118] Step S2024: Correct the coordinate azimuth angle according to the meridian convergence angle correction value to obtain the reference azimuth angle of the baseline between the measurement reference points relative to the true north direction.

[0119] Specifically, the coordinate azimuth angle Corrected to a reference azimuth that strictly points to true north, the geographic North Pole. This step ensures that the measurement reference is completely consistent with the true north coordinate system used for InSAR satellite orbital parameters, thus eliminating systematic orientation errors caused by magnetic declination and electromagnetic interference in principle.

[0120] Step S203: Using the reference azimuth angle as a reference, mark at least two auxiliary points in the area where the corner reflector is to be deployed, and determine the local entity baseline based on the at least two auxiliary points. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0121] Step S204: Obtain the design azimuth angle of the corner reflector and calculate the azimuth angle difference between the design azimuth angle and the reference azimuth angle. For details, please refer to [link to relevant documentation]. Figure 1 Step S104 of the illustrated embodiment will not be described again here.

[0122] Step S205: Using the local entity baseline as a reference, orient the corner reflectors according to the azimuth difference. For details, please refer to [link to relevant documentation]. Figure 1 Step S105 of the illustrated embodiment will not be described again here.

[0123] The directional deployment method of the corner reflector provided in this embodiment selects any point with a line of sight as a reference point and obtains high-precision geodetic coordinates by averaging continuous observations over multiple epochs. This avoids the problem of environmental interference in traditional magnetic field measurements from the outset. By converting the geodetic coordinates into plane coordinates and calculating the coordinate azimuth, and then accurately calculating the meridian convergence angle based on the latitude and longitude of the measuring point and the projection zone parameters for correction, the true north azimuth is finally obtained directly. The entire process relies entirely on deterministic mathematical and geometric calculations, completely eliminating the dependence on geomagnetic field data and artificial magnetic declination correction.

[0124] This embodiment provides a method for directional placement of corner reflectors, which can be used in the aforementioned electronic devices. Figure 3 This is a flowchart of a method for directional placement of corner reflectors according to an embodiment of the present invention, as follows: Figure 3 As shown, the process includes the following steps:

[0125] Step S301: Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point. For details, please refer to [link to relevant documentation]. Figure 2 Step S201 of the illustrated embodiment will not be described again here.

[0126] Step S302: Based on the geodetic coordinates of the measurement reference points, calculate the reference azimuth angle of the baseline between the measurement reference points relative to true north. For details, please refer to [link to relevant documentation]. Figure 2 Step S202 of the illustrated embodiment will not be described again here.

[0127] Step S303: Using the reference azimuth angle as a reference, mark at least two auxiliary points in the area where the corner reflector is to be deployed, and determine the local entity baseline based on the at least two auxiliary points.

[0128] Specifically, step S303 includes:

[0129] Step S3031: Using the reference azimuth angle as a reference, a laser beam is emitted from one of the measurement reference points to another measurement reference point to obtain a laser reference line between the measurement reference points.

[0130] Specifically, a laser emitting device is set up at the emission point O1, and its emission center is strictly aligned with the distant viewing point O2 to establish a visual laser beam reference line in space.

[0131] In step S3032, along the projection path of the laser reference line, two auxiliary points are marked in the proposed placement area of ​​the corner reflector using the laser spot centroid interception and vertical projection method. The local entity reference line is determined based on the two auxiliary points. The two auxiliary points are distributed on both sides of the proposed placement position of the corner reflector, and the local entity reference line passes through the geometric center of the corner reflector.

[0132] Specifically, within the local operating range where the corner reflector is actually to be deployed, two auxiliary points P1 and P2 are precisely marked on the ground along the projection path of the laser beam, thereby transmitting the long-distance reference orientation remotely without loss and extracting it as the local physical reference line P1P2.

[0133] The precise marking methods and principles for auxiliary points P1 and P2 are as follows:

[0134] The specific marking process employs a spot centroid interception and vertical projection method. The operator uses a receiving plate with crosshairs to intercept the laser beam from the emission point O1. After moving the plate to ensure the energy centroid of the laser spot precisely coincides with the center of the crosshairs, the center point is vertically projected onto the ground using a laser alignment device or a physical plumb line, and marked as auxiliary points P1 and P2 respectively.

[0135] Auxiliary points P1 and P2 are distributed on both sides of the proposed installation location of the corner reflector (spanning vertically), so that the local solid baseline connecting P1 and P2 passes directly through the geometric center of the corner reflector, which facilitates the subsequent centering and leveling of the base.

[0136] Step S304: Obtain the design azimuth angle of the corner reflector and calculate the azimuth angle difference between the design azimuth angle and the reference azimuth angle.

[0137] Specifically, step S304 includes:

[0138] Step S3041: Determine the design azimuth angle that the corner reflector should theoretically be aligned with based on the satellite orbit parameters of the InSAR monitoring mission.

[0139] Step S3042: Calculate the azimuth difference between the design azimuth and the reference azimuth. The azimuth difference is the angle value that the corner reflector needs to physically rotate relative to the local physical baseline when it is deployed.

[0140] Specifically, calculate the design azimuth angle. With the calculated reference azimuth angle azimuth difference between This difference is the angle that the corner reflector needs to physically rotate relative to the local physical baseline P1P2 when it is deployed.

[0141] Step S305: Using the local entity baseline as a reference, the corner reflector is oriented and deployed according to the azimuth difference.

[0142] Specifically, the corner reflector is placed near local auxiliary points P1 and P2. Using angle measuring auxiliary equipment (such as a total station, scale, or angle ruler), with the local physical baseline P1P2 as the zero-degree reference axis, the pointing axis of the corner reflector is horizontally rotated according to the calculation in step four. Angle; after the angle is adjusted to the correct position, lock the corner reflector base and fasteners to complete the high-precision anti-interference deployment.

[0143] Step S305 above includes:

[0144] Step S3051: Use the direction of the local entity baseline as the zero-degree reference axis.

[0145] In step S3052, if the azimuth difference is positive, the corner reflector is controlled to rotate clockwise horizontally relative to the zero-degree reference axis by the azimuth difference; if the azimuth difference is negative, the corner reflector is controlled to rotate counterclockwise horizontally relative to the zero-degree reference axis by the azimuth difference; if the absolute value of the calculated result is greater than the preset degree, the azimuth difference is normalized to the preset degree range, and the direction with the shortest rotation path is selected for operation.

[0146] Specifically, this embodiment uses a measurement coordinate system defined with clockwise as positive. In particular, the definition... During on-site deployment, the direction of the local entity baseline P1P2 (i.e., the direction from the nearest point P1 to the farthest point P2) is used as the zero-degree reference axis. If... If the value is positive, the operator should control the corner reflector to rotate horizontally clockwise relative to the reference axis; if... If the value is negative, rotate horizontally counterclockwise. If the absolute value of the calculated result is greater than 180 degrees, normalize by adding or subtracting 360 degrees, and select the direction with the shortest rotation path to ensure deployment efficiency and accuracy.

[0147] The directional placement method for corner reflectors provided in this embodiment uses the local physical baseline as the absolute reference axis for intuitive operation rules, and formulates deterministic rotation direction commands and intelligent angle normalization strategies based on the difference sign. This allows on-site personnel to perform rotation operations simply by following clear numerical commands without relying on experience or making complex direction judgments.

[0148] As one or more specific application embodiments of the present invention, the directional deployment method of the corner reflector provided by the present invention will be further described in detail, and the specific process is as follows:

[0149] Step 1: Long Baseline Selection and High-Precision Coordinate Acquisition. First, in an open area surrounding the proposed corner reflector deployment area, select two arbitrary points with good visibility and GNSS signal reception capabilities as measurement reference points, defined as the transmitter point O1 and the far-sight point O2, respectively. Ensure that the line connecting the two points or its extension covers the actual installation location of the corner reflector and meets the requirements of the error circle model verification. Subsequently, use an RTK device to perform coordinate measurements on O1 and O2 respectively. To eliminate single-measurement errors, a multi-epoch continuous observation mode is used at each point to take the average value, thereby obtaining high-precision three-dimensional geodetic coordinates for the two points.

[0150] The error circle model verification includes: the distance between the launch point O1 and the far-view point O2 needs to be calculated based on the accuracy of the RTK measurement equipment and the azimuth angle layout error requirements. In actual measurement, the RTK equipment does not acquire an absolute geometric point, but rather an "error circle" with the true coordinates as the center and the nominal positioning accuracy σ as the radius, such as... Figure 4 As shown, there is an error circle C1 at the emission point O1 with a radius of [missing information]. The emission point O2 has an error circle C2 with a radius of [missing information]. The true azimuth angle of the baseline O1O2 between the launch point O1 and the distant viewpoint O2 lies between the limiting tangents of the two error circles. When the baseline length... When the length is shorter, the relative angle of the error circle is larger, and the azimuth error is greater. Maximum; when the baseline length As the angle increases, the relative angle of the error circle decreases, and the azimuth error... It converged rapidly.

[0151] To meet the design and installation accuracy requirements of the corner reflector, the maximum allowable azimuth error is set as follows: The baseline length must be specified. Set a minimum threshold. Based on plane geometry, determine the maximum error of the azimuth angle under the worst-case scenario (i.e., true north is located at the outermost tangent of the error circle). Satisfies the following trigonometric function relationships:

[0152] (1);

[0153] Take here Because in the worst case, O1 is biased to one side. O2, on the other hand, tends to be concentrated on the other side. The relative errors are superimposed.

[0154] Therefore, the baseline length constraint model is derived as follows:

[0155] (2);

[0156] in, Baseline length; The nominal plane accuracy of the measuring equipment; Set the maximum permissible azimuth angle error for the corner reflector.

[0157] Step 2: Inverse calculation of true north reference azimuth:

[0158] Using the high-precision three-dimensional geodetic coordinates (WGS-84 or CGCS2000 geodetic latitude and longitude coordinates) of points O1 and O2 obtained in step one, the reference azimuth of the baseline O1O2 relative to true north is calculated through coordinate projection transformation, coordinate azimuth calculation, and meridian convergence angle correction. .

[0159] First, the Gauss-Kruger projection or UTM projection (Universal Transverse Mercator) algorithm is used to convert the spherical geodetic coordinates of two points into plane rectangular coordinates, thereby transforming the complex ellipsoidal geometry problem into a plane geometry problem.

[0160] Secondly, calculate the coordinate increments dx and dy of the vector from measurement reference point O1 to measurement reference point O2 on the vertical axis (north) and horizontal axis (east), respectively. Use inverse trigonometric functions to calculate the quadrant angle, and determine the quadrant of the vector based on the sign of the coordinate increment. Solve for the coordinate azimuth angle of the baseline relative to coordinate north. The specific calculation methods are shown in formulas (3) to (5) and Table 1.

[0161] Finally, to eliminate the directional distortion error caused by map projection, a meridian convergence angle correction value is introduced. The meridian convergence angle correction value is calculated using the following formula:

[0162] ;

[0163] in, This is the correction value for the meridian convergence angle. This is the difference between the average longitude between the reference points and the longitude of the central meridian of the projection zone. , To measure the average longitude between reference points, To measure the average dimension between reference points, This represents the longitude of the central meridian of the projection zone.

[0164] Step 3: Visual laser projection and local baseline extraction:

[0165] A laser emitting device is set up at the emission point O1, and its emission center is strictly aligned with the distant viewing point O2 to establish a visual laser beam reference line in space. Then, within the local working area where the corner reflector is actually to be deployed, two auxiliary points P1 and P2 are precisely marked on the ground along the projection path of the laser beam, so as to transmit the long-distance reference orientation without loss and extract it as the local physical reference line P1P2.

[0166] The precise marking methods and principles for auxiliary points P1 and P2 are as follows:

[0167] The specific marking process employs a spot centroid interception and vertical projection method. The operator uses a receiving plate with crosshairs to intercept the laser beam from the emission point O1. After moving the plate to ensure the energy centroid of the laser spot precisely coincides with the center of the crosshairs, the center point is vertically projected onto the ground using a laser alignment device or a physical plumb line, and marked as auxiliary points P1 and P2 respectively.

[0168] Auxiliary points P1 and P2 are distributed on both sides of the proposed installation location of the corner reflector (spanning vertically), so that the local solid baseline connecting P1 and P2 passes directly through the geometric center of the corner reflector, which facilitates the subsequent centering and leveling of the base.

[0169] Step 4: Calculation of target deflection angle:

[0170] Based on the satellite orbit parameters of the InSAR monitoring mission, determine the theoretically required design azimuth angle for the corner reflector to be aligned. Calculate the design azimuth angle With the calculated reference azimuth angle azimuth difference between This difference is the angle that the corner reflector needs to physically rotate relative to the local physical baseline P1P2 when it is deployed.

[0171] Step 5: Place the corner reflector near local auxiliary points P1 and P2. Using angle measuring aids (such as a total station, scale, or angle ruler), with the local physical baseline P1P2 as the zero-degree reference axis, rotate the pointing axis of the corner reflector horizontally as calculated in Step 4. Angle; after the angle is adjusted to the correct position, lock the corner reflector base and fasteners to complete the high-precision anti-interference deployment.

[0172] Specifically, this embodiment uses a measurement coordinate system defined with clockwise as positive. In particular, the definition... During on-site deployment, the direction of the local entity baseline P1P2 (i.e., the direction from the nearest point P1 to the farthest point P2) is used as the zero-degree reference axis. If... If the value is positive, the operator should control the corner reflector to rotate horizontally clockwise relative to the reference axis; if... If the value is negative, rotate horizontally counterclockwise. If the absolute value of the calculated result is greater than 180 degrees, normalize by adding or subtracting 360 degrees, and select the direction with the shortest rotation path to ensure deployment efficiency and accuracy.

[0173] The directional deployment method for corner reflectors provided in this embodiment overcomes the physical bottleneck of relying on geomagnetic orientation in urban strong electromagnetic environments. This invention abandons the reliance on "physical magnetic north" in traditional corner reflector deployment and innovatively employs RTK two-point geometric inverse calculation to construct an absolute benchmark. This significantly reduces the interference of the urban strong electromagnetic environment on the measurement benchmark, transforming uncertain and uncontrollable magnetic field measurements into deterministic and controllable geodetic geometric measurements. It solves the difficulty of accurate orientation in urban strong electromagnetic environments, establishes a quantitative accuracy control standard, and introduces an RTK error circle-baseline length constraint model during corner reflector deployment, quantifying the functional relationship between "baseline length" and "final pointing error."

[0174] This invention effectively reduces the interference of complex urban electromagnetic environments on orientation accuracy. It abandons the traditional magnetic orientation principle and utilizes geodetic coordinates measured by RTK to construct a geometric benchmark. This shift eliminates the influence of paramagnetic or ferromagnetic materials such as steel reinforcement in high-rise buildings, underground high-voltage cables, and communication base stations on the placement of corner reflectors. Compared to the random deviations of several degrees often seen in traditional magnetic compasses in urban areas, this embodiment can still stably obtain an absolute physical benchmark pointing to true north even in extreme electromagnetic environments such as substations and building complexes, achieving high-precision placement of corner reflectors in areas with strong interference.

[0175] This embodiment also provides a directional placement device for a corner reflector, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0176] This embodiment provides a directional placement device for a corner reflector, such as... Figure 5 As shown, it includes:

[0177] The benchmark point and corresponding alignment determination module 501 is used to determine at least two measurement benchmark points in the area where the corner reflector is to be deployed, and to obtain the geodetic coordinates of each measurement benchmark point.

[0178] The reference azimuth calculation module 502 is used to calculate the reference azimuth angle between the measurement reference points relative to the true north direction based on the geodetic coordinates of the measurement reference points.

[0179] The local entity baseline determination module 503 is used to mark at least two auxiliary points in the proposed area of ​​the corner reflector based on the reference azimuth angle, and to determine the local entity baseline based on the at least two auxiliary points.

[0180] The azimuth difference calculation module 504 is used to obtain the design azimuth of the corner reflector and calculate the azimuth difference between the design azimuth and the reference azimuth.

[0181] The corner reflector orientation module 505 is used to orient the corner reflector based on the azimuth difference, with the local entity baseline as a reference.

[0182] In some optional implementations, the benchmark point and corresponding alignment determination module 501 includes:

[0183] The measurement reference point selection unit is used to select at least two arbitrary points with a line of sight as measurement reference points in the area where the corner reflector is to be deployed.

[0184] The geodetic coordinate calculation unit performs three-dimensional coordinate measurements on each measurement reference point and calculates the average value of the coordinate measurements using a multi-epoch continuous observation mode to obtain the geodetic coordinates of each measurement reference point.

[0185] In some optional implementations, the benchmark point and corresponding alignment determination module 501 further includes:

[0186] The error circle model verification unit is used to cover the actual installation position of the corner reflector by the line or extension of at least two measurement reference points, and satisfies the error circle model verification; the error circle model verification is achieved using the following constraints:

[0187] ;

[0188] in, Baseline length; The nominal plane accuracy of the measuring equipment; Set the maximum permissible azimuth angle error for the corner reflector.

[0189] In some optional implementations, the reference azimuth angle calculation module 502 includes:

[0190] The coordinate transformation unit is used to convert the geodetic coordinates of the measurement reference point into plane rectangular coordinates.

[0191] The coordinate azimuth calculation unit is used to calculate the coordinate azimuth of the baseline between measurement reference points relative to coordinate north, based on plane rectangular coordinates.

[0192] The correction value calculation unit is used to calculate the correction value of the meridian convergence angle.

[0193] The correction unit is used to correct the coordinate azimuth angle according to the meridian convergence angle correction value, so as to obtain the reference azimuth angle of the baseline between the measurement reference points relative to the true north direction.

[0194] In some alternative implementations, the meridian convergence angle correction value is calculated using the following formula:

[0195] ;

[0196] in, This is the correction value for the meridian convergence angle. This is the difference between the average longitude between the reference points and the longitude of the central meridian of the projection zone. , To measure the average longitude between reference points, To measure the average dimension between reference points, This represents the longitude of the central meridian of the projection zone.

[0197] In some alternative implementations, the local entity baseline determination module 503 includes:

[0198] The laser reference line acquisition unit is used to emit a laser beam from one of the measurement reference points to another, with the reference azimuth angle as the reference, to obtain the laser reference line between the measurement reference points.

[0199] The local entity baseline acquisition unit is used to mark two auxiliary points in the proposed placement area of ​​the corner reflector by using laser spot centroid interception and vertical projection along the projection path of the laser baseline. The local entity baseline is determined based on the two auxiliary points, which are distributed on both sides of the proposed placement position of the corner reflector. The local entity baseline passes through the geometric center of the corner reflector.

[0200] In some optional implementations, the azimuth difference calculation module 504 includes:

[0201] The azimuth angle determination unit is designed to determine the theoretically required azimuth angle of the corner reflector based on the satellite orbit parameters of the InSAR monitoring mission.

[0202] The azimuth difference calculation unit is used to calculate the azimuth difference between the design azimuth and the reference azimuth. The azimuth difference is the angle value that the corner reflector needs to physically rotate relative to the local physical baseline when it is deployed.

[0203] In some alternative implementations, the corner reflector orientation module 505 includes:

[0204] The zero-degree reference axis determination unit is used to determine the zero-degree reference axis by using the direction of the local entity baseline.

[0205] The on-site deployment unit is used to control the corner reflector to rotate clockwise horizontally relative to the zero-degree reference axis when the azimuth difference is positive; and to control the corner reflector to rotate counterclockwise horizontally relative to the zero-degree reference axis when the azimuth difference is negative. If the absolute value of the calculated result is greater than a preset degree, the azimuth difference is normalized to a preset degree range, and the direction with the shortest rotation path is selected for operation.

[0206] The directional placement device for corner reflectors provided in this embodiment of the invention can execute the directional placement method for corner reflectors provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0207] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0208] The following is a detailed reference. Figure 6 This diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 602 or a program loaded from memory 608 into random access memory (RAM) 603. The RAM 603 also stores various programs and data required for the operation of the electronic device. The processor 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0209] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 607 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 608 including, for example, magnetic tapes, hard disks, etc.; and communication devices 609. Communication device 609 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0210] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 609, or installed from a memory 608, or installed from a ROM 602. When the computer program is executed by the processor 601, it performs the functions defined in the directional placement method of the corner reflector according to embodiments of the present invention.

[0211] Figure 6 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0212] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the directional placement method of the corner reflector shown in the above embodiments is implemented.

[0213] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0214] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method of directional deployment of corner reflectors, characterized in that, The method includes: Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point; Determine at least two measurement reference points in the area where the corner reflector is to be deployed, and obtain the geodetic coordinates of each measurement reference point, including: In the area where the corner reflector is to be installed, select at least two arbitrary points with a line of sight as measurement reference points; Three-dimensional coordinate measurements were performed on each measurement benchmark point, and the average value of the coordinate measurements was calculated using a multi-epoch continuous observation mode to obtain the geodetic coordinates of each measurement benchmark point. Based on the geodetic coordinates of the measurement reference points, calculate the reference azimuth angle of the baseline between the measurement reference points relative to true north. The calculation of the reference azimuth angle between the measurement reference points relative to true north, based on the geodetic coordinates of the measurement reference points, includes: Convert the geodetic coordinates of the measurement reference point into plane rectangular coordinates; Calculate the coordinate azimuth angle of the baseline between the measurement reference points relative to coordinate north, based on the plane rectangular coordinate system. Calculate the meridian convergence angle correction value; The coordinate azimuth is corrected based on the meridian convergence angle correction value to obtain the reference azimuth between the measurement reference points relative to the true north direction. Determining at least two measurement reference points in the proposed area for the corner reflector deployment also includes: The line connecting at least two measurement reference points or their extensions must cover the actual installation location of the corner reflector and satisfy the error circle model verification; the error circle model verification is achieved using the following constraints: ； wherein, is the baseline length; is the nominal planar accuracy of the measuring device; is the maximum azimuthal error allowed for the corner reflector layout; Using the reference azimuth as a reference, mark at least two auxiliary points in the area where the corner reflector is to be deployed, and determine the local entity baseline based on the at least two auxiliary points; Obtain the design azimuth angle of the corner reflector, and calculate the azimuth angle difference between the design azimuth angle and the reference azimuth angle; Using the local entity baseline as a reference, the corner reflectors are oriented and deployed according to the azimuth difference.

2. The method of claim 1, wherein, The meridian convergence angle correction value is calculated using the following formula: ； in, This is the correction value for the meridian convergence angle. The difference between the average longitude between the reference points and the longitude of the central meridian of the projection zone is used to measure the distance between the reference points. , To measure the average longitude between reference points, To measure the average dimension between reference points, This represents the longitude of the central meridian of the projection zone.

3. The method according to claim 1, characterized in that, The step of marking at least two auxiliary points in the proposed area for the corner reflector, using the reference azimuth angle as a reference, and determining the local entity baseline based on the at least two auxiliary points, includes: Using the reference azimuth angle as a reference, a laser beam is emitted from one of the measurement reference points to another measurement reference point to obtain a laser reference line between the measurement reference points; Along the projection path of the laser reference line, two auxiliary points are marked in the proposed placement area of ​​the corner reflector using the laser spot centroid interception and vertical projection method. The local entity reference line is determined based on the two auxiliary points. The two auxiliary points are distributed on both sides of the proposed placement position of the corner reflector, and the local entity reference line passes through the geometric center of the corner reflector.

4. The method according to claim 1, characterized in that, The process of obtaining the design azimuth angle of the corner reflector and calculating the azimuth angle difference between the design azimuth angle and the reference azimuth angle includes: Based on the satellite orbit parameters of the InSAR monitoring mission, determine the theoretically required design azimuth angle for the corner reflector to be aligned. Calculate the azimuth difference between the design azimuth and the reference azimuth, where the azimuth difference is the angle by which the corner reflector needs to be physically rotated relative to the local physical baseline during deployment.

5. The method according to claim 1, characterized in that, Using the local entity baseline as a reference, the directional placement of the corner reflectors is performed based on the azimuth difference, including: The direction of the local entity baseline is used as the zero-degree reference axis; If the azimuth difference is positive, the control corner reflector rotates clockwise horizontally relative to the zero-degree reference axis by the azimuth difference value. If the azimuth difference is negative, the control corner reflector will rotate counterclockwise horizontally relative to the zero-degree reference axis by the azimuth difference. If the absolute value of the calculated result is greater than the preset degree, the azimuth difference value will be normalized to the preset degree range, and the direction with the shortest rotation path will be selected for operation.

6. A directional placement device for a corner reflector, characterized in that, The device includes: The benchmark point and corresponding alignment determination module is used to determine at least two measurement benchmark points in the area where the corner reflector is to be deployed, and to obtain the geodetic coordinates of each measurement benchmark point; The benchmark point and corresponding alignment determination module includes: a measurement benchmark point selection unit, used to select at least two arbitrary points with a line of sight as measurement benchmark points in the area where the corner reflector is to be deployed; The geodetic coordinate calculation unit performs three-dimensional coordinate measurements on each measurement reference point and calculates the average value of the coordinate measurements using a multi-epoch continuous observation mode to obtain the geodetic coordinates of each measurement reference point. The reference azimuth calculation module is used to calculate the reference azimuth angle between measurement reference points relative to true north, based on the geodetic coordinates of the measurement reference points. The reference azimuth calculation module includes: a coordinate transformation unit, used to convert the geodetic coordinates of the measurement reference point into plane rectangular coordinates; The coordinate azimuth calculation unit is used to calculate the coordinate azimuth of the baseline between measurement reference points relative to coordinate north, based on plane rectangular coordinates. The correction value calculation unit is used to calculate the meridian convergence angle correction value; The correction unit is used to correct the coordinate azimuth angle according to the meridian convergence angle correction value, so as to obtain the reference azimuth angle of the baseline between the measurement reference points relative to the true north direction. Determining at least two measurement reference points in the proposed area for the corner reflector deployment also includes: The line connecting at least two measurement reference points or their extensions must cover the actual installation location of the corner reflector and satisfy the error circle model verification; the error circle model verification is achieved using the following constraints: ； in, Baseline length; The nominal plane accuracy of the measuring equipment; Set the maximum permissible azimuth angle error for the corner reflector layout; The local entity baseline determination module is used to mark at least two auxiliary points in the proposed area of ​​the corner reflector based on the reference azimuth angle, and determine the local entity baseline based on the at least two auxiliary points. The azimuth difference calculation module is used to obtain the design azimuth of the corner reflector and calculate the azimuth difference between the design azimuth and the reference azimuth. The corner reflector orientation module is used to orient the corner reflector according to the azimuth difference, with the local entity baseline as a reference.

7. An electronic device, characterized in that, include: The device includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the directional placement method of the corner reflector as described in any one of claims 1 to 5.

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