A floating river width measuring instrument, a river width measuring method, and a measuring data transmission method

Abstract

The present application relates to a kind of floating river width measuring instrument, river width measuring method and measurement data transmission method.The floating river width measuring instrument includes ranging radar, controller, memory, wireless transmitter, battery and shell, can also include water pressure sensor, counterweight, water quality sensor etc.The river width measuring instrument can float in water, and real-time record the position information of measuring instrument and river width information such as hydrological data.By configuring multiple river width measuring instruments, river width measuring instrument information matrix can be formed, to prevent the loss of information when individual river width measuring instrument is lost.The present application can measure river width and other hydrological data in unmanned area at low cost.

Description

A floating river width measuring instrument, a river width measurement method, and a measurement data transmission method. Technical Field

[0001] This invention belongs to the field of measurement, and in particular to a floating river width measuring instrument, a river width measuring method, and a measurement data transmission method. Background Technology

[0002] River width measurement is a routine measurement requirement, and using lasers for river width measurement is also a common method. LiDAR is a commonly used river measurement instrument that measures river width by reflecting a laser beam. Below are some common methods for measuring river width using lidar:

[0003] Single-point laser ranging method: The lidar is installed on one side of the river. A single laser beam is used to measure the point in the river closest to the lidar. Then the distance from the lidar to the other side of the river is measured. The difference between the two is the width of the river.

[0004] Multi-line laser scanning method: The lidar is fixed on the measuring vehicle or boat, and multiple laser beams are used to scan the river to obtain distance data at various locations in the river, and then the width of the river is calculated based on the data.

[0005] LiDAR imaging method: The LiDAR is fixed on a helicopter or drone, and the entire river is scanned by the LiDAR. The scanned data is converted into a three-dimensional model of the river, and finally the width of the river is measured from the three-dimensional model.

[0006] Regardless of the method used, when measuring river width using lidar, it is necessary to pay attention to the influence of factors such as the lidar's installation location, scanning range, and accuracy.

[0007] However, all of the above measurement methods require manual intervention. The technical problem that needs to be solved by those skilled in the art is to conduct automatic river width measurement in uninhabited areas at low cost. Summary of the Invention

[0008] The purpose of this invention is to provide a method for conducting hydrological measurements in uninhabited areas and transmitting hydrological information such as river width and water flow velocity to relevant personnel for research.

[0009] A floating river width measuring instrument includes: a ranging radar, a controller, a memory, a wireless transmitter, a battery, a water pressure sensor, and a housing; wherein there are at least six ranging radars, which are evenly arranged around the housing; there are at least six water pressure sensors, each corresponding to one of the radars; the radars, controller, memory, wireless transmitter, and battery are connected to the housing; the radars, controller, memory, wireless transmitter, and water pressure sensors are powered by the battery.

[0010] Preferably, the housing includes a top cover, a radar mounting section, and a base.

[0011] Preferably, a controller is provided inside the top cover.

[0012] Preferably, the river width measuring instrument further includes a radar bracket, and the radar mounting part includes a radar mounting cylinder; the radar bracket is disposed inside the radar mounting cylinder.

[0013] Preferably, the radar bracket includes an outer bracket and an inner bracket. The outer bracket includes a first leg extending towards the mounting cylinder. The first leg comprises several groups, each group corresponding to one radar. A first gap is formed between two adjacent legs, which is used to clamp the radar. The end of the leg contacts the mounting cylinder. The inner bracket includes an outer wall and an inner wall. A first opening is provided on the outer wall, and a second opening is provided on the inner wall. The width of the first opening is greater than the width of the second opening. The width of the gap between two adjacent legs is equal to the width of the first opening. A second gap also exists between the outer bracket and the inner bracket. A connecting column is provided between the second gap, and a connecting plate is provided between the connecting columns. The lower surface of the connecting plate contacts the radar.

[0014] Preferably, the base includes a base bucket, a battery holder, and a battery; the bottom of the base includes a through hole, and the water pressure sensor is disposed in the through hole.

[0015] A river width measuring instrument includes: a ranging radar, a controller, a memory, a wireless transmitter, a battery, and a housing; wherein the ranging radar comprises at least six radars, which are evenly arranged around the housing; the radar, controller, memory, wireless transmitter, and battery are connected to the housing; the radar, controller, memory, and wireless transmitter are powered by the battery; the housing includes a top cover, a radar mounting section, and a base; the controller is disposed inside the top cover; the river width measuring instrument further includes a radar bracket, the radar mounting section includes a radar mounting cylinder, and the radar bracket is disposed inside the radar mounting cylinder.

[0016] A method for measuring river width using a floating river width measuring instrument, the river width measuring instrument comprising at least 6 radars, wherein the ranging radars are uniformly arranged around the housing;

[0017] The river width measuring instrument also includes at least 6 water pressure sensors, each corresponding to one of the radar sensors;

[0018] The water pressure sensor can detect water pressure, and the river width measurement steps include:

[0019] The differential pressure calculation steps are as follows: calculate the water pressure of each water pressure sensor, select the maximum and minimum water pressure, and determine the direction of water flow from the water pressure sensor that detects the maximum water pressure to the water pressure sensor that detects the minimum water pressure.

[0020] The radar selection process involves dividing the radars into two groups along the direction of water flow, with at least two radars selected in each group. The two radars are either arranged adjacent to each other or separated by one radar.

[0021] The steps for calculating the river width are as follows: First, obtain a set of radar measurement distances to the riverbank, namely the first distance and the second distance. Based on the known first angle between the two radars, calculate the first vertical distance from the measuring instrument to the riverbank. Second, obtain another set of radar measurement distances to the riverbank, namely the third distance and the fourth distance. Based on the known second angle between the two radars, calculate the second vertical distance from the measuring instrument to the riverbank. The river width is equal to the first distance plus the second distance.

[0022] A method for measuring river width using a floating river width measuring instrument, the instrument comprising at least six radars, wherein the ranging radars are uniformly arranged around a housing; the river width measurement steps include:

[0023] The radar data measurement steps involve selecting three adjacent radars: the first radar, the second radar, and the third radar, with the second radar located between the first and third radars. The first distance from the first radar to the shore is obtained, as are the second, third, and fourth distances from the second radar to the shore.

[0024] The radar selection process involves the following steps: if the second distance is less than the first or third distance, then the first or third radar is selected as the first calculation radar; a fourth radar with a phase difference of 180 degrees from the first radar and a fifth radar with a phase difference of 180 degrees from the third radar are selected as the second calculation radars.

[0025] If the second distance is greater than the first distance or the third distance, then the second radar is used as the first radar, the third radar is used as the second radar, and the radar on the other side of the third radar is used as the third radar, and the radar data measurement steps are repeated.

[0026] The steps for calculating the river width are as follows: Based on the first calculation radar (i.e., the first distance and the third distance) and the angle between the first and third radars, calculate the first vertical distance from the measuring instrument to the riverbank; based on the second calculation radar (i.e., the fourth distance and the fifth distance) and the angle between the fourth and fifth radars, calculate the second vertical distance from the measuring instrument to the riverbank. The river width distance is equal to the first distance plus the second distance.

[0027] A measurement data transmission method using a floating river width measuring instrument, employing multiple river width measuring instruments, wherein the base of the river width measuring instrument further includes a through hole, and the measuring instrument further includes accessories, wherein the accessories are one of a water flow sensor, a water quality sensor, a counterweight, or a sealing component;

[0028] A water flow sensor, a water quality sensor, a counterweight, or a seal mates with the through hole;

[0029] The application uses multiple river width measuring instruments as described, each with different accessories;

[0030] The measuring instrument can send its own measuring instrument code, as well as positioning information and information transmission time, to nearby measuring instruments. Attached Figure Description

[0031] Figure 1. 3D view of the floating river width measuring instrument

[0032] Figure 2. Longitudinal section view of the floating river width measuring instrument

[0033] Figure 3. Front view of the longitudinal section of the floating river width measuring instrument

[0034] Figure 4. One of the cross-sectional views of the floating river width measuring instrument.

[0035] Figure 5. Cross-sectional view of the floating river width measuring instrument (Part 2)

[0036] Figure 6. Cross-sectional view of the floating river width measuring instrument (second front view)

[0037] Figure 7. Cross-sectional view of the floating river width measuring instrument (Part 3)

[0038] Figure 8. Cross-sectional view of the floating river width measuring instrument (Part 4)

[0039] Figure 9. Water pressure sensing unit of the floating river width measuring instrument

[0040] Figure 10 Schematic diagram of the floating river width measuring instrument

[0041] Figure 11 Controller of the floating river width measuring instrument Detailed Implementation

[0042] Examples of embodiments described in this invention are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] It should be stated in advance that the directional terms such as "inner side", "outer side", "upper", and "lower" in this embodiment are based on the current direction shown in the accompanying drawings and are not intended to limit the orientation of the present invention. If the product orientation in the accompanying drawings changes, the directional terms may be adjusted accordingly.

[0045] The river width measuring instrument 100 includes a ranging radar, a controller, a memory, a wireless transmitter, a battery, a water pressure sensor, and a housing. The housing includes a top cover 1, a radar mounting part 2, and a base 3. The top cover 1, radar mounting part 2, and base 3 together form a cavity 6. This river width measuring instrument has a waterproof structure, and due to the presence of the cavity 6, it can float on water. Furthermore, when the river width measuring instrument is floating on water, the radar 5 is positioned above the water surface.

[0046] The top cover 1 includes a first flange. The radar mounting section 2 includes a radar mounting cylinder 201, a second flange located at one end of the mounting cylinder 201, and a third flange located at the other end of the mounting cylinder 201. The first flange and the second flange cooperate, and both the first flange and the second flange are provided with through holes. The first flange and the second flange are fixed by fasteners installed inside. The first flange is provided with a gasket receiving portion; the second flange is also provided with a gasket receiving portion. The top cover 1 also includes a gasket, which is disposed in the gasket receiving portions of the first flange and the second flange. The gasket can seal the river width measuring instrument to prevent moisture from entering and affecting the operation of internal components.

[0047] The top cover 1 also houses a controller 102 and a controller bracket 1021. The controller bracket 1021 has longitudinal ribs 10211 and transverse ribs 10212. Grooves are provided on the longitudinal and transverse ribs to accommodate the controller. A connecting plate 103 is also provided. The connecting plate 103 fixes the controller 102.

[0048] Beneficially, the longitudinal and transverse ribs reduce the impact of vibrations on the controller when the river width measuring instrument moves in turbulent river water, thus improving the safety factor of the equipment. Furthermore, the longitudinal and transverse ribs enhance the strength of the river width measuring instrument.

[0049] Reinforcing ribs are also provided around the outer perimeter of the top cover 1.

[0050] The controller 102 includes a river width measurement unit 111, which collects and processes signals from the radar 5. The controller 102 also includes a positioning unit 112, which uses a satellite positioning system to locate the river width measuring instrument. The controller 102 further includes an angle measuring device 114, which senses signals such as the rotation angle and rotation speed of the river width measuring instrument. The controller 102 also includes a signal unit 113, which receives and transmits signals. These signals include those detected by the river width measuring instrument, such as radar signals, river width signals, the river width measuring instrument's position signals, and the river width measuring instrument's rotation angle signals. The signal unit 113 includes a signal receiving unit and a signal transmitting unit. The signal unit can use conventional wireless transmission schemes such as Wi-Fi, Bluetooth, 2G, 3G, 5G, and 4G. The controller 102 also includes a processor 115, which processes the signals detected by the various sensors. The processor 115 is connected to the signal unit 113 and is used to receive and transmit signals.

[0051] Alternatively, multiple river width measuring instruments can be used, each equipped with a signaling device. The signal measured by one river width measuring instrument can be transmitted to adjacent instruments. Information can be backed up between the various river width measuring instruments. The backed-up information may include the instrument's serial number, as well as the measurement and calculation information from each instrument.

[0052] Some river width measuring instruments, when flowing along the river unattended, are easily obstructed by obstacles such as rocks and trees, preventing them from effectively following the predetermined path. However, if a river width measuring instrument sends its position signal to a neighboring instrument, the neighboring instrument records the position signal and the instrument's number. If a river width measuring instrument has no neighboring instruments, it cannot transmit its signal to other instruments. Workers collect river width measuring instruments at designated collection points. By analyzing the number of instruments, their codes, and signal information, they can determine the last signal position of any instruments that have not reached their designated locations. Determining the signal position facilitates the search for lost measuring instruments.

[0053] Advantageously, the controller can connect to radar and process signals from the radar and its own sensors to calculate river width, the location of the river width measuring instrument, and water flow velocity, and then transmit these signals to other river width measuring instruments or measuring signal receiving devices. This enables the collection of river width and other hydrological data in uninhabited areas.

[0054] The radar mounting section 2 includes a radar mounting cylinder 201. A ranging radar is installed inside the mounting cylinder 201. The mounting cylinder 201 includes a side wall with a through hole, and a radar protective cover is installed inside the through hole.

[0055] A radar 5 and a radar bracket 4 are disposed on the inner side of the mounting cylinder 201. The radar bracket 4 includes an outer bracket 401 and an inner bracket 402, as well as a connecting frame 405 connecting the outer bracket 401 and the inner bracket 402. The radar 5 is mounted between the outer bracket 401 and the inner bracket 402. The outer bracket 401 is provided with a first leg 408 extending towards the mounting cylinder. The first leg 408 is divided into several groups, and each group of first legs 408 has two branch legs 4081. A first gap 4083 is formed between the two branch legs 4081, and the first gap forms a portion 501 for accommodating the radar 5. The outer bracket 401 also includes an outer bracket connecting wall 4082, which is used to connect the two first legs of two adjacent first leg groups. The end of the first leg 408 contacts the mounting cylinder 201. The inner support 402 has an outer wall 4021 and an inner wall 4022. A first opening 40211 is provided on the outer wall 4021, forming another part 502 for accommodating the radar 5. The inner support 402 also has an inner wall 4022, on which a second opening 40212 is provided. The opening of the first opening 40211 communicates with the second opening 40212, and the width of the first opening is greater than the width of the second opening. The inner support 402 also includes a through hole 4023 located between the outer wall and the inner wall of the inner support 402. A second gap 409 exists between the inner support 402 and the outer support 401. A connecting post 4091 is provided within the second gap 409. The first gap 4083 and the first opening 40211 form a radar receiving groove 406 for accommodating the radar. The system also includes a connecting portion, which comprises a connecting post 4031 with a connecting hole at one end. The connecting portion also includes a connecting plate 403. The connecting plate 403 has a through hole, within which a connector is disposed to connect the two connecting posts. The lower surface of the connecting plate 403 contacts the radar 5. The connecting plate 403 defines the upward movement space of the radar 5.

[0056] Beneficially, by setting up an inner and outer support with a gap, and by providing legs, openings, and through holes on the inner support, the radar can be buffered when the river width measuring instrument encounters strong water flow impacts. The impact force is mitigated along the gaps and legs, preventing damage to the radar. In particular, only the legs of the radar support 4 contact the mounting cylinder 201, allowing the impact received by the mounting cylinder to be transmitted along the legs to the connecting wall 4082 of the outer support, preventing impact on the radar. The through holes on the inner support 402 also weaken the impact force, thereby reducing the impact on the radar. The first gap, the first opening, and the second opening also effectively dissipate the impact on the radar 5.

[0057] Furthermore, the radar bracket 4 can be integrally injection molded, and the radar can be installed along the first gap and the first opening, facilitating radar installation. The design of the second opening also allows for easy routing of the radar data cable (not shown).

[0058] The mounting cylinder 201 is also provided with at least one radar opening 2011, on which a radar 5 is correspondingly mounted. A sealing gasket is provided on the opening. A radar cover 2012 is also provided on the radar opening 2011.

[0059] The controller 102 is connected to each radar 5.

[0060] Optionally, there are at least six radars 5.

[0061] Preferably, there are eight radars 5. The eight radars are evenly distributed on the mounting cylinder 201. The mounting cylinder 201 has an axis. With the axis as the center, the angle between any two adjacent radars is 45 degrees.

[0062] The base 3 has a fourth flange 306, a base barrel 301, a battery holder 302, and a battery (not shown). The fourth flange mates with the third flange. A sealing gasket is also provided between the fourth flange and the third flange. The battery holder 302 has a battery fixing hole 305. The battery holder 302 can move up and down along the inner wall of the base barrel 301. A through hole 303 is also provided on the bottom of the base 3. A seal, a water flow sensor, and a counterweight can be installed in the through hole 303.

[0063] A water flow sensor (not shown in the figure) can also be installed inside the through hole 303 to sense the water flow speed and direction.

[0064] Optionally, the water flow sensor can be equipped with eight water pressure sensors for sensing the water pressure in the corresponding radar direction. As shown in the attached figure, the water pressure sensor 71 is disposed on the water pressure sensing unit 7, which includes a water pressure sensor mounting post 72 and the water pressure sensor 71.

[0065] Advantageously, when the river width detector is located in the river, the water pressure sensing unit 7 can sense the water flow pressure. Based on the measured values, the direction of the line connecting the water pressure sensor corresponding to the maximum measured water pressure to the water pressure sensor corresponding to the minimum measured water pressure is the approximate direction of the water flow.

[0066] Optionally, the water flow sensor can be a water flow velocity sensor.

[0067] A seal can be installed inside the through hole 303 for sealing.

[0068] A counterweight can be installed inside the through hole 303. When the river width measuring instrument requires greater weight, such as to reduce the swaying of the instrument due to water flow impact, a threaded counterweight can be installed inside the through hole 303. This counterweight can be a bolt or other counterweight. For example, the counterweight can be extended outward along the bottom of the river width measuring instrument, thereby lowering the center of gravity of the instrument. A lower center of gravity reduces the impact resistance of the instrument, resulting in less swaying.

[0069] A water quality sensor, such as measuring the acidity or alkalinity of water, can also be installed inside the through-hole 303.

[0070] Advantages include the ability to set different sensors, such as flow sensors and water quality sensors, as needed by setting through-hole 303; the ability to configure different river width measuring instruments when setting multiple river width measuring instruments, allowing multiple values ​​to be measured in a single measurement, and the ability to back up the measurement data of each instrument; the ability to set counterweights to adapt to different measurement requirements; or the ability to set seals when no sensors or counterweights are required.

[0071] The river width measuring instrument of this invention is used to measure the width of rivers and transmit information.

[0072] A method for measuring river width using a floating river width measuring instrument, the instrument comprising at least six radars, with the ranging radars evenly arranged around a housing; the instrument also includes at least six water pressure sensors, each corresponding to one of the radars; the water pressure sensors are capable of sensing water pressure; the river width measurement steps include: a pressure difference calculation step, calculating the water pressure of each water pressure sensor, selecting the maximum and minimum water pressures, and determining the direction of water flow from the water pressure sensor detecting the maximum water pressure to the water pressure sensor detecting the minimum water pressure; a radar selection step, dividing the radars into two groups along the water flow direction, with at least two radars selected in each group, the two radars being arranged adjacently or with one radar spaced apart; when the number of radars is eight, the radars are evenly distributed. The angle between adjacent radars is 45 degrees.

[0073] The steps for calculating the river width are as follows: First, obtain a set of radar measurement distances to the riverbank, namely the first distance OC and the second distance OA. Based on the known first included angle of 90 degrees between the two radars, calculate the first vertical distance OR from the measuring instrument to the riverbank. Second, obtain another set of radar measurement distances to the riverbank, namely the third distance OF and the fourth distance OB. Based on the known second included angle of 90 degrees between the two radars, calculate the second vertical distance OL from the measuring instrument to the riverbank. The river width is equal to the first distance plus the second distance.

[0074] The specific calculation principle is as follows:

[0075] ∠AOC = ∠FOB = 90°

[0076] ∠AOE=∠EOC=∠A0F=∠BOD=45°

[0077] S∆AOC=(OA*OC) / 2=(AC*OR) / 2

[0078] In the above formula, OA and OC are measured, and the angle ∠AOC is known to be 90 degrees. Given the lengths of two adjacent sides and the included angle of a triangle, the length of the third side, AC, can be calculated using trigonometric functions. Therefore, the vertical distance from the river width measuring instrument to the bank can be calculated using the above formula, with AC as the base and OR as the height.

[0079] Similarly, OL can be calculated as the vertical distance from the river width measuring instrument to the bank.

[0080] Therefore, OR plus OL gives the river width value.

[0081] According to the present invention, the applicant may also calculate the river width according to another calculation method, which is different from the above calculation method. Its feature is that, instead of using a water pressure sensor, it calculates which two radars are facing the riverbank by comparing radar measurement values.

[0082] The scheme is as follows: Radar data measurement steps: Select three adjacent radars, namely the first radar, the second radar and the third radar, with the second radar between the first and the third radars; Obtain the first distance from the first radar to the shore, obtain the second distance from the second radar to the shore, and obtain the third distance from the third radar to the shore; Radar selection steps: If the second distance is less than the first distance or the third distance, then select the first radar and the third radar as the first calculation radar.

[0083] Advantageously, the two radars facing the riverbank can be identified by comparing the side lengths of a triangle. For example, if the first distance is OA, the second distance is OE, and the third distance is OC, then when OE lies between OA and OC, it can be determined that the radars on either side of OE are facing the same riverbank. Therefore, the OR, the vertical distance from the river width measuring instrument to the bank, can be calculated using the aforementioned trigonometric function method.

[0084] When OF is greater than OA and OD, the radars corresponding to OA and OD are pointing at two different riverbanks. The value calculated using trigonometric functions is not equal to the vertical distance from the river width measuring instrument to the bank.

[0085] Selecting the first and third radars obtained above, specifically the fourth radar (180 degrees out of phase with the first radar) and the fifth radar (180 degrees out of phase with the third radar), as the second calculation radars, the distance of OL can be calculated. Following the above calculation method, the river width can then be obtained.

[0086] If the second distance is greater than the first or third distance, that is, when OF is greater than OA and OD, then the radars corresponding to OA and OD are pointing at two different riverbanks. In this case, the second radar is used as the first radar, the third radar is used as the second radar, and the radar on the other side of the third radar is used as the third radar, and the radar data measurement steps are repeated.

[0087] A method for data transmission using a floating river width measuring instrument is disclosed. Multiple river width measuring instruments are used, each with a base including a through hole. Each measuring instrument also includes accessories, such as a flow sensor, a water quality sensor, a counterweight, or a seal. The flow sensor, water quality sensor, counterweight, or seal mates with the through hole. The multiple river width measuring instruments are configured with different accessories. Each measuring instrument can transmit its own instrument code, location information, and transmission time to nearby measuring instruments. The flow sensor can be a water pressure sensor or a flow velocity sensor, or other flow parameter sensors.

[0088] When multiple river width measuring instruments are configured, they form a river width measuring instrument matrix via the controller's wireless transmitter, creating a parameter matrix for measurement. They exchange and back up their respective measurement data, including instrument information, real-time location information, river width information, radar measurement values, water pressure sensor information, flow velocity sensor information, instrument sealing information, and counterweight information. This allows other instruments to inherit the information of a lost instrument. The instrument's own information includes its ID and the type of measurement information (e.g., some instruments measure river width, while others measure river velocity). By using the river width parameters measured by each instrument at the same location, the river width information can be calibrated, resulting in more accurate measurement results.

[0089] When a river width measuring instrument is destroyed by rapids or rocks, its previous information is backed up to another measuring instrument. This new instrument records the location and measurement parameters of the original instrument before it was destroyed. This allows the location of the original measuring instrument to be determined, facilitating its relocation.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, or alterations made by those skilled in the art using the disclosed technical content shall fall within the protection scope of the present invention.

Claims

1. A floating river width measuring instrument, characterized in that: The river width measuring instrument includes: a ranging radar, a controller, a memory, a wireless transmitter, a battery, a water pressure sensor, and a housing; wherein there are at least six ranging radars, which are evenly arranged around the housing; there are at least six water pressure sensors, each corresponding to one of the radars; the radars, controller, memory, wireless transmitter, and battery are connected to the housing; the radars, controller, memory, wireless transmitter, and water pressure sensors are powered by the battery; the housing includes a top cover, a radar mounting section, and a base; the controller is housed inside the top cover; the river width measuring instrument also includes a radar bracket, the radar mounting section including a radar mounting cylinder; the radar bracket is located inside the radar mounting cylinder, and the radar bracket includes an outer bracket and an inner bracket. The bracket includes an outer bracket comprising a first leg extending toward a mounting cylinder. The first leg comprises several groups, each group corresponding to a radar. A first gap is formed between two adjacent legs, which is used to clamp the radar. The end of the leg contacts the mounting cylinder. The inner bracket comprises an outer wall and an inner wall. A first opening is provided on the outer wall, and a second opening is provided on the inner wall. The width of the first opening is greater than the width of the second opening. The width of the first gap is equal to the width of the first opening. A second gap is also provided between the outer and inner brackets. A connecting column is provided between the second gap, and a connecting plate is provided between the connecting columns. The lower surface of the connecting plate contacts the radar.

2. The river width measuring instrument according to claim 1, characterized in that: The base includes a base bucket and a battery holder; the bottom of the base includes a through hole, and the water pressure sensor is disposed in the through hole.

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