58results about "Electromagnetic wave reradiation" patented technology

A system enables indirect determination of a position vector (V_R) of a point position (P). The system uses two fixed trackers (10 and 10′) whose absolute positions are known. A movable measuring device (20) provides a rigid rod (25) supporting a pair of reflectors (30 and 30′) which are mounted at fixed positions. A reference point (R) is mounted at a further fixed position on the rod (25) and is on a straight line (L) through the reflectors (30 and 30′). Light beams from the trackers (10 and 10′) acquire the reflectors (30 and 30′) so that when the reference point (R) is positioned at the point position (P), the position vector (V_R) of point position (P) is determinate by vector addition.

The invention discloses an obstacle feature extraction method based on a millimeter wave radar and a laser radar. The method includes the following steps that: step 1, radar raw data are acquired; step 2, the radar original data are solved according to a radar protocol, so that obstacle position information can be obtained; step 3, the solved millimeter wave radar data are screened; step 4, time and space synchronization is performed on the millimeter wave radar and the laser radar; step 5, regions of interest (ROI) are established in a laser radar coordinate system according to millimeter wave radar information and are denoted as Ri, wherein i is equal to 1, 2, ... n, wherein n is the number of the effective targets of the millimeter wave radar; step 6, the point cloud data of the i-th ROI are processed according to a scattered point cloud data simplification processing method; and step 7, a two-dimensional image is generated on the basis of the point cloud data, edge detection is performed on the image, and obstacle features are extracted. With the method adopted, obstacle edge information can be obtained, and therefore, more references can be provided for a driverless decision-making layer.

This invention discloses a method to accurately locate book in library, which comprises the following steps: determining library book information step and determining library position information, wherein, the library book information adopts RFID technique for sensing read and the position information uses infrared sensor. This invention also discloses one system to located library, which comprises electron label, RFID reader, infrared sensor, record generation unit, buffer memory, coding module and decoding module and database.

A procedure for calibrating a vehicle onboard sensor 202 by facilitating the placement of a calibration fixture 110 on a floor relative to a stationary vehicle 100 using a laser emitter 102 secured to a front steerable wheel 104 of the vehicle on the same lateral side as the vehicle onboard sensor. A beam projection axis X of the laser projector is aligned at a known orientation relative to a geometric characteristic of the vehicle 100, such that the beam projection axis X is directed over a placement location P of the calibration fixture on the floor, either inherently or by guided steering of the supporting steerable wheel. A distance between the calibration fixture 110 and a reference point associated with the vehicle 100 is measured, and a current position of the calibration fixture on the floor along the beam projection axis X is adjusted as required to position the calibration fixture for calibration of the vehicle sensor 202 at a selected distance from the reference point along the beam projection axis X,

Methods and systems are provided for characterizing an overhead line. A radar signal is propagated in a region that includes at least a portion of the overhead line and a reference object, which may, for example, be a ground surface, growth over a ground surface, or another overhead line. A reflected radar signal is received from the overhead line and the reference object. A determination is made of a geometric relationship between the overhead line and the reference object, such as by determining a minimal separation between the overhead line and the reference object.

The invention relates to a method for extracting land utilization landmark boundary outline on a remote sensing image. The method comprises the following steps of: registering the remote sensing image with GIS (Geographic Information System) data, and establishing a corresponding relationship between outline nodes and a grid by taking a land utilization object boundary in GIS as an initial value for extracting the land utilization landmark boundary outline on the image; making a statistics on region information of the image in the grid, and obtaining a light spectrum gray level information statistic in the grid; establishing a grid energy minimization function, and importing obtained attribute into the grid energy function; moving any mode, counting whether the total grid energy can be reduced by position change of local nodes, changing the positions of the nodes if the total grid energy can be reduced by the position change of the local nodes, or keeping the positions of the nodes unchanged; and checking a distance between every two nodes, inserting a new node between the nodes which meets certain conditions, carrying out multistage evolution on the outline, and returning to the last step for continuous cycling before the cycle reaches certain conditions. The method disclosed by the invention realizes integrally optimal land utilization boundary characteristic extraction of the high-resolution remote sensing image on the basis of a dynamic outline method of minimum grid energy under the guidance of GIS data.

The invention provides a speed measurement method for measuring the speed by the adoption of two cameras. The method comprises the steps that the first camera and the second camera are adopted for capturing images of a moving object to be measured; according to a point to be measured on the object to be measured, the azimuth angle of inclined light, incoming to the first camera, of the point to be measured on the object to be measured and the azimuth angle of inclined light, incoming to the second camera, of the point to be measured on the object are obtained according to the positions of the images, generated in the first camera and the second camera, of the object to be measured, and position coordinates, on different measurement points of a movement track of the point to be measured, of the point to be measured on the object to be measured are obtained; according to the position coordinates, on different measurement points of a movement track of the point to be measured, of the point to be measured on the object to be measured, the sum of the distance between adjacent measurement points of the point to be measured of the object to be measured is obtained, and the movement speed of the object to be measured is obtained according to measurement time. The invention further correspondingly provides a speed measurement device and a terminal. According to the speed measurement method and device and the terminal, the movement speed of the object, to be measured, in curvilinear movement can be measured by the adoption of the cameras.

The invention relates to a cloud point filtering method and device, computer equipment and a storage medium. The method comprises that cloud point data is obtained; the cloud point data includes a setof data points obtained from the road scanning environment; a neighborhood of a present data point in the point cloud data is determined; when the counted first number of data points in the neighborhood of the present data point is lower than a preset threshold, the present data point is determined to be a candidate noise point; the candidate noise point as a seed point carries out regional growth to obtain a target growth region; when the counted second number of data points in the target growth region is lower than a preset threshold, the candidate noise point as a noise point is filtered from the point cloud data. The noise point is located preliminarily, and then determined by regional growth and filtered, data points formed by objects in the far place and sparse data points in the point cloud data are protected, and the accuracy of point cloud filtering is improved.

Method for improving the quality of a set of a three dimensional (3D) point cloud data representing a physical surface by detecting and filling null spaces (606). The method includes analyzing (206) the data to identify the presence of a plurality of level 1 fractals (401), each defined by a plurality of voxels (400) containing data points arranged in one of a plurality of three-dimensional patterns. The method also includes selectively filling (212) voxels in the 3D point cloud data with a first predetermined limited number of data points to increase a number of instances where level 2 fractals (604) can be used for representing the 3D point cloud data. Each level 2 fractal is defined as a common plurality of the level 1 fractals having a common three-dimensional pattern, where the common plurality of level 1 fractals are also arranged in accordance with the common three dimensional pattern.

The amplitude modulation wave phase-locked laser ranging method and device belong to the laser ranging technology; the present invention uses an amplitude modulated light wave phase-locked amplifier at the target end of the active phase ranging device; the measuring end of the ranging system sends a beam of light intensity through Sinusoidally modulated beam, the target end of the ranging system performs phase-locked amplification on the received amplitude modulated optical signal from the measurement end, generates a laser signal with the same modulation frequency as the laser signal from the measurement end and has a constant difference, and sends it back to the measurement end. The measurement terminal realizes the distance measurement by detecting the phase difference between the sending and receiving signals and combining the constant phase difference; it has the characteristics of high ranging accuracy.

A radar sensor and a corresponding method for distance and cruise control of a vehicle are described; using this sensor and method, objects in front of the vehicle in the direction of travel are detected and at least the variables: distance, relative velocity, and azimuth angle of the detected objects are ascertained with regard to the vehicle, the change over time of the reflection point of the radar beam on the object and classification of the detected object being determined as a function of the change over time of the reflection point.

This invention provides a mobile positioning method and system, which comprises the following steps: first determining an initial points three-dimensional information of a mobile body, wherein the three-dimensional information is based on a resolute earth coordinate system; then detecting the said mobile body three-dimensional movement and generating the movement information; finally converting the information into the resolute coordinates system information.

A method for measuring the mean velocity (V_H) of an extracorporeal blood fluid or infusion fluid, by means of retroinjection interferometry, comprises the step of emitting a first laser light beam (41), from the laser cavity (40) of a semiconductor laser source (60), reflection of a second laser beam (45) by the fluid (50) and consequent generation of interference with the first laser beam (41) inside the laser cavity (40), detection of the interference signal by a monitoring photodiode (46), and processing, by means of an electronic processing and control circuit (100), of the interference signal detected. The invention also comprises an apparatus (62) for implementing the method described and an extracorporeal circuit (58) comprising said apparatus. The invention also comprises a method for replacing a laser source in said apparatus.

The invention discloses a solid-state multi-line ranging device, which comprises a emitted light module, a ranging module, an image sensor and a spectroscope, wherein the emitted light module emits infrared detection light, the infrared detection light emits into the environment and is reflected when encountering a measured object; the infrared detection light and environment visible light reflected by the measured object incident on the spectroscope, and the spectroscope separates the infrared detection light from the environment visible light; the ranging module receives the infrared detection light which passes through or is reflected by the spectroscope, and obtains a distance between the ranging device and the measured object based on a time of flight method, and/or the ranging device obtains intensity of the received infrared detection light; and the image sensor receives the environment visible light which is reflected by or passes through the spectroscope, and obtains image color information of the measured object. The solid-state multi-line ranging device does not have a mechanical rotating device, is more stable, and has longer service life.

A stable optical reference oscillator (SORO) consisting of conventional low power CW source of coherent optical radiation having a relatively narrow bandwidth is mixed, i.e., beat against a sample of an incoherent laser transmit signal and the phase of the resultant signal is recorded. This is then compared to the phase of an ideal pulse of a perfect laser transmitter which was previously generated and recorded. The result is a phase correction term which is used in the subsequent signal processing of the received signals to realign the received laser pulses so that they are phase coherent.

Provided is an information processing device including an acquisition unit that acquires a first captured image, a second captured image, and a distance to a subject, and a derivation unit that derives an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates for specifying a plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light beam on the real space and correspond to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, emission position coordinates which are derived on the basis of the distance acquired by the acquisition unit, a focal length of an imaging lens, and dimensions of imaging pixels.

Method for determining the position coordinates (X_M, YM, ZM) of a target object (11) in a measurement range (12) in at least two dimensions (X, Y, Z), with the steps: a target device (13) with a reflector element (31) is positioned at the target object (11), a laser beam (46) is transmitted from a transmitting element (41) of a laser distance measurement device (14) onto the target device (13), at least a part of the laser beam (46) is partially reflected on the reflector element (31), a camera device (15) records an image of the target device (13) with the at least partially reflected laser beam as a light reflection, the focus of the light reflection in the image of the target device (13) is determined, a receiver element in the laser distance measuring device (14) receives the laser beam partially reflected on the reflector element (31) as the received beam, a distance to the target object (11) is calculated from the received beam, a first offset is calculated from a focal length of the camera device (15), the calculated distance to the target object (11) and a first image coordinate of the focus of the light reflection, the position coordinates (XM, YM, ZM) of the target object (11) are calculated from the distance and the first offset.

The invention provides a laser radar transmitting system, and belongs to the technical field of laser radar systems. The laser radar transmitting system comprises a laser light source, a collimating optical device arranged on an emergent light path of the laser light source and used for forming a collimating light beam, an adjustable support used for fixedly installing the laser light source and the collimating optical device, a fixed support fixed on a laser radar shell and used for installing the adjustable support, and adjusting components used for adjusting a swing position of the adjustable support relative to the fixed support, wherein the adjustable support can swing in a direction perpendicular to the light path of the collimating light beam relative to the fixed support. Accordingto the laser radar transmitting system provided by the invention, the structural deviation caused by processing, assembly and device errors can be counteracted by adjusting an emission angle of the laser radar, the requirements of the system for the processing and assembly errors are met, and the measurement precision of the laser radar is effectively improved.

The invention discloses a helicopter optical atmospheric data system, and aims to provide an atmospheric data system which is strong in anti-interference performance, high in precision and reliabilityand high in comprehensive detection resolving capability. The method is realized through the following technical scheme: based on a laser Doppler wind-finding radar detection principle, a sensor assembly emits laser to a sensed assembly. The sensor assembly emits laser to the atmosphere through multiple lenses. A scattering laser signal carrying optical axis airspeed information after interactionwith the atmosphere is received at the same time, the scattering laser signal is sent back to the sensor assembly to be processed, the sensor assembly calculates the optical axis airspeed and furtherobtains airspeed information of the helicopter, and the airspeed information comprises three-dimensional airspeed, an attack angle and a sideslip angle; meanwhile, the static pressure sensor measuresto obtain an atmospheric static pressure signal, and the static temperature sensor measures to obtain an atmospheric static temperature signal; and the sensor assembly performs data fusion on the obtained airspeed information, atmospheric static pressure information and atmospheric static temperature information, and directly calculates and outputs a complete helicopter three-axis atmospheric data signal.

The invention relates to a laser guidance anti-jamming processing method. A RAM-based pulse correlation processing method is used. Parallel more than 3 6-point pulse indexing and matching algorithms are used inside an FPGA. Even when interference pulse reaches 300 KHz, a correct target reflection pulse train is matched. The time used is controlled within 1 pulse interval, and the correct reflection pulse train can be locked within about 60ms*(6+1)=420ms when a seeker is turned on. Good anti-laser high repetition rate and random interference are realized, and a target is fast hit in a laser interference environment.

The invention belongs to the technical field of laser ranging, and particularly relates to a delay value real-time validation system, method and device of a laser ranging system. The system includes: a laser, an optical pulse beam expanding system, a main wave sampling circuit, a broken axis optical path group, a guide optical path group, an optical reverse reflection device, a photoelectric detector, a time interval counter, a transmitting telescope, a receiving telescope and a clock. The real-time performance and accuracy of the delay valiation of the system are improved, and the delay value real-time validation system, method and device have the very important significance for improving the quality of the observed data and improving the accuracy of the observed data.

The invention provides a data synchronization method, device and system. A processing chip is used for receiving a scanning position indication signal sent by a laser radar, determining detection azimuth information of the laser radar according to the scanning position indication signal, and sending a first control signal to an image acquisition device according to the detection azimuth information, the first control signal being used for controlling the image acquisition device to complete exposure when the laser radar scans to the overlap area, so that a video image output by the image acquisition device is synchronized with detection data output by the laser radar. According to the technical scheme of the invention, the laser radar and the image acquisition device can obtain the data ofthe target view field at the same time, and the laser radar and the image acquisition device can synchronously obtain the data.

The invention provides a photomask dirt detection system for a laser radar. The system comprises a transmitting device which is disposed on an optical machine rotor of the laser radar, is configured to transmit a detection light beam with a wavelength different from the wavelength of a light beam, emitted by the laser radar, for a detection target, and is used for detecting dirt on a photomask, areceiving device which is arranged on an optical machine rotor of the laser radar, and is configured to receive echoes generated after the detection light beam emitted by the transmitting device is reflected by dirt on the photomask and convert the echoes into a detection electric signal, and a processing unit which is coupled with the receiving device and is configured to identify the dirt condition of the photomask according to the detection electric signal. Through the embodiment of the invention, optical crosstalk can be effectively avoided when the photomask dirt is detected, meanwhile, 360-degree detection of the photomask can be realized, the detection range of the photomask dirt is enlarged, identification of different kinds of dirt is realized, and the detection efficiency is improved.

A surveying instrument comprises a projection optical system for irradiating a distance measuring light which is a linearly-polarized light to an object to be measured, a light receiving optical system for receiving a reflected distance measuring light from the object to be measured, a polarization selecting module for selecting a polarization of the reflected distance measuring light received by the light receiving optical system and an arithmetic control module for controlling a distance measurement based on a light receiving result of the reflected distance measuring light, wherein the arithmetic control module is configured to give a material information to a distance measurement result of the object to be measured based on a change in light receiving amounts caused due to a selection of the polarization by the polarization selecting module.

The invention relates to the technical field of distance measurement, aims at solving the problems that most of existing laser ranging devices are inconvenient to accurately guarantee that the measuring surfaces of the laser ranging devices are parallel to a plane needing to be measured, and measurement is inconvenient under some conditions, and provides an angle-adjustable laser ranging device and laser ranging method. The angle-adjustable laser ranging device comprises a rotating module, a laser ranging module and a control system, the laser ranging module is fixedly connected with the rotating part of the rotating module, and the laser ranging module and the rotating module are both electrically connected with the control system. The control system can receive and process the distance value measured by the laser ranging module, and controls the rotating module to drive the laser ranging module to rotate according to the distance value. The laser ranging device has the beneficial effects that the ranging reference surface of the laser ranging module can be automatically controlled to be parallel to a plane to be measured, the structure is simple, adjustment is convenient, and the use convenience is greatly improved.