On-orbit antenna deflection angle measuring method and system based on two-dimensional PSD

Abstract

The invention provides an on-orbit antenna deflection angle measuring method and system based on a two-dimensional PSD. The method comprises the steps that the two-dimensional PSD is installed on the surface or a frame of an on-orbit antenna; the two-dimensional PSD generates a first measurement point as an initial scanning line position coordinate through laser scanning; the in-orbit antenna deflects, the position of the initial scanning line changes, and an nth measurement point is obtained; n is the number of the measuring points; and the variable quantity between the measuring points is collected, the deflection angle of the antenna is calculated and obtained, and monitoring of the deflection angle of the on-orbit antenna is achieved. According to the invention, the measurement range can cover the unfolding array plane of the SAR antenna and the whole SAR antenna, the measurement of the whole deflection angle is realized, various deflection angles can be distinguished, and the method is accurate and reliable; specifically, an automatic telemetering system is constructed, and real-time information acquisition is realized.

Description

Technical Field

[0001] The present invention belongs to the field of industrial measurement technology, and in particular relates to a method and system for measuring the deflection angle of an on-orbit antenna based on a two-dimensional PSD. Background Art

[0002] SAR antennas are a common satellite antenna structure, widely used in fields such as meteorological observation, topographic mapping, and electronic communications. SAR antennas are typically composed of multiple antenna sub-boards. The deflection angle of the sub-boards and the entire antenna are key SAR antenna specifications, affecting antenna gain, imaging resolution, and beam pointing accuracy. Therefore, accurate monitoring and calculation of antenna directivity is essential and crucial for the development of high-performance satellites.

[0003] Laser measurement, with its wide range, high speed, and high accuracy, is often used to measure the directivity and deflection angles of on-orbit SAR antennas. However, the measurement system is generally quite complex. Calculating deflection angles based on two-dimensional PSD is more complex than calculating it based on one-dimensional PSD, and data processing and calculation methods are still unclear.

[0004] Therefore, there is an urgent need for an accurate and reliable method to calculate the deflection angle of on-orbit SAR antennas.

[0005] Patent document CN116743972A discloses an angle measurement method and system based on array laser ranging. This solution calculates the average point from the depth data frame acquired by the laser, obtains the average point angle, and obtains the deflection angle value by comparing the difference before and after the deflection. This method cannot accurately distinguish between deflection and displacement in complex motion situations.

[0006] Patent document CN115236640A discloses a method for measuring the angle of a laser radar scanning device. This method uses the echo signal reflected by the target to obtain distance information or three-dimensional imaging, achieving highly accurate angle measurement of the scanning mirror. However, this method has a limited measurement range and cannot cover large in-orbit antennas.

[0007] Patent document CN115808150A discloses a method for detecting surface deflection angles based on binocular recognition angle measurement. This solution determines the deflection angle of the target surface by matching the spatial coordinates of two reference surfaces. This method requires two cameras to form a binocular recognition system, resulting in a relatively complex measurement system structure.

[0008] Patent document CN114812445A discloses a method for measuring the deflection angle of a plane using a dual-cavity interferometer. This solution uses interference between reflected laser light and the end-reflected light from dual optical fibers to achieve non-contact deflection angle measurement of planar materials. However, this method has a limited measurement space and is only suitable for measuring deflection on a localized surface of a component.

[0009] Patent document CN112729221A discloses a method for measuring the deflection angle of an aircraft rudder. This method uses photogrammetry to collect the spatial coordinates of markers attached to the rudder and other parts, and calculates the rudder deflection angle value based on geometric relationships. This method requires the collection of coordinate information of each part and is not suitable for fully automatic real-time measurement systems.

[0010] Patent document CN119413106A discloses a method and system for measuring the flatness of an on-orbit antenna based on a two-dimensional PSD. This solution deploys a two-dimensional PSD and a surface scanning laser on the satellite antenna and satellite body. The surface scanning laser scans the two-dimensional PSD. Supports of varying heights are set based on the angle between the laser scanning line and the photosensitive surface. When the antenna is displaced or deflected, the laser scanning trajectory on the photosensitive surface changes. At this point, the PSD output is collected, and the offset or deflection of a single antenna measurement point is calculated to determine the flatness of that single measurement point. Combining the offset and flatness values of multiple measurement points, the overall antenna flatness value is calculated, enabling real-time monitoring of on-orbit antenna flatness. This solution merely provides a method for calculating antenna flatness, but fails to provide a specific and clear relationship between the change in the laser scanning line on the two-dimensional PSD surface and the deflection of the antenna plane. This makes it impossible to analyze complex antenna rotations.

[0011] This problem needs to be solved urgently. Summary of the Invention

[0012] In view of the defects in the prior art, the object of the present invention is to provide a method and system for measuring the deflection angle of an on-orbit antenna based on a two-dimensional PSD.

[0013] According to the present invention, a method for measuring the deflection angle of an on-orbit antenna based on a two-dimensional PSD is provided, comprising: a two-dimensional PSD mounted on a surface or a frame of the on-orbit antenna;

[0014] The two-dimensional PSD is laser scanned to generate a first measurement point as the initial scan line position coordinate; the on-orbit antenna is deflected, the initial scan line position changes, and the nth measurement point is obtained, where n is the number of measurement points;

[0015] The changes between measurement points are collected, the deflection angle of the antenna is calculated and obtained, and the deflection angle of the on-orbit antenna is monitored.

[0016] Preferably, the two-dimensional PSD comprises a photosensitive surface (1);

[0017] Laser scanning the photosensitive surface (1) of the two-dimensional PSD, with the angle between the incident light and the photosensitive surface being 20° to 80°;

[0018] The number of the incident light rays is 1 to 6, wherein when the number of the incident light rays is greater than 1, the multiple incident light rays are parallel to each other.

[0019] Preferably, the two-dimensional PSD includes a signal processing unit (4); the signal processing unit (4) is connected to the photosensitive surface (1) of the two-dimensional PSD; the photosensitive surface (1) is scanned by laser, and the two-dimensional PSD can output current to the signal processing unit (4);

[0020] The signal processing unit (4) obtains the X-direction coordinate value and the Y-direction coordinate value of the incident light in the PSD photosensitive surface according to the output current;

[0021] The mathematical expressions of the X-direction coordinate values are:

[0022]

[0023] Where X represents the X-direction coordinate value of the laser scanning line; the symbol · represents multiplication;

[0024] The mathematical expressions of the Y-direction coordinate values are:

[0025]

[0026] Wherein, Y represents the Y-direction coordinate value of the laser scanning line; L is the side length of the photosensitive surface (1) of the two-dimensional PSD; I1 to I4 respectively represent the first output current value, the second output current value, the third output current value and the fourth output current value of the two-dimensional PSD output current.

[0027] Preferably, the on-orbit antenna is deflected along the X-axis, and the mathematical expression of the deflection angle is:

[0028]

[0029] Where β represents the deflection angle; represents the angle between the incident light and the photosensitive surface (1) after deflection; θ represents the initial angle between the incident light and the photosensitive surface (1) before deflection;

[0030] described The mathematical expression is:

[0031]

[0032] Among them, L y With L y ′ respectively represent the distance between the intersection point of the incident light on the Y axis and the origin when the initial scan line position is set, and the distance between the intersection point of the incident light on the Y axis and the origin after the initial scan line position is changed;

[0033] When the on-orbit antenna deflects clockwise along the X-axis, the mathematical expression for the flatness change is:

[0034] Δz=L′ y sinβ

[0035] Wherein, Δz represents the plane variation.

[0036] Preferably, the on-orbit antenna is deflected along the Y-axis, and the mathematical expression of the deflection angle is Formula 1:

[0037]

[0038] Where α represents the deflection angle of the on-orbit antenna along the Y axis; ω represents the angle between the incident light before and after deflection;

[0039] When the on-orbit antenna deflects along the Y axis, the mathematical expression of the plane change caused is:

[0040] Δz=L′·sinω·tanθ

[0041] Where Δz represents the plane variation.

[0042] Preferably, when the on-orbit antenna deflects clockwise along the X-axis and the Y-axis simultaneously, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 1; the deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 2:

[0043]

[0044] Where β represents the deflection angle of the on-orbit antenna along the X-axis;

[0045] When the on-orbit antenna deflects clockwise along the X-axis and the Y-axis simultaneously, the mathematical expression of the plane change caused is:

[0046] Δz=L′ y ·sinβ+L′·sinω·tanθ

[0047] When the on-orbit antenna deflects clockwise along the X-axis and counterclockwise along the Y-axis, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 3:

[0048]

[0049] The deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 2.

[0050] When the on-orbit antenna deflects counterclockwise along the X-axis and clockwise along the Y-axis, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 1; the deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 4:

[0051]

[0052] When the on-orbit antenna is deflected counterclockwise along the X-axis and the Y-axis simultaneously, the mathematical expression of the deflection angle of the on-orbit antenna along the Y-axis is Formula 3, and the mathematical expression of the deflection angle of the on-orbit antenna along the X-axis is Formula 2.

[0053] According to the two-dimensional PSD-based on-orbit antenna deflection angle measurement method provided by the present invention, an on-orbit antenna deflection angle measurement system based on the two-dimensional PSD is realized.

[0054] Preferably, it includes:

[0055] Step A1: Laser scan the 2D PSD to generate the first measurement point as the initial scan line position coordinate;

[0056] Step A2: deflecting the on-orbit antenna, changing the position of the initial scanning line, and obtaining the nth measurement point, where n is the number of measurement points;

[0057] Step A3: Collect the changes between the measurement points, calculate and obtain the deflection angle of the antenna, and monitor the deflection angle of the on-orbit antenna.

[0058] According to a computer-readable storage medium storing a computer program provided by the present invention, when the computer program is executed by a processor, the steps of a method for measuring the deflection angle of an on-orbit antenna based on two-dimensional PSD are implemented.

[0059] According to the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of a method for measuring the deflection angle of an on-orbit antenna based on two-dimensional PSD are implemented.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] 1. The calculation accuracy of the present invention is high. Based on the relationship between geometric analysis and trigonometric functions, the error of the calculated antenna flatness is small and the reliability is high.

[0062] 2. The system complexity of the present invention is low, and the measurement conditions can be met by relying on laser scanning of the two-dimensional PSD, and the amount of data calculation is small; in other words, the calculation method of the present invention only relies on the output value of the two-dimensional PSD, reducing the complexity of the deflection angle measurement system.

[0063] 3. The output state of the present invention is diversified. Through a single two-dimensional PSD, the deflection angles of the antenna in different states can be output, thus realizing diversified output of a single module.

[0064] 4. The calculation method of the antenna deflection angle provided by the present invention has the characteristics of small data volume and high accuracy. It can realize the output of diversified antenna deflection angles with a single module, effectively simplifying the measurement system structure.

[0065] 5. The measurement range of the present invention can cover the SAR antenna array and the entire SAR antenna, realize the measurement of the overall deflection angle, and can distinguish multiple deflection angles accurately and reliably; specifically, an automatic telemetry system is constructed to realize real-time information collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0067] Figure 1 Schematic diagram of the structural composition of the two-dimensional PSD provided by the present invention;

[0068] Figure 2 A schematic diagram showing the change of the laser scanning line on the photosensitive surface when the antenna provided by the present invention is deflected clockwise along the X-axis;

[0069] Figure 3 A schematic diagram showing the change of the laser scanning line on the photosensitive surface when the antenna provided by the present invention is deflected clockwise along the Y axis;

[0070] Figure 4 A schematic diagram showing the change of the laser scanning line on the photosensitive surface when the antenna provided by the present invention is deflected along the X-axis and the Y-axis simultaneously;

[0071] Figure 5 This is a flow chart of analyzing the position change of the laser scan line and judging the antenna deflection based on the two-dimensional PSD output provided by the present invention. DETAILED DESCRIPTION

[0072] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0073] The invention is based on clear geometric analysis and trigonometric function formulas, and calculates the deflection angles of the antenna in different states through the output data of the two-dimensional PSD. It has the characteristics of small data volume, simplified structure and high accuracy.

[0074] The key to the improvement of the present invention is that, through geometric analysis, a specific and clear calculation formula is given between the change in the laser scanning line on the two-dimensional PSD surface and the deflection of the antenna plane. This includes the calculation method for the antenna deflection angle β along the X-axis, the deflection angle α along the Y-axis, and the simultaneous deflection along the X and Y axes. It can be used to analyze the situation of single-axis deflection or complex dual-axis rotation of the antenna.

[0075] In embodiment 1, a method for measuring the deflection angle of an on-orbit antenna based on a two-dimensional PSD is provided according to the present invention, comprising:

[0076] Step 1: The 2D PSD is placed on the satellite antenna, and the 2D PSD photosensitive surface 1 is scanned by a surface scanning laser to form a laser scanning line 2;

[0077] Step 2: Calculate the position coordinates of the laser scan line 2 using the two-dimensional PSD output value 3; the laser scan line is referred to as the scan line for short;

[0078] Step 3: The incident light and the photosensitive surface have a certain initial angle 9. When the antenna deflects, the laser scanning line 2 changes from the initial position 5 to the position 6.

[0079] Step 4: Based on the three-dimensional geometric model and trigonometric function relationship, the antenna deflection angle 7 is calculated by the position change of the scan line;

[0080] Step 5: Obtain the antenna deflection angle value through a single measurement point to achieve real-time monitoring of the on-orbit antenna deflection angle.

[0081] Specifically, the two-dimensional PSD is arranged on the antenna surface or frame, and has a plurality of parallel laser scanning lines 2 on its photosensitive surface 1 .

[0082] Specifically, the position of the laser scanning line 2 can be calculated through the two-dimensional PSD output value 3, and the incident light of the scanning line has a certain initial angle 9 with the photosensitive surface.

[0083] Specifically, after the antenna is deflected, the laser scanning line 2 changes from the initial position 5 to the position 6.

[0084] Specifically, based on the position change, and the initial angle 9 and the changed angle 8 between the incident light of the scanning line 2 and the photosensitive surface 1 , the antenna deflection angle 7 is calculated.

[0085] Specifically, when the antenna is deflected clockwise along the X-axis, the antenna deflection angle 7 is calculated as follows:

[0086]

[0087] Where β is the deflection angle of the antenna along the X axis, is the angle 8 between the incident light and the photosensitive surface after deflection, taking the acute angle, θ is the initial angle 9, L y and L′ y is the distance between the intersection of the Y axis and the origin before and after the change of the laser scanning line 2. The flatness change Δz caused by the deflection can be expressed as:

[0088] Δz=L′ y sinβ

[0089] Specifically, when the antenna is deflected counterclockwise along the X-axis, the antenna deflection angle 7 is calculated as follows:

[0090]

[0091] Specifically, when the antenna is deflected along the Y-axis, the mathematical expression of the antenna deflection angle 7 is formula (1):

[0092]

[0093] Where α is the deflection angle of the antenna along the Y axis, ω is the angle between the changed scan line and the original scan line, L is the length of the original scan line, and L' is the length of the scan line after deflection. Based on the deflection angle, the flatness change caused by the deflection can be calculated as:

[0094] Δz=L′·sinω·tanθ

[0095] Specifically, in the case where the antenna is deflected along the X-axis and the Y-axis simultaneously, the calculation method of the antenna deflection angle 7 is the superposition of the single-axis deflection angle calculation formulas.

[0096] In other words, a real-time measurement method of the deflection angle of an on-orbit satellite antenna provided by the present invention includes:

[0097] Step 1: Mount a two-dimensional PSD on the antenna surface or frame, with the incident light of the surface scanning laser forming a certain angle with the PSD photosensitive surface; the antenna is an on-orbit antenna;

[0098] Step 2: Form several parallel laser scanning lines on the two-dimensional PSD photosensitive surface, and calculate the position information of the scanning lines through the output current;

[0099] Step 3: After the antenna is deflected, the position of the scanning line on the photosensitive surface changes. The deflection angle of the antenna is calculated based on the position change, realizing real-time measurement of the deflection angle.

[0100] The number of laser scanning lines on the two-dimensional PSD photosensitive surface is 1 to 6, and the antenna deflection angle is smaller than the angle between the incident light and the photosensitive surface.

[0101] Example 2: Figure 1As shown in the figure, the structure consists of a two-dimensional PSD photosensitive surface 1, a laser scanning line 2, a two-dimensional PSD output current 3, and a signal processing unit 4. The PSD photosensitive surface 1 is fixed on the antenna surface or frame. The output current 3 is processed by the signal processing unit 4 to obtain the position change of the laser scanning line 2. The serial numbers can be represented by ①, ②, and ③, and the deflection angle of the antenna is then calculated.

[0102] Among them, the laser scanning line 2, that is, the number of incident light rays is 1 to 6, and the two-dimensional PSD output current is 4 in total.

[0103] The output current 3 is collected and analyzed by the signal processing unit 4 to obtain the X-direction coordinate value and the Y-direction coordinate value of the laser scanning line 2;

[0104] The mathematical expressions of the X-direction coordinate values are:

[0105]

[0106] Where X represents the X-direction coordinate value of the laser scanning line; the symbol · represents multiplication;

[0107] The mathematical expressions of the Y-direction coordinate values are:

[0108]

[0109] Wherein, Y represents the Y-direction coordinate value of the laser scanning line; L is the side length of the two-dimensional PSD photosensitive surface 1; I1 to I4 are the first output current value, second output current value, third output current value and fourth output current value of the four channels respectively.

[0110] Specifically, the coordinate value is the coordinate of the incident light, which can be calculated by the outputs I1 to I4 of the two-dimensional PSD. This value, combined with the PSD outputs I1 to I4, can reflect the change in the incident angle of the light.

[0111] Figure 2 Schematic diagram of the change of the laser scanning line when the antenna is deflected clockwise along the X-axis.

[0112] In the initial state of the antenna, there is an initial angle 9 between the laser light and the PSD photosensitive surface 1, forming a laser position 5. When the antenna is deflected clockwise along the X-axis, the two-dimensional PSD produces a deflection angle 7, the laser spot changes to position 6, and the angle between the photosensitive surface and the incident laser changes to angle 8. At this time, the position of the laser scan line 2 changes. The scan line in the positive Y-axis region shifts toward the negative Y-axis direction, while the scan line in the negative Y-axis region shifts toward the positive Y-axis direction. The overall appearance is that the spacing between parallel scan lines decreases.

[0113] Based on the displacement of the laser scanning line 2 and the trigonometric function relationship, the mathematical expression of the deflection angle β is:

[0114]

[0115] Wherein, θ is the initial angle 9 between the laser scanning line 2 and the original photosensitive surface 1, is the angle 8 (acute angle) between the laser scanning line and the deflected photosensitive surface 1, L y and L y ′ is the distance between the intersection of the Y axis and the origin before and after the scan line changes, that is, L y and L y The value of ′ is equal to the absolute value of the Y-axis coordinate value before and after the laser scanning line changes.

[0116] The relationship between the coordinate value and the distance of the scan line change, that is, when the antenna is deflected along the X-axis, the scan line translates within the photosensitive surface, and its translation distance along the Y-axis direction is equal to the change in the Y-coordinate value of the laser scan line, that is, the change in the Y coordinate is equal to the displacement distance of the scan line, and there is no need to define it through a formula.

[0117] The flatness change Δz caused by deflection is expressed mathematically as:

[0118] Δz=L′ y sinβ

[0119] When the antenna deflects counterclockwise along the X-axis, the scan lines in the positive Y-axis region on the PSD photosensitive surface 1 translate toward the positive Y-axis, while the scan lines in the negative Y-axis region translate toward the negative Y-axis. Overall, the spacing between the laser scan lines 2 increases. Similarly, based on the displacement of the laser scan lines on the two-dimensional PSD photosensitive surface and the relationship between trigonometric functions, the calculation formula for the deflection angle β is:

[0120]

[0121] Figure 3 Figure 1 shows the change in the laser scan line when the antenna is deflected clockwise along the Y axis. At this point, the angle ω between the scan line and its original position is 10°. The scan line can be divided into two parts: the left half moves downward, and the Y coordinate decreases gradually, becoming smaller as it approaches the edge. The right half moves upward, and the Y coordinate increases gradually, becoming larger as it approaches the edge.

[0122] Based on the three-dimensional geometric model and trigonometric function relationship, the mathematical expression of the deflection angle α of the two-dimensional PSD is formula 1:

[0123]

[0124] Wherein, L is the length of the original scanning path, and L′ is the length of the scanning line after deflection.

[0125] Based on the deflection angle, the flatness change caused by the deflection can be calculated as:

[0126] Δz=L′·sinω·tanθ

[0127] When the antenna is deflected counterclockwise along the Y-axis, the calculation method of its deflection angle is the same as above.

[0128] Figure 4 The scanning path changes when the antenna is deflected along the X-axis and Y-axis at the same time.

[0129] When the antenna is deflected clockwise along the X-axis and Y-axis simultaneously, as shown in Figure 4 (a) As shown in case 1, scan lines ① and ③ approach scan line ②, and the three scan lines tilt synchronously, showing a phenomenon in which the Y coordinate on the left decreases and the Y coordinate on the right increases. The angle between the tilted scan line and the original scan line is ω. At this time, the mathematical expression of the antenna, that is, the on-orbit antenna, along the Y axis deflection angle α is as follows:

[0130]

[0131] The mathematical expression of the deflection angle β of the on-orbit antenna along the X-axis is as follows:

[0132]

[0133] Δz=L′ y ·sinβ+L′·sinω·tanθ

[0134] When the antenna is deflected clockwise along the X axis and counterclockwise along the Y axis, Figure 4 (b) As shown in case 2, scan lines ① and ③ approach ②, and the three scan lines tilt synchronously, showing a phenomenon in which the Y coordinate increases on the left and decreases on the right. Define the angle as positive when deflecting clockwise and negative when deflecting counterclockwise. The calculation method for the antenna deflection angle β along the X axis is the same as case 1. The mathematical expression for the deflection angle α along the Y axis is formula 3:

[0135]

[0136] When the antenna is deflected counterclockwise along the X axis and clockwise along the Y axis, Figure 4 (c) As shown in case 3, scan lines ① and ③ move away from ②. The three scan lines tilt synchronously, showing a phenomenon in which the Y coordinate decreases on the left and increases on the right. The calculation method for the antenna deflection angle α along the Y axis is the same as that of case 1. The mathematical expression for the deflection angle β along the X axis is formula 4:

[0137]

[0138] When the antenna is deflected counterclockwise along the X and Y axes simultaneously, as shown in Figure 4 (d) As shown in case 4, scan lines ① and ③ move away from scan line ②, and the three scan lines tilt synchronously, showing an increase in the Y coordinate on the left and a decrease in the Y coordinate on the right. The method for expressing the antenna deflection angle α along the Y axis is the same as in case 2, and the method for expressing the deflection angle β along the X axis is the same as in case 3.

[0139] Figure 5 The figure below is a flow chart for analyzing laser scan line position changes based on 2D PSD output. Based on the above calculation method, the antenna deflection can be determined based on the characteristics of the laser scan line position changes. If the laser scan line only shifts or deflects, it is a case of single-axis antenna deflection. Depending on the specific changes in the scan line, it can be determined to be an X-axis or Y-axis deflection. If the laser scan line shifts and deflects simultaneously, it is a case of dual-axis antenna rotation. Using the calculation formula, the X-axis and Y-axis deflection angles for the four single-axis deflection or four dual-axis rotation scenarios can be obtained, thus achieving the goal of outputting the antenna deflection angle at a single measurement point and simplifying the measurement system structure.

[0140] Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, and units provided by the present invention in purely computer-readable program code, it is entirely possible to implement the same functions of the system and its various devices, modules, and units provided by the present invention in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; the devices, modules, and units for implementing various functions can also be considered as both software modules implementing the method and structures within the hardware component.

[0141] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0142] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. An on-orbit antenna deflection angle measurement system based on two-dimensional PSD, characterized in that: include: a two-dimensional PSD mounted on the surface or frame of the on-orbit antenna; The two-dimensional PSD is laser scanned to generate a first measurement point as the initial scan line position coordinate; The on-orbit antenna is deflected, and the position of the initial scanning line changes to obtain the nth measurement point, where n is the number of measurement points; The changes between measurement points are collected, the deflection angle of the antenna is calculated and obtained, and the deflection angle of the on-orbit antenna is monitored.

2. The on-orbit antenna deflection angle measurement system based on two-dimensional PSD according to claim 1, characterized in that: The two-dimensional PSD comprises a photosensitive surface (1); Laser scanning the photosensitive surface (1) of the two-dimensional PSD, with the angle between the incident light and the photosensitive surface being 20° to 80°; The number of the incident light rays is 1 to 6, wherein when the number of the incident light rays is greater than 1, the multiple incident light rays are parallel to each other.

3. The on-orbit antenna deflection angle measurement system based on two-dimensional PSD according to claim 2, characterized in that: The two-dimensional PSD includes a signal processing unit (4); the signal processing unit (4) is connected to the photosensitive surface (1) of the two-dimensional PSD; the photosensitive surface (1) is scanned by laser, and the two-dimensional PSD can output current to the signal processing unit (4); The signal processing unit (4) obtains the X-direction coordinate value and the Y-direction coordinate value of the incident light in the PSD photosensitive surface according to the output current; The mathematical expressions of the X-direction coordinate values are: Where X represents the X-direction coordinate value of the laser scanning line; the symbol · represents multiplication; The mathematical expressions of the Y-direction coordinate values are: Wherein, Y represents the Y-direction coordinate value of the laser scanning line; L is the side length of the photosensitive surface (1) of the two-dimensional PSD; I1 to I4 respectively represent the first output current value, the second output current value, the third output current value and the fourth output current value of the two-dimensional PSD output current.

4. The on-orbit antenna deflection angle measurement system of the two-dimensional PSD according to claim 3, characterized in that: The on-orbit antenna deflects along the X-axis, and the mathematical expression of the deflection angle is: Where β represents the deflection angle; represents the angle between the incident light and the photosensitive surface (1) after deflection; θ represents the initial angle between the incident light and the photosensitive surface (1) before deflection; described The mathematical expression is: Among them, L y With L y ′ respectively represent the distance between the intersection point of the incident light on the Y axis and the origin when the initial scan line position is set, and the distance between the intersection point of the incident light on the Y axis and the origin after the initial scan line position is changed; When the on-orbit antenna deflects clockwise along the X-axis, the mathematical expression for the flatness change is: Δz=L′ y sinβ Where Δz represents the plane variation.

5. The on-orbit antenna deflection angle measurement system of the two-dimensional PSD according to claim 1, characterized in that: The on-orbit antenna deflects along the Y-axis, and the mathematical expression of the deflection angle is Formula 1: Where α represents the deflection angle of the on-orbit antenna along the Y axis; ω represents the angle between the incident light before and after deflection; When the on-orbit antenna deflects along the Y axis, the mathematical expression of the plane change caused is: Δz=L′·sinω·tanθ Where Δz represents the plane variation.

6. The on-orbit antenna deflection angle measurement system based on two-dimensional PSD according to claim 1, characterized in that: When the on-orbit antenna deflects clockwise along the X-axis and the Y-axis simultaneously, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 1; the deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 2: Where β represents the deflection angle of the on-orbit antenna along the X-axis; When the on-orbit antenna deflects clockwise along the X-axis and the Y-axis simultaneously, the mathematical expression of the plane change caused is: Δz=L′ y ·sinβ+L′·sinω·tanθ When the on-orbit antenna deflects clockwise along the X-axis and counterclockwise along the Y-axis, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 3: The deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 2. When the on-orbit antenna deflects counterclockwise along the X-axis and clockwise along the Y-axis, the deflection angle of the on-orbit antenna along the Y-axis is expressed as Formula 1; the deflection angle of the on-orbit antenna along the X-axis is expressed as Formula 4: When the on-orbit antenna is deflected counterclockwise along the X-axis and the Y-axis simultaneously, the mathematical expression of the deflection angle of the on-orbit antenna along the Y-axis is Formula 3, and the mathematical expression of the deflection angle of the on-orbit antenna along the X-axis is Formula 2.

7. A method for measuring the deflection angle of an on-orbit antenna based on two-dimensional PSD, characterized in that: The on-orbit antenna deflection angle measurement system based on two-dimensional PSD described in claim 6 is realized.

8. The method for measuring the deflection angle of an on-orbit antenna based on two-dimensional PSD according to claim 7, wherein: include: Step A1: Laser scan the 2D PSD to generate the first measurement point as the initial scan line position coordinate; Step A2: deflecting the on-orbit antenna, changing the position of the initial scanning line, and obtaining the nth measurement point, where n is the number of measurement points; Step A3: Collect the changes between the measurement points, calculate and obtain the deflection angle of the antenna, and monitor the deflection angle of the on-orbit antenna.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the on-orbit antenna deflection angle measurement method based on two-dimensional PSD according to claim 8 are implemented.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is executed by a processor, the steps of the on-orbit antenna deflection angle measurement method based on two-dimensional PSD according to claim 8 are implemented.

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