Method and apparatus for measuring and correcting antenna pointing misalignment and subface follow-up errors

Abstract

The application provides a method and device for measuring and correcting antenna pointing deviation and sub-reflector servo error. The method comprises: obtaining focal plane field data by using a phased array feed placed on an antenna focal plane; determining an antenna aperture field corresponding to the current antenna pointing deviation and sub-reflector servo error according to the focal plane field data; obtaining pointing deviation and sub-reflector servo error information of the current antenna according to the antenna aperture field; and when any one of the pointing deviation value, the sub-reflector axial offset value, the sub-reflector lateral offset value and the sub-reflector tilt value is greater than or equal to the corresponding preset value, performing correction processing according to the pointing deviation and sub-reflector servo error information of the current antenna until the pointing deviation value, the sub-reflector axial offset value, the sub-reflector lateral offset value and the sub-reflector tilt value corresponding to the corrected pointing deviation and sub-reflector servo error information are all less than the corresponding preset value.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more specifically to a method and apparatus for measuring and correcting antenna pointing deviation and sub-plane tracking error. Background Technology

[0002] To improve signal detection sensitivity, radio telescopes are developing towards larger apertures and higher frequencies. Affected by factors such as antenna gravity, wind load, and solar radiation temperature, the pointing of these large radio telescopes can deviate, and the sub-face can become offset, including sub-face position shift and sub-face attitude tilt. To detect pointing deviation and sub-face tracking errors in large radio telescopes, sensors are typically attached to the antenna elevation support or sub-face support device. For example, temperature and strain sensors are attached to the A-beam to monitor deformation, thereby indirectly measuring the pointing deviation. Then, based on the measurement results, the azimuth and elevation control system and the sub-face attitude control system are driven to compensate for the relevant deformation. However, as the antenna aperture continues to increase, the influence of its own gravity, wind load, and solar radiation temperature becomes increasingly significant. Traditional methods for measuring and correcting pointing deviation and sub-face tracking errors are no longer sufficient to meet practical needs. These measurement methods cannot keep up with changes in wind load in terms of speed, nor can they achieve real-time correction of antenna pointing deviation and sub-face tracking errors under the influence of wind load and solar radiation temperature. Summary of the Invention

[0003] In view of the above problems, the present invention provides a method and apparatus for measuring and correcting antenna pointing deviation and sub-plane tracking error.

[0004] According to a first aspect of the present invention, a method for measuring and correcting antenna pointing deviation and sub-plane tracking error is provided, comprising: acquiring focal plane field data using a phased array feed placed on the focal plane of the antenna; determining the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error based on the focal plane field data; obtaining pointing deviation and sub-plane tracking error information of the current antenna based on the antenna aperture field; wherein the pointing deviation and sub-plane tracking error information includes a pointing deviation value, a sub-plane axial offset value, a sub-plane lateral offset value, and a sub-plane tilt value; and when any one of the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value is determined to be greater than or equal to a corresponding preset value, performing correction processing based on the current antenna pointing deviation and sub-plane tracking error information until the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value corresponding to the corrected pointing deviation and sub-plane tracking error information are all less than the corresponding preset values.

[0005] According to an embodiment of the present invention, the acquisition of focal plane field data using a phased array feed placed on the focal plane of the antenna includes: receiving or tracking a plane electromagnetic wave signal incident on the axially incident antenna using a phased array feed placed on the focal plane of the antenna to acquire focal plane field data; wherein, the phased array feed includes a dense feed array and / or a reconfigurable feed array.

[0006] According to an embodiment of the present invention, determining the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane follow-up error based on the focal field data includes: determining the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane follow-up error based on the focal field data through coordinate transformation processing and two-dimensional Fourier transform processing.

[0007] According to an embodiment of the present invention, when any one of the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value is determined to be greater than or equal to a corresponding preset value, correction processing is performed based on the pointing deviation and sub-plane follow-up error information of the current antenna until the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value corresponding to the corrected pointing deviation and sub-plane follow-up error information are all less than the corresponding preset values. This includes: determining the inverse of the pointing deviation and sub-plane follow-up error amount and the amplitude and phase adjustment values ​​of each array element in the phased array feed based on the pointing deviation and sub-plane follow-up error information of the current antenna; and performing correction processing based on the inverse and the amplitude and phase adjustment values.

[0008] According to an embodiment of the present invention, the preset value corresponding to the pointing deviation value is 0.001 seconds, the preset value corresponding to the axial offset value of the sub-face is 0.001 millimeters, the preset value corresponding to the lateral offset value of the sub-face is 0.001 millimeters, and the preset value corresponding to the tilt value of the sub-face is 0.001 seconds.

[0009] A second aspect of the present invention provides a device for measuring and correcting antenna pointing deviation and sub-plane tracking error, comprising: an acquisition module for acquiring focal plane field data using a phased array feed placed on the focal plane of the antenna; a determination module for determining the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error based on the focal plane field data; an acquisition module for obtaining pointing deviation and sub-plane tracking error information of the current antenna based on the antenna aperture field; wherein the pointing deviation and sub-plane tracking error information includes a pointing deviation value, a sub-plane axial offset value, a sub-plane lateral offset value, and a sub-plane tilt value; and a correction module for performing correction processing based on the current antenna pointing deviation and sub-plane tracking error information when any one of the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value is greater than or equal to a corresponding preset value, until the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value corresponding to the corrected pointing deviation and sub-plane tracking error information are all less than the corresponding preset values.

[0010] A third aspect of the present invention provides an electronic device comprising: one or more processors; and a memory for storing one or more programs, wherein, when the one or more programs are executed by the one or more processors, the one or more processors perform the methods disclosed above.

[0011] A fourth aspect of the present invention also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the methods disclosed above. Attached Figure Description

[0012] The above-described features, other objects, and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0013] Figure 1 A flowchart illustrating the method for measuring and correcting antenna pointing deviation and sub-plane tracking error according to an embodiment of the present invention is shown.

[0014] Figure 2 This schematic diagram illustrates the principle of real-time measurement of antenna reflector deformation using a focal plane dense feed array.

[0015] Figure 3 This schematic diagram illustrates the principle of rapidly measuring antenna reflector deformation using a focal plane reconfigurable feed array.

[0016] Figure 4 A schematic diagram of the parabolic reflector of the main focal antenna and the coordinate system of the focal plane is shown.

[0017] Figure 5 A schematic diagram illustrating the effect of pointing deviation on the caliber field is shown in the coordinate system diagram.

[0018] Figure 6 A schematic diagram illustrating the effect of the secondary surface axial offset on the caliber field is shown in the coordinate system diagram.

[0019] Figure 7 A schematic diagram illustrating the effect of the secondary surface lateral offset on the aperture field is shown in the coordinate system diagram.

[0020] Figure 8 A schematic diagram illustrating the effect of subsurface tilt on the aperture field using a coordinate system.

[0021] Figure 9 A schematic diagram of the deformation measurement and correction system is shown.

[0022] Figure 10 A schematic block diagram of a device for measuring and correcting antenna pointing deviation and subplane tracking error according to an embodiment of the present invention is shown; and

[0023] Figure 11 A block diagram of an electronic device suitable for implementing a method for measuring and correcting antenna pointing deviation and subplane tracking error according to an embodiment of the present invention is shown schematically. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0027] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0028] pass Figure 1 The method for measuring and correcting antenna pointing deviation and subplane tracking error according to the disclosed embodiments is described in detail.

[0029] Figure 1 A flowchart illustrating a method for measuring and correcting antenna pointing deviation and subplane tracking error according to an embodiment of the present invention is shown. Figure 1 As shown, this embodiment includes operations S101 to S104.

[0030] In operation S101, focal plane field data is acquired using a phased array feed placed on the focal plane of the antenna.

[0031] For example, a phased array feed placed on the focal plane of an antenna can be used to receive or track a planar electromagnetic wave signal incident on the axially incident antenna to obtain focal plane field data; wherein the phased array feed includes a dense feed array and / or a reconfigurable feed array.

[0032] A phased array feed is a group of feed arrays placed on the focal plane of an antenna. It can be understood that antenna pointing deviation and sub-plane tracking error will affect the field distribution on the antenna's focal plane. Through theoretical derivation, the pointing deviation and sub-plane tracking error can be quickly measured based on the focal plane field sampling data captured by the phased array feed. Then, by feeding this data back to the azimuth and elevation control system, the sub-plane pose control system, or by appropriately configuring the amplitude and phase of each element in the phased array feed, the antenna pointing deviation and sub-plane tracking error can be corrected, thus achieving real-time measurement and rapid correction.

[0033] In operation S102, the antenna aperture field corresponding to the current antenna pointing deviation and sub-surface follow-up error is determined based on the focal plane field data.

[0034] For example, based on the focal plane field data, the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error can be determined through coordinate transformation and two-dimensional Fourier transform processing.

[0035] In operation S103, the pointing deviation and sub-surface follow-up error information of the current antenna are obtained based on the antenna aperture field; wherein, the pointing deviation and sub-surface follow-up error information includes pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value and sub-surface tilt value.

[0036] It is understandable that the pointing deviation and sub-surface motion error information of the current antenna can be calculated based on the pointing deviation and sub-surface motion error inversion formula and the antenna aperture field.

[0037] For example, the pointing deviation and sub-face follow-up error information includes pointing deviation value, sub-face axial offset value, sub-face lateral offset value, and sub-face tilt value.

[0038] In operation S104, if any one of the values ​​of pointing deviation, sub-surface axial offset, sub-surface lateral offset, and sub-surface tilt is greater than or equal to the corresponding preset value, correction processing is performed based on the current antenna pointing deviation and sub-surface follow-up error information until the pointing deviation, sub-surface axial offset, sub-surface lateral offset, and sub-surface tilt values ​​corresponding to the corrected pointing deviation and sub-surface follow-up error information are all less than the corresponding preset values.

[0039] For example, based on the current antenna pointing deviation and sub-plane follow-up error information, determine the inverse of the pointing deviation and sub-plane follow-up error and the amplitude and phase adjustment values ​​of each array element in the phased array feed; and perform correction processing based on the inverse and amplitude and phase adjustment values.

[0040] For example, the preset value corresponding to the pointing deviation value is 0.001 seconds, the preset value corresponding to the axial offset value of the sub-face is 0.001 millimeters, the preset value corresponding to the lateral offset value of the sub-face is 0.001 millimeters, and the preset value corresponding to the tilt value of the sub-face is 0.001 seconds.

[0041] For example, △θ can be used thr A preset value, such as Δθ, represents the value corresponding to the pointing deviation. thr = 0.001 seconds; similarly, Δz can be used. sthr A preset value, such as Δz, represents the value corresponding to the axial offset of the sub-surface. sthr = 0.001 mm; Δr can be used sthr A preset value, such as Δr, represents the value corresponding to the lateral offset of the sub-surface. sthr = 0.001 mm; and △α can be used thr A preset value, such as Δα, represents the inclination value of the subsurface. thr = 0.001 seconds.

[0042] For example, the method for measuring and correcting antenna pointing deviation and sub-plane tracking error includes a focal plane field acquisition step, a two-dimensional Fourier transform step, a pointing deviation and sub-plane tracking error inversion step, and a pointing deviation and sub-plane tracking error correction step.

[0043] Focal field acquisition steps, such as directly receiving or tracking the plane electromagnetic wave signal of the incident antenna along the axial direction by placing a dense feed array or a reconfigurable feed array on the focal plane.

[0044] The two-dimensional Fourier transform step, for example, involves using the antenna focal field data obtained from the focal field acquisition step to calculate the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane follow-up error through coordinate transformation, two-dimensional Fourier transform, and other formulas.

[0045] The inversion steps for pointing deviation and secondary surface follow-up error are as follows: based on the inversion formula for pointing deviation and secondary surface follow-up error, the pointing deviation and secondary surface follow-up error information are obtained.

[0046] The pointing deviation and sub-plane follow-up error correction step involves feeding back the current pointing deviation and sub-plane follow-up error information obtained in the pointing deviation and sub-plane follow-up error inversion step to the azimuth and pitch control system, the sub-plane attitude control system, and the beamforming subsystem, so that the two can correct and compensate for the pointing deviation and sub-plane follow-up error through mechanical and electronic means, respectively, for correction processing.

[0047] Through continuous correction processing, the correction stops when the corresponding preset values ​​for pointing deviation, secondary surface axial offset, secondary surface lateral offset, and secondary surface tilt are all less than the corrected pointing deviation and secondary surface follow-up error information. For example, the focal field acquisition step, the two-dimensional Fourier transform step, the pointing deviation and secondary surface follow-up error inversion step, and the pointing deviation and secondary surface follow-up error correction step can be repeated until the pointing deviation value in the pointing deviation and secondary surface follow-up error inversion step is less than Δθ. thr The axial offset value of the secondary surface is less than Δz sthr The lateral offset value of the secondary face is less than Δr sthr And the inclination value of the secondary surface is less than Δα thr .

[0048] As can be seen, the antenna pointing deviation and sub-plane tracking error measurement and correction method of this invention not only avoids the inability of traditional measurement methods to measure pointing deviation and sub-plane tracking errors in real time or near real time, but also eliminates the need for a large number of sensors. Furthermore, the pointing deviation correction speed and sub-plane tracking error correction speed of the method of this invention can keep up with changes in wind load. This facilitates the rapid and real-time measurement of antenna pointing deviation and sub-plane tracking errors based on the focal plane field distribution obtained from the phased array feed. By feeding this data back to the azimuth and elevation control system, the sub-plane pose control system, and the beamforming subsystem, the antenna pointing deviation and sub-plane tracking errors can be rapidly corrected from both mechanical and electronic compensation perspectives.

[0049] The method for measuring and correcting antenna pointing deviation and sub-plane tracking error in this invention involves acquiring focal plane field data using a phased array feed placed on the antenna's focal plane, calculating the aperture field based on the two-dimensional Fourier transform relationship between the focal plane field and the aperture field, and then retrieving the antenna pointing deviation and sub-plane tracking error in real time based on the aperture field distribution. Finally, by feeding this data back to the azimuth and elevation control system and the sub-plane pose control system, or by appropriately configuring the amplitude and phase of each element in the phased array feed using the conjugate field matching method, pointing deviation and sub-plane tracking error can be quickly corrected.

[0050] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the present invention is not limited to the following embodiments.

[0051] Figure 2 This diagram schematically illustrates the principle of real-time measurement of antenna reflector deformation using a focal plane dense feed array. The left half, (a), shows the measurement of reflector deformation of the main focal antenna; the right half, (b), shows the measurement of reflector deformation of the Cadbury antenna. A planar electromagnetic wave signal is incident on the antenna along its axis, reflected by the reflector, and received by the dense feed array placed on the focal plane. The amplitude and phase of each element in this dense feed array can be independently controlled; it is also called a phased array feed. The element located at the focal point in the phased array feed is called the reference element. Figure 2 The a1 array element. For the main focal antenna, the reflecting surface is a parabolic surface; for the Cadbury antenna, the main reflecting surface is a parabolic surface.

[0052] Figure 3 This diagram schematically illustrates the principle of rapidly measuring antenna reflector deformation using a focal plane reconfigurable feed array. The left half, (a), shows the measurement of reflector deformation for a main focal antenna; the right half, (b), shows the measurement of reflector deformation for a Cadbury antenna. A planar electromagnetic wave signal is incident on the antenna along its axis, reflected by the reflector, and received by the reconfigurable feed array placed on the focal plane. The amplitude and phase of each element in this reconfigurable feed array can be independently controlled; it is also called a phased array feed. The element located at the focal point in the phased array feed is called the reference element. Figure 3 The a1 array element. For the main focal antenna, the reflecting surface is a parabolic surface; for the Cadbury antenna, the main reflecting surface is a parabolic surface.

[0053] The supports for array elements a1, b1, c1, d1, and e1 are connected together by a rigid connection, or these support supports can be made into a single unit. The array elements can be moved on the support supports to adjust their positions. The advantage of adjustable element positions on the support supports is that the positions of individual elements can be adjusted according to actual observation needs, or elements of different sizes can be used.

[0054] Reconfigurable feed array measurements require each element to scan the focal plane, in order to Figure 3 For example, by rotating the array element support of the five array elements connected in the above manner counterclockwise once, the array elements a1, b1, c1, d1, and e1 can scan the focal plane. One way to shorten the mechanical scanning time is to use more array elements, for example, in... Figure 3 If array elements b2, c2, d2, and e2 are added opposite to the array elements b1, c1, d1, and e1 respectively, the array element support can rotate half a turn to drive the array elements to scan the focal plane, which means the scanning time can be reduced by half. However, increasing the number of array elements will also bring about the problem of mutual coupling between array elements, especially when the spacing between array elements is very small, the mutual coupling will have a great impact.

[0055] By properly designing the positions of each scanning element and dispersing them, the mutual coupling effect of a reconfigurable feed array with a relatively small number of elements can be reduced. When the number of elements in the reconfigurable feed array is reduced to 1, the mutual coupling effect of the elements no longer exists, but at this time the elements need to perform both circumferential and radial movements to scan the focal plane, thus taking longer.

[0056] Figure 4 The schematic diagram shows the parabolic reflector of the main focal antenna and the coordinate system of the focal plane.

[0057] Where B is the vertex of parabola S; P is any point on parabola S; O is the foot of the perpendicular from point P to the axis of the parabola; the focus o of the parabola is the origin; the axis of the parabola is the z-axis; an arbitrary x-axis is chosen, and a spatial rectangular coordinate system oxyz is constructed according to the right-hand screw rule; the local coordinate system X-axis passing through point O is parallel to the x-axis; the feed source is at point P', and the lateral distance from the focus o of the parabola is oP' = δ; the distance from point P to the focus o of the parabola is oP = r. According to scalar diffraction theory:

[0058]

[0059] Where E(δ,φ′) is the focal plane field distribution; k is the wavenumber, i.e., k = 2π / λ, where λ is the operating wavelength; u = sinθ, and when θ reaches its maximum value... At time (when point P is located at the edge of the aperture surface), there is F(u,φ) is the aperture field.

[0060] Let p = ucosφ / λ, q = usinφ / λ, x = tcosφ′, y = tsinφ′, the above equation becomes

[0061]

[0062] in,

[0063] Therefore, applying a two-dimensional Fourier transform to E(x,y) yields...

[0064] G(p,q)=F[E(x,y)] (3)

[0065] Where F[...] denotes the two-dimensional Fourier transform,

[0066] Therefore, there is

[0067]

[0068] Aperture surface field distribution The relationship between F(p,q) and F(p,q) is

[0069]

[0070] in

[0071] Thus, the aperture surface phase distribution is obtained.

[0072]

[0073] Here, Phase{...} represents calculating the phase.

[0074] Figure 5 A schematic diagram illustrating the effect of pointing deviation on the aperture field is shown in the coordinate system. Incident plane wave direction vector: The phase baseline of the incident plane wave at the aperture surface is perpendicular to the line y = xtanφ, and the corresponding equation is:

[0075] y = -xcotφ

[0076] Let P′ be the foot of the perpendicular from any point P(x,y) on the aperture surface to the phase reference line. Let the coordinates of point P be (x,y). P ,y P If the equation of line P′P is given, then the equation of line P′P can be set as follows:

[0077] yy P =tanφ(xx) P )

[0078] Solve the equations of the phase baseline and the corresponding equations of the line P′P simultaneously:

[0079]

[0080] The coordinates of point P′ are:

[0081] Aperture baseline vector: Right now

[0082]

[0083] Therefore, the time delay is:

[0084] By changing the coordinates of point P back to (x, y), we obtain the phase delay at any point on the aperture surface:

[0085]

[0086] Where k = 2π / λ, λ is the operating wavelength; r P It is the polar radius at point P, φ P It is the polar angle of point P.

[0087] Figure 6 A schematic diagram illustrating the effect of secondary surface axial offset on the aperture field is shown in the coordinate system. Secondary surface axial offset Δz s The resulting path difference is approximately equal to Figure 6 China P 11 Q segment + P 11 Line segment A:

[0088] Δz s (cosθ p +cosθ f )

[0089] If the path difference corresponding to the center point of the aperture surface is set to zero, then the phase delay at any point on the aperture surface can be obtained:

[0090]

[0091] in, f a M is the focal length of the Cassegrain antenna, and M is the magnification factor.

[0092] Figure 7 A schematic diagram illustrating the effect of the secondary surface lateral offset on the aperture field is shown in the coordinate system. Secondary surface lateral offset Δr s The resulting path difference is approximately equal to the above. Figure 7 Line segment P2Q - Line segment P1A:

[0093] Δr s (sinθ f -sinθ p )

[0094] If we consider the lateral offset Δr s If the turning angle is φ0, then the path difference in the above formula should be corrected to:

[0095] Δr s (sinθ f -sinθ p cos(φ-φ0)

[0096] Phase delay at any point on the aperture surface:

[0097]

[0098] Figure 8 The diagram illustrates the effect of the subsurface tilt on the aperture field using a coordinate system. The subsurface is rotated by a small angle Δα around its vertex V, and any point P1 on the subsurface moves from its original position to point P. 11 Then the arc length P1P 11 Approximately equal to line length P1P 11 .

[0099] Assuming line length VP1 equals L, then P1P 11 =LΔα.

[0100] The path difference caused by the tilt Δα of the secondary surface is approximately equal to the upper surface. Figure 8 Middle - P1Q line segment - P1A line segment.

[0101] In RtΔP1P 11 Q、RtΔP1P 11 In line A, there are line segments P1Q = LΔαsin∠P1P. 11 Q, line segment P1A = LΔαsin∠P1P 11 A.

[0102] In ΔF2P1F1, let ∠VP1F1=θ p2 ∠VP1F2=θ f2 According to the Law of Sines, we have:

[0103] as well as

[0104] Where c and a are the semi-focal length and real semi-axis of the secondary surface (hyperbola), respectively. Thus, Lsinθ is obtained. p2 =(ca)sinθ p and Lsinθ f2 = (c+a)sinθ f .

[0105] Because ∠VP1P 11 ≈90°, therefore ∠P1P 11 Q = 90° - ∠QP1P 11 =90°-(180°-90°-θ) p2 )=θ p2 And ∠P1P 11 A = 90° - ∠AP1P 11 =∠VP1F2=θ f2 .

[0106] Therefore, line segment P1Q = LΔαsin∠P1P11 Q=LΔαsinθ p2 =Δα(ca)sinθ p

[0107] Line segment P1A = LΔαsin∠P1P 11 A=LΔαsinθ f2 =Δα(c+a)sinθ f .

[0108] Telescope magnification:

[0109]

[0110] Where e is the eccentricity of the hyperbola.

[0111] In summary, the path difference caused by the tilt Δα of the secondary surface is approximately equal to... Figure 8 The middle segment - P1Q segment - P1A segment, that is

[0112] -Δα(ca)(sinθ p +Msinθ f )

[0113] If we consider the rotation angle φ0 where the secondary surface tilt Δα is located, then the path difference in the above formula should be corrected to:

[0114] -Δα(ca)(sinθ p +Msinθ f cos(φ-φ0)

[0115] Phase delay at any point on the aperture surface:

[0116]

[0117]

[0118] Based on the phase field distribution in equation (6), the unknowns Δθ, φ, and Δz in equation (11) are fitted using the least squares method. s , △r s , △α and φ0.

[0119] Based on the derived antenna aperture field distribution and the above formula, the pointing deviation and sub-plane tracking error information can be calculated: Δθ, Δz s , △r s And Δα. This information is fed back to the antenna azimuth and elevation control system, the sub-face pose control system, and the beamforming system. The mechanical adjustment output by each system is the opposite of the pointing deviation and the sub-face follow-up error. In the electronic compensation method, the amplitude and phase adjustment values ​​of each array element are solved according to the defocusing theory, etc.

[0120] Figure 9 A schematic diagram of the deformation measurement and correction system is shown. Point-source or extended-source radio signals are reflected and converged by the antenna to reach the phased array feed. Each element of the phased array feed receives a portion of energy, and its received signal can be represented as T(Δx,Δy). After passing through a low-noise amplifier (LNA), down-converted DC, and A / D sampling, the signal enters the FPGA array.

[0121] In the FPGA array, focal plane field amplitude and phase analysis are first performed. The pointing deviation feedback, main plane deformation feedback, and secondary plane servo feedback are then fed back to the antenna azimuth and elevation servo drive system, the main plane control system, and the secondary plane control system, respectively. The pointing deviation and secondary plane deformation feedback are the inverses of the aforementioned pointing deviation and secondary plane servo errors. Next, multi-beam weighted synthesis is performed. The beam weighting value used to correct the pointing deviation and secondary plane servo errors, namely the aforementioned T″(Δx,Δy), is then input into the GPU for further processing and application.

[0122] Figure 10 A schematic block diagram of a device for measuring and correcting antenna pointing deviation and subplane tracking error according to an embodiment of the present invention is shown.

[0123] like Figure 10 As shown, the antenna pointing deviation and sub-plane tracking error measurement and correction device 1000 of this embodiment includes an acquisition module 1010, a determination module 1020, an acquisition module 1030 and a correction module 1040.

[0124] The acquisition module 1010 is used to acquire focal plane field data using a phased array feed placed on the focal plane of the antenna; the determination module 1020 is used to determine the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error based on the focal plane field data; the obtaining module 1030 is used to obtain the current antenna pointing deviation and sub-plane tracking error information based on the antenna aperture field; wherein, the pointing deviation and sub-plane tracking error information includes pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value; and the correction module 1040 is used to perform correction processing based on the current antenna pointing deviation and sub-plane tracking error information when any one of the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value is greater than or equal to the corresponding preset value, until the pointing deviation value, sub-plane axial offset value, sub-plane lateral offset value, and sub-plane tilt value corresponding to the corrected pointing deviation and sub-plane tracking error information are all less than the corresponding preset values.

[0125] According to embodiments of the present invention, any plurality of modules among the acquisition module 1010, determination module 1020, acquisition module 1030, and correction module 1040 may be combined into one module, or any one of these modules may be split into multiple modules. Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of other modules and implemented in one module. According to embodiments of the present invention, at least one of the acquisition module 1010, determination module 1020, acquisition module 1030, and correction module 1040 may be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or any other reasonable means of integrating or packaging circuitry, or implemented in software, hardware, or firmware, or in any one of the three implementation methods or a suitable combination of any of them. Alternatively, at least one of the acquisition module 1010, determination module 1020, obtaining module 1030 and correction module 1040 may be implemented at least partially as a computer program module, which can perform corresponding functions when the computer program module is run.

[0126] Figure 11 A block diagram of an electronic device suitable for implementing a method for measuring and correcting antenna pointing deviation and subplane tracking error according to an embodiment of the present invention is shown schematically.

[0127] like Figure 11 As shown, an electronic device 1100 according to an embodiment of the present invention includes a processor 1101, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1102 or a program loaded from a storage portion 1108 into a random access memory (RAM) 1103. The processor 1101 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 1101 may also include onboard memory for caching purposes. The processor 1101 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present invention.

[0128] RAM 1103 stores various programs and data required for the operation of electronic device 1100. Processor 1101, ROM 1102, and RAM 1103 are interconnected via bus 1104. Processor 1101 executes various operations of the method flow according to embodiments of the present invention by executing programs in ROM 1102 and / or RAM 1103. It should be noted that the programs may also be stored in one or more memories other than ROM 1102 and RAM 1103. Processor 1101 may also execute various operations of the method flow according to embodiments of the present invention by executing programs stored in said one or more memories.

[0129] According to an embodiment of the present invention, the electronic device 1100 may further include an input / output (I / O) interface 1105, which is also connected to the bus 1104. The electronic device 1100 may also include one or more of the following components connected to the I / O interface 1105: an input section 1106 including a keyboard, mouse, etc.; an output section 1107 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 1108 including a hard disk, etc.; and a communication section 1109 including a network interface card such as a LAN card, modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive 1110 is also connected to the I / O interface 1105 as needed. A removable medium 1111, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 1110 as needed so that computer programs read from it can be installed into the storage section 1108 as needed.

[0130] The present invention also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs, which, when executed, implement the method according to the embodiments of the present invention.

[0131] According to embodiments of the present invention, a computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of the present invention, a computer-readable storage medium may include ROM 1102 and / or RAM 1103 and / or one or more memories other than ROM 1102 and RAM 1103 described above.

[0132] Embodiments of the present invention also include a computer program product comprising a computer program containing program code for performing the methods shown in the flowchart. When the computer program product is run on a computer system, the program code enables the computer system to implement the method for measuring and correcting antenna pointing deviation and subplane tracking error provided in the embodiments of the present invention.

[0133] When the computer program is executed by the processor 1101, it performs the functions defined in the system / apparatus of this embodiment of the invention. According to embodiments of the invention, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0134] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and may be downloaded and installed via the communication section 1109, and / or installed from the removable medium 1111. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0135] In such an embodiment, the computer program can be downloaded and installed from a network via communication section 1109, and / or installed from removable medium 1111. When the computer program is executed by processor 1101, it performs the functions defined in the system of this embodiment of the invention. According to embodiments of the invention, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0136] According to embodiments of the present invention, program code for executing the computer programs provided in the embodiments of the present invention can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0137] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0138] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0139] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A method for measuring and correcting antenna pointing deviation and subplane tracking error, comprising: Focal field data is obtained using a phased array feed placed on the focal plane of the antenna; Determine the antenna aperture field corresponding to the current antenna pointing deviation and sub-surface follow-up error based on the focal plane field data; The pointing deviation and sub-surface tracking error information of the current antenna are obtained based on the antenna aperture field; wherein, the pointing deviation and sub-surface tracking error information includes pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value; as well as If any one of the pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value is greater than or equal to the corresponding preset value, correction processing is performed based on the pointing deviation and sub-surface follow-up error information of the current antenna until the pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value corresponding to the corrected pointing deviation and sub-surface follow-up error information are all less than the corresponding preset value.

2. The method according to claim 1, wherein, The method of acquiring focal plane field data using a phased array feed placed on the focal plane of the antenna includes: Focal field data is obtained by receiving or tracking planar electromagnetic wave signals incident on the antenna along the axial direction using a phased array feed placed on the focal plane of the antenna; wherein, the phased array feed includes a dense feed array and / or a reconfigurable feed array.

3. The method according to claim 1, wherein, The step of determining the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error based on the focal plane field data includes: Based on the focal plane field data, coordinate transformation and two-dimensional Fourier transform are used to determine the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error.

4. The method according to claim 1, wherein, When any one of the pointing deviation value, sub-face axial offset value, sub-face lateral offset value, and sub-face tilt value is greater than or equal to a corresponding preset value, correction processing is performed based on the current antenna pointing deviation and sub-face follow-up error information until the pointing deviation value, sub-face axial offset value, sub-face lateral offset value, and sub-face tilt value corresponding to the corrected pointing deviation and sub-face follow-up error information are all less than the corresponding preset values, including: Based on the current antenna pointing deviation and sub-plane tracking error information, determine the inverse of the pointing deviation and sub-plane tracking error, and the amplitude and phase adjustment values ​​of each element in the phased array feed; and The correction process is performed based on the inverse number and the amplitude and phase adjustment values.

5. The method according to claim 1, wherein, The preset value corresponding to the pointing deviation value is 0.001 seconds, the preset value corresponding to the axial offset value of the sub-face is 0.001 mm, the preset value corresponding to the lateral offset value of the sub-face is 0.001 mm, and the preset value corresponding to the tilt value of the sub-face is 0.001 seconds.

6. A device for measuring and correcting antenna pointing deviation and subplane tracking error, comprising: The acquisition module is used to acquire focal plane field data using a phased array feed placed on the focal plane of the antenna; The determination module is used to determine the antenna aperture field corresponding to the current antenna pointing deviation and sub-surface follow-up error based on the focal field data; The acquisition module is used to obtain the pointing deviation and sub-surface follow-up error information of the current antenna based on the antenna aperture field; wherein, the pointing deviation and sub-surface follow-up error information includes pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value; as well as The correction module is used to perform correction processing based on the current antenna pointing deviation and sub-surface follow-up error information when any one of the pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value is greater than or equal to the corresponding preset value, until the pointing deviation value, sub-surface axial offset value, sub-surface lateral offset value, and sub-surface tilt value corresponding to the corrected pointing deviation and sub-surface follow-up error information are all less than the corresponding preset values.

7. The apparatus according to claim 6, wherein, The acquisition module is specifically used for: Focal field data is obtained by receiving or tracking planar electromagnetic wave signals incident on the antenna along the axial direction using a phased array feed placed on the focal plane of the antenna; wherein, the phased array feed includes a dense feed array and / or a reconfigurable feed array.

8. The apparatus according to claim 6, wherein, The determining module is specifically used for: Based on the focal plane field data, coordinate transformation and two-dimensional Fourier transform are used to determine the antenna aperture field corresponding to the current antenna pointing deviation and sub-plane tracking error.

9. An electronic device, comprising: One or more processors; Storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors perform the method according to any one of claims 1 to 5.

10. A computer-readable storage medium having stored thereon executable instructions that, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 5.

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