498results about "Measuring open water depth" patented technology

A system for controlling a marine vessel that includes a sonar depth finder configured to display a chart for a body of water. The chart has depth information for the body of water, and is programmed to allow a user to select from a plurality of depths indicated on the sonar depth finder display. The sonar depth finder further is configured to generate a route for the marine vessel. The route includes a path through the body of water where each point along the path is at the desired depth. The system includes a vessel control device in communication with the sonar depth finder. The vessel control device is configured to receive transmissions from the sonar depth finder. The transmissions include the route generated by the sonar depth finder. The vessel control device is further configured to automatically direct the marine vessel along the route.

A method and apparatus for measuring depth of waterways and elevation of land features through autonomous consolidation of GPS device data acquired from a plurality of mobile platforms is disclosed. The GPS device data may then be processed and compared to published reference data. A data recorder and a wireless transmission system comprise an onboard unit, which serves to interface with the GPS device for collecting, recording and transmitting data. The onboard device also provides an apparatus for collecting other georeferenced data from multiple mobile platforms, and serves as a node on a two-way meshed communication network.

The invention relates to marine hydrology parameter monitoring, and particularly discloses an optical fiber temperature-depth diving mark continuous measuring system. The system comprises a communication buoy, a main floating ball, an instrument bin, a demodulating system, a temperature-depth chain, a mooring rope, an acoustical releaser and an anchoring weight, wherein the communication buoy comprises a solar cell, a big dipper communication plate card and a satellite combined antenna; the demodulating system comprises a demodulation module and a lithium battery and is arranged in the instrument bin, and the temperature-depth chain integrates a temperature sensor and a pressure sensor for measuring temperature and pressure, and the communication buoy, the main floating ball, the instrument bin, the temperature-depth chain, the releaser and the anchoring weight are successively connected through the mooring rope. The optical depth diving mark continuous measuring system provided by the invention has the advantages that the high density, real time, continuation and long-term observation of a temperature-depth vertical section from a sea surface to 500m underwater are realized, the data is exact and reliable, and the economic benefit is high; the optical fiber temperature-depth diving mark continuous measuring system is widely applied in different marine observation operations and provides a novel observation means for measuring sea temperature-depth.

The invention discloses a distributed water depth prediction method based on GWR (geographically weighted regression) and a BP (back propagation) neural network. The method comprises the following steps: firstly, preprocessing a remote sensing image; secondly, establishing sampling data based on an actually measured water depth value acquired by a laser radar and DN (digital number) values of blue and green wavebands of corresponding coordinate points in the remote sensing image; thirdly, dividing a to-be-predicted region into a plurality of sub-regions based on the GRW method and establishing a neural network water depth predication model of each sub-region; finally, designing weighting factors of the neural network water depth prediction models of all regions around each to-be-predicted point in the to-be-predicted region to establish a distributed neutral network water depth prediction model of the whole to-be-predicted region. Therefore, the distributed water depth prediction method is not influenced by seawater quality, seabed type or space diversity, can quickly and conveniently establish a nonlinear relationship between the multispectral remote sensing image and the actual water depth value, and has a very good practical value for prediction of shallow water depth.

This invention concerns a remote control unmanned boat which can be freely operated by remote control and a remote control device. The remote control unmanned boat comprises a propelling power source 11 for generating a propelling power, a steering device 13 for freely varying the direction of advance, a first transmit-receive antenna 24 for receiving the signal transmitted by ratio from a control device 20, a first controller 15 for controlling the propelling power source 11 and the steering device 13 based on the signal received from the first transmit-receive antenna 14, a memory device 17 for memorizing the initial position set in advance, and a GPS antenna 16 for receiving the electric wave transmitted from an artificial satellite. The first controller 15 calculates the present position based on the electric wave received by the GPS antenna 16 and, when the stated condition is satisfied, initiates automatic control of the propelling power source 11 and the steering device 13 so as to attain regression to the initial position based on the present position and the initial position. Thus, the remote control unmanned boat has no possibility of being missed.

A reservoir water storage amount remote sensing and ground concurrent monitoring method is as follows: multi-period reservoir water monitoring remote sensing images can be acquired from archived satellite data sources, and the remote sensing images can be pretreated; reservoir water surface area can be extracted from the pretreated remote sensing images; ground synchronous monitoring reservoir water level can be acquired from a ground monitoring station; a correctional relation curve of the reservoir water level and the reservoir water surface area can be established; according to the correctional relation curve of the reservoir water level and the reservoir water surface area, a correctional relation curve of the reservoir water level and reservoir storage capacity can be acquired; when a new satellite data source is available, the above steps are repeated, the relation curve of the reservoir water level and the reservoir storage capacity can be updated and corrected; the reservoir water level can be monitored by the ground monitoring station, and the reservoir water storage capacity corresponding to the monitoring water level can be obtained by conversion according to the corrected relation curve of the reservoir water level and the reservoir storage capacity. The reservoir water storage amount remote sensing and ground concurrent monitoring method can effectively eliminate the influence of the characteristic curve changes of the reservoir after a long time running on reservoir water storage amount, and improves the accuracy of the reservoir water storage condition monitoring.

The invention provides a nonlinear model-based multispectral remote sensing water depth inversion method and an apparatus thereof. The method comprises the following steps: acquiring the multispectral remote sensing image of a preset area and the actually measured control point water depth of a preset water area, and preprocessing the multispectral remote sensing image to obtain a preset area reflectivity; carrying out water-land separation on the preset area reflectivity through a near infrared waveband spectrum characteristic-based threshold technique to obtain the reflectivity of the water surface of the preset water area; establishing a nonlinear inversion model corresponding to the preset water area according to the water surface reflectivity and the actually measured control point water depth; and regressing the nonlinear inversion model through a stepwise regression algorithm, and inversing according to the regressed nonlinear inversion model to obtain the water depth of the preset water area. The highly-precise water depth of the island reef water area far from the land is rapidly obtained according to the nonlinear inversion model on the basis of the actually measured water depth, model establishing and the solving process are simple, and the nonlinear inversion model is suitable for various types of water depth inversion engineering and has good portability.

The present invention discloses a shallow river water depth surveying and mapping system and method based on unmanned aerial vehicle multi-view shooting. The method comprises step S1: determining a surveying time, a surveying area and surveying precision; S2: setting ground control points GCPs in the surveying area, and using a positioning instrument to perform positioning on the control points; S3: planning a flight line of an unmanned aerial vehicle, and performing aerial shooting according to the pre-determined air line; and S4: using unmanned aerial vehicle image analysis software to process an image of the multi-view shooting in step S3, surveying an orthoimage and a digital surface elevation model of the area, and applying an optical model water depth inverse program to perform refraction correction and to perform inversion to obtain a water depth value of a shallow river. Compared with conventional GPS measurement, total station measurement and echo sounding, the method is time-saving, labor-saving and cost-saving, causes no damage to a water body and a river bed, and has relative high execution efficiency; and water depth surveying and mapping is extended from point measurement to face measurement, a relatively high spatial resolution is provided, and water depth measurement precision and a spatial resolution are also improved.

The invention discloses a shallow sea water depth inversion method based on high-spectrum data of a blue-yellow wave band. Currently, models which perform depth inversion on clean water body through an optical remote sensing facility are mostly established for aiming at multiple-spectrum data. The algorithm is restricted by wide spectrum data wave band and little spectrum information. The inversion precision is largely affected by type of water body sediment. The invention provides a novel method for inversing shallow sea water depth of the clean water body through utilizing the high-spectrum data of the blue-yellow wave band (450-610 nanometers) according to a water body optical attenuation mechanism based on the high-spectrum data. The method can accurately extract shallow sea water depth distribution information within 30 meters. Furthermore one algorithm coefficient calibration is required for one remote sensor, thereby remarkably improving universality of the algorithm.

An automatic hydrologic parameter measuring system for a river flow comprises a supporting installed below a bridge surface; a waterproof box connected to a steel rope for suspending a weight; another end of the rope extending downwards out of the waterproof box for retaining the weight; a waterproof electric wire winding around the steel rope for transferring signals to the signal processor; a water pressure meter installed in a hollow space of the weight; when the weight being in water, the water pressure meter starts the measuring process; after the weight reaches to the riverbed, the water pressure is unchangeable; and a water pressure meter installed in a hollow space of the weight; when the weight being in water, the water pressure meter starts the measuring process; after the weight reaches to the riverbed, the water pressure is unchangeable.

The invention provides a pre-warning method and device of vehicle wading. The pre-warning method includes measuring the depth of accumulated water at a position, with a preset distance, in front of a vehicle according to measurement results of a roof laser range finder, a vehicle bottom laser range finder, an ultrasonic range finder and a gyroscopic sensor; judging whether the depth of the accumulated water is larger than the safety depth of the vehicle or not; giving out a pre-warning prompt message if the depth of the accumulated water is larger than the safety depth of the vehicle. Compared with the technical scheme that the detection of the depth of the accumulated water and the pre-warning are performed after the vehicle wades in the prior art, the pre-warning method and device have the advantages that the depth of accumulated water at a position, with a preset distance, in front of the vehicle can be detected before the vehicle wades, the pre-warning can be given out when the depth of the accumulated water is larger than the safety depth of the vehicle, the vehicle wading pre-warning efficiency can be improved, and real vehicle wading pre-warning can be achieved.

An underwater depth discrepancy system and method are provided. A comparator compares an actual underwater depth with a predetermined/prerecorded chart depth corresponding to a current location corresponding to the location of the actual underwater depth. A first signal is generated when the actual underwater depth is greater than the chart depth while a second signal is generated when the actual underwater depth is less than the chart depth. The current location and actual underwater depth are recorded whenever the first or second signal is generated. In addition, one or more alarms are generated when the second signal is generated.

Disclosed is a composite hydrological monitoring system, in which a counterweight component and a test component are respectively connected to both opposite ends of a strip and a plurality of sensors are disposed at different vertical positions. Accordingly, the scour depth can be measured by sensing the location of the counterweight component, whereas the water level and/or flow velocity can be determined by signals from the sensors. When the counterweight component moves downward with sinking of the riverbed, the strip would be pulled down and thus causes the test component to present a change in mechanical energy. Accordingly, the sinking depth can be measured by sensing the change of the mechanical energy. Additionally, since the water level variation would cause signal changes of the sensors arranged in a row along a vertical direction, the change of water level can be determined accordingly.

The invention relates to an environment monitoring river patrol robot system and method. According to the environment monitoring river patrol robot system and method, a ground workstation is connectedwith a shipborne platform; the shipborne platform is provided with an intelligent control terminal; the intelligent control terminal is connected with an automatic driving unit, a wireless communication unit, a data storage unit, a radar measuring instrument, a sonar detector, a laser measuring instrument, a water quality monitor, a flow meter, a camera group and a comprehensive meteorological monitor, wherein the automatic driving unit is provided with an attitude control sensor and a satellite positioning device; the intelligent control terminal is provided with a river channel state analysis device and a fish school analysis device. With the environment monitoring river patrol robot system and method of the invention adopted, the pollution of a river is automatically monitored; besidesconventional pollution monitoring, the pollution condition of the river is generally judged through a fish swarm observation mode; detection and judgment are further conducted once problems are found; the problem that special monitoring is incomprehensive is avoided; and monitoring is simplified. The system and method of the invention have the advantages of high automation degree, strong on-siteautonomous control capability, flexible and changeable reaction capability and all-weather working capability.

The present invention provides a magnetic device for measuring scour depth. The magnetic device comprises a plurality of scour detecting units which are buried in the sediment and disposed at intervals along the direction perpendicular to the surface of water. Each scour detecting unit comprises: one or more magnetic sources; and one or more magnetic detecting elements configured to be apart from the magnetic source for a predetermined distance. The magnetic detecting element is utilized to detect the magnetic field generated by the magnetic source. The scour depth and the position where scour occurs are determined according to electronic signals corresponding to the magnetic strength detected by the respective magnetic detecting elements of the scour detecting units. The magnetic device of the present invention has many advantages including low cost, high efficiency, and such a device is easily deployed.

A method for controlling the gate based on the habitat requirement for fish overwintering in rivers. According to the characteristics of biological habitat of the river and the habitat demand of fishes during overwintering, the method specifically comprises the steps of: firstly, determining candidate fishes for ecological flow calculation though fish resources investigating and historical data, and then screening out the target fish by adopting hierarchical analysis method; Secondly, establishing a quantitative response relationship curve between target fish physiological adaptions and water temperature, obtaining ecological water level which ensures the target fish overwintering safely according to the vertical temperature distribution, and establishing the relation between water depth and discharge using hydrodynamic model; finally, setting up a gate control system including a radar water level meter in the overwintering areas and an ecological water level management system in a gate control room.

The invention discloses a dynamic precise single-point positioning method for a bathymetric survey without tidal observation, which belongs to the field of dynamic precise single-point positioning. The method is based on dynamic precise single-point positioning technology with water level constraints, projects out the elevation of a receiver antenna from the water level value of a test beginning position, introduces elevation constraining conditions into an observation equation according to the characteristic that the water level of an inland waterway does not change significantly and acquires planar and elevation information of each measuring point by using a dynamic precise single-point positioning model with elevation constraints, thereby realizing calculation of the water level value of each measuring point. The dynamic precise single-point positioning method for the bathymetric survey without tidal observation can accelerate dynamic precise single-point positioning convergence time and improve work efficiency.

A land-based automotive vehicle (10, 110) comprising an apparatus (12a, 12b) for estimating the depth of water (H) about the vehicle. The apparatus comprising at least one light source (70), at least one imaging means such as a camera (30) mounted to the vehicle and a control unit (40), the apparatus being structured and arranged such that a first light signal is emitted toward a water surface (18) about the vehicle, the at least one camera is configured for imaging the first light signal and the control unit is configured and arranged to compute from the imagery obtained by the at least one camera an estimation of a depth of water about the vehicle.

The invention relates to a multi-frequency sounding device. The multi-frequency sounding device comprises a transducer probe, a control display module, a transducer driving module, a data acquisition module and an echo signal processing module, wherein the transducer driving module is controlled by the control display module to drive the transducer probe to emit an amplitude-modulated signal, the amplitude-modulated signal can be demodulated into a low-frequency signal with the frequency twice that of an envelope signal in the amplitude-modulated signal in the transmission process, and the low-frequency signal and the original amplitude-modulated signal with the frequency unchanged reach the water bottom and then are reflected to generate echo signals; the low-frequency signal can be transmitted at the water bottom and is reflected after encountering another layer of medium interface to generate an echo signal; the reflected echo signals can be received by the transducer probe and then transmitted to the echo signal processing module through the data acquisition module, and the sounding result is calculated after the echo signals are filtered and amplified by the echo signal processing module.