A high-precision multi-feed translation switching device for compact range

Abstract

The present application relates to the technical field of multi-channel compact range antenna test system, and discloses a compact range high-precision multi-feed source translation switching device, which comprises a translation mechanism, a support frame and a feed source support, the support frame top platform is provided with the feed source support, the translation mechanism adopts ball screw transmission, the side is provided with a range finder and an induction block as a phase center positioning auxiliary, and the mounting position on the feed source support covers different frequency feed sources. The device automatically switches full-band P~Ka feed sources through process control translation shaft movement, and through multi-dimensional adjustment of the fine adjustment mechanism and the polarization shaft, the wide-band coverage and high test precision requirements in complex scenes are met, and the device is suitable for multi-channel parallel test scenes.

Description

Technical Field

[0001] This invention relates to the field of compact field antenna testing system technology, and in particular to a compact field high-precision multi-feed source translation switching device suitable for multi-channel testing. Background Technology

[0002] The compact anechoic chamber uses a parabolic reflector to convert spherical waves into plane waves, simulating a far-field testing environment. The feed, acting as a transmitting or receiving antenna, has its position and type crucial to the test results. To meet wide-band testing requirements, a single feed cannot cover all test frequencies; multiple feeds must be used. Traditional manual feed switching suffers from complex replacement operations, impacting testing efficiency. Furthermore, manual feed switching may result in significant mechanical positioning deviations, affecting test accuracy.

[0003] To improve efficiency, accuracy, and reliability, and to achieve automated configuration, automatic feed switching devices offer significant advantages. Patent CN110133327A proposes a linear compact field feed automatic switching system and method. This system uses a sliding base plate on a frame, on which multiple speaker brackets carrying feeds of different frequency bands are installed at intervals. A linear drive mechanism aligns the feeds with the absorbing material holes, and extension, pitch, and rotation mechanisms adjust the feed position. This achieves fully automated feed replacement, improving testing efficiency and accuracy. However, this solution requires multiple feeds of similar size to fit the same absorbing material holes. If the feeds have significant size differences due to large frequency band variations, this solution is not suitable.

[0004] Patent CN117878592A proposes an automated feed switching device for compact field testing. It employs a dual-rotor design integrating two feed systems. Through rotation, forward / backward, and left / right multi-axis drive components, it achieves automatic feed switching and precise adjustment to the center of the compact field, enabling independent transmission and reception testing. The two feed systems can cover different frequency bands, and with the help of absorbing baffles to suppress interference, it significantly improves testing efficiency and accuracy, solving the problems of low automation and cumbersome positioning in traditional single-feeder switching. However, this solution relies on the control algorithm for positioning accuracy, does not involve sensor feedback, and only relies on single-machine open-loop control. Long-term use may lead to positioning deviations due to screw wear, affecting testing accuracy. Furthermore, this design only supports independent transmission and reception for two systems and is not applicable to three-channel or higher usage scenarios. Summary of the Invention

[0005] To address the testing requirements of large-scale, compact anechoic chambers with wide bandwidth and multiple channels, a high-precision multi-feed source translation switching device for compact anechoic chambers is provided. This device enables parallel testing of multiple channels and is equipped with sensor positioning feedback, thereby improving positioning accuracy.

[0006] This invention is achieved through the following scheme:

[0007] A high-precision multi-feed source translation switching device for a compact field includes a translation mechanism at the bottom, a support frame supported on the translation mechanism, and multiple feed source brackets arranged in a straight line on the equipment platform of the support frame, with feed source mounting surfaces arranged on the same side of the multiple feed source brackets.

[0008] The translation mechanism includes a base and a translation platform. A guide rail is installed on the base, and the guide rail contacts the bottom slider of the translation platform. The translation platform moves along the guide rail via a translation shaft. The translation shaft includes a ball screw and a drive assembly connected to one end of the ball screw. The drive assembly is equipped with a sensor to provide feedback on the rotation angle and triggering accuracy of the final stage. The drive assembly of the translation mechanism is electrically connected to a controller. The controller moves accordingly based on the installation position of different feeds on the feed bracket to adjust the relative position of single or dual feeds and the focal point of the reflector.

[0009] Furthermore, the translation mechanism is also equipped with a laser rangefinder and multiple rangefinder sensing blocks. The sensing blocks are arranged on the side of the translation platform along the moving direction of the translation mechanism. The laser rangefinder is set on the base and faces the sensing blocks on the same side. Each sensing block corresponds to a set of feed source phase centers. The laser rangefinder collects multiple sets of feed source phase center position data.

[0010] Furthermore, the back side of the feed bracket is integrated with and sealed to the upper part of the support frame, and the two side panels of the support frame in the direction of movement are respectively provided with air inlets and air outlets.

[0011] Furthermore, the translation mechanism achieves multiple limits through the coordination of software, electrical and mechanical structures; among them, the translation mechanism is equipped with a software limit program to issue a stop command when the translation mechanism reaches the preset position; a limit switch is fixed on the base; the mechanical limit includes bearing seats located at both ends of the ball screw, which force the stop by contacting the screw nut with the bearing seats.

[0012] Furthermore, the feed bracket includes a base plate and an upper inclined plate. The base plate is installed on the equipment platform to form a bracket mounting surface. The inclined plate is used to place the wave-absorbing baffle and install the feed. The inclined plates of multiple feed brackets all face the same side to form a feed mounting surface.

[0013] Furthermore, the bracket mounting surface includes a bracket base plate, a middle partition plate, and a lower pad plate. A fine-tuning mechanism is provided on the bracket mounting surface, and an adjustment block is provided on the back side of the bracket mounting surface for adjusting the fine-tuning mechanism.

[0014] Furthermore, the fine-tuning mechanism includes an azimuth centering shaft, a translation guide column, a lifting adjustment rod, and an azimuth adjustment arc groove. The lifting adjustment rod passes through the base plate, the middle partition plate, and the lower pad plate of the support. The lifting and fine-tuning of the feed support is achieved by adjusting the nut on the lead screw.

[0015] Furthermore, there are five feed brackets and feed mounting positions on the equipment platform, with at least two feed brackets equipped with feed polarization turntables; the feed mounting positions are designated as the first mounting position, the second mounting position, the third mounting position, the fourth mounting position, and the fifth mounting position, covering feeds of different frequencies from the P-band to the Ka-band.

[0016] Furthermore, the feed source installed in the first mounting position is... f 0~2.67 f 0-bandwidth feed; the feed installed in the second mounting position is 2.67. f 0~6.67 f 0 broadband feeder; the feeder installed at the third mounting position is for coverage. f 1-9 f 1. Four pairs of broadband feeds; the feed installed in the fourth mounting position is 9. f 1~20 f 1. Broadband feeder.

[0017] Furthermore, the feed polarization turntable is mounted on the feed support and includes a feed polarization motor, a reducer, and a feed polarization sensor. A polarization synchronization module and a drive module are installed inside the cylindrical base, and the feed polarization sensor is coaxially mounted with the polarization turntable.

[0018] Furthermore, multiple height adjusters are installed between the base and the foundation.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] The feed shifting and switching device ensures that a single combination can cover the key frequency band and supports... f 0 ~9f The system supports parallel testing across three channels / bands, reducing the number of steps required for feed source switching. Feed source positions can be remotely and electrically adjusted according to testing needs, allowing for flexible switching between different feed source combinations. The feed source mounting surface is divided into five focal areas, each symmetrically distributed along the horizontal line from the center of the feed array. This ensures that the phase center of the single / dual feed source is located at the focal point of the reflector surface. The feed source positions can be remotely and electrically adjusted according to testing needs, allowing for flexible switching between different feed source combinations.

[0021] Below the device is a high-precision translation mechanism. The controller moves the device accordingly based on the different feed installation positions on the feed bracket, adjusting the relative position of the single / dual feed and the focal point of the reflector. The fully automated operation reduces manual intervention and errors. Combined with an absorbing baffle to suppress interference signals, this device meets the requirements for wideband coverage and high testing accuracy in complex scenarios, is suitable for multi-channel parallel testing, and significantly improves the efficiency of compact field testing. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of the multi-feed source translation switching device of the present invention;

[0023] Figure 2 This is a schematic diagram of the translation mechanism structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the feed source mounting position of the present invention;

[0025] Figure 4 This is a schematic diagram showing the position layout of the fine-tuning mechanism for the feed bracket installation of the present invention;

[0026] Figure 5 This is a schematic diagram of the feed support and feed polarization turntable structure of the present invention;

[0027] Figure label:

[0028] 100-Translation mechanism; 101-Base; 102-Translation platform; 103-Lead screw; 104-Reducer; 105-Sensor; 106-Drag chain; 107-Laser rangefinder; 108-Sensing block; 109-Height adjuster;

[0029] 200 - Support frame; 201 - Air inlet; 202 - Air outlet; 203 - Equipment platform;

[0030] 300-Feed bracket; 310-Bracket mounting surface; 311-Bracket base plate; 312-Intermediate partition plate; 313-Lower pad plate; 314-Azimuth centering shaft; 315-Translation guide column; 316-Lifting adjustment rod; 317-Azimuth adjustment arc groove; 318-Adjusting block; 318a-Azimuth adjustment bolt; 318b-Translation adjustment bolt; 320-Feed mounting surface; 321-Immersing baffle; 322-Feed;

[0031] 401 - First mounting position; 402 - Second mounting position; 403 - Third mounting position; 404 - Fourth mounting position; 405 - Fifth mounting position;

[0032] 500 - Feed polarization turntable; 501 - Feed polarization motor; 502 - Transmission reducer; 503 - Feed polarization sensor. Detailed Implementation

[0033] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0034] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1-5 As shown, a high-precision multi-feed source translation switching device for a compact field is provided, which mainly consists of three parts: translation mechanism 100, support frame 200 and feed bracket 300. The translation mechanism 100 is installed on the base 101, the support frame 200 is fixed on the translation mechanism 100, the top of the support frame 200 is provided with an equipment platform 203, and the feed bracket 300 is installed on the equipment platform 203.

[0039] A height adjuster is provided between the foundation and the base 101, which allows the height of the base 101 to be raised or lowered, achieving overall height adjustment within a range of ±80mm.

[0040] The support frame 200 houses the internal cabinet, which contains the equipment controller chassis and corresponding RF components. The support frame 200 is constructed from a single welded steel pipe, heat-treated to remove welding stress, and the sealing plate is made of steel plate covering the frame to form a sealed support cabinet. The air conditioning inlet 201 and outlet 202 are respectively located on the left and right side sealing plates, introducing low-temperature air through air conditioning ducts to effectively dissipate heat and cool the control cabinet and multiple feed sources. Meanwhile, to facilitate the maintenance of the control cabinet and the wiring of the feed sources, the feed source mounting surface 320 has instrument and equipment mounting holes, and the equipment platform 203 is equipped with cable holes and module device mounting plates. The back side of the feed source bracket 300 is integrated with and sealed to the upper part of the support frame 200. Both the back sealing plate of the support frame 200 corresponding to the control cabinet position and the back sealing plate of the feed source bracket 300 have doors.

[0041] like Figure 1 , Figure 2As shown, the translation mechanism 100 includes a base 101 and a translation platform 102. A guide rail is mounted on the base 101, and the guide rail contacts the bottom slider of the translation platform 102. The translation platform 102 moves along the guide rail via a translation shaft. A drag chain 106 connects the translation platform 102 and the translation shaft. The translation shaft uses a ball screw 103 in conjunction with a linear guide rail for transmission. One end of the ball screw 103 is connected to a reducer 104, which is driven by a servo motor in conjunction with the precision reducer 104, causing the ball screw 103 to rotate and thus move the translation platform 102 left and right. The reducer 104 is equipped with a sensor 105 for feedback on the final stage rotation angle and trigger accuracy. The translation mechanism controller is electrically connected to the drive assembly. The controller controls the translation shaft to move accordingly based on the installation position of different feeds on the feed bracket, used to adjust the relative position of single and dual feeds and the focal point of the reflector.

[0042] The feed phase center switching method is as follows: the photoelectric encoder is used as the sensor 105 for the final stage translation. The internal controller of the translation mechanism collects the photoelectric encoder position information and converts it into length information. After receiving each preset position, it will determine the distance and move. After reaching the position, it will decelerate and make a second determination, and make a small movement. The process ends after reaching the control position.

[0043] The load borne by the translation mechanism 100 mainly includes the weight of the upper structural components, antenna, and cabinet. The total error of the translation mechanism of this invention is approximately 0.013mm, achieving high precision requirements. Specifically, the total weight of the structural components and antenna is approximately 3000kg, and the total weight of the two sets of cabinets and other auxiliary equipment is considered to be 500kg. A servo motor with a power of 1000W, a rated torque of 4.77Nm, and a rated speed of 2000rpm is preferred. The reducer 104 uses a high-precision double-lead worm gear reducer with an accuracy of 1 arc minute and a rated torque of 245Nm. The ball screw 103 adopts a double-nut structure, extending its fit with the screw. Preload is increased during manufacturing and installation, ensuring that the repeatability of the ball screw 103 is better than 0.02mm. The dual-lead worm gear reducer can ideally be adjusted to zero backlash. A large-diameter ball screw 103 with a lead of 50mm and a precision ≤1 arc minute is used for transmission. The screw 103 is lengthened with double nuts, and preload is added during manufacturing and installation, achieving a positioning accuracy of 0.013mm. The reducer 104 has a transmission accuracy of 1 / 60 = 0.0167°, which translates to a linear accuracy of 50 / 360 × 0.0167 = 0.002319mm. Therefore, the reducer 104 has minimal impact on the positioning accuracy of the translation axis, and its influence on the translation axis's accuracy can be ignored. Thus, the accuracy of the translation mechanism 100 is mainly limited by the transmission accuracy of the ball screw 103, with a total error of approximately 0.013mm, which already meets high precision requirements.

[0044] like Figure 2 As shown, five rangefinder sensor blocks 108 are fixed to the side of the translation platform 102. The sensor blocks 108 are arranged in a straight line along the moving direction of the translation platform 102 with a certain spacing. A laser rangefinder 107 is fixed on the base 101 on the same side, directly opposite the passing sensor blocks 108. The positions of the five sensor blocks 108 correspond to the phase centers of the five sets of feed sources on the support frame 200. The sensor blocks and rangefinders are installed on the translation mechanism as a backup solution for phase center positioning. During the initial debugging and use, the laser rangefinder 107 collects data on the phase centers of the five sets of feed sources. If the optical encoder fails during the test rotation of the turntable and cannot reach the zero point or accurately position, manual intervention is used to rotate the turntable to the point initially recorded by the laser rangefinder 107. This position is the feed phase center position of the turntable. In addition, after replacing with a new optical encoder, the optical encoder can be set according to this zero point position.

[0045] To ensure the safety of the feeder movement, the translation mechanism 100 is equipped with triple limit protection: software limit, electrical limit, and mechanical limit. Under normal operating conditions, the translation axis operates within the range set by the software. The electrical limit is provided by limit switches on both sides. When the software limit fails, the equipment will trigger the limit switches, and the electrical limit will trigger and send a trigger signal to the drive motor. The motor will stop working, thereby stopping the translation axis and protecting the equipment. If the electrical limit fails, the mechanical limit serves as the final protection. The mechanical limit utilizes the bearing seats on both sides of the lead screw 103. When the lead screw nut contacts the bearing seat, the translation axis is forcibly stopped. Under the premise of meeting the equipment's operating requirements, the three-level limit protection can effectively ensure the safety of the equipment.

[0046] like Figure 3 As shown, this embodiment has five feed brackets 300 and feed mounting positions, namely the first mounting position 401, the second mounting position 402, the third mounting position 403, the fourth mounting position 404, and the fifth mounting position 405. It also includes three polarization axes: the first mounting position 401 has one polarization axis, and the fifth mounting position 405 has two polarization axes. Mounting positions one through five cover feeds of different frequencies from the P-band to the Ka-band. Feed switching from microwave to millimeter-wave bands can be achieved without manual feed replacement through programmable translation axis movement.

[0047] The feed configuration is as follows: the feed installed at the first mounting position 401 is... f 0~2.67 f 0 broadband feed; the feed installed at the second mounting position 402 is 2.67. f 0~6.67 f 0 broadband feeder; the feeder installed at the third mounting position 403 is for coverage. f 1-9 f 1. Four pairs of broadband feeds; the feed installed in the fourth mounting position 404 is 9. f 1~20f 1. Broadband feed; the fifth mounting position 405 can be configured with a specific feed as needed.

[0048] Specifically, in the multi-channel testing mode, the translation device aligns the third mounting position 403 test point with the center of the reflective surface. In this mode, to ensure… f 1-9 f 1. Rapid testing of key frequency bands: corresponding multi-channel sub-band feeds are used, symmetrically distributed along the horizontal line at the center of the feed array. A single combination can cover the key frequency bands, and all use a dual-feed mode.

[0049] like Figure 4 , Figure 5 As shown, in this embodiment, the feed bracket 300 includes a bracket base plate 311 and an upper inclined plate. The bracket base plate 311 is used for bracket installation, and the inclined plate is used to place the wave-absorbing baffle 321 and the feed. The bracket mounting surface 310 consists of three parts: the bracket base plate 311, the intermediate partition plate 312, and the lower pad plate 313. The bracket mounting surface 310 is equipped with fine-tuning mechanisms such as an azimuth centering shaft 314, a translation guide column 315, a lifting adjustment rod 316, and an azimuth adjustment arc groove 317. The lifting adjustment rod 316 passes through the bracket base plate 311, the intermediate partition plate 312, and the lower pad plate 313, and the lifting and fine-tuning of the feed bracket 300 is achieved by adjusting the nut on the lead screw 103.

[0050] The feed bracket 300 and the intermediate partition 312 are bolted together at the azimuth adjustment groove 317. For front-to-back adjustment, simply loosen or tighten the adjusting bolt 318b at the adjusting block, pushing the feed bracket 300 and intermediate partition 312 forward and backward as a whole, thus achieving fine-tuning of the feed's front-to-back position. For azimuth axis adjustment, simply loosen the connecting bolts between the feed bracket 300 and the intermediate partition 312, tighten the azimuth adjustment bolt 318a on the adjusting block 318, and the feed bracket 300 will rotate around the azimuth centering axis 314 of the intermediate partition 312, thereby achieving fine-tuning of the feed's azimuth direction. In summary, after the feed turntable is coarsely positioned, this structure can meet the fine-tuning compensation requirements for each group of feeds in lifting, front-to-back, and azimuth, allowing for more convenient and faster calibration and alignment.

[0051] in, Figure 4 In a specific embodiment of the fine-tuning mechanism's position layout, the center of the bracket mounting surface 310 is set as an azimuth centering shaft 314, translation guide columns 315 are set on both sides of the azimuth centering shaft 314, and lifting adjustment rods 316 are set at the four corners of the base plate. An azimuth adjustment arc groove 317 is set between the translation guide column 315 and the lifting adjustment rod 316.

[0052] like Figure 5As shown, in this embodiment, the feed 322 is mounted on the feed bracket 300. The feed polarization turntable 500 consists of the feed bracket 300, the feed polarization motor 501, the feed polarization sensor 503, and the transmission reducer 502. The polarization drive adopts a hollow rotating platform with a planetary reducer. Polarization synchronization and drive are all located inside the cylindrical base, improving the protection of electrical components and drive parts. The feed antenna base is integrally cast and undergoes failure and heat treatment to prevent deformation after processing, ensuring the machining accuracy of the equipment.

[0053] The feed polarization sensor 503 is mounted on the polarization shaft and employs a high-precision hollow shaft absolute angle encoder. The encoder and polarization shaft are mounted coaxially to eliminate transmission errors introduced by cross-axis mounting. The coaxiality between the encoder and polarization shaft is controlled within 0.02mm using a dial indicator and a four-point elastic connection is used to reduce external forces acting on the encoder in the axial and radial directions, thereby ensuring the encoder's detection accuracy. The encoder's mounting surface is a ground surface with a flatness accuracy of 0.01mm, meeting the sensor's flatness mounting accuracy requirements.

[0054] This invention uses a translation axis to electrically switch to the phase center of each feed array, automatically switching between P-Ka feeds across the entire frequency band. In other words, during use, the translation mechanism 100 moves the required mounting position to the corresponding focal point, thus achieving a multi-feed layout for RCS measurement and solving the focusing problem. The upper polarization axis adjusts the polarization direction of the feed antenna, and the polarization is electrically switched by the radio frequency switch of the radio frequency system to achieve horizontal and vertical polarization switching, thus solving the polarization matching problem.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision multi-feed source translation switching device for a compact field, characterized in that: Includes a bottom translation mechanism (100), on which a support frame (200) is supported. Multiple feed brackets (300) are arranged in a straight line on the equipment platform (203) of the support frame (200). Feed mounting surfaces (320) are arranged on the same side of the multiple feed brackets (300). There are a total of five feed brackets (300) and feed mounting positions on the equipment platform (203). Mounting positions one to five cover feeds of different frequencies from P-band to Ka-band. At least two of the feed brackets (300) are equipped with feed polarization turntables (500). Supports three-channel / frequency band parallel testing. The translation mechanism (100) includes a base (101) and a translation platform (102). A guide rail is provided on the base (101), and the guide rail contacts the bottom slider of the translation platform (102). The translation platform (102) is driven to translate on the guide rail via a translation shaft. The translation shaft includes a ball screw (103) and a drive assembly connected to one end of the ball screw (103). The drive assembly is equipped with a sensor (105). The sensor (105) is located at the final stage of the reducer (104) and uses a photoelectric encoder. The controller internally collects the photoelectric encoder position information, converts it into length information, and performs secondary judgment on the micro-movement to provide feedback on the rotation angle and trigger accuracy of the final stage. The drive assembly of the translation mechanism (100) is electrically connected to the controller. The controller moves its position according to the installation position of different feeds on the feed bracket (300) to adjust the relative position of the single or double feed and the focal point of the reflector. The translation mechanism (100) is also equipped with a laser rangefinder (107) and multiple rangefinder sensing blocks (108) as a backup plan after the optical encoder fails, to provide an initial calibration reference point and to provide a calibration basis for replacing the optical encoder.

2. The high-precision multi-feed source translation switching device for a compact field as described in claim 1, characterized in that, The sensing blocks (108) are arranged on the side of the translation platform (102) along the moving direction of the translation mechanism (100). The laser rangefinder (107) is set on the base (101) and faces the sensing blocks (108) on the same side. Each sensing block (108) corresponds to a set of feed phase centers. The laser rangefinder (107) collects multiple sets of feed phase center position data.

3. The high-precision multi-feed source translation switching device for a compact field as described in claim 1, characterized in that, The back of the feed bracket (300) is connected to the upper part of the support frame (200) and sealed. The two side panels of the support frame (200) in the moving direction are respectively provided with an air inlet (201) and an air outlet (202).

4. The high-precision multi-feed source translation switching device for a compact field as described in claim 1, characterized in that, The translation mechanism (100) achieves multiple limits through the cooperation of software, electrical and mechanical structures; wherein, the translation mechanism (100) is equipped with a software limit program, which is used to issue a stop command when the translation mechanism (100) reaches a preset position; a limit switch is fixed on the base (101); the mechanical limit includes bearing seats at both ends of the ball screw (103), which are forcibly stopped by contact between the screw (103) nut and the bearing seat.

5. The high-precision multi-feed source translation switching device for a compact field as described in claim 1, characterized in that, The feed bracket (300) includes a bracket base plate (311) and an upper inclined plate. The bracket base plate (311) is installed on the equipment table (203) to form a bracket mounting surface (310). A wave-absorbing baffle (321) is placed on the inclined plate and a feed is installed. The inclined plates of multiple feed brackets (300) all face the same side to form a feed mounting surface (320).

6. The high-precision multi-feed source translation switching device for a compact field as described in claim 5, characterized in that, The bracket mounting surface (310) includes a bracket base plate (311), a middle partition plate (312) and a lower pad plate (313). A fine-tuning mechanism is provided on the bracket mounting surface (310), and an adjustment block (318) is provided on the back side of the bracket mounting surface (310) for adjusting the fine-tuning mechanism.

7. The high-precision multi-feed source translation switching device for a compact field as described in claim 6, characterized in that, The fine-tuning mechanism includes an azimuth centering shaft (314), a translation guide column (315), a lifting adjustment rod (316), and an azimuth adjustment arc groove (317). The lifting adjustment rod (316) passes through the support base plate (311), the middle partition plate (312), and the lower pad plate (313). The lifting and fine-tuning of the feed support (300) is achieved by adjusting the nut on the lead screw (103).

8. A high-precision multi-feed source translation switching device for a compact field as described in claim 6 or 7, characterized in that, The feed mounting positions are respectively the first mounting position (401), the second mounting position (402), the third mounting position (403), the fourth mounting position (404), and the fifth mounting position (405), with mounting positions one to five covering feeds of different frequencies from the P-band to the Ka-band.

9. A high-precision multi-feed source translation switching device for a compact field as described in claim 8, characterized in that, The feed installed at the first mounting position (401) is f 0~2.67 f 0 broadband feed; the feed installed at the second mounting position (402) is 2.67 f 0~6.67 f 0 broadband feeder; the feeder installed at the third mounting position (403) is for coverage. f 1-9 f 1. Four pairs of broadband feeds; the feed installed at the fourth mounting position (404) is 9. f 1~20 f 1. Broadband feeder.

10. A high-precision multi-feed source translation switching device for a compact field as described in claim 8, characterized in that, The feed polarization turntable (500) is mounted on the feed bracket (300) and includes a feed polarization motor (501), a transmission reducer (502) and a feed polarization sensor (503). A polarization synchronization module and a drive module are installed in the cylindrical base. The feed polarization sensor (503) is coaxially mounted with the polarization turntable.

11. The high-precision multi-feed source translation switching device for a compact field as described in claim 1, characterized in that, Multiple height adjusters (109) are provided between the base (101) and the foundation.

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