42 results about "Bathymetry" patented technology

An apparatus for measuring distance to a surface is disclosed. The apparatus transmits at least one subsequent pulse of light prior to receiving a reflection of a previously sent pulse of light. Thus, multiple pulses of light are in-flight at a given time. The embodiments are applicable to terrain mapping, bathymetry, seismology, detecting faults, biomass measurement, wind speed measurement, temperature calculation, traffic speed measurement, military target identification, surface to air rangefinding, high definition survey, close range photogrammetry, atmospheric composition, meteorology, distance measurement, as well as many other applications. Examples of such apparatuses include laser ranging systems, such as light detection and ranging (LIDAR) systems, and laser scanners. Data received from the apparatus by a data processing unit can be used to create a data model, such as a point cloud, digital surface model or digital terrain model describing the surface, terrain, and/or objects.

The present invention can implement the utilization of electromagnetic depth-measuring exploration method in frequency-domain method and time-domain method. Said invention utilizes that exciting and receiving a series of frequency (period) pulses to research the law of whole spectrum, at the same time, research the signal attenuation law of every frequency (period), from short period to long period, the reflected underground informations can be progressively deepened, the superposition of these informations can raise exploration accuracy, and the time-domain and frequency-domain boty can be used for making mutual check by means of time-frequency conversion so as to greatly raise exploration accuracy. Said invention can be mainly used for making exploration of oil, gas, mineral resources and geothermal resource.

The method allows, by means of an iterative inversion algorithm, to predict the spatial distribution of the lithologic composition of sediments deposited in a sedimentary basin during a geologic time interval, and the temporal evolution of the depositional profile throughout filling of the basin, while respecting exactly the thicknesses of the sedimentary sequences measured otherwise. The input data consist of the thickness maps of the sedimentary layer studied, data relative to the location and to the composition of the sediment supply at the boundaries of the sedimentary basin studied, and physical parameters characterizing transport of the sediments during the period considered. These data are determined by interpretation of seismic surveys, by measurements and observations. This set of data is applied to an iterative inversion loop initialized by the accommodation provided by a stationary multilithologic diffusive model. This loop then works as a fixed-point algorithm correcting the accommodations by means of a preconditioning of the residue on the sequence thicknesses obtained by an instationary model. This preconditioning is obtained by applying the tangent application of the stationary multilithologic model to the residue on the thicknesses. At the output, we obtain the accommodation at the end of the sequence considered, as well as the bathymetry and surface composition solutions at any time of the sequences of the instationary model calibrated to the layer thicknesses. Application: location of hydrocarbon reservoirs notably.

A system and method for predicting active, low-frequency sonar array performance in shallow, littoral waters using a physics-based modeling of acoustic reverberation. An operator characterizes the active sonar's acoustic transmitter and receiver, the environment it is operating in and the targets to be detected. The operator selects appropriate bathymetry, bottom composition and sound-speed profile. The spatial resolution of the bathymetry database is enhanced using fractal interpolation and a bottom-loss-and-scattering corrected-for-slope is calculated. A semi-empirical scattering strength is derived from a wind-speed data base and a stochastic biologic realization is derived from a biologic population database. These are then used to calculate a deterministic component of bottom, surface and volume reverberation using a normal mode mathematical model of acoustic wave propagation. A stochastic realization of clutter is calculated using a Generalized Gamma distribution database, and combined with the deterministic components of reverberation.

The invention relates to a method and a system for determining an initial value of an effective signal of an airborne lidar bathymetry received waveform. The method comprises the steps of: obtaining awaveform to be processed, and taking the global maximum value point of the waveform as an initial value tS0 of a water surface echo signal position; and taking the maximum value in a set range near the extreme point of the first derivative of the waveform as the initial value tB0 of the water bottom echo signal position. According to the scheme, the maximum value detection is combined with the finding that the first derivative extreme value is always associated near the effective signal, so that the accuracy of determining the effective signal is improved. Meanwhile, the intensity of atmospheric scattering and water body backscattering is far less than that of water surface reflection, so that a waveform global maximum value point can be considered as an initial value of the water surfaceecho signal position.

The present invention relates to a method for exploitation of a sedimentary basin. Exploitation of the sedimentary basin is permitted by the choice of zones of interest within the basin, the zones being determined by means of maps of total organic carbon TOC and of hydrogen index HI of at least one sedimentary layer. According to the invention, the maps of total organic carbon TOC and of hydrogen index HI are obtained taking into account the current values of TOC_A(W) and HI_A(W) at the level of the well and taking into account the maps of bathymetry BM and of sedimentation rate SM.

The invention relates to an automatic water-quality layering and sampling system which comprises an unmanned ship and a sampling module, wherein the unmanned ship has an autonomous navigation function, and the sampling module is mounted on the unmanned ship. The sampling module comprises a peristaltic pump, a sampling water distributor, a servo reel pipe, a single-beam bathymetry sensor, a water depth pressure sensor, a plurality sampling bottles, a water absorption tube and a PLC (programmable logic controller) control system, the peristaltic pump absorbs sampling water and is connected with the sampling water distributor through the water absorption tube, the sampling water distributor is connected with the sampling bottles, the water depth pressure sensor is mounted is mounted at one end of a winding line on the servo reel pipe and positioned in the front of the unmanned ship, the single-beam bathymetry sensor is mounted at the bottom of the unmanned ship, and the single-beam bathymetry sensor, the water depth pressure sensor, the peristaltic pump and a servo motor of the servo reel pipe is connected with the PLC control system.

A system and method for predicting passive, high-frequency sonar array performance at any underwater location, implemented as a software package running on a computer. An operator selects an arbitrary geographical location, specifies a sonar array and defines a target. The necessary bathymetry, and associated oceanographic, environmental and meteorological data are automatically acquired or generated, along with appropriate models for ocean surface and bottom reflectivity, and vertical noise directionality. A Comprehensive Acoustic System Simulation (CASS) software module performs appropriate ray tracing, which is used to produce Cross-Spectral Density (CSD) matrices for the target and the anisotropic ambient noise. These are used to generate graphic and numeric representations of the array's performance at the selected location. A time of year may also be specified and the appropriate anisotropic noise field for conditions expected at that location at that time of year will be generated. Shipping realizations may be incorporated.

The present disclosure relates to a system (300) for detecting subsurface objects within a confined sea area. The system comprises one or more surface vessels (301) and at least one control unit (302). Each surface vessel (301) comprises positioning means and is arranged to gather bathymetry measurements during controlled motion in a path within the confined sea area and to transmit the bathymetry measurements to the at least one control unit (302). The control unit (302) is arranged to receive bathymetry measurements from the one or more surface vessels (301). Each surface vessel (301) is unmanned and arranged to operate in an autonomous or remotely controlled state when gathering bathymetry measurements. The control unit (302) is arranged to retrieve bathymetry data representing said path from a memory in the control unit. The control unit (302) is further arranged to compare the received bathymetry measurements to the retrieved bathymetry data and to indicate a presence of a subsurface object upon determination of a deviation between received bathymetry measurements and retrieved bathymetry data for at least one geographical position along said path. The disclosure also relates to an unmanned surface vessel adapted to detect subsurface objects.

The present invention discloses a ground geomagnetic data intuitive color block processing method based on a reference equivalent weight. The method is applied in the technical field of ground geomagnetic bathymetry data processing. The method aims to overcome the defects in the existing ground geomagnetic bathymetry data inversion processing. The method can dynamically establish a reference equivalent weight to process the original data, and convert the data into different color blocks to visually display geological information including geological profile, fault structure, mineral location form or stratum information.

The invention discloses a multi-beam underwater terrain combination matching method based on inertial constraints, which belongs to the field of terrain-assisted inertial navigation. The method of the present invention: firstly, based on the bathymetry sequence and the initial position provided by the inertial navigation system, using terrain adaptation parameters and maximum likelihood estimation to achieve fast rough matching; then, introducing inertial constraints and distance weights to reduce mismatched points The influence of , and an accurate numerical solution for calculating the trajectory scaling factor is given. The precision matching is achieved by sequentially scaling, rotating and translating the inertial indicated track; finally, the position sequence obtained by the two-step matching is compared with the inertial track The difference between the indicated position sequences of the navigation system is used as the observation value of the Kalman filter based on the time-delay error correction based on state recursion to correct the attitude, velocity and position of the inertial navigation system and improve the positioning accuracy of the integrated navigation.