A two-dimensional pointing mechanism for waveguide-type satellite-borne antenna

Abstract

The present invention discloses a two-dimensional pointing mechanism of a waveguide-type satellite-borne antenna, and belongs to the technical field of satellite-borne antennas. The mechanism includes an X-axis drive assembly, a Y-axis drive assembly, an X-axis rotary joint, and a Y-axis rotary joint; the X-axis drive assembly and the Y-axis drive assembly adopt the same structure, including a stepper motor, a harmonic reducer, and a resolver transformer. The X-axis rotary joint and the Y-axis rotary joint are connected by a waveguide to realize radio frequency signal transmission. The present invention uses two sets of dual-channel rotary joints to rotate synchronously with two sets of drive assemblies, thereby avoiding cable entanglement and improving the reliability of the system; the drive assembly adopts a new layout form to optimize the volume and weight of the drive structure.

Description

Technical Field

[0001] The invention relates to the technical field of satellite-borne antennas, and in particular to a two-dimensional pointing mechanism of a waveguide-type satellite-borne antenna. Background Art

[0002] The satellite-borne antenna is one of the main payloads of the satellite, with functions such as remote control and telemetry, satellite-to-ground data transmission, and inter-satellite communication. The two-dimensional pointing mechanism of the satellite-borne antenna that realizes the movement and pointing of the antenna needs to have adaptability to various space environments.

[0003] In the two-dimensional pointing mechanism of satellite-borne antenna in the prior art, radio frequency cables are mostly used for signal transmission, which will cause great loss to high-frequency signals. At the same time, in terms of driving form, motors, reducers, angle measuring encoders and other components are mostly connected in series as independent units, and elastically connected by shaft couplings or couplings. This method causes the pointing mechanism to be heavy and large in size. In addition, due to the increase in connection links, the reliability of the mechanism is reduced. Summary of the invention

[0004] In view of this, the present invention provides a two-dimensional pointing mechanism for a waveguide-type satellite-borne antenna, which reduces high-frequency signal loss and improves mechanism reliability.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A two-dimensional pointing mechanism for a waveguide-type satellite-borne antenna comprises an X-axis rotating mechanism and a Y-axis rotating mechanism connected to an output shaft of the X-axis rotating mechanism, wherein the axis of the X-axis rotating mechanism is orthogonal to the axis of the Y-axis rotating mechanism, the X-axis rotating mechanism comprises an X-axis driving assembly and an X-axis rotating bracket, and the Y-axis rotating mechanism comprises a Y-axis driving assembly and a Y-axis rotating bracket; a rotating joint having a radio frequency channel is installed at the shaft end of the output shaft of the X-axis driving assembly and the shaft end of the output shaft of the Y-axis driving assembly;

[0007] The rotary joints each include a stationary end and a rotating end; the stationary end of the Y-axis rotary joint is connected to the rotating end of the X-axis rotary joint via a waveguide, and ports are extended from the rotating end of the Y-axis rotary joint and the stationary end of the X-axis rotary joint.

[0008] Furthermore, the radio frequency channel of the rotary joint is a dual radio frequency channel, which includes two stationary ends and two rotating ends; the two stationary ends of the Y-axis rotary joint are respectively connected to the two rotating ends of the X-axis rotary joint through waveguides.

[0009] Furthermore, the X-axis drive assembly and the Y-axis drive assembly each include a stepper motor, a harmonic reducer and a rotary transformer for measuring a rotation angle; the front end of the drive shaft of the stepper motor is connected to the output shaft via the harmonic reducer, and the rear end of the drive shaft is connected to the rotary transformer.

[0010] Furthermore, the stepper motor is a split stepper motor; the harmonic reducer is a harmonic reducer assembly; and the rotary transformer is a split rotary transformer.

[0011] The beneficial effects of the above technical solution of the present invention are:

[0012] 1. The present invention adopts waveguide form to transmit radio frequency signals, which reduces transmission loss and improves the efficiency and gain of the antenna.

[0013] 2. The two sets of dual-RF channel rotating joints of the present invention realize synchronous rotation with the two sets of driving components, thus avoiding cable entanglement and improving the reliability of the system.

[0014] 3. The drive assembly of the present invention adopts a stepper motor, a harmonic reducer and a rotary transformer, and these components optimize the volume and weight of the drive structure through a new layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the middle X-axis bracket.

[0017] Figure 3 yes Figure 1 Schematic diagram of the structure of the X-axis drive assembly.

[0018] Figure 4 for Figure 1 Schematic diagram of the middle Y-axis bracket structure.

[0019] Figure 5 for Figure 1 Schematic diagram of the X-axis rotation joint structure.

[0020] Figure 6 It is a block diagram of the working principle of the present invention.

[0021] Figure 7 The figure is a schematic diagram of the application of an embodiment of the present invention on a satellite-borne antenna.

[0022] In the figure: 1. X-axis rotating bracket, 2. X-axis driving assembly, 3. Y-axis rotating bracket, 4. Y-axis driving assembly, 5. reflector connecting flange, 6. Y-axis rotating joint, 7. X-axis rotating joint, 9. waveguide, 12. stationary end, 13. rotating end, 16. housing, 17. split stepper motor, 18. driving shaft, 19. harmonic reducer assembly, 20. output shaft, 25. driving shaft, 26. split rotating transformer. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] A two-dimensional pointing mechanism for a waveguide-type satellite-borne antenna comprises an X-axis rotating mechanism and a Y-axis rotating mechanism connected to an output shaft 20 of the X-axis rotating mechanism, wherein the axis of the X-axis rotating mechanism is orthogonal to the axis of the Y-axis rotating mechanism, the X-axis rotating mechanism comprises an X-axis driving assembly and an X-axis rotating bracket, and the Y-axis rotating mechanism comprises a Y-axis driving assembly and a Y-axis rotating bracket; a rotating joint having a radio frequency channel is installed at the shaft end of the output shaft of the X-axis driving assembly and the shaft end of the output shaft of the Y-axis driving assembly;

[0025] The rotary joints each include a stationary end and a rotating end; the stationary end of the Y-axis rotary joint is connected to the rotating end of the X-axis rotary joint via a waveguide, and ports are extended from the rotating end of the Y-axis rotary joint and the stationary end of the X-axis rotary joint.

[0026] Furthermore, the radio frequency channel of the rotary joint is a dual radio frequency channel, which includes two stationary ends and two rotating ends; the two stationary ends of the Y-axis rotary joint are respectively connected to the two rotating ends of the X-axis rotary joint through waveguides.

[0027] Furthermore, the X-axis drive assembly and the Y-axis drive assembly each include a stepper motor, a harmonic reducer and a rotary transformer for measuring a rotation angle; the front end of the drive shaft of the stepper motor is connected to the output shaft via the harmonic reducer, and the rear end of the drive shaft is connected to the rotary transformer.

[0028] Furthermore, the stepper motor is a split stepper motor; the harmonic reducer is a harmonic reducer assembly; and the rotary transformer is a split rotary transformer.

[0029] The following is a more specific embodiment:

[0030] like Figure 1 As shown, this embodiment includes an X-axis rotating bracket 1 and an X-axis driving assembly 2, which are connected to a Y-axis driving assembly 4 via a Y-axis rotating bracket 3. The X-axis rotating bracket and the Y-axis rotating bracket are orthogonally distributed. The output end of the Y-axis driving assembly is connected to a reflector connecting flange 5, thereby achieving connection with the reflector of the antenna.

[0031] The shaft end of the X-axis drive assembly is equipped with an X-axis rotary joint 7, and the shaft end of the Y-axis drive assembly is equipped with a Y-axis rotary joint 6. Both sets of rotary joints have dual radio frequency channels, which can realize the transmission of dual-path radio frequency signals. The two sets of rotary joints are connected by a waveguide 9 of the dual radio frequency channels.

[0032] The dual radio frequency channels of the rotary joint include two stationary ends 12 and two rotating ends 13 .

[0033] The stationary end of the Y-axis rotation joint is connected to the rotating end of the X-axis rotation joint through a waveguide, and ports are extended from the rotating end of the Y-axis rotation joint and the stationary end of the X-axis rotation joint.

[0034] Through the stationary end of the X-axis rotation joint, two sets of rotation joints transmit the RF signal to the inside of the satellite platform.

[0035] like Figure 2 Shown is a schematic diagram of an X-axis bracket, which is used to support the X-axis drive assembly.

[0036] like Figure 3 The figure shows the internal components of the X-axis / Y-axis drive assembly. The X-axis / Y-axis drive assembly consists of a stepper motor 17, a harmonic reducer assembly 19, an angular resolver 26, etc., and is covered with a housing 16 on the outside. The stepper motor is connected to the harmonic reducer assembly through a drive shaft 18 to achieve deceleration and torque boost, and the end of the harmonic reducer is connected to the output shaft 20 to achieve torque output. At the same time, two sets of bearings are arranged between the output shaft and the housing 16 to achieve the rotation support function.

[0037] The output shaft is connected to the split rotary transformer 26 through the drive shaft 25, so that the rotary transformer detects the rotation angle information of the mechanism. The end of the central axis of the drive component is supported on the housing through a bearing, thereby achieving the coaxiality requirement of the rotational motion.

[0038] like Figure 4 The figure shows a schematic diagram of a Y-axis bracket, which is used to connect the X-axis drive assembly and the Y-axis drive assembly and arrange the two drive assemblies orthogonally.

[0039] like Figure 5 The figure shows a schematic diagram of an X-axis or Y-axis rotary joint. The X-axis or Y-axis rotary joint rotates synchronously with the X-axis or Y-axis drive assembly. It is divided into two left and right RF signal transmission channels. The upper part is the input flange of the RF channel, and the lower part is the output flange of the RF channel. Using waveguide for RF signal transmission can reduce signal loss.

[0040] like Figure 6 As shown, the working principle block diagram of this embodiment. The satellite control unit issues a control instruction to realize the movement and pointing function of the antenna reflector through the X-axis drive component and the Y-axis drive component. At the same time, the angle information of the pointing mechanism is detected through the X-axis rotary transformer and the Y-axis rotary transformer. The reception and transmission of radio frequency signals are realized through the X-axis rotary joint and the Y-axis rotary joint.

[0041] like Figure 7 As shown, the application schematic diagram of this embodiment on the satellite-borne data transmission antenna, the front end of the two-dimensional pointing mechanism is the antenna reflector. The satellite-borne data transmission antenna is in the transmitting state, and the two-dimensional pointing mechanism is in the stowed state.

Claims

1. A two-dimensional pointing mechanism for a waveguide-type satellite-borne antenna, comprising an X-axis rotation mechanism and a Y-axis rotation mechanism connected to an output shaft (20) of the X-axis rotation mechanism, wherein the axis of the X-axis rotation mechanism is orthogonal to the axis of the Y-axis rotation mechanism, and characterized in that: The X-axis rotation mechanism comprises an X-axis drive assembly (2) and an X-axis rotation bracket (1), and the Y-axis rotation mechanism comprises a Y-axis drive assembly (4) and a Y-axis rotation bracket (3); a rotation joint having a radio frequency channel is installed at the shaft end of the output shaft of the X-axis drive assembly and the shaft end of the output shaft of the Y-axis drive assembly; The rotary joints each comprise a stationary end (12) and a rotating end (13); the stationary end (12) of the Y-axis rotary joint is connected to the rotating end of the X-axis rotary joint via a waveguide (9), and the rotating end of the Y-axis rotary joint and the stationary end of the X-axis rotary joint both extend with ports; the radio frequency channel of the rotary joint is a dual radio frequency channel, comprising two stationary ends and two rotating ends; the two stationary ends of the Y-axis rotary joint (6) are respectively connected to the two rotating ends of the X-axis rotary joint (7) via a waveguide; the X-axis drive assembly and the Y-axis drive assembly each comprise a stepping motor, a harmonic reducer, and a rotary transformer for measuring a rotation angle; the front end of the driving shaft (18) of the stepping motor is connected to the output shaft via the harmonic reducer, and the rear end of the driving shaft is connected to the rotary transformer.

2. The two-dimensional pointing mechanism of a waveguide-type satellite-borne antenna according to claim 1, characterized in that: The stepper motor is a split-type stepper motor (17); the harmonic reducer is a harmonic reducer assembly (19); and the rotary transformer is a split-type rotary transformer (26).

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