Low-loss airborne weather radar servo drive platform

Abstract

The present invention discloses a low-loss airborne weather radar servo transmission platform. It includes a pitch transmission unit, an azimuth transmission unit, a base, a transceiver module, an array antenna and a pad. The pitch transmission unit and the azimuth transmission unit are installed on the base, and the transceiver module and the array antenna are blindly plugged and installed on the pitch transmission unit. When the servo transmission platform receives control instructions and data signals, the pitch transmission unit and the azimuth transmission unit drive the array antenna to scan the airspace in the pitch and azimuth dimensions, capture and track the target, and feed back the position angle and speed data to the base in real time for comparison and correction with the expected value, so that the servo transmission platform forms a closed-loop control system. The present invention reduces the volume, weight and total hysteresis of the servo transmission platform, shortens the microwave transmission path, reduces the loss of the whole machine, improves the servo transmission accuracy and control performance, and can be used for the servo transmission control of airborne weather radars of various aircraft.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic equipment, and in particular relates to an airborne weather radar servo transmission platform, which can be used for mechanical scanning control of radar antennas of various aircrafts. Background Art

[0002] The servo drive platform of the airborne meteorological radar is a mechatronic device used by the airborne meteorological radar to search, capture, track, and determine the target's location and various motion parameters. It drives the radar antenna to move in pitch and azimuth according to the motion law given by the radar system, so that the radar can capture and track the target. At the same time, the servo drive platform feeds back the pitch and azimuth angle motion information to the radar system, so that the radar system can accurately determine the target position. When the aircraft makes roll, pitch, yaw and other flight postures during the heading process, in order to ensure that the radar antenna scanning airspace does not change, the servo drive platform drives the radar antenna to move and make corresponding compensation to eliminate the impact of the aircraft's attitude changes.

[0003] Existing airborne weather radar servo drive platforms mostly use motor-gearbox or motor-direct drive transmission. The gearbox is generally a multi-stage fixed-axis gear transmission. The multi-stage fixed-axis gearbox with a large transmission ratio is large in size, heavy in weight, has poor transmission accuracy, and a large total backlash. Although the motor-direct drive transmission method eliminates the intermediate reduction mechanism, it requires the use of a high-torque motor, which has a large outer size and requires a larger space to install. At the same time, since the transceiver module and radar antenna of the airborne weather radar are often used as two extensions and cannot be installed close together, the transmission path distance and loss are increased. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and propose a low-loss airborne weather radar servo transmission platform to reduce the volume of the servo transmission platform, reduce the weight and total backlash, improve the servo transmission accuracy and control performance, shorten the microwave transmission path, and reduce the loss of the entire machine.

[0005] The technical idea of ​​the present invention is: by adopting a transmission mode of a brushless DC servo motor plus a planetary reducer and a primary reduction gear pair to drive the radar antenna to move in pitch and azimuth according to a given law, and by adopting a closed-loop control to accurately control the motion parameters; by adopting a waveguide blind plug connection mode between the transceiver module and the radar antenna, the microwave transmission path is shortened and the loss of the whole machine is reduced.

[0006] According to the above technical ideas, the low-loss airborne weather radar servo transmission platform of the present invention includes a pitch transmission unit 1, an azimuth transmission unit 2, a base 3, a transceiver module 4, an array antenna 5 and a cushion block 6. The pitch transmission unit 1 and the azimuth transmission unit 2 are installed on the base 3, and the transceiver module 4 and the array antenna 5 are connected and installed on the pitch transmission unit 1. The characteristics are:

[0007] The pitch transmission unit 1 includes a pitch motor 11, a pitch reducer 12, a pitch reduction gear pair 13, a pitch angle potentiometer 14 and a pitch component 15; the pitch motor 11 is a brushless DC servo motor, the pitch reducer 12 is a planetary reducer, the pitch reduction gear pair 13 is a primary gear transmission, and the pitch reducer 12 and the pitch reduction gear pair 13 together form a reduction mechanism of the pitch transmission unit 1.

[0008] The azimuth transmission unit 2 includes an azimuth motor 21, an azimuth reducer 22, an azimuth reduction gear pair 23, an azimuth angle potentiometer 24, an azimuth component 25, a left fork arm 26, a right fork arm 27 and a drive box 28; the azimuth motor 21 is a brushless DC servo motor, the azimuth reducer 22 is a planetary reducer, the azimuth reduction gear pair 23 is a primary gear transmission, the azimuth reducer 22 and the azimuth reduction gear pair 23 together form a reduction mechanism of the azimuth transmission unit 2, and the left fork arm 26, the right fork arm 27 and the drive box 28 are respectively installed on the base 3.

[0009] The transceiver module 4 is located directly below the array antenna 5 and is installed on the upper end of the servo drive platform. The two are filled with a heat-conducting medium and connected by a waveguide blind plug to shorten the transmission path between the two and reduce the loss of the entire machine.

[0010] Furthermore, the pitch motor 11 and the pitch reducer 12 in the pitch transmission unit 1 are installed on the pitch component 15 with clearance fit, one end of the pitch reduction gear pair 13 is fixed on the pitch component 15, and the other end is fastened to the output shaft of the pitch reducer 12, and the rotation axis of the pitch component 15 is coaxially connected with the rotation axis of the pitch angle potentiometer 14.

[0011] Furthermore, the azimuth motor 21 and the azimuth reducer 22 in the azimuth transmission unit 2 are installed on the azimuth component 25 with clearance fit, one end of the azimuth reduction gear pair 23 is fixed on the azimuth component 25, and the other end is fastened to the output shaft of the azimuth reducer 22. The rotating axis of the azimuth component 25 is coaxially connected with the rotating axis of the azimuth angle potentiometer 24.

[0012] Furthermore, the base 3 adopts an integrated structure with a circular bottom cross-section and an elliptical upper cross-section, and is used as a support for the entire servo transmission platform.

[0013] Furthermore, the clock, intermediate frequency and control signals are transmitted between the transceiver module 4 and the inside of the base 3 through three cables. After being arranged and fixed, the three cables enter the center holes of the rotation axes of the azimuth component 25 and the left fork arm 26 from the center holes of the rotation axes of the pitch component 15, and then enter the inside of the base 3 after being fixed.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention adopts a reduction mechanism of a first-stage gear pair plus a planetary reducer on the pitch transmission unit 1 and the azimuth transmission unit 2, thereby reducing the volume of the servo transmission platform, reducing the weight and total backlash of the servo transmission platform, and improving the accuracy and transmission efficiency of the servo transmission platform.

[0016] 2. In the present invention, the pitch motor 11 in the pitch transmission unit 1 and the azimuth motor 21 in the azimuth transmission unit 2 both adopt brushless DC servo motors. Since brushless DC servo motors have the characteristics of fast response, high speed and small inertia, closed-loop control of the servo transmission is realized, thereby improving the accuracy of the servo transmission platform.

[0017] 3. Since the present invention adopts a waveguide blind plug connection between the transceiver module 4 and the array antenna 5, the microwave transmission path is shortened and the loss of the whole device is reduced.

[0018] 4. The three cables between the transceiver module 4 and the base 3 of the present invention are routed from the rotation axis center hole of the pitch component 15 into the rotation axis center holes of the azimuth component 25 and the left fork arm 26, thereby improving the stress condition of the cables during the platform rotation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall block diagram of the present invention;

[0020] Figure 2 It is the overall structure diagram of the present invention;

[0021] Figure 3 It is a dissected diagram of the pitch transmission unit in the present invention;

[0022] Figure 4 It is a dissected diagram of the azimuth transmission unit in the present invention. DETAILED DESCRIPTION

[0023] The examples of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] Reference Figure 1The servo transmission platform of the present invention comprises a pitch transmission unit 1, an azimuth transmission unit 2, a base 3, a transceiver module 4, an array antenna 5 and a cushion block 6; the pitch transmission unit 1 and the azimuth transmission unit 2 are mounted on the base 3, and the transceiver module 4 and the array antenna 5 are connected and mounted on the pitch transmission unit 1. When a cushion block 6 is added to the contact surface between the azimuth transmission unit 2 and the base 3, the requirement of the rotation range of a large-sized radar antenna can be met. When the servo transmission platform receives control instructions and data signals, the pitch transmission unit 1 and the azimuth transmission unit 2 drive the array antenna 5 to perform airspace scanning in the pitch and azimuth dimensions, thereby capturing and tracking the target. At the same time, the pitch transmission unit 1 and the azimuth transmission unit 2 feed back the angle and speed data to the base 3 in real time for comparison and correction with the expected value, so that the servo transmission platform forms a closed-loop control system.

[0025] Reference Figure 2 , the structural details of this example are described as follows:

[0026] The pitch transmission unit 1 comprises a pitch motor 11, a pitch reducer 12, a pitch reduction gear pair 13, a pitch angle potentiometer 14 and a pitch component 15; the pitch motor 11 is a brushless DC servo motor, the pitch reducer 12 is a planetary reducer, the pitch reduction gear pair 13 is a primary gear transmission, the pitch reducer 12 and the pitch reduction gear pair 13 together form a reduction mechanism of the pitch transmission unit 1, the pitch motor 11 and the pitch reducer 12 are installed on the pitch component 15 with clearance fit, one end of the pitch reduction gear pair 13 is fixed on the pitch component 15, and the other end is fastened to the output shaft of the pitch reducer 12, and the rotation axis of the pitch component 15 is coaxially connected with the rotation axis of the pitch angle potentiometer 14. After the pitch motor 11 is started, it drives the array antenna 5 to move in the pitch dimension according to a given motion law through the pitch reducer 12 and the pitch reduction gear pair 13. The pitch angle potentiometer 14 monitors the pitch angle and speed of the pitch dimension in real time and feeds back the pitch angle and speed information to the base 3 in time to compare with the expected value and make corrections.

[0027] The azimuth transmission unit 2 includes an azimuth motor 21, an azimuth reducer 22, an azimuth reduction gear pair 23, an azimuth angle potentiometer 24, an azimuth component 25, a left fork arm 26, a right fork arm 27 and a drive box 28; the azimuth motor 21 is a brushless DC servo motor, the azimuth reducer 22 is a planetary reducer, the azimuth reduction gear pair 23 is a primary gear transmission, the azimuth reducer 22 and the azimuth reduction gear pair 23 together form a reduction mechanism of the azimuth transmission unit 2, and the azimuth motor 21 and The azimuth reducer 22 is installed on the drive box 28 by using clearance fit, one end of the azimuth reduction gear pair 23 is fixed on the azimuth component 25, and the other end is fastened to the output shaft of the azimuth reducer 22, and the rotation axis of the azimuth component 25 is coaxially connected with the rotation axis of the azimuth angle potentiometer 24; the left fork arm 26 and the right fork arm 27 are symmetrically splayed across the mounting surface of the base 3 in an eight-shaped shape, and are used to realize the connection between the pitch transmission unit 1 and the azimuth transmission unit 2, and the drive box 28 is installed on the base 3. After the azimuth motor 21 is started, the azimuth reducer 22 and the azimuth reduction gear pair 23 drive the array antenna 5 to move in the azimuth dimension according to the given motion law, and the azimuth angle potentiometer 24 monitors the azimuth dimension motion angle and speed in real time and timely feeds back the azimuth angle and speed information to the inside of the base 3 for comparison with the expected value and correction.

[0028] The base 3 is an integrated structure with a circular bottom cross-section and an elliptical upper cross-section, and is used as a support for the entire servo transmission platform.

[0029] The transceiver module 4 is located directly below the array antenna 5, with a heat-conducting medium filled between the two, and is installed on the pitch component 15 after being connected by waveguide blind plugging to shorten the transmission path between the two and reduce the loss of the entire device.

[0030] The clock, intermediate frequency and control signals are transmitted between the transceiver module 4 and the inside of the base 3 through three cables. After being arranged and fixed, the three cables enter the center holes of the rotation axes of the azimuth component 25 and the left fork arm 26 from the center holes of the rotation axes of the pitch component 15, and then enter the inside of the base 3 after being fixed.

[0031] Reference Figure 3 The pitch reduction gear pair 13 includes a pitch reduction gear 131 and a pitch reduction gear 132 .

[0032] The pitch component 15 comprises a pitch bracket 151, an azimuth bracket 152, an end cover 153, a semicircular ring 154, an angular contact bearing 155, a baffle 156 and an adjusting gasket 157; the inner ring of the angular contact bearing 155 is installed on the rotating shafts at the left and right ends of the pitch bracket 151 by interference fit, and is connected to the azimuth bracket 152 through the mounting holes of the semicircular ring 154, the lower half of the outer ring is installed at the corresponding semicircular position of the azimuth bracket 152, and the upper half is installed in cooperation with the semicircular ring 154 to limit the outer ring of the angular contact bearing 155 through shaft shoulder contact, the baffle 156 is installed on the inner ring of the angular contact bearing 155 to prevent the inner ring of the angular contact bearing 155 from axial movement, the adjusting gasket 157 is filled between the baffle 156 and the inner ring of the angular contact bearing 155, and the end cover 153 is installed on the azimuth bracket 152 and the semicircular ring 154.

[0033] The pitch reduction gear 131 is installed with clearance fit with the rotating shaft of the pitch bracket 151 and is fixed on the azimuth bracket 152 through a semicircular ring 154 . The pitch reduction gear 132 is tightly fitted with the output shaft of the pitch reducer 12 .

[0034] Reference Figure 4 .The azimuth reduction gear pair 23 includes an azimuth reduction gear 231 and an azimuth reduction gear 232.

[0035] The orientation component 25 includes an end cover 251, an angular contact bearing 252, a baffle 253, an adjusting gasket 254 and an orientation bracket 255; the inner ring of the angular contact bearing 252 is installed on the rotating shafts at the left and right ends of the orientation bracket 255, and the outer ring is installed in the corresponding holes of the left fork arm 26 and the right fork arm 27 with an interference fit to limit the outer ring of the angular contact bearing 252 through shoulder contact, the baffle 253 is installed on the inner ring of the angular contact bearing 252 to prevent the inner ring of the angular contact bearing 252 from axial movement, the adjusting gasket 254 is filled between the baffle 253 and the inner ring of the angular contact bearing 252, and the end cover 251 is installed on the left fork arm 26 and the right fork arm 27.

[0036] The azimuth reduction gear 231 is positioned and mounted on the azimuth bracket 255 , and the centers of the rotation axes of the two coincide with each other. The azimuth reduction gear 232 is tightly connected to the output shaft of the azimuth reducer 22 .

[0037] The above description is only a specific example of the present invention and does not constitute any limitation to the present invention. It is obvious that for professionals in this field, after understanding the content and principles of the present invention, it is possible to make various modifications and changes in form and details without departing from the principles and structures of the present invention. However, these modifications and changes based on the ideas of the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. A low-loss airborne weather radar servo drive platform, comprising: A pitch transmission unit (1), an azimuth transmission unit (2), a base (3), a transceiver module (4), an array antenna (5) and a cushion block (6); the pitch transmission unit (1) and the azimuth transmission unit (2) are mounted on the base (3), and the transceiver module (4) and the array antenna (5) are connected and then mounted on the pitch transmission unit (1), characterized in that: The pitch transmission unit (1) comprises a pitch motor (11), a pitch reducer (12), a pitch reduction gear pair (13), a pitch angle potentiometer (14) and a pitch component (15); the pitch motor (11) is a brushless DC servo motor, the pitch reducer (12) is a planetary reducer, the pitch reduction gear pair (13) is a primary gear transmission, and the pitch reducer (12) and the pitch reduction gear pair (13) together form a reduction mechanism of the pitch transmission unit (1); The azimuth transmission unit (2) comprises an azimuth motor (21), an azimuth reducer (22), an azimuth reduction gear pair (23), an azimuth angle potentiometer (24), an azimuth component (25), a left fork arm (26), a right fork arm (27) and a drive box (28); the azimuth motor (21) is a brushless DC servo motor, the azimuth reducer (22) is a planetary reducer, the azimuth reduction gear pair (23) is a primary gear transmission, the azimuth reducer (22) and the azimuth reduction gear pair (23) together form a reduction mechanism of the azimuth transmission unit (2), and the left fork arm (26), the right fork arm (27) and the drive box (28) are respectively mounted on the base (3); The transceiver module (4) is located directly below the array antenna (5) and is installed on the upper end of the servo drive platform. A heat-conducting medium is filled between the two, and the two are blindly connected via waveguides to shorten the transmission path between the two and reduce the loss of the entire device. The pitch reduction gear pair (13) comprises a first pitch reduction gear (131) and a second pitch reduction gear (132); The pitch component (15) comprises a first pitch bracket (151), a first azimuth bracket (152), a first end cover (153), a semicircular ring (154), a first angular contact bearing (155), a first baffle (156) and a first adjustment gasket (157); the first angular contact bearing (155) has an inner ring installed on the left and right rotating shafts of the first pitch bracket (151) by interference fit, and is connected to the first azimuth bracket (152) through the mounting hole of the semicircular ring (154); and the lower half of the outer ring is installed on the first azimuth bracket (152). The upper half is mounted in cooperation with the semicircular ring (154) at a corresponding semicircular position of the first angular contact bearing (155) to limit the outer ring of the first angular contact bearing (155) through axial shoulder contact; the first baffle (156) is mounted on the inner ring of the first angular contact bearing (155) to prevent the inner ring of the first angular contact bearing (155) from axial movement; the first adjustment gasket (157) is filled between the first baffle (156) and the inner ring of the first angular contact bearing (155); the first end cover (153) is mounted on the first azimuth bracket (152) and the semicircular ring (154); The azimuth reduction gear pair (23) comprises a first azimuth reduction gear (231) and a second azimuth reduction gear (232); The orientation component (25) comprises a second end cover (251), a second angular contact bearing (252), a second baffle (253), a second adjustment gasket (254) and a second orientation bracket (255); the inner ring of the second angular contact bearing (252) is mounted on the left and right rotating shafts of the second orientation bracket (255); the outer ring is installed in the corresponding holes of the left fork arm (26) and the right fork arm (27) by interference fit, so as to limit the outer ring of the second angular contact bearing (252) through shaft shoulder contact; the second baffle (253) is installed on the inner ring of the second angular contact bearing (252) to prevent the inner ring of the second angular contact bearing (252) from axial movement; the second adjustment gasket (254) is filled between the second baffle (253) and the inner ring of the second angular contact bearing (252); and the second end cover (251) is installed on the left fork arm (26) and the right fork arm (27); The first azimuth reduction gear (231) is positioned and mounted on the second azimuth bracket (255), and the centers of the rotation axes of the two coincide with each other; the second azimuth reduction gear (232) is tightly fitted and connected to the output shaft of the azimuth reducer (22).

2. The platform according to claim 1, characterized in that: The pitch motor (11) and the pitch reducer (12) in the pitch transmission unit (1) are mounted on the pitch component (15) by means of clearance fit, one end of the pitch reduction gear pair (13) is fixed on the pitch component (15), and the other end is fastened to the output shaft of the pitch reducer (12), and the rotation axis of the pitch component (15) is coaxially connected to the rotation axis of the pitch angle potentiometer (14).

3. The platform according to claim 1, characterized in that: The azimuth motor (21) and the azimuth reducer (22) in the azimuth transmission unit (2) are mounted on a drive box (28) by means of clearance fit, one end of the azimuth reduction gear pair (23) is fixed to the azimuth component (25), and the other end is fastened to the output shaft of the azimuth reducer (22), and the rotation axis of the azimuth component (25) is coaxially connected to the rotation axis of the azimuth angle potentiometer (24).

4. The platform according to claim 1, characterized in that: The first pitch reduction gear (131) is installed with clearance fit on the rotating shaft of the first pitch bracket (151) and is fixed on the first azimuth bracket (152) via a semicircular ring (154); the second pitch reduction gear (132) is tightly fitted and connected to the output shaft of the pitch reducer (12).

5. The platform according to claim 1, characterized in that: The azimuth motor (21), the azimuth reducer (22), the second azimuth reduction gear (232) and the drive box (28) are assembled into an integral body and mounted on the base (3); the left fork arm (26) and the right fork arm (27) are symmetrically arranged in an "eight" shape and span across the mounting surface of the base (3) to achieve the connection between the pitch transmission unit (1) and the azimuth transmission unit (2).

6. The platform according to claim 1, characterized in that: When a cushion block (6) is added to the contact surface between the left fork arm (26), the right fork arm (27) and the base (3), the requirement for the rotation range of a large-sized radar antenna can be met.

7. The platform according to claim 1, characterized in that The base (3) has an integrated structure with a circular bottom cross-section and an elliptical upper cross-section, and is used as a support for the entire servo drive platform.

8. The platform according to claim 1, characterized in that Clock, intermediate frequency and control signals are transmitted between the transceiver module (4) and the interior of the base (3) via three cables. The three cables are arranged and fixed, enter the central holes of the rotation axes of the azimuth component (25) and the left fork arm (26) from the central holes of the rotation axes of the pitch component (15), and enter the interior of the base (3) after being fixed.

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