Encircling type folding satellite-borne phased-array antenna structure and folding and unfolding method

Abstract

The invention provides a surrounding type folding satellite-borne phased-array antenna structure and a folding and unfolding method, and the structure comprises three sub-board antennas with the same size along the azimuth direction of the antenna, the three sub-board antennas are respectively a-X sub-board antenna, a middle board antenna and a + X sub-board antenna according to the coordinate system direction of the antenna, and the sub-board antennas are completely consistent in structure and composition, the daughter board antennas realize interconnection of all assembly modules through an integrated mounting plate, and all the daughter board antennas are folded into a straight line shape in a flattened manner according to an encircling folding form; the daughter board antenna is folded and unfolded in stages, and the antenna is unfolded in stages in a pure mechanical triggering mode. According to the invention, a pure mechanical triggering mode is adopted to realize staged unfolding of the antenna, and additional driving and control assemblies do not need to be added.

Description

Technical Field

[0001] The present invention belongs to the field of satellite-borne deployable antenna structures and antenna folding and unfolding mechanisms, and in particular relates to an embracing, foldable satellite-borne phased array antenna structure and a folding and unfolding method. Background Art

[0002] Phased array antennas are widely used in radar, communication, electronic countermeasures and other fields. The installation platforms of phased array antennas include space-based, land-based, mobile vehicles, etc. Compared with phased array antennas on road-based, vehicle-mounted, ship-mounted and other platforms, space-borne phased array antennas have the function of electromagnetic radiation. In addition, their structures must be retractable, deployable, lightweight, and highly reliable. Therefore, space-borne phased array antennas have always been the focus of research and development.

[0003] At present, the development of satellite-borne phased array antennas has the following trends: 1) High density and large scanning: In order to obtain a wider range of scanning performance and antenna gain, phased array antennas need to have a higher density of channels and a larger number of RF components. 2) Antenna folding, miniaturization and lightness: More and more payloads are launched in a multi-satellite mode, and satellite-borne antennas need to have a smaller folded volume and lighter weight. 3) Low cost: In recent years, the commercialization of the aerospace field has developed rapidly, and satellite payloads need to have lower manufacturing costs.

[0004] The existing satellite-borne phased array antenna structure generally adopts the form of "active mounting plate + heat pipe + frame". This structure is simple to install and integrate, and has high maintainability. It is often suitable for large satellite-borne phased array antennas. However, the frame-configured antenna has a large volume when folded up, and the structural weight accounts for a high proportion.

[0005] In order to achieve a high folding ratio of the antenna, the antenna needs to be designed to be folded with multiple sub-boards, and the folding and unfolding mechanism of the antenna has the function of controlling the unfolding sequence. At present, the unfolding sequence control of the satellite-borne multi-fold antenna is often achieved through the program control of the drive motor and the synchronous wheel mechanism.

[0006] However, the current technical solutions have disadvantages:

[0007] 1. The antenna structure of "active mounting plate + heat pipe + frame" has many structural parts and accounts for a large proportion of the total weight of the antenna, which is not conducive to the lightweight design of the antenna; the antenna frame will increase the thickness of the antenna sub-board, making the antenna larger when folded; the carbon fiber frame and phase change heat pipe used in the satellite-borne phased array antenna are relatively expensive.

[0008] 2. The use of motors to control the deployment sequence of the antenna requires the addition of additional drive control components, and the mechanical design is not clever enough. It also brings a series of problems, including: the motor-driven antenna deployment needs to be equipped with a control drive unit, which increases the weight of the antenna; the satellite platform needs to provide additional power supply and telemetry resources; the cost of the antenna folding and unfolding mechanism is relatively high, etc. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a structure and folding method of an embracing folding satellite-borne phased array antenna. Aiming at the current small satellite platform, the folding and unfolding mechanism configuration of the embracing folding is designed, and a control method for sequentially unfolding the embracing antenna is designed. The phased array antenna has the advantages of high folding rate, light weight, simple and reliable structure, low cost, and less satellite platform resources occupied.

[0010] In order to achieve the above object, the present invention adopts the following technical solution:

[0011] A wraparound folded satellite-borne phased array antenna structure includes three sub-board antennas of the same size along the antenna azimuth direction, which are -X sub-board antenna, middle board antenna and +X sub-board antenna respectively according to the direction of the antenna coordinate system. Each sub-board antenna is completely consistent in structure and composition. The sub-board antennas realize interconnection of various component modules through a multifunctional integrated mounting plate. There is a connection structure between adjacent antenna sub-boards, and each sub-board antenna is flattened and folded into a "straight line" in an wraparound folding form through the connection structure; or each sub-board antenna is folded and unfolded in stages through the connection structure, and the antenna is unfolded in stages by a mechanical trigger.

[0012] Furthermore, the structure of the sub-board antenna adopts a layered design. Vertically to the direction of the mounting board surface, the structure of the sub-board antenna is divided into four layers. The first layer includes a waveguide array, the second layer includes a RF transceiver component, the third layer includes an integrated mounting board, and the fourth layer includes a wave control power supply module, a delay amplification component, a RF power divider module, and a high and low frequency cable network. The mechanical connection between the layers is achieved through the mounting interface of the integrated mounting board, and the electrical interconnection is achieved through high and low frequency blind plug-in.

[0013] Furthermore, the radiation waveguide array and the RF transceiver component are fixedly connected to the front of the integrated mounting plate, and the wave control power supply module, the delay amplifier component, and the RF power divider module are fixedly connected to the back of the integrated mounting plate; the input port of the radiation waveguide array and the RF end branch port of the RF transceiver component are blindly connected through SMP-KK, the RF main port of the RF transceiver component is interconnected with the RF branch port of the delay amplifier component, the low-frequency control port of the wave control power supply module is interconnected with the control port of the RF transceiver component, and the RF ports of the delay amplifier component and the RF power divider module are respectively interconnected with the high-frequency port of the RF transceiver component.

[0014] Furthermore, the mechanical triggering form is to set up an escapement device to control the staged deployment of the antenna, and the escapement device includes an escapement slot and a sub-board limit slider. The escapement slot is fixedly connected to the driving rod of the virtual axis hinge, and the sub-board limit slider is fixed on the side of the -X sub-board antenna. The protrusion at the lower end of the sub-board limit slider cooperates with the escapement slot to realize sliding.

[0015] Furthermore, the connection structure includes a virtual axis hinge and a real axis hinge. When the antenna is in a folded state, the -X sub-board antenna, the middle board antenna, and the +X sub-board antenna are embraced, folded and bent by the virtual axis hinge and the real axis hinge, and the antenna is in a "straight shape" in the folded state; the fixed end of the virtual axis hinge is fixedly connected to the edge of the middle board antenna, and the movable end of the virtual axis hinge is fixedly connected to the edge of the +X sub-board antenna; the fixed end of the real axis hinge is fixedly connected to the edge of the middle board antenna, and the movable end of the real axis hinge is fixedly connected to the edge of the -X sub-board antenna; along the direction perpendicular to the board surface, the +X sub-board antenna is placed on the top layer, the -X sub-board antenna is placed on the middle layer, and the middle board antenna is placed on the bottom layer.

[0016] Furthermore, the three sub-board antennas are clamped and fixed by six evenly distributed clamping and releasing devices to keep the antennas in a folded state and to prevent the driving hinges from driving the sub-board antennas to rotate.

[0017] Furthermore, a coil spring is arranged outside the hinge rotation center axis as a driving force source, and a damper is arranged at the fixed end of the hinge to suppress the faster rotation speed during the antenna deployment process.

[0018] The present invention also provides a method for folding and unfolding an embracing satellite-borne phased array antenna structure, which adopts a hierarchical, sequential, and staged unfolding method to divide the unfolding of the phased array antenna into two stages: in the first stage, the +X sub-board antenna placed on the top layer is unfolded; in the second stage, the -X sub-board antenna placed on the middle layer is unfolded.

[0019] Furthermore, an escapement device is provided to control the unfolding of the antenna, the escapement device comprising an escapement slot and a sub-board limiting slider, the escapement slot being fixedly connected to the driving rod of the virtual axis hinge; the sub-board limiting slider being fixed to the side of the -X sub-board antenna; in the first stage of unfolding, the sub-board limiting slider slides in the escapement slot, and the middle layer -X sub-board antenna is constrained by the sub-board limiting slider and is in a retracted state; when the +X sub-board antenna rotates and unfolds to the secondary unfolding separation angle α, the sub-board limiting slider slides out of the escapement slot, and the -X sub-board antenna starts to rotate and unfold under the drive of the real axis hinge.

[0020] Furthermore, the range of the secondary deployment separation angle α is 90°<α<180°.

[0021] Compared with the existing satellite-borne deployable phased array antenna, the present invention has the following beneficial effects:

[0022] 1) The antenna structure is suitable for high-density channel antenna integration, and the sub-board antenna is small in thickness;

[0023] 2) The antenna has a small folding volume and a high folding ratio (can reach 3:1);

[0024] 3) The antenna installation interfaces are evenly distributed on one installation plane, occupying less installation space of the satellite platform, with fewer installation interface resources, and adapting to a variety of satellite platforms;

[0025] 4) A purely mechanical triggering method is used to achieve hierarchical deployment of the antenna without the need for additional drive and control components.

[0026] In summary, the antenna of the present invention adopts a layered design in terms of structural design, and the various modules that make up the antenna are vertically interconnected in terms of electrical interfaces and mechanical interfaces in the direction perpendicular to the array surface. The antenna realizes the interconnection of various component modules through a multifunctional integrated structure. The antenna is divided into three sub-board antennas, and each sub-board antenna is flattened and folded into a "straight line" in an embracing manner. In addition, the present invention adopts a hierarchical, sequential, and staged deployment form, and the antenna deployment is divided into two stages: the first stage is the deployment of the +X sub-board antenna placed on the top layer, and the second stage is the deployment of the -X sub-board antenna placed on the middle layer. Virtual axis hinges and real axis hinges are selected as the + / - side panel antenna deployment drive device, and the hinges all use coil springs as the driving force source, and dampers are arranged to suppress the faster rotation speed during the antenna deployment process. The present invention uses a purely mechanical escapement device to control the deployment timing of the antenna. The escapement device is composed of an escapement slideway fixedly connected to the virtual axis hinge and a sub-board limit slider fixed to the -X sub-board antenna. The positional relationship between the virtual axis hinge drive shaft and the sub-board antenna at different stages of deployment is used as a trigger condition for the deployment timing control. The present invention realizes the lightweight and low-cost of the micro-sized satellite-borne phased array antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the unfolded state diagram of the spaceborne phased array antenna;

[0028] Figure 2 This is a diagram of the folded state of the satellite-borne phased array antenna;

[0029] Figure 3 The internal module composition and module interconnection diagram of the antenna;

[0030] Figure 4 To unfold the driving hinge diagram;

[0031] Figure 5 A diagram for the division of antenna deployment stages;

[0032] Figure 6 It is a schematic diagram of the virtual axis hinge and the escapement device for controlling the unfolding timing;

[0033] Figure 7This is a diagram of the first stage of antenna deployment;

[0034] Figure 8 This is a diagram of the second stage of antenna deployment;

[0035] Fig. 9 The hinge diagram of the real axis of the unfolding drive.

[0036] Among them, the figure markings are: -X sub-board antenna 1, middle board antenna 2, +X sub-board antenna 3, waveguide array 4, RF transceiver component 5, integrated mounting plate 6, wave control power supply module 7, delay amplification component 8, RF power divider module 9, high and low frequency cable network 10, real axis hinge 11, virtual axis hinge 12, clamping release device 13, real axis hinge fixed end 111, real axis hinge moving end 112, coil spring 113, damper 114, escapement slide groove 121, sub-board limit slider 122, first drive rod 123, second drive rod 124, first connecting rod 125, second connecting rod 126, virtual axis hinge moving end 127, virtual axis hinge fixed end 128. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] According to the actual parameter requirements of the satellite-borne phased array antenna, the present invention designs an embracing folding satellite-borne phased array antenna structure and a folding and unfolding method. The antenna realizes the interconnection of various component modules through an integrated mounting plate, and the sub-board antenna is folded and flattened into a "straight line" in an embracing folding form. The sub-board antenna can be folded in stages when unfolded, and a purely mechanical triggering form is used to realize the staged unfolding of the folding and unfolding mechanism, without adding additional drive and control components. While ensuring the basic electrical performance indicators of the antenna, the present invention can effectively achieve a high folding rate, light weight, and low cost of the antenna.

[0039] like Figure 1 As shown, the antenna is divided into three sub-board antennas of the same size along the azimuth direction, which are -X sub-board antenna 1, middle-board antenna 2, and +X sub-board antenna 3 according to the direction of the antenna coordinate system. Each antenna sub-board is completely consistent in structure and composition.

[0040] like Figure 3As shown, in order to achieve lightweight and high-density integration of the antenna, the sub-board antenna adopts a layered design. Vertically to the mounting board surface, the sub-board antenna structure is divided into four layers. The first layer includes a waveguide array 4, the second layer includes a radio frequency transceiver component 5, the third layer includes an integrated mounting board 6, and the fourth layer includes a wave control power supply module 7, a delay amplifier component 8, a radio frequency power divider module 9, and a high and low frequency cable network 10. Figure 2 .

[0041] The mechanical connection between the layers is achieved through the mounting interface of the integrated mounting plate 6, and the electrical interconnection is achieved through high and low frequency blind plugging, such as Figure 3 As shown, the radiation waveguide array 4 and the RF transceiver assembly 5 are fixedly connected to the front of the integrated mounting plate 6, and the wave control power module 7, the delay amplifier assembly 8, and the RF power divider module 9 are fixedly connected to the back of the integrated mounting plate 6. The input port of the radiation waveguide array 4 and the RF end branch port of the RF transceiver assembly 5 are blindly connected through smp-kk, the RF main port of the RF transceiver assembly 5 is interconnected with the RF branch port of the delay amplifier assembly 8, the low-frequency control port of the wave control power module 7 is interconnected with the control port of the RF transceiver assembly 5, and the RF ports of the delay amplifier assembly 8 and the RF power divider module 9 are respectively interconnected with the high-frequency port of the RF transceiver assembly 5.

[0042] like Figure 2 As shown, when the antenna is in the folded state, the -X sub-board antenna 1, the middle-board antenna 2, and the +X sub-board antenna 3 are embraced, stored and bent by the real axis hinge 11 and the virtual axis hinge 12, and the antenna is in a "straight line" state. In the direction perpendicular to the board surface, the +X sub-board antenna 3 is placed on the top layer, the -X sub-board antenna 1 is placed on the middle layer, and the middle-board antenna 2 is placed on the bottom layer. The three sub-board antennas are clamped and fixed by 6 evenly distributed clamping and releasing devices 13 to maintain the folded state of the antenna and inhibit the driving hinge from driving the sub-board antenna to rotate. The bottom support of the clamping and releasing device 13 is fixed to the satellite platform.

[0043] like Figure 4 As shown, the real axis hinge 11 and the virtual axis hinge 12 used in the present invention are both passively driven, that is, the coil spring 113 is used as the driving force source. At the same time, in order to reduce the impact of the antenna being too fast at the end of the folding and unfolding movement, a damper 114 is arranged at the hinge rotation center to suppress the faster rotation speed during the antenna unfolding process.

[0044] like Figure 6As shown, the virtual axis hinge 12 includes a first driving rod 123 and a second driving rod 124, a first connecting rod 125, and a second connecting rod 126. The two are connected through a central rotation axis in the middle. The first driving rod 123 and the first connecting rod 125 are hinged to the virtual axis hinge movable end 127, the second driving rod 124 and the second connecting rod 126 are hinged to the virtual axis hinge fixed end 128, and the first connecting rod 125 and the second connecting rod 126 are connected through the central rotation axis in the middle.

[0045] like Figure 6 As shown, the virtual axis hinge moving end 127 of the virtual axis hinge 12 is fixedly connected to the +X sub-board antenna 3, and the virtual axis hinge fixed end 128 is fixedly connected to the middle board antenna 2. The virtual axis hinge 12 uses two coil springs 113 as a driving force source, one of which is respectively fixedly connected to the first driving rod 123 of the virtual axis hinge and the moving end of the virtual axis hinge 127; the other coil spring 113 is fixedly connected to the second driving rod 124 of the virtual axis hinge and the fixed end 128 of the virtual axis hinge. When the virtual axis hinge 12 is unfolded, the coil spring 113 acts on the first driving rod 123 and the second driving rod 124 of the virtual axis hinge to rotate.

[0046] The present invention adopts a purely mechanical escapement device to control the deployment of the antenna. The escapement device consists of two parts. One part is the escapement groove 121, which is fixedly connected to the first connecting rod 125 of the virtual axis hinge 12; the other part is the sub-board limiting slider 122, which is fixed on the side of the -X sub-board antenna 1.

[0047] like Figure 4 , Fig. 9 As shown, the real axis hinge 11 includes a real axis hinge fixed end 111 and a real axis hinge movable end 112. The real axis hinge fixed end 111 is fixedly connected to the edge of the middle plate antenna 2, and the real axis hinge movable end 112 is fixedly connected to the edge of the -X sub-plate antenna 1; the damper 114 is arranged outside the coil spring 113, and the spring force of the coil spring 113 acts on the real axis hinge movable end 112 to drive the antenna to unfold, and the damper 114 limits the unfolding speed of the real axis hinge movable end 112 to avoid a faster unfolding speed during the antenna unfolding process.

[0048] like Figure 6 As shown, the moving end of the real axis hinge is connected to the escapement slide groove 121, and the escapement slide groove 121 is slidably connected to the -X sub-board antenna 1 through the sub-board limiting slider 122 on the -X sub-board antenna 1.

[0049] according to Figure 2It can be found from the antenna's encircling folded configuration that when the clamping release device 13 is unlocked and released, if the antenna begins to unfold in a free state, the real axis hinge 11 and the virtual axis hinge 12 will perform folding and unfolding movements at the same time, and the -X sub-board antenna 1 and the +X sub-board antenna 3 will interfere with each other, and the unfolding movement cannot operate normally. Therefore, for the encircling folded antenna folding and unfolding mechanism, it is necessary to adopt a hierarchical, sequential and staged unfolding form.

[0050] like Figure 5 As shown, the present invention adopts a hierarchical, sequential and staged deployment method to divide the deployment of the phased array antenna into two stages: the first stage is to deploy the +X sub-board antenna placed on the top layer; the second stage is to deploy the -X sub-board antenna placed on the middle layer.

[0051] like Figure 6 As shown, the present invention uses a purely mechanical escapement device to control the deployment of the antenna. The escapement device consists of two parts. One part is the escapement slide 121, which is fixed to the first driving rod 123 of the virtual axis hinge 12; the escapement slide 121 is an annular structure with a circular arc-shaped slide in the middle. The other part is the sub-board limit slider 122, which is fixed on the side of the -X sub-board antenna 1. The lower end of the sub-board limit slider 122 is provided with a protrusion, which cooperates with the circular arc-shaped slide of the escapement slide 121 and slides in the circular arc-shaped slide.

[0052] like Figure 6 , Figure 7 As shown, in the first stage of unfolding, due to the spring force of the coil spring 113, the sub-board limit slider 122 slides in the arc-shaped slot of the escapement slot 121, and the -X sub-board antenna 1 of the middle layer is constrained by the sub-board limit slider 122 and is in a retracted state. When the +X sub-board antenna 3 rotates and unfolds to the secondary unfolding separation angle α (the range of the secondary unfolding separation angle α can be selected: 90°<α<180°, and the secondary unfolding separation angle α selected in this embodiment is 179°), the limit of the arc-shaped slot of the escapement slot 121 ends, the sub-board limit slider 122 slides out of the escapement slot 121, and the -X sub-board antenna 1 starts to rotate and unfold under the spring force of the coil spring 113 of the real axis hinge 11.

[0053] Specifically, the unfolding process of the antenna from the folded state to the unfolded state is as follows:

[0054] Phase 1: The antenna's compression release device 13 is unlocked and released, and the +X sub-board antenna 3 starts to rotate under the driving action of the virtual axis hinge 12. At this time, the sub-board limit slider 122 slides in the escapement slide groove 121, and the -X sub-board antenna 1 is constrained by the sub-board limit slider 122 and does not start to unfold. When the +X sub-board antenna 3 rotates to 180°, the virtual axis hinge is locked, and the +X sub-board antenna 3 unfolds in place. Figure 7 shown.

[0055] The second stage: when the +X sub-board antenna 3 rotates and unfolds to the secondary unfolding separation angle α, the sub-board limit slider 122 slides out of the escapement slide slot 121, and the -X sub-board antenna 1 is released from the constraint restriction. It starts to rotate and unfold under the drive of the real axis hinge 11. When the -X sub-board antenna 1 rotates to 180°, the real axis hinge 11 is locked, and the -X sub-board antenna 1 is unfolded into place. Figure 8 shown.

[0056] Preferably, the present invention can also select a real axis hinge as the unfolding driving device of the +X sub-board antenna. When the real axis hinge is used, the moving block of the real axis hinge is fixedly connected to the +X sub-board antenna, the fixed block is fixedly connected to the middle plate antenna, and the escapement device is fixedly connected to the hinge moving block side. When the -X sub-board antenna is unfolded to reach the separation angle α, the +X sub-board starts to fold and unfold under the drive of the real axis hinge.

[0057] Preferably, the range of the secondary deployment separation angle α that can be selected is 90°<α<180°.

[0058] The design of the present invention has been verified by simulation, product development, and functional test. All functional indicators meet the design requirements and have successfully passed various reliability tests.

Claims

1. An embracing, folded satellite-borne phased array antenna structure, characterized in that: Along the antenna azimuth direction, there are three sub-board antennas of the same size, which are -X sub-board antenna, middle-board antenna and +X sub-board antenna according to the direction of the antenna coordinate system. Each sub-board antenna is completely consistent in structure and composition. The sub-board antennas realize the interconnection of various component modules through a multifunctional integrated mounting plate. There is a connecting structure between adjacent sub-board antennas, and each sub-board antenna is flattened and folded into a "straight line" in an embracing folding form through the connecting structure; or each sub-board antenna is folded and unfolded in stages through the connecting structure, and the antenna is unfolded in stages by mechanical triggering.

2. The embracing type foldable satellite-borne phased array antenna structure according to claim 1, characterized in that: The structure of the sub-board antenna adopts a layered design. Perpendicular to the direction of the mounting board surface, the structure of the sub-board antenna is divided into four layers. The first layer includes a waveguide array, the second layer includes a RF transceiver component, the third layer includes an integrated mounting board, and the fourth layer includes a wave control power supply module, a delay amplification component, a RF power divider module, and a high and low frequency cable network. The mechanical connection between the layers is achieved through the mounting interface of the integrated mounting board, and the electrical interconnection is achieved through high and low frequency blind plug-in.

3. The foldable satellite-borne phased array antenna structure according to claim 2, characterized in that: The radiation waveguide array and the RF transceiver component are fixedly connected to the front of the integrated mounting plate, and the wave control power supply module, the delay amplifier component, and the RF power divider module are fixedly connected to the back of the integrated mounting plate; the input port of the radiation waveguide array and the RF end branch port of the RF transceiver component are blindly connected through SMP-KK, the RF main port of the RF transceiver component is interconnected with the RF branch port of the delay amplifier component, the low-frequency control port of the wave control power supply module is interconnected with the control port of the RF transceiver component, and the RF ports of the delay amplifier component and the RF power divider module are respectively interconnected with the high-frequency port of the RF transceiver component.

4. The embracing and folding satellite-borne phased array antenna structure according to claim 2, characterized in that: The mechanical triggering form is to set up an escapement device to control the staged deployment of the antenna. The escapement device includes an escapement slot and a sub-board limit slider. The escapement slot is fixedly connected to the driving rod of the virtual axis hinge, and the sub-board limit slider is fixed on the side of the -X sub-board antenna. The protrusion at the lower end of the sub-board limit slider cooperates with the escapement slot to realize sliding.

5. The embracing and folding satellite-borne phased array antenna structure according to claim 1, characterized in that: The connection structure includes a virtual axis hinge and a real axis hinge. When the antenna is in a folded state, the -X sub-board antenna, the middle board antenna, and the +X sub-board antenna are embraced, folded and bent by the virtual axis hinge and the real axis hinge, and the antenna is in a "straight line" state; the fixed end of the real axis hinge is fixedly connected to the edge of the middle board antenna, and the movable end of the real axis hinge is fixedly connected to the edge of the +X sub-board antenna; the fixed end of the virtual axis hinge is fixedly connected to the edge of the middle board antenna, and the movable end of the virtual axis hinge is fixedly connected to the edge of the -X sub-board antenna; along the direction perpendicular to the board surface, the +X sub-board antenna is placed on the top layer, the -X sub-board antenna is placed on the middle layer, and the middle board antenna is placed on the bottom layer.

6. The embracing and folding satellite-borne phased array antenna structure according to claim 5, characterized in that: The three sub-board antennas are clamped and fixed by six evenly distributed clamping and releasing devices to keep the antennas in a folded state and prevent the driving hinges from driving the sub-board antennas to rotate.

7. The embracing and folding satellite-borne phased array antenna structure according to claim 5, characterized in that: A coil spring is arranged outside the central axis of rotation of the hinge as a driving force source, and a damper is arranged at the fixed end of the hinge to suppress the faster rotation speed during the unfolding of the antenna.

8. A method for folding and unfolding an embracing type foldable satellite-borne phased array antenna structure according to any one of claims 1 to 7, characterized in that: The phased array antenna deployment is divided into two stages using a hierarchical, sequential, and phased deployment method: in the first stage, the +X sub-board antenna placed on the top layer is deployed; In the second stage, the -X sub-board antenna placed in the middle layer will be unfolded.

9. The folding and unfolding method according to claim 8, characterized in that: An escapement device is provided to control the unfolding of the antenna, the escapement device comprises an escapement slide groove and a sub-board limiting slider, the escapement slide groove is fixedly connected to the driving rod of the virtual axis hinge; the sub-board limiting slider is fixed on the side of the -X sub-board antenna; in the first stage of unfolding, the sub-board limiting slider slides in the escapement slide groove, and the middle layer -X sub-board antenna is constrained by the sub-board limiting slider and is in a retracted state; when the +X sub-board antenna rotates and unfolds to the secondary unfolding separation angle α, the sub-board limiting slider slides out of the escapement slide groove, and the -X sub-board antenna starts to rotate and unfold under the drive of the real axis hinge.

10. The folding and unfolding method according to claim 9, characterized in that: The range of the secondary deployment separation angle α is 90°<α<180°.

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