WO2016112708A1 - 一种船舶辅助泊岸方法和系统 - Google Patents
一种船舶辅助泊岸方法和系统 Download PDFInfo
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- WO2016112708A1 WO2016112708A1 PCT/CN2015/090136 CN2015090136W WO2016112708A1 WO 2016112708 A1 WO2016112708 A1 WO 2016112708A1 CN 2015090136 W CN2015090136 W CN 2015090136W WO 2016112708 A1 WO2016112708 A1 WO 2016112708A1
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G3/00—Traffic control systems for marine craft
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/50—Depth or shape recovery
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G3/00—Traffic control systems for marine craft
- G08G3/02—Anti-collision systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2213/00—Navigational aids and use thereof, not otherwise provided for in this class
- B63B2213/02—Navigational aids and use thereof, not otherwise provided for in this class using satellite radio beacon positioning systems, e.g. the Global Positioning System GPS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/02—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring
- B63H25/04—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring automatic, e.g. reacting to compass
- B63H2025/045—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring automatic, e.g. reacting to compass making use of satellite radio beacon positioning systems, e.g. the Global Positioning System [GPS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/53—Determining attitude
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20024—Filtering details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30248—Vehicle exterior or interior
- G06T2207/30252—Vehicle exterior; Vicinity of vehicle
Definitions
- the invention relates to a method and a device for safe navigation of a ship. More specifically, the present invention relates to a method and apparatus for accurately monitoring ship and shoreline distance and ship attitude during ship berthing.
- the foggy days will seriously affect the visual observation effect of the pilot, causing the pilot to be unable to discriminate the attitude of the ship relative to the berth of the dock and fail to direct the ship to safely berth.
- the hydrological conditions of different ports and waterways are different, but ships with a visibility of less than 1 nautical mile are required to slow down the navigation. Large-scale ships generally stop sailing when the visibility is less than 1000 m. In the foggy world, due to low visibility, serious accidents such as large ships crashing into bridge piers often occur. At the same time, the ship is also affected by fog when it passes the dam, resulting in the ship must stop passing the dam in foggy weather. Therefore, foggy weather not only affects the safety of ship navigation, but also seriously affects the smoothness of waterway and port logistics.
- ships will refer to some radio pilot systems, such as radar, when they are berthing.
- the radar system is vulnerable to external factors such as climate, terrain and external disturbances, and considering that the radar is usually installed at a higher position of the ship, it can detect the distance from the ship and it is not easy to detect the distance from the ship.
- the radar system has great limitations in the process of berthing the ship.
- the ship berthing scheme is usually determined by the pilot's visual grasp and judgment. In order to avoid the occurrence of potential safety accidents, people have to stipulate that in bad weather, the ship should be suspended and stopped.
- navigation aids under severe weather conditions, such as radar navigation systems and automatic identification systems (AIS) in the maritime field, have been developed. These navigation aids can assist the driver to drive in bad weather conditions to a certain extent, but there are still many shortcomings due to various aspects such as technology, cost, precision and site.
- AIS automatic identification systems
- the above-mentioned prior art radar navigation system and automatic identification system (AIS) are both radio communication type navigation aid systems.
- marine radar navigation system as a common means of navigation aids, plays a role in positioning navigation and collision avoidance, but it also has its own inevitable defects.
- radar navigation systems are prone to clutter caused by waves and rain and snow, and radars with the same frequency or frequency close to each other also produce co-channel radar interference clutter at close range.
- the radar usually has a fixed blind zone of 30-50 meters, which will cause fan-shaped shadow zones due to the influence of large ships on the ship.
- False echoes such as false echoes, indirect reflected false echoes, and sidelobe echoes. All of the above-mentioned interference clutters and false echoes often make it difficult for the operator to distinguish or influence the observations in actual use, which leads to a wrong orientation for navigation safety.
- the Automatic Ship Identification System is a satellite-based positioning device with an accuracy of 5-30 meters. Because there is no blind zone, its positioning accuracy is higher than that of radar, and it does not change due to target distance and azimuth change. It is composed of shore-based (base station) facilities and shipborne equipment. It is a new type of network technology and modern communication. Digital navigation aid system and equipment integrating technology, computer technology and electronic information display technology. AIS is essentially a broadcast repeater system that works on the maritime mobile communication channel VHF. It can automatically transmit ship information such as ship name, call sign, maritime mobile identification number, position, heading, speed, etc. to other ships or shores.
- VHF maritime mobile communication channel
- AIS also has many limitations.
- the information it provides is not a real visual image. This does not substantially help the foggy berthing navigation. Since the pilots do not see the surrounding environment, the vessel is still forced to stop; The accuracy of the equipment is 5-30 meters, which may meet the collision avoidance requirements. However, for close berthing, the accuracy error of 5m is easy to cause serious docks or barges at the critical moment of the last berthing of large ships. Collision accident.
- the triaxial electronic compass is connected to the optical imaging module to obtain various angle information of the optical imaging module during rotation;
- the optical imaging module comprises a beam splitter, a visible or infrared light imaging channel, and a sun blind ultraviolet imaging channel, the visible light or the infrared light
- the imaging channel receives visible light signals and outputs visible or infrared optical video signals.
- the sun blind ultraviolet imaging channel receives the day blind ultraviolet light signal and outputs a day blind ultraviolet light video signal;
- the information processing terminal is configured to calculate the ship's navigation posture data and output the synthesized video to display according to the digital signals of the two channels of video. system.
- the three-axis electronic compass is connected to the optical imaging module to obtain various angle information of the optical imaging module during rotation, and finally the angle information of the ship relative to the shoreline is obtained.
- the system also has shortcomings. For example, when using a three-axis electronic compass, sometimes it is subject to huge magnetic field interference, which causes errors in the data obtained, and it is difficult to obtain a more accurate distance of the hull from the berthing shoreline, making berthing still difficult.
- an object of the present invention is to provide a berthing method for a ship, which uses a day blind ultraviolet light detecting technology and a GPS positioning technology to obtain a posture and relative distance data of a ship relative to a shoreline and a berth, and is used for Ships are safely berthed.
- Another object of the present invention is to provide a system for guiding a ship's berth.
- a ship assisted berthing method comprises: providing a sun blind ultraviolet imaging module and a data processing module on the ship, and the sun blind ultraviolet imaging module according to the received solar blind light source array arranged in advance on the shore
- the ultraviolet light signal is used to measure the positional relationship information between the ship and the relevant berth, and the method further includes:
- the data processing module includes a signal receiving component that can be matched to the sunblind ultraviolet imaging module and the GPS signal receiving module in a wired and/or wireless manner, and from the sunblind ultraviolet imaging module and the GPS signal Receiving data related to the position of the ship in the receiving module, calculating a coordinate value of the reference point of the ship, and determining the location according to the position data of the solar blind ultraviolet imaging module and the GPS signal receiving module installed on the ship The attitude angle of the ship relative to the berth shoreline.
- the attitude of the ship relative to the berth shoreline can be represented by the position coordinates of several reference points on the ship. It can also be represented by the coordinates of a reference point, plus at least one attitude angle of the vessel.
- the attitude angle is at least one of a plurality of angles representing a ship's attitude, such as a heading angle, a pitch angle, and a roll angle.
- the GPS method and system referred to in the present invention which includes a GNSS system (Global Navigation Satellite System) and the like, refers to a technique for ground target positioning using a geosynchronous satellite rotating around the ground. Such technologies include, for example, GPS in the United States, the Beidou system in China, the Galileo system in Europe, the GLONASS system in Russia, and the like.
- the GPS signal receiving module may be configured to set at least one GPS signal receiving module on the shore, and install at least one GPS signal receiving module on the ship; the GPS signal receiving module on each ship and The GPS signal receiving module on the shore cooperates to form a GPS differential system, wherein the GPS signal receiving module on the shore acts as a GPS master station, and the GPS signal receiving module on the ship acts as a GPS slave station, and the GPS master station is used to enhance the GPS slave station.
- the measurement accuracy of the ship position and attitude angle data; and the GPS main station after receiving the position data from the relevant satellite, may directly send it to the data processing module to obtain the position data of the ship, and may also Other data that is beneficial to improve the accuracy of the GPS slave station location data is first transmitted to at least one GPS slave station. After the GPS slave station integrates the received GPS location to receive data, the data is processed, and then the data is sent to the data. Processing the module to obtain location data of the vessel.
- the communication method between the onshore (shore-based) GPS main station and the GPS slave station on the ship may be, for example, that the GPS main station on the shore transmits the signal directly to the ship in a manner of broadcasting or orientation.
- Base) GPS slave station may be, for example, that the GPS main station on the shore transmits the signal directly to the ship in a manner of broadcasting or orientation.
- the shore-based GPS main station adopts the remote method to transmit the location data to a transmission point (for example, a berth or a transmission point near the berth) in a wireless or wired manner, and then The location data is wirelessly transmitted from the transmission point to the ship-based GPS slave station at the same or different frequencies as previously described.
- the manner of setting the GPS signal receiving module may also be that all (at least two GPS signal receiving modules) are disposed on the ship to be berthed.
- the data processing module is electrically connected to the solar blind ultraviolet imaging module and the GPS signal receiving module, respectively, for processing data from each of the foregoing modules, and calculating the ship according to the received data of the solar blind ultraviolet imaging module.
- the coordinate value and based on the position information received by the GPS signal receiving module from the satellite concerned, determines the attitude angle of the vessel relative to the shoreline or berth.
- the data processing module further integrates the coordinate data or the attitude angle data received by the two solar blind ultraviolet imaging modules by using a normalized autocorrelation algorithm.
- the specific steps include: when the coordinate data is integrated, the x-axis coordinates of the position of the solar blind ultraviolet receiving module are respectively represented by x, y, and z, and represented by a vector p i (x i , y i , z i )
- the i-th group positioning data of the N sets of angular and spatially transformed positioning data returned by the N systems, where i 1, 2, 3...N; where N is the source of the original position data used
- the angled and spatially transformed positioning data is obtained by using spatial positional relationship and spatial geometric transformation under the condition that the relative positions of all the solar blind ultraviolet receiving modules and the GPS signal receiving modules and the ship attitude angle are known.
- the position measurement data of different measurement modules is converted into position measurement data for the same measurement module.
- the specific transformation method is:
- the reference point may be a location of any one of the day blind ultraviolet receiving module and the GPS signal receiving module, or may be another point;
- the normalized autocorrelation coefficient NCC is used to indicate the credibility of each system to return positioning data.
- the expression is as follows:
- the fitted ship attitude angle data is converted according to the coordinate values after the fitting of the N-1 GPS signal receiving modules.
- the integration processing of the ship position data may be performed only by integrating the position data obtained by the GPS signal receiving module, or may be a combination of position data obtained by using the sun blind ultraviolet module and position data obtained by using the GPS signal receiving module.
- the integration process is performed to obtain the fitted position data about the ship.
- the data fusion algorithm can also be used to integrate the obtained coordinate data or attitude angle data.
- the position data obtained by the daily blind UV module is relatively accurate and can currently be achieved not less than the centimeter level.
- the position data obtained by the GPS signal receiving module has a lower precision, and can only reach the decimeter level at present. Therefore, if the accuracy is relatively consistent, the GPS signal receiving module normalizes the coordinate data received from the satellite, and the effect is better.
- the distance between the GPS signal receiving modules can be made larger. To reduce the systematic error of the measured coordinates and angle data.
- the distance between the GPS signal receiving module and the sunblind ultraviolet module can be made larger to reduce the measured coordinate and angle data. system error.
- the solar blind ultraviolet receiving module can be calibrated before the measurement to determine the photoelectric parameters related to the measurement of the solar blind ultraviolet camera.
- the system photoelectric parameters involved in the calibration include: the focal length f x , f y in the x and y directions, the reference points c x , c y on the image plane, and the radial distortion coefficients in the x and y directions. k x ,k y .
- the ship's power control system is linked with the navigation system to periodically receive the berth distance signal of the sun blind ultraviolet light module, and continuously and automatically adjust accordingly.
- the invention also discloses a ship berthing system.
- the ship berthing system comprises a sunblind ultraviolet imaging module disposed on the ship, and measuring the ship and the relevant berth according to the received optical signal of the array of solar blind ultraviolet light sources arranged in advance on the shore.
- a data processing module electrically connected to the solar blind ultraviolet imaging module, processing received data of the sun blind ultraviolet module to obtain coordinates of the ship, and further comprising: at least two GPS signal receiving a module, wherein at least one GPS signal receiving module is mounted on the vessel, each GPS signal receiving module comprising a satellite signal receiving portion for receiving a positioning signal from an associated satellite, and transmitting the received satellite signal to the a signal transmitting portion of the data processing module; and the data processing module is electrically coupled to the GPS signal receiving module and processes the positioning data they receive from the satellite concerned; and determines the attitude angle of the vessel accordingly.
- all of the GPS signal receiving modules described in the ship berthing system of the present invention may be all installed on the ship.
- Another preferred way of the ship berthing system of the present invention is to include at least one GPS signal receiving module mounted on the vessel as a ship-based GPS signal receiving module.
- Each ship-based GPS signal receiving module cooperates with a GPS signal receiving module disposed on the shore to form a GPS differential system.
- the GPS signal receiving module on the shore serves as a GPS master station, and the GPS signal receiving module on the ship acts as a GPS slave station; the GPS slave station receives its own location data from the relevant satellite, and receives the GPS from the GPS master station.
- the location data of the primary station and other data that facilitates the accuracy of the GPS slave station location data, and processes the data or sends the data to the data processing module for processing to obtain a position and attitude indicative of the vessel Angle data.
- the sunblind ultraviolet imaging module and the ship-based GPS signal receiving module can be used to obtain a more accurate representation.
- Ship's Position values that determine the position of the vessel relative to the berth and the attitude angle.
- a plurality of ship-based GPS signal receiving modules obtain an attitude angle of the ship relative to the berth.
- Another way is that if the accuracy of the GPS differential system is sufficiently high, the positioning information of any ship-based GPS signal receiving module can be used as the position information of the ship, and the sun blind ultraviolet imaging module or other ship-based GPS is used.
- the position information of the signal receiving module is converted into the attitude angle of the ship; or, the position information of the ship-based GPS signal receiving module for positioning and one of the sunblind ultraviolet imaging module or other ship-based GPS signal receiving module is utilized.
- the position information of the ship is converted into the attitude angle of the ship.
- the method and system of the present invention may process the data obtained by the sunblind ultraviolet imaging module and/or the plurality of GPS signal receiving modules using a normalized autocorrelation algorithm.
- the threshold of the average value of all system credibility and the credibility of each module can be obtained through the overall error analysis.
- the threshold value is used to filter out the less reliable positioning data, and then the final credibility weight of each module is obtained, and then the weighted average of each module is obtained by using the credibility weight to obtain the final data.
- the normalized autocorrelation algorithm can be solidified into the system in the form of hardware (e.g., IC, ASIC, or FPGA) and/or software when preparing the system of the present invention and becomes an integral part of the system of the present invention.
- the data processing module adopts a data fusion algorithm on the design of the hardware and software, and integrates the obtained coordinate data or attitude angle data.
- the data fusion algorithm may be, for example, determining the credibility of the data returned by each subsystem by using a root-mean-square-error actually calculated by each subsystem measurement data.
- rmse represents the root mean square error
- x i represents the measured data of the X-axis coordinates of each measurement subsystem at time i
- x f represents the filtered value of the x i data at time i
- n represents the total number of measured data, ie the subsystem The number of times; the filtered value at time i is obtained by the Kalman filtering method
- ⁇ is the weight
- parameter b is the minimum value of the judgment field
- ⁇ and ⁇ are the mean and square of the normal distribution, respectively; since the normal curve exhibits the decreasing function in the region of x> ⁇ , ⁇ is taken here, and the semi-normal curve is actually used.
- the formula further becomes as follows:
- the ⁇ value is given, and the method of fitting the weight distribution through the normal curve can be obtained by the following formula:
- rmse ki represents the root mean square error of the i-th system at time k
- a ki represents the weight of the i-th system at time k
- x ki represents the measurement data obtained at time k of each subsystem
- the position measurement data of different measurement modules are converted into position measurement data for the same measurement module;
- a) calculating the standard deviation of each coordinate sequence in the positioning data by calculating the standard deviation of each coordinate sequence in the N sets of positioning data returned by the N detecting subsystems, as determining the outlier data in each coordinate sequence in the N sets of data According to; the standard deviation of the coordinate sequence is:
- ⁇ index represents the standard deviation of each coordinate sequence in the N sets of data
- X index represents the data of the N sets of measurements, and each set contains coordinate values (x, y, z)
- An average value representing N sets of data that is, a one-dimensional vector composed of average values of respective coordinate sequences
- outliters represents the obtained outlier data
- a set of coordinate data consisting of x, y, z, as long as one of them sits If the target value is judged as outlier data in the sequence in which it is located, the set of coordinate values is determined as outlier data in the N sets of coordinate data;
- c is a constant coefficient, which is determined according to experimental experience and requirements.
- the determining method may be to determine the fluctuation range of the test value by a large number of tests, and take a symmetrical range centered on the mean value of the test value so that a large number of unreasonable points appear outside the range, and half of the length of the range is C;
- the algorithm flow includes: (1) calculating the standard deviation of each coordinate sequence in the positioning data, (2) obtaining the outlier data in each coordinate sequence according to the calculated standard deviation, and (3) removing the deviation from the original measurement data. Group points, (4) Calculate the final positioning data using the average weighted data fusion method to obtain the y amount.
- the position data obtained by the day blind ultraviolet light receiving module is generally used as the main basis for the ship position.
- the accuracy of the positioning data of the GPS system is comparable to the positioning accuracy of the solar blind ultraviolet receiving module, the position data obtained from the GPS system can be completely used as the desired position of the method and device of the present invention.
- the main basis of the angle information is generally used as the angle information.
- the invention utilizes the daily blind ultraviolet imaging method to determine the position information of the ship relative to the berth; and at the same time, using the GPS method, using at least two GPS receivers to determine the attitude angle of the ship relative to the berth can effectively solve the problem when the visibility is very low.
- the ship can be safely berthed when it is close to the shore.
- the normalized autocorrelation algorithm and the data fusion algorithm may be preferably used to integrate the coordinate data and the angle data received by the solar blind ultraviolet imaging module and the GPS signal receiving module. To improve positioning accuracy.
- the ship auxiliary berthing method and system of the present invention can obviously solve the difficulty of berthing in a foggy day under the current technology and the influence of weather and environment on the navigational berthing device of the ship in the current technology. Big problem. Even in foggy days, it can provide pilots with more intuitive, accurate and safe navigation information, which is convenient for pilots to pilot the ship in foggy days, and also solves the problem of smooth navigation of foggy waterway and port logistics.
- Figure 1 is a system block diagram of the ship berthing navigation of the present invention
- Figure 5 shows the position of the blind UV lamp array
- Figure 6 (a) lattice coordinate system and (b) camera coordinate system;
- Figure 8 is a schematic view of the ship and the shoreline
- Figure 9 is a schematic diagram of the position of the measurement module
- Figure 10 normalizes the autocorrelation algorithm flow.
- a system can be provided for enhancing the close-range navigation capability of a ship in a foggy day, the system can display a schematic diagram of the ship and the shoreline and position information, and the pilot can achieve low through the output interface of the display device. Ships under visibility conditions are berthed.
- the system block diagram of the ship berthing navigation is shown in FIG. 1 , and the present invention mainly solves the problem that the ship is berthed at a short distance in the foggy day.
- the ship navigation system of the embodiment includes the sun blind UV lamp group 101 and two GPS modules. 112 and 113, day blind ultraviolet imaging module 103, data processing module 104, display device 105.
- the GPS modules 112, 113 and the day blind ultraviolet imaging module 103 are respectively mounted on the ship.
- the location of the differential GPSs 112 and 113 is preferred for the location that is most convenient for determining heading.
- the two differential GPSs are respectively installed on the decks on both sides of the cab, and the connection between the two may be substantially perpendicular to the connection between the head and the tail of the ship.
- Two differential GPS modules, the primary GPS module (also referred to as the primary station) 112 are mounted near the shoreline, and the GPS module (also referred to as the secondary station) 113 is mounted at a location remote from the shoreline.
- the sunblind UV imaging module 103 is mounted on the deck on the side of the ship.
- the position on the ship marked with the distance from the bow and the stern is preferably selected, and the distances of the solar blind ultraviolet module from the stern of the bow are respectively L 1 , L 2 , which are known, and Marked on the ship.
- the specific installation location is roughly as shown in Figure 2.
- the gray area 100 in Figure 1 is the shoreline where the vessel is to be moored.
- the day blind ultraviolet imaging module 103, the signal processor 104, and the display device 105 can be integrated.
- the data processing module 104 includes an information collection module, a calculation module, and a storage module.
- the main steps of this embodiment are as follows: the following steps 1-3 are preparations on the shore, and 4-5 are work performed on the ship. 1.
- Step 1-1-1 arranging the ultraviolet light array
- Step 1-1-2 measuring the geometric information of the ultraviolet light array
- Step 1-2 the ultraviolet light array is used to shoot the ultraviolet light array, and the ultraviolet light array and the shooting position are shown in FIG. 4,
- Step 2-1 coordinate extraction
- Step 2-2 obtain the internal parameters of the device, obtain the image plane coordinates of the specified ultraviolet light source, and obtain a phase by using a calibration algorithm.
- the angle ⁇ of all berth shorelines of the berthing port and a certain direction is measured in advance.
- differential GPS including master and slave
- other yaw angle measurement tools to measure the yaw angle of the berth coastline.
- its master station and slave station can be placed on the first and last sides of the berth respectively, and the distance from the berth shore line is approximately equal.
- Arranging the ultraviolet light source array and measuring the position information of the light array a period of time before the ship is berthed (for example, half an hour), the target light array is arranged near the berth berth 100 by the solar blind ultraviolet light group 101, and the shape of the target light array In the square grid shape, the size of the target light array and the number of lamps are not limited. In the embodiment, the arrangement shown in FIG. 5 is adopted, the size of the light array is 8 m ⁇ 8 m, and the spacing of the lamps in each row is equal, and the row spacing is equal.
- the distance between the reference point of the lamp array and the berthing tail string is arranged as L 2 (measured by a measuring tool such as a tape measure, wherein L 2 is the distance from the stern of the solar blind ultraviolet imaging module 103, which is known.
- set to L 2 is to make the ship berth when the day blind ultraviolet detector can face the lamp array to determine the X direction of the ship relative to the berth, of course, can also be set to other distance L n , as long as know L 2 and L n
- the distance between the two can be set; when the lamp array is arranged, the vertical distance between the first row of the lamp array and the anti-collision fender is L (also measured by a simple length measuring tool such as a tape measure), as shown in FIG. 5.
- the slave station GPS 113 transmits its own position latitude and longitude information to the master station GPS 112.
- the master station GPS 112 obtains the distance between the two by the slave station GPS 113 and its own latitude and longitude information, and also obtains the slave station GPS 113 pointing to the master station GPS 112.
- the angle r between the vector r and the true north direction, and the angle ⁇ between the r and the horizontal direction, ⁇ is the roll angle of the ship.
- the angle ⁇ between the berth shoreline and the true north direction is determined in advance, and the angle a and a ⁇ - ⁇ of the ship heading and the berthing shore line can be obtained from the angle ⁇ and the angle ⁇ , and displayed on the display device in the form of an image. 105 on.
- the solar blind UV imaging module can clearly identify all the solar blind ultraviolet signals.
- the image processed by the solar blind ultraviolet imaging module 103 is subjected to image processing and coordinate change by the signal processor 104, and the position information X, Y and Z of the solar blind ultraviolet imaging module 103 in the lamp array coordinate system are obtained.
- R is the rotation matrix and T is the translation vector
- the coordinates of the camera in the target lattice coordinate system and the direction of rotation can be obtained by knowing the lattice coordinates and image plane coordinates in the camera internal parameter and the target lattice coordinate system (see Figure 6):
- the internal parameters (f x , f y , c x , c y ) and the lattice coordinates (X, Y, Z) in the target lattice coordinate system are fixed values.
- the image plane coordinates (u, v) are acquired by the image in real time, so the rotation matrix R 0 and the translation vector T 0 corresponding to the same time (u 0 , v 0 ) can be obtained in real time.
- the inverse matrix R 0 -1 of the rotation matrix is the rotation of the camera coordinate system relative to the target lattice coordinate system, which can be reduced to a rotation vector by transformation, which is the rotational Euler angle of the camera relative to the target lattice coordinate system.
- the target lattice coordinates are the results of the artificially measured measurements, while the internal parameters represent the inherent parameters of the camera itself: f x , f y are horizontal and vertical respectively The number of pixels in the straight direction is the focal length value of the unit of measure, and c x and c y are the pixel coordinates imaged on the image plane directly in front of the center of the camera lens (ie, the point on the theoretical optical axis).
- Perform scene simulation that is, output navigation schematic and position coordinate information to the display device 105, and the berth software execution flow chart is as shown in FIG. 7.
- the information of the berthing berth is input, including the berth number, and the direction information of the ship when docked and the shoreline is left or right; the position information L 1 of the sunblind ultraviolet imaging module on the ship is input.
- L 2 , L 1 and L 2 are the distances of the sunblind ultraviolet imaging module from the bow and the stern respectively; the width B of the input ship;
- the position information X and Y of the ship in the lamp array coordinate system the direction information ⁇ - ⁇ of the ship relative to the shore line, the position information L 1 and L 2 of the sun blind ultraviolet imaging module relative to the ship, the ship width B, can be displayed on the display device 105 shows the upper vessel and a schematic view of the shoreline and the position information Y and Y tail first, as shown in FIG. 8; the pilot output through the display device interface can be realized berthing at low visibility conditions.
- This embodiment relates to how to obtain optimal position information in multiple sets of data, and the algorithm is as follows:
- the angled and spatially transformed positioning data is obtained by using spatial positional relationship and spatial geometric transformation under the condition that the relative positions of all the solar blind ultraviolet receiving modules and the GPS signal receiving modules and the ship attitude angle are known.
- the position measurement data of different measurement modules is converted into position measurement data for the same measurement module.
- the specific transformation method is:
- the reference point may be a location of any one of the day blind ultraviolet receiving module and the GPS signal receiving module, or may be another point;
- the measurement coordinates of the two measurement modules are p 1 (x 1 , y 1 , z 1 ) and p 2' (x 2' , y 2' , z 2' ), respectively, and let p 1 be the reference.
- the distance between the two measured is L
- the angle of the heading angle of the two lines is ⁇
- the pitch angle is (angle with the XY plane)
- the algorithm uses the normalized Correlation Coefficient to represent the credibility of each system to return positioning data.
- the expression is as follows:
- the threshold is set to 80% of the average of all system credibility, and the threshold G can be expressed as follows:
- the lower positioning data of the NCC is filtered out, and the final system credibility weight w is obtained, and the expression is as follows:
- Zhang Zhengyou calibration method uses a checkerboard calibration template to use the connection point of each black and white square on the calibration template as the feature point of the calibration plate. Place the calibration plate in different positions, and the camera will acquire the internal and external parameters of the camera after synchronous acquisition.
- the method has better robustness and does not require expensive instruments and equipment, and is convenient to operate, and the precision is improved relative to the self-calibration method.
- all the calibration methods satisfying the embodiment and the algorithms for solving the internal parameters should be included.
- the calibration process is shown in Figure 3.
- the 1-1-1 UV array is arranged, the 1-1-2 measurement is used to obtain the geometric information of the UV array, and the 1-2 UV receiver is used to capture the UV array.
- the software processing includes 2 -1 obtains the image plane coordinates of the specified ultraviolet light source, and 2-2 uses the calibration algorithm to solve the internal parameters of the camera.
- the specific calibration steps are as follows:
- the 1-1-1 ultraviolet light array is arranged, and the ultraviolet light array adopts a planar rectangular grid-like ultraviolet light array, and the ultraviolet light array and the shooting position are shown in FIG. 4 .
- the shape and size of the ultraviolet light array are not constrained.
- the ultraviolet light array may be a flat graphic or a solid graphic; it may be a rectangular structure or a circular structure or other geometric shapes.
- the geometric information of the ultraviolet light array refers to the coordinates of a specific ultraviolet light spot or corner point in the world coordinate system.
- the selected shooting position A should satisfy the following conditions: different shooting positions, different OA pointing directions are not parallel, and n groups are taken, in this embodiment n should be greater than 3.
- the 2-1 signal processor 104 performs software processing on the captured digital image to obtain an image plane coordinate group of specific ultraviolet light spots, ci 1 , ci 2 , ci 3 ... ci n , a total of n groups.
- f x , f y is the focal length in pixels in the x and y directions
- c x , c y are reference points on the image plane
- k x , k y are radial distortion coefficients in the x and y directions.
- A is determined by f x , f y , v 0 , u 0 , s , which is the internal parameters of the camera and is only related to the internal structure of the camera; H is called the external parameter of the camera and directly reflects the position of the camera in space.
- S is the magnification factor
- s -f x cot ⁇
- f x f / ⁇ x
- f y f / ⁇ y
- f is the focal length of the lens.
- [X w , Y w , Z w , 1] T is the world coordinate of any object point in space
- [u, v, 1] T represents the pixel coordinates of the image point of the object point in the camera.
- the translation matrix T [T x ,T y ,T z ] T is a 4 ⁇ 4 matrix; the rotation matrix R is a 3 ⁇ 3 orthogonal unit matrix, the translation matrix T and the rotation matrix R(r 1 r 2 r 3 ) Called an external parameter.
- B is a positive definite symmetry matrix, defined as:
- v ij [h 1i h 1j h 1i h 2j +h 2i h 1j h 2i h 2j h 3i h 1j +h 1i h 3j h 3i h 2j +h 2i h 3j h 3i h 3j ] T (15)
- V is a 2n ⁇ 6 matrix.
- b has a unique solution, which means at least three pictures are to be acquired.
- the parameter optimization is performed according to the maximum likelihood criterion, and the objective function is:
- the optimization can be solved using the LM optimization algorithm.
- the method and device of the invention determine the position information of the ship relative to the berth by using the daily blind ultraviolet imaging method, and determine the attitude angle of the ship relative to the berth by the differential GPS method, which can effectively solve the problem that the ship is close to the shore when the visibility is very low. It is safe to berth at the side.
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Abstract
Description
Claims (17)
- 一种船舶辅助泊岸方法,包括在船舶上设置一个日盲紫外成像模块和一个数据处理模块,日盲紫外成像模块根据所接收到的、预先在岸上设置的日盲紫外光源阵列发出的日盲紫外光信号,测量所述船舶与有关泊位的位置关系信息,其特征在于,该方法还包括:1)设置至少两个GPS信号接收模块,其中至少一个GPS信号接收模块设置在所述船舶上,用于从有关卫星接收所述船舶的位置信号;2)所述数据处理模块包括信号接收元件,可以有线和/或无线方式与所述日盲紫外成像模块和所述GPS信号接收模块匹配,并从所述日盲紫外成像模块和所述GPS信号接收模块中接收与船舶位置有关的数据,计算出所述船舶基准点的坐标值,并且根据所述日盲紫外成像模块和安装在所述船舶上的GPS信号接收模块的位置数据,确定所述船舶相对于泊位岸线的姿态角。
- 如权利要求1所述的一种船舶辅助泊岸方法,其特征在于:在所述船舶上安装两个以上的GPS信号接收模块,用于分别接收有关卫星的定位信号,并且根据船舶上的GPS信号接收模块的连线,确定所述船舶相对于泊位岸线的姿态角。
- 如权利要求1所述的一种船舶辅助泊岸方法,其特征在于:在岸上设置至少一个GPS信号接收模块,每个船舶上的GPS信号接收模块与岸上的GPS信号接收模块协同工作,构成GPS差分系统,其中岸上的GPS信号接收模块作为GPS主站,船舶上的GPS信号接收模块作为GPS从站,利用所述GPS主站来增进GPS从站对于船舶位置和姿态角数据的测量精度;并且所述GPS主站,从有关卫星上接收位置数据后,可以直接发给数据处理模块,得到所述船舶的位置数据,也可以将所述位置数据以及有利于增进GPS从站位置数据精度的其它数据先发送到至少一个GPS从站,GPS从站整合所收到的GPS位置接收数据后,对所述数据进行处理,再将数据发送到所述数据处理模块,得到所述船舶的位置数据。
- 如权利要求3所述的一种船舶辅助泊岸方法,其特征在于:所述GPS主站将其位置数据以无线或有线的方式,先发送至一个发射点,再从该发射点以与之前相同或不同的频率,将位置数据无线地发送至所述GPS从站。
- 如权利要求2至4之一所述的一种船舶辅助泊岸方法,其特征在于:在所述船舶上安装两个以上的GPS信号接收模块,数据处理模块将所述日盲紫外成像模块与所述船舶上的GPS信号接收模块所得到的N个关于船舶的位置数据进行归一化自相关处理:通过整体误差分析获得一个由所有日盲紫外成像模块和GPS信号接收模块组成的检测系统的可信度平均值的阈值,以及每个模块可信度的情况,利用该阈值滤除可信度较低的定位数据,进而获得最终的每个模块的可信度权重,之后利用该可信度权重对每个模块进行加权平均即可得到最终的数据。
- 如权利要求5所述的一种船舶辅助泊岸方法,其特征在于:所述日盲紫外成像模块以及GPS信号接收模块所在位置的坐标值用x、y和z分别表示,用向量pi(xi,yi,zi)表示由N组检测子系统返回的N组经角度和空间变换后的定位数据中的第i组定位数据,其中i=1,2,3……N;N=GPS信号接收模块的个数+1;所述经角度和空间变换后的定位数据,其获得方法为:在已知所有日盲紫外成像模块和GPS信号接收模块的相对位置和船舶姿态角的情况下,利用空间位置关系与空间几何变换,将对不同测量模块的位置测量数据转化为对同一测量模块的位置测量数据;数据处理模块进行归一化自相关处理的具体步骤为:采用归一化自相关系数NCC表示N组检测子系统返回定位数据的可信度:j=1,2,3,…,N;设定一个由所有日盲紫外成像模块和GPS信号接收模块组成的检测系统的可信度平均值的阈值G,并根据该阈值G滤除NCC较低的定位数据,进而获得最终的系统可信度权重w,表达式如下:从而得到关于船舶位置的最终的拟合定位数据:根据所述N-1个GPS信号接收模块拟合后的坐标值,换算出拟合后的船舶姿态角数据。
- 如权利要求2至4之一所述的一种船舶辅助泊岸方法,其特征在于:所述数据处理模块采用数据融合法,分别用于整合定位数据或者姿态角数据;所述数据融合法具体步骤包括:(一)当整合的数据为定位数据时,使用向量pi(xi,yi,zi)表示由N组检测子系统返回的N组经角度和空间变换后的定位数据,其中i=1,2,3……N;所述经角度和空间变换后的定位数据,其获得方法为:在已知所有日盲紫外成像模块和GPS信号接收模块的相对位置和船舶姿态角的情况下,利用空间位置关系与空间几何变换,将对不同测量模块的位置测量数据转化为对 同一测量模块的位置测量数据;a)采用各个检测子系统测量数据实际计算出来的均方根误差rmse来判定每个子系统返回数据的可信度,计算各子系统测量数据的均方根误差公式为:其中,rmse代表均方根误差,xi代表i时刻对各个测量子系统在X轴坐标的测量数据,xf代表i时刻对xi数据的滤波值,n代表测量数据的总数,即子系统的个数;i时刻的滤波值通过卡尔曼滤波方法获得;b)确定权值:采用分段法,通过曲线拟合进行权值的分配:其中,ω为权值,参数b是判断野值的最小限度,参数a是有效数值与可利用数值的界限值。误差大于b则认为是野值,对应权值为0;误差小于a则认为是有效值,对应权值为1,中间的可利用值的权值按照曲线y=f(x)给出,且f(x)必须满足以下条件:在(a,b)这个区间上,随着误差的增大而迅速减小,f(x)采用的表达式如下:其中,μ和σ分别为正态分布的均值和方;由于正态曲线在x>μ的区域呈现递减函数的特性,因此在这里取μ=0,实际上运用的是半正态曲线,表达式进一步变为如下:,根据3σ法则给出σ值,通过正态曲线拟合权值分配的方法可以通过下式得到:c)最终数据融合的结果为:d)通过以上与步骤a)-c)相同方法,计算出Y轴坐标值y以及Z轴坐标值z的数据融合最终结果;(二)当整合的数据为姿态角数据时,使用向量qi(αi,βi,γi)表示由N个测量子系统返回的N组姿态角数据,其中i=1,2,3……N;然后采用与步骤(一)相同的方法,计算出整合后的姿态角数据。
- 如权利要求2至4之一所述的一种船舶辅助泊岸方法,其特征在于:所述数据处理模块采用数据融合法,分别用于整合定位数据或者姿态角数据;所述数据融合法具体步骤包括:(一)当整合的数据为定位数据时,使用向量pi(xi,yi,zi)表示由N组检测子系统返回的N组经角度和空间变换后的定位数据,其中i=1,2,3……N,所述的经角度和空间变换后的定位数据,其获得方法为在已知所有日盲紫外成像模块和GPS信号接收模块的相对位置和船舶姿态角的情况下,利用空间位置关系与空间几何变换,将对不同测量模块的位置测量数据转化为对同一测量模块的位置测量数据;a)计算定位数据中每个坐标序列的标准差:通过计算N组检测子系统返回的N组定位数据中每个坐标序列的标准差,作为判定N组数据中各坐标序列中离群数据的依据;所述坐标序列标准差为:其中,index∈(x,y,z)则σindex代表N组数据中各坐标序列的标准差,Xindex代表N组测量的数据,每一组包含坐标值(x,y,z),代表N组数据的平均值,即由各坐标序列平均值组成的一个一维向量;b)根据计算出的标准差得到每个坐标序列中的离群数据,离群数据的判定可通过下式获得:其中,outliters代表获得的离群数据,由x,y,z组成的一组坐标数据中,只要其中有一个坐标值在其所在的序列中被判为离群数据,则该组坐标值就被判定为N组坐标数据中的离群数据;c为常系数,根据实验经验和需求而定,该常数的确定方法可以是通过大量的测试判断测试值的波动范围,取一以测试值均值为中心的对称范围使大量出现的不合理的点在该范围外,该范围长度的一半即为C;c)将离群数据从N组原始测量数据中剔除,则得到新的定位数据序列称为X′维数为N′,之后对X′进行等权平均数据融合得到最终的融合数据如下:d)通过以上与步骤a)-c)相同方法,计算出Y轴坐标值y以及Z轴坐标值z的数据融合最终结果;(二)当整合的数据为姿态角数据时,使用向量qi(αi,βi,γi)表示由N组检测子系统返回的N组姿态角数据,其中i=1,2,3……N;然后采用与步骤(一)相同的方法,计算出整合后的姿态角数据。
- 如权利要求1-4中任一权利要求所述的一种船舶辅助泊岸方法,其特征在于:在测量前先对日盲紫外成像模块进行标定,确定所述日盲紫外成像模块与测量有关的光电参数。
- 如权利要求9所述的一种船舶辅助泊岸方法,其特征在于:所述日盲紫外成像模块与测量有关的光电参数包括x轴和y轴方向上以像素为单位的焦距fx,fy,像面上的基准点位置cx,cy,以及x轴与y轴方向上的径向畸变系数kx,ky。
- 如权利要求1-4中任一权利要求所述的一种船舶辅助泊岸方法,其特征在于,船舶的动力控制系统接受由数据处理模块传输的所述日盲紫外光源阵列的泊岸距离信号,并据此自动地调整船舶的姿态,进行泊岸。
- 一种船舶辅助泊岸系统,包括一个日盲紫外成像模块,设置在船舶上,根据所接收到 的、预先在岸上设置的日盲紫外光源阵列的光信号,测量所述船舶与有关泊位的位置关系信息;一个数据处理模块,与所述日盲紫外成像模块电气地连接,对所述日盲紫外成像模块的接收数据进行处理,得到所述船舶的坐标,其特征在于,该系统还包括:至少两个GPS信号接收模块,其中至少一个GPS信号接收模块被安装在所述船舶上,每个GPS信号接收模块包括用于从有关卫星上接收定位信号的卫星信号接收部分,以及将所接收的卫星信号传送到所述数据处理模块的信号传送部分;所述数据处理模块与所述GPS信号接收模块电气地连接,并处理GPS信号接收模块从有关卫星所接收的定位数据,并据此确定所述船舶的姿态角。
- 如权利要求12所述的一种船舶辅助泊岸系统,其特征在于:安装在所述船舶上的GPS信号接收模块与设置在岸上的GPS信号接收模块协同工作,构成GPS差分系统,其中岸上的GPS信号接收模块作为GPS主站,船舶上的GPS信号接收模块作为GPS从站;所述GPS从站从有关卫星上接收自身的位置数据,并且从所述GPS主站接收所述GPS主站的位置数据以及其它有利于增进GPS从站位置数据精度的数据,并对这些数据进行处理或将这些数据发送到所述的数据处理模块中进行处理,得到表示所述船舶的位置和姿态角数据。
- 如权利要求13所述的船舶辅助泊岸系统,其特征在于:所有的GPS信号接收模块都被安装在所述船舶上。
- 如权利要求14所述的船舶辅助泊岸系统,其特征在于:所述数据处理模块采用归一化自相关算法对所述日盲紫外成像模块以及GPS信号接收模块得到的坐标值进行整合处理,用x、y和z分别表示日盲紫外成像模块以及两个GPS信号接收模块所在位置的三轴坐标,用向量pi(xi,yi,zi)表示由N组检测子系统返回的N组经角度和空间变换后的定位数据中的第i组定位数据,其中i=1,2,3……N;N=GPS信号接收模块的个数+1;所述经角度和空间变换后的定位数据,其获得方法为:在已知所有日盲紫外成像模块和GPS信号接收模块的相对位置和船舶姿态角的情况下,利用空间位置关系与空间几何变换,将对不同测量模块的位置测量数据转化为对同一测量模块的位置测量数据;所述数据处理模块进行归一化自相关处理的具体步骤为:采用归一化自相关系数NCC表示N组检测子系统返回定位数据的可信度:j=1,2,3,…,N;设定一个由所有日盲紫外成像模块和GPS信号接收模块组成的检测系统的可信度平均值 的阈值G,并根据该阈值G滤除NCC较低的定位数据,进而获得最终的系统可信度权重w,表达式如下:从而得到关于船舶位置的最终的拟合定位数据:根据所述N-1个GPS信号接收模块拟合后的坐标值,换算出拟合后的船舶姿态角数据。
- 如权利要求14所述的船舶辅助泊岸系统,其特征在于,所述数据处理模块采用数据融合法对所述GPS信号接收模块所接收到的坐标数据进行整合处理,或者将所述GPS信号接收模块测得的坐标数据与所述日盲紫外成像模块所测量到的坐标数据进行整合处理;或者对所述GPS信号接收模块所接收到的姿态角数据进行整合处理;所述数据融合法具体步骤包括:(一)当整合的数据为定位数据时,使用向量pi(xi,yi,zi)表示由N组检测子系统返回的N组经角度和空间变换后的定位数据,其中i=1,2,3……N;所述经角度和空间变换后的定位数据,其获得方法为:在已知所有日盲紫外成像模块和GPS信号接收模块的相对位置和船舶姿态角的情况下,利用空间位置关系与空间几何变换,将对不同测量模块的位置测量数据转化为对同一测量模块的位置测量数据;a)采用各个检测子系统测量数据实际计算出来的均方根误差rmse来判定每个子系统返回数据的可信度,计算各子系统测量数据的均方根误差公式为:其中,rmse代表均方根误差,xi代表i时刻对各个测量子系统在X轴坐标的测量数据,xf代表i时刻对xi数据的滤波值,n代表测量数据的总数,即子系统的个数;i时刻的滤波值通过卡尔曼滤波方法获得;b)确定权值:采用分段法,通过曲线拟合进行权值的分配,:其中,ω为权值,参数b是判断野值的最小限度,参数a是有效数值与可利用数值的界限值。误差大于b则认为是野值,对应权值为0;误差小于a则认为是有效值,对应权值为1,中间的可利用值的权值按照曲线y=f(x)给出,且f(x)必须满足以下条件:在(a,b)这个区间上,随着误差的增大而迅速减小,f(x)采用的表达式如下:其中,μ和σ分别为正态分布的均值和方;由于正态曲线在x>μ的区域呈现递减函数的特性,因此在这里取μ=0,实际上运用的是半正态曲线,表达式进一步变为如下:,根据3σ法则给出σ值,通过正态曲线拟合权值分配的方法可以通过下式得到:c)最终数据融合的结果为:d)通过以上与步骤a)-c)相同方法,计算出Y轴坐标值y以及Z轴坐标值z的数据融合最终结果;(二)当整合的数据为姿态角数据时,使用向量qi(αi,βi,γi)表示由N组检测子系统返回的 N组姿态角数据,其中i=1,2,3……N;然后采用与步骤(一)相同的方法,计算出整合后的姿态角数据。
- 如权利要求13-16之一所述的船舶辅助泊岸系统,其特征在于,所述船舶的动力控制系统接受由数据处理模块传输的所述日盲紫外光源阵列的泊岸距离信号,并据此自动地调整船舶的姿态,进行泊岸。
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US11920912B2 (en) * | 2021-12-08 | 2024-03-05 | Ship And Ocean Industries R&Dcenter | Automatic berthing image ranging system for vessels and operation method thereof |
CN114501364A (zh) * | 2022-02-22 | 2022-05-13 | 成都市联洲国际技术有限公司 | 基于wifi信号的室内定位方法、装置以及电子设备 |
CN114501364B (zh) * | 2022-02-22 | 2023-12-22 | 成都市联洲国际技术有限公司 | 基于wifi信号的室内定位方法、装置以及电子设备 |
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DE112015005971T5 (de) | 2017-12-14 |
JP6516111B2 (ja) | 2019-05-22 |
US20180012498A1 (en) | 2018-01-11 |
KR102049371B1 (ko) | 2020-01-22 |
JP2018503915A (ja) | 2018-02-08 |
CN105842724B (zh) | 2018-07-17 |
US10424205B2 (en) | 2019-09-24 |
CN105842724A (zh) | 2016-08-10 |
KR20170102992A (ko) | 2017-09-12 |
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