Self-floating seabed positioning base station

Abstract

The invention provides a self-floating seabed positioning base station, and relates to the technical field of sonar detection, the self-floating seabed positioning base station comprises a base station base and a base station main body, and the base station main body comprises a base station frame, an acoustic module and a buoyancy module. The base station frame is provided with a release assembly used for being connected with a base station base. The acoustic module is fixed at the top of the base station frame; the buoyancy module is arranged on the base station frame; the buoyancy center of the base station body is higher than the gravity center of the base station body; the buoyancy center of the base station main body is higher than the gravity center of the base station main body, so that the release assembly can be overturned in seawater after being separated from the base station base, the acoustic transducer can be overturned to the bottom of the base station main body and is always in the seawater, and the problem that in the prior art, when the base station needs to be recycled or maintained and floats to the sea surface, the acoustic transducer cannot be overturned is solved. The technical problem that the working personnel is difficult to find the floating base station in time due to the fact that the acoustic transducer is separated from seawater and cannot work is solved, and the working personnel can conveniently position the floating base station and recover the floating base station in time.

Description

Technical Field

[0001] The present invention relates to the field of sonar detection technology, and in particular to a self-floating seabed positioning base station. Background Art

[0002] With the development of society, the progress of the times, and the growing demand for various energy sources, the rational development and utilization of seabed resources has become an irresistible trend. Underwater acoustic positioning systems, commonly referred to as hydroacoustic positioning systems, use underwater sound waves for positioning. Hydroacoustic positioning can accurately, continuously, and automatically locate underwater objects in real time. This technology is crucial for applications such as seabed topography exploration, underwater vehicle control, and underwater remote control operations.

[0003] In underwater acoustic positioning systems, the seafloor positioning base station is a crucial component. It typically houses multiple acoustic transducers, which act as nodes to release acoustic signals, enabling seafloor location. The distance between these transducers defines the base station's baseline distance. However, existing acoustic transducers only emit acoustic signals in seawater; when removed from the seawater and exposed to air, they cease to emit acoustic signals.

[0004] Existing submarine positioning base stations typically mount acoustic transducers on top of a base station, with each base station typically only equipped with one. Multiple base stations (typically no fewer than four) must be deployed in groups to achieve long-baseline positioning. When a base station needs to be recovered or surfaced for repair, the acoustic transducer becomes detached from the water and inoperable, making it difficult for personnel to locate the resurfaced base station in a timely manner. Summary of the Invention

[0005] The present invention aims to provide a self-floating submarine positioning base station equipped with multiple acoustic transducers. This allows only one base station to be deployed, reducing deployment and recovery efforts. This also alleviates the existing technical problem of the acoustic transducers becoming detached from the seawater and inoperable when a base station needs to be recovered or surfaced for repair, making it difficult for personnel to locate the resurfaced base station in a timely manner.

[0006] The present invention provides a self-floating submarine positioning base station, comprising a base station base and a base station body, wherein the base station body comprises:

[0007] a base station frame, wherein a release assembly is provided on the base station frame and the release assembly is selectively connected to the base station base;

[0008] an acoustic module, the acoustic module being fixed to the top of the base station frame, the acoustic module comprising an acoustic transducer;

[0009] a buoyancy module, the buoyancy module being disposed on and fixedly connected to the base station frame, the buoyancy module being configured to drive the base station body to float;

[0010] The center of buoyancy of the base station body is higher than the center of gravity of the base station body.

[0011] Furthermore, the acoustic module also includes a mounting frame and a telescopic rod, the mounting frame is fixed to the base station frame, the acoustic transducer is fixed to one end of the telescopic rod, and the other end of the telescopic rod is slidably arranged on the mounting frame along its extension direction.

[0012] Furthermore, at least four acoustic transducers are provided, the telescopic rods are provided in a one-to-one correspondence with the acoustic transducers, and the plurality of telescopic rods are evenly arranged around the mounting frame.

[0013] Furthermore, a hardware platform is provided on the base station frame, and the hardware platform is fixed to the bottom of the base station frame. Two release components are provided, and the two release components are respectively provided on both sides of the hardware platform.

[0014] Furthermore, the self-floating submarine positioning base station also includes a connecting chain, one end of which is connected to one of the release components, and a connecting hole is provided on the base station base, and the other end of the connecting chain passes through the connecting hole and is connected to another release component.

[0015] Furthermore, the release assembly includes a locking seat and a locking member;

[0016] The locking seat is fixed to the base station frame, one end of the locking member is rotatably connected to the locking seat, and the other end of the locking member is detachably connected to the locking seat. The locking member can be arranged together with the locking seat to form a locking frame, and a connecting ring is provided on one end of the connecting chain, and the connecting ring is sleeved on the locking frame.

[0017] Furthermore, the release assembly further comprises a driving member and a fixing pin;

[0018] The locking member is provided with a locking hole, the driving member is fixed to the locking seat, and the driving member is transmission-connected with the fixing pin to drive the fixing pin to extend into the locking hole or to disengage from the locking hole.

[0019] Furthermore, a driving portion is provided at the bottom of the driving member, the driving portion is arranged in a vertical direction, the fixing pin is arranged through the bottom of the driving portion in a horizontal direction, and the driving portion can rotate around its own axial direction to allow the fixing pin to extend into the locking hole or disengage from the locking hole.

[0020] Furthermore, a buoyancy cavity is provided in the buoyancy module, and the buoyancy cavity is filled with a buoyancy medium, and the density of the buoyancy medium is lower than the density of seawater.

[0021] Furthermore, a plurality of buoyancy modules are provided, and the plurality of buoyancy modules are evenly arranged on the outer wall of the base station frame.

[0022] Beneficial effects:

[0023] The present invention provides a self-floating submarine positioning base station, comprising a base station base and a base station body, wherein the base station body comprises a base station frame, an acoustic module, and a buoyancy module. The base station frame is provided with a release assembly, which is selectively connected to the base station base; the acoustic module is fixed to the top of the base station frame and includes an acoustic transducer; the buoyancy module is provided on the base station frame and fixedly connected to the base station frame, and is configured to drive the base station body to float; the center of buoyancy of the base station body is higher than the center of gravity of the base station body; by setting the center of buoyancy of the base station body higher than the center of gravity of the base station body, when the release assembly is separated from the base station base, the base station body will be separated from the base station base, and the base station body will flip in the seawater and be driven to the sea surface by the buoyancy module. When the base station body floats to the sea surface, the acoustic transducer on the top of the base station frame can flip to the bottom of the base station body, always remaining in the seawater. This solves the technical problem in the prior art that when the base station needs to be recovered or repaired and floats to the sea surface, the acoustic transducer will be separated from the seawater and cannot work, which makes it difficult for staff to find the floating base station in time. To ensure that during the process of retrieving the base station body, the acoustic transducer can use the emitted acoustic signal to facilitate the staff to locate the floating base station and reclaim the floating base station in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the overall structure of the self-floating submarine positioning base station provided by the present invention;

[0026] Figure 2 A schematic structural diagram of the acoustic module in the self-floating submarine positioning base station provided by the present invention;

[0027] Figure 3 A schematic structural diagram of a base station frame in a self-floating submarine positioning base station provided by the present invention;

[0028] Figure 4A schematic structural diagram of the connecting chains and connecting holes in the self-floating submarine positioning base station provided by the present invention;

[0029] Figure 5 A schematic structural diagram of a release assembly in a self-floating submarine positioning base station provided by the present invention;

[0030] Figure 6 A schematic diagram of the center of gravity and buoyancy of the self-floating submarine positioning base station provided by the present invention when the base station frame and the base station base are not separated;

[0031] Figure 7 This is a schematic diagram of the center of gravity and buoyancy of the self-floating submarine positioning base station provided by the present invention after the base station frame and the base station base are separated.

[0032] icon:

[0033] 100. Base station body;

[0034] 110, base station frame; 111, release assembly; 1111, locking seat; 1112, locking member; 1113, locking hole; 1114, fixing pin; 1115, driving unit;

[0035] 112. Hardware platform;

[0036] 120. Acoustic module; 121. Acoustic transducer; 122. Mounting frame; 123. Telescopic rod;

[0037] 130, buoyancy module;

[0038] 200, base station base; 210, connection hole;

[0039] 300. Connect the chain. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0042] like Figures 1 to 3As shown, the present invention provides a self-floating submarine positioning base station, including a base station base 200 and a base station body 100. The base station body 100 includes a base station frame 110, an acoustic module 120, and a buoyancy module 130. The base station frame 110 is provided with a release assembly 111, which is selectively connected to the base station base 200. The acoustic module 120 is fixed to the top of the base station frame 110 and includes an acoustic transducer 121. The buoyancy module 130 is provided on the base station frame 110 and fixedly connected to the base station frame 110. The buoyancy module 130 is configured to drive the base station body 100 to float. The center of buoyancy of the base station body 100 is higher than the center of gravity of the base station body 100.

[0043] That is, the self-floating submarine positioning base station provided by the present invention sets the buoyancy center of the base station body 100 higher than the center of gravity of the base station body 100 so that the release assembly 111 is no longer connected to the base station base 200. After the base station body 100 is separated from the quick-turn base, the base station body 100 flips in the seawater and is driven to float to the sea surface by the buoyancy module 130. When the base station body 100 floats to the sea surface, the acoustic transducer 121 on the top of the base station frame 110 can flip to the bottom of the base station body 100 and remain in the seawater. This solves the technical problem in the prior art that when the base station needs to be recovered or repaired and floats to the sea surface, the acoustic transducer 121 will be separated from the seawater and cannot work, which makes it difficult for staff to find the floating base station in time. It ensures that during the process of retrieving the base station body 100, the acoustic transducer 121 can use the emitted acoustic signal to facilitate staff to locate the floating base station and recover the floating base station in time.

[0044] Specifically, the base station base 200 is constructed with stainless steel rods, and four legs are provided at the bottom for installation on the seabed. The base station base 200 is connected to the base station body 100 through a release assembly 111 to provide support for the base station body 100 and ensure that the base station body 100 does not fall over. A counterweight block can be provided on the base station base 200 to ensure that the base station body 100 can be stably installed on the seabed. The base station body 100 includes a base station frame 110, an acoustic module 120 and a buoyancy module 130. The base station frame 110 is made of overlapping rods made of corrosion-resistant materials such as stainless steel, and its overall shape is cylindrical or prismatic. The acoustic module 120 is arranged on the top of the base station frame 110, and the release assembly 111 is fixed to the bottom of the base station frame 110 by bolts. The buoyancy module 130 is fixed to the base station frame 110 by bolts. Thus, the buoyancy module 130 can provide buoyancy for the base station body 100. When the release assembly 111 is disconnected from the base station base 200, the base station body 100 can be driven to float to the surface. The overall buoyancy of the buoyancy module 130 is greater than the gravity of the base station body 100, but less than the gravity of the base station body 100 and the base station base 200. Therefore, when the release assembly 111 is connected to the base station base 200, the self-floating seabed positioning base station will sink to the seabed and release acoustic signals through the acoustic transducer 121 on the acoustic module 120, completing the positioning operation.

[0045] Furthermore, a buoyancy cavity is provided in the buoyancy module 130 , and the buoyancy cavity is filled with a buoyancy medium, and the density of the buoyancy medium is less than the density of seawater.

[0046] Specifically, the buoyancy module 130 is spherical in shape, with a spherical cavity defined within it. The buoyancy module 130 can be made of a lightweight material such as hard plastic. In this embodiment, the buoyancy medium can be air. In other embodiments of the present application, other gases can also be used as the buoyancy medium. Thus, by injecting air into the buoyancy module 130, the buoyancy module 130 can have a greater buoyancy in seawater, thereby driving the base station body 100 upward.

[0047] Preferably, a plurality of buoyancy modules 130 are provided, and the plurality of buoyancy modules 130 are evenly arranged on the outer wall of the base station frame 110 .

[0048] Specifically, in this embodiment, the base station frame 110 is configured as a regular octagonal prism, with three mounting locations provided on each of its circumferential edges. The buoyancy modules 130 are bolted to these mounting locations. This allows the buoyancy modules 130 to be evenly fixed to the outer walls of the base station frame 110, providing stable buoyancy for the base station body 100. In other embodiments of the present application, the size, quantity, and specifications of the buoyancy modules 130 can also be adjusted based on the desired buoyancy.

[0049] like Figure 2 As shown, the acoustic module 120 provided by the present invention also includes a mounting frame 122 and a telescopic rod 123. The mounting frame 122 is fixed to the base station frame 110, the acoustic transducer 121 is fixed to one end of the telescopic rod 123, and the other end of the telescopic rod 123 is slidably set on the mounting frame 122 along its extension direction.

[0050] Specifically, the mounting frame 122 is mounted on the base station frame 110 by welding or bolting. A hollow tube is provided on the mounting frame 122 for the sliding of the telescopic rod 123. One end of the telescopic rod 123 extends into the hollow tube and slides within it. The acoustic transducer 121 is bolted to the top of the other end of the telescopic rod 123. This allows the position of the acoustic transducer 121 relative to the base station body 100 to be adjusted by sliding the telescopic rod 123 within the hollow tube, flexibly adjusting the acoustic signal emission position of the acoustic transducer 121.

[0051] Preferably, at least four acoustic transducers 121 are provided, and the telescopic rods 123 are provided in a one-to-one correspondence with the acoustic transducers 121 , and the plurality of telescopic rods 123 are evenly arranged around the mounting frame 122 .

[0052] Specifically, in this embodiment, the mounting frame 122 is rectangular as a whole, and the hollow tubes extend horizontally from the four corners of the mounting frame 122. The hollow tubes are at an angle of 90° to each other, and four telescopic rods 123 are provided along with the hollow tubes, and are provided along the extension direction of the hollow tubes. Therefore, when the telescopic rod 123 slides in the hollow tube, the distance between the two relative acoustic transducers 121 is adjusted, and then the baseline length of the acoustic module 120 is adjusted. Generally, a long baseline requires the installation of multiple self-floating submarine positioning base stations on the seabed, while the self-floating submarine positioning base station provided in this embodiment only needs to be deployed once on the seabed to meet the positioning requirements of different baseline lengths. At the same time, different models of acoustic transducers 121 can also be provided on each telescopic rod 123 to adapt to different acoustic performance requirements.

[0053] like Figure 4 and Figure 5 As shown, the base station frame 110 provided by the present invention is further provided with a hardware platform 112 , which is fixed to the bottom of the base station frame 110 , and two release components 111 are provided, which are respectively provided on both sides of the hardware platform 112 .

[0054] Specifically, the hardware platform 112 is bolted to the center of the base station frame 110. The control module for controlling the acoustic transducer 121 and the release assembly 111, as well as the electronics compartment, are all located on the hardware platform 112 and protected by a sealed housing. Two release assemblies 111 are located on either side of the hardware platform 112 and bolted to the base station frame 110. The presence of two release assemblies 111 effectively ensures the secure connection between the base station body 100 and the base station base 200, ensuring the base station body 100's balance on the seabed.

[0055] Preferably, the self-floating submarine positioning base station further includes a connecting chain 300 , one end of which is connected to one of the release components 111 , and a connecting hole 210 is provided on the base station base 200 , and the other end of the connecting chain 300 passes through the connecting hole 210 and is connected to another release component 111 .

[0056] Specifically, the connecting chain 300 is made of stainless steel, with one end of the connecting chain 300 connected to one of the release components 111, and the other end of the connecting chain 300 passing through the connection hole 210 to connect to the other release component 111. Therefore, when either release component 111 is disconnected from the connecting chain 300, the connecting chain 300 can be removed from the connection hole 210 of the base station base 200 and then float up with the base station body 100. This achieves a parallel arrangement of the two release components 111, ensuring that the base station body 100 can be stably released from the base station base 200.

[0057] Furthermore, the release assembly 111 includes a locking seat 1111 and a locking piece 1112; the locking seat 1111 is fixed to the base station frame 110, one end of the locking piece 1112 is rotatably connected to the locking seat 1111, and the other end of the locking piece 1112 is detachably connected to the locking seat 1111, and the locking piece 1112 can be surrounded by the locking seat 1111 to form a locking frame, and a connecting ring is provided on one end of the connecting chain 300, and the connecting ring is sleeved on the locking frame.

[0058] Specifically, a mounting shaft and a mounting shaft frame are provided at the bottom of the locking seat 1111. One end of the locking member 1112 is hinged to the mounting shaft and rotates in the vertical direction. The locking member 1112 is generally U-shaped, and its other end is detachably connected to the locking seat 1111. This forms a locking frame with the locking seat 1111. Connecting rings are provided at both ends of the connecting chain 300, which can be sleeved on the locking member 1112, allowing the connecting chain 300 to be fixed within the locking frame. Therefore, when the release assembly 111 needs to disconnect from the base station base 200, the locking member 1112 is disconnected from the locking seat 1111, the locking member 1112 rotates around the mounting shaft, the locking frame opens, and the connecting ring falls off the locking member 1112, thereby quickly completing the separation of the connecting chain 300 from the release assembly 111.

[0059] Preferably, the release assembly 111 also includes a driving member and a fixing pin 1114; a locking hole 1113 is provided on the locking member 1112, the driving member is fixed to the locking seat 1111, and the driving member is transmission-connected to the fixing pin 1114 to drive the fixing pin 1114 to extend into the locking hole 1113 or disengage from the locking hole 1113.

[0060] Specifically, in this embodiment, the driving member is configured as a driving motor, and a locking seat 1111 is fixed to the top of the driving motor. The locking seat 1111 is provided with a through hole for the output shaft of the driving motor to extend. A fixing pin 1114 is in transmission connection with the output shaft of the driving member. The locking hole 1113 is arranged in a horizontal direction. When the fixing pin 1114 extends into the locking hole 1113, the vertical rotation of the locking member 1112 can be restricted. When the fixing pin 1114 is disengaged from the locking hole 1113, the locking member 1112 can be rotated to disengage from the locking seat 1111, thereby causing the connecting ring to fall off the locking member 1112, thereby completing the separation of the connecting chain 300 from the release assembly 111.

[0061] Preferably, a driving part 1115 is provided at the bottom of the driving member, and the driving part 1115 is arranged in the vertical direction. The fixing pin 1114 is arranged through the bottom of the driving part 1115 in the horizontal direction. The driving part 1115 can rotate around its own axial direction so that the fixing pin 1114 extends into the locking hole 1113 or disengages from the locking hole 1113.

[0062] Specifically, the drive unit 1115 is the output shaft of the drive motor and is arranged vertically. The fixing pin 1114 is arranged horizontally through the bottom of the drive unit 1115. The locking hole 1113 is configured as a waist-shaped hole. As a result, the rotation of the drive unit 1115 allows the fixing pin 1114 to rotate horizontally. When the fixing pin 1114 rotates to be parallel to the locking member 1112, the fixing pin 1114 will disengage the locking hole 1113. When the fixing pin 1114 rotates to be perpendicular to the locking member 1112, the fixing pin 1114 can fully extend into the locking hole 1113, completing the connection between the locking hole 1113 and the fixing pin 1114.

[0063] like Figure 6 and Figure 7As shown, when the base body is connected to the base base, due to the heavy mass of the base base, the buoyancy provided by the buoyancy module 130 is insufficient to lift the entire self-floating submarine positioning base station. At this point, the base body is secured to the base base via the connecting chain 300 and the release assembly 111, and the base body's center of gravity G is higher than its center of buoyancy g. However, when the self-floating submarine positioning base station receives an acoustic command, the release assembly 111 releases the connecting chain 300, separating the base body from the base base. The buoyancy acting on the base body is greater than its gravity, causing it to float upward. Due to the fluctuations of the seawater and the fact that the base body's center of gravity G is higher than its center of buoyancy g, the base body will flip. When the base body reaches the sea surface, its flip is complete, and its center of gravity G is lower than its center of buoyancy g. The acoustic transducer 121 is now at the very bottom of the base body, remaining below the sea surface and emitting a signal to allow personnel to locate the base body.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-floating submarine positioning base station, characterized in that: The invention comprises a base station base (200) and a base station body (100), wherein the base station body (100) comprises: A base station frame (110), wherein a release component (111) is provided on the base station frame (110), and the release component (111) is selectively connected to the base station base (200); an acoustic module (120), the acoustic module (120) being fixed to the top of the base station frame (110), the acoustic module (120) comprising an acoustic transducer (121); a buoyancy module (130), the buoyancy module (130) being arranged on the base station frame (110) and fixedly connected to the base station frame (110), the buoyancy module (130) being configured to be able to drive the base station body (100) to float; The center of buoyancy of the base station body (100) is higher than the center of gravity of the base station body (100).

2. The self-floating submarine positioning base station according to claim 1, characterized in that: The acoustic module (120) further comprises a mounting frame (122) and a telescopic rod (123), wherein the mounting frame (122) is fixed to the base station frame (110), the acoustic transducer (121) is fixed to one end of the telescopic rod (123), and the other end of the telescopic rod (123) is slidably arranged on the mounting frame (122) along its extension direction.

3. The self-floating submarine positioning base station according to claim 2, characterized in that: At least four acoustic transducers (121) are provided, the telescopic rods (123) are provided in one-to-one correspondence with the acoustic transducers (121), and the plurality of telescopic rods (123) are evenly arranged around the mounting frame (122).

4. The self-floating submarine positioning base station according to any one of claims 1 to 3, characterized in that: The base station frame (110) is further provided with a hardware platform (112), the hardware platform (112) being fixed to the bottom of the base station frame (110), and two release components (111) being provided, and the two release components (111) being respectively provided on both sides of the hardware platform (112).

5. The self-floating submarine positioning base station according to claim 4, characterized in that: The self-floating submarine positioning base station further comprises a connecting chain (300), one end of the connecting chain (300) is connected to one of the release components (111), a connecting hole (210) is provided on the base station base (200), and the other end of the connecting chain (300) passes through the connecting hole (210) and is connected to the other release component (111).

6. The self-floating submarine positioning base station according to claim 5, characterized in that: The release assembly (111) comprises a locking seat (1111) and a locking member (1112); The locking seat (1111) is fixed to the base station frame (110), one end of the locking member (1112) is rotatably connected to the locking seat (1111), and the other end of the locking member (1112) is detachably connected to the locking seat (1111), and the locking member (1112) can be surrounded by the locking seat (1111) to form a locking frame, and a connecting ring is provided on one end of the connecting chain (300), and the connecting ring is sleeved on the locking frame.

7. The self-floating submarine positioning base station according to claim 6, characterized in that: The release assembly (111) further includes a driving member and a fixing pin (1114); A locking hole (1113) is provided on the locking member (1112), the driving member is fixed to the locking seat (1111), and the driving member is transmission-connected with the fixing pin (1114) to drive the fixing pin (1114) to extend into the locking hole (1113) or to disengage from the locking hole (1113).

8. The self-floating submarine positioning base station according to claim 7, characterized in that: A driving portion (1115) is provided at the bottom of the driving member. The driving portion (1115) is arranged in a vertical direction. The fixing pin (1114) is arranged to pass through the bottom of the driving portion (1115) in a horizontal direction. The driving portion (1115) can rotate around its own axial direction so that the fixing pin (1114) extends into the locking hole (1113) or disengages from the locking hole (1113).

9. The self-floating submarine positioning base station according to any one of claims 1 to 3, characterized in that: A buoyancy cavity is provided in the buoyancy module (130), and the buoyancy cavity is filled with a buoyancy medium, wherein the density of the buoyancy medium is less than the density of seawater.

10. The self-floating submarine positioning base station according to claim 9, characterized in that: A plurality of the buoyancy modules (130) are provided, and the plurality of the buoyancy modules (130) are evenly arranged on the outer wall of the base station frame (110).

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