42 results about "Radar" patented technology

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.

In order to prevent delays in output of detection results, even when a plurality of frequency modulation methods with different frequency change rates are used, an FM-CW radar device employing frequency modulation with two different frequency change rates, has distance/velocity detection unit for detecting the relative distance or relative velocity of a target object based on beat signals of transmission signals with the same frequency change rate and for detecting the relative distance or relative velocity using beat signals when the frequency change rates are different, and distance/velocity confirmation unit for adding evaluation values for relative distances or relative velocities detected in the detection processing, and for confirming the relative distance or relative velocity based on the evaluation value which has reached a criterion value. As a result, more data can be obtained in one detection cycle, and the same advantageous results as when executing a plurality of detection cycles can be obtained. Consequently, delay of output of detection results from the radar device to a vehicle control device can be prevented.

The invention discloses a device and method for monitoring and early warning of flood damages based on multi-resource integration. The device comprises a hydrological actual state module, a flow forecast module, a weather forecast module, a radar analysis module, a forecast integration module and a module for product display and early warning release. The method comprises the steps that (1) the hydrological actual state module reads and monitors monitoring point data; (2) the weather forecast module reads input data and parameters to carry out weather mode forecasting; (3) the flow forecast module carries out flow forecasting according to the weather mode forecast and the monitoring point data provided by the hydrological actual state module; (4) the radar analysis module reaches basic data of a radar and estimates precipitation and optical-flow extrapolation; (5) the forecast integration module integrates and outputs information of the flow forecast module and the radar analysis module; and (6) the module for the production display and the early warning release completes the product display and the early warning release. The device and the method consider accuracy of radar extrapolation forecasting in forecasting of the position of a precipitation system and also consider capacity of numerical mode forecasting, so that limitations of the single method are avoided.

The invention relates to a safe door opener for an automobile, which is arranged on a draw bar connected with a spring bolt in an automobile door, and comprises an expansion link, a lock case and an elastic mechanism, wherein the expansion link is divided into two independent sections, one section is fixedly connected with the expansion link, and the other section is fixedly connected with the lock case; the elastic mechanism is used for controlling the expansion link or the lock case to return; the lock case is internally provided with a controllably rotary or expansible ejector rob; the middle of the expansion link is provided with grooves; and a ball is arranged between the grooves. In the safe door opener for the automobile, the controllably rotary or expansible ejector rob is used and combined with a radar monitoring probe and a control circuit which are arranged on the automobile, so that a worker opening the door is timely reminded of stopping opening the door so as to avoid collision when the automobile travels at I-gear, and the action of opening the door is invalid at the same time. When the automobile runs, the door can be controlled automatically so as not to be opened if only the circuit is not cut off, thus avoiding accidents.

A computer system for processing synthetic aperture radar (SAR) images includes a database for storing SAR images to be processed, and a processor for processing a SAR image from the database. The processing includes determining noise in a SAR image to be processed, selecting a noise threshold for the SAR image based on the determined noise, and mathematically adjusting an anisotropic diffusion algorithm based on the selected noise threshold. The adjusted anisotropic diffusion algorithm is applied to the SAR image.

The invention discloses an ad hoc network induction lamp for highway low visibility rainy and foggy weather safety induction. The ad hoc network induction lamp comprises an induction lamp shell, wherein a low power mainboard is fixed in the induction lamp shell; an intelligent ad hoc network zigbee communication module is connected with the low power mainboard through utilization of a rapid pull plug; a round red and yellow high brightness lamp panel is connected with the low power mainboard through utilization of a Dubond thread and is fixed on the induction lamp shell through utilization ofa transparent outer cover; a rain and fog high penetrability vehicle detection radar is mounted on a side face of the induction lamp shell and is connected with the rapid pull plug of the low power mainboard through utilization of the Dubond thread; a high precision time service GPS module is directly welded on the low power mainboard; a software self-management power module is fixed at a bottom of the induction lamp shell and is connected with the low power mainboard through utilization of a power wire; and a high performance monocrystalline silicon solar panel is mounted at a top of the induction lamp shell. The ad hoc network induction lamp is applicable to intelligent induction of driving under highway low visibility rainy and foggy weather condition, vehicle driving safety is ensured,and the ad hoc network induction lamp is important manifestation for establishment of an intelligent transportation system.

The invention discloses a self-mixing coherent laser radar invasive blood sugar measuring system, which comprises a tunable semiconductor laser, a photodetector, a signal processing circuit and the like. The photodetector is arranged on the rear end face of the laser or arranged in parallel with the laser; and the signal processing circuit is connected with the photodetector. The mode-hopping-free tunable semiconductor laser replaces a movable mechanical arm, the mechanical precision requirement of the system is reduced, and the system is miniaturized and portable; and the system is further simplified by a self-mixing coherent method, signals are amplified, and weak signals can be detected through simple elements and structures.

The invention is a processing method for an m-sequential code pulse modulation ultra wide band radar echo, relating to m-sequential code ultra wide band radar technology, comprising a signal emission scheme which combines an m-sequential code ultra-wide-band radar and a post-processing method; and an m-sequential code ultra wide band radar echo processing method. The method of the invention can effectively improve the problem that a side lobe is relatively high after m-sequential code signal pulse compression, effectively introduce Fast Hadamard Transformation at the same time, and raise an echo processing speed.

The embodiment of the invention relates to the technical field of unmanned aerial vehicles, and particularly discloses a method and device for adjusting the main detection direction of an airborne radar and an unmanned aerial vehicle. The unmanned aerial vehicle comprises a holder and the airborne radar arranged on the holder, and the method comprises the steps: acquiring the flight information ofthe unmanned aerial vehicle in real time, wherein the flight information comprises at least one of the current pitch angle and the flight height of the unmanned aerial vehicle; and adjusting the maindetection direction of the airborne radar through the holder according to the flight information, so that the airborne radar can detect obstacles in the flight direction of the unmanned aerial vehicle. According to the technical scheme, the effective detection effect of the airborne radar in the obstacle avoidance system can be improved, and the obstacle avoidance function can be completed more safely.

The present invention provides a radar antenna protection channel generation method. The method comprises the following steps: Step 1: determining an initialization parameter (wherein the protection channel parameter matrix is an NxM-dimensional matrix equal to the dimension of the antenna array element), and setting the initial value of the parameter matrix; Step 2: determining the objective optimization function according to the characteristics of the radar antenna protection channel; Step 3: using the pattern search algorithm to perform single optimization through the objective optimizationfunction; Step 4: repeating the step 3 operation for M times to obtain a set of M times optimization results; and Step 5: in the set of M times optimization results, finding out an optimization result that can minimize the objective optimization function to generate an antenna protection channel. The protection channel generation parameters obtained by using the method provided by the present invention have correctness, effectiveness and reliability; and the protection channel generated according to the parameters can effectively suppress the side antenna interference and various strong clutter echoes.

The invention relates to a planar coriolis millimeter wave, a terahertz power amplifier and a preparation method thereof, which sequentially comprises a substrate, a channel layer and a coplanar waveguide electrode from bottom to top. The carrier concentration of the channel layer is 1*1014 -1*1017 cm<3>. The length of the channel layer is 1-10 microns. The value range of the product N of the carrier concentration of the channel layer and the length of the channel layer is 1*1011 cm<2> < N < 1*1014 cm <2>. Accoridng to the invention, a coriolis power amplifier with a plane structure is designed, and the device has an obvious negative differential resistance effect. The power amplification from the microwave to the terahertz frequency can be realized. The invetion is beneficial to the application of a planar coriolis device as a microwave or terahertz amplifier in the fields of microwave and terahertz communication, radars, imaging and the like.

The invention discloses a multi-rotor aircraft with an electric wire supplying power and application of the multi-rotor aircraft, belongs to the technical field of aviation, and particularly relates to a combined-type aircraft. The combined-type aircraft comprises a fixed wing aircraft, the multi-rotor aircraft and a ground power supply device; the structure of the fixed wing aircraft is similar to that of a regular fixed wing aircraft, and the fixed wing aircraft is further provided with a connecting end; the multi-rotor aircraft comprises a machine body, a connecting device, a radar detecting device and a power supply distributor; the ground power supply device comprises a controller, an electric wire collecting and putting implement and the electric wire; one end of the electric wire is fixedly connected to the power supply distributor, the other end of the electric wire is connected to a power source and is twined on the electric wire collecting and putting implement, and the electric wire transmits power supply for the multi-rotor aircraft; the multi-rotor aircraft flies in the sky with the electric wire, and the connecting device joints the connecting end so as to make the multi-rotor aircraft and the fixed wing aircraft connected and combined to load or carry the fixed wing aircraft. According to the multi-rotor aircraft with the electric wire supplying power and the application of the multi-rotor aircraft, the power source is provided for the multi-rotor aircraft through the electric wire, the combination of the multi-rotor aircraft and the fixed wing aircraft is utilized, and a new scheme is provided for the taking off and landing of the fixed wing aircraft.

The invention discloses an adaptive compensation device for horizontal imaging field pitch angle of laser radar. The adaptive compensation device comprises: a metal frame; a turntable fixed to the metal frame; a spindle having one end fixed to the turntable through a fixing point and configured to be capable of rotating around the fixing point, wherein the upper portion of the other end of the spindle is configured to hold a laser, and the spindle is used for rotating to adjust imaging field pitch angle of the laser; a thermal expansion rod having the upper end fixed to the metal frame and thelower end abutted to the spindle, wherein a thermal expansion coefficient of the thermal expansion rod is greater than that of the metal frame; a spring having two ends fixed between the lower portion of the other end of the spindle and the metal frame. The metal frame and the thermal expansion rod have a great thermal expansion coefficient difference; upon a temperature change, deformation of the thermal expansion rod may push the spindle so as to drive a laser beam emitted by the laser on the spindle to rotate opposite to a displacement of the pitch angle, and thermo-optic drift due to temperature gradient is adaptively compensated.

[Problem] To provide an image processing apparatus for generating an image that allows an object of interest to be distinguished from other objects. [Solution] An image processing unit (15) calculates, with respect to echo signals read from a sweep memory (14), the percentage of ones, which exhibit a predetermined level or higher levels, of a predetermined sample number or less number of echo signals, and generates image data having display elements in accordance with the calculated percentage. This percentage will be small if the object of interest is an isolated object, such as a ship or the like, while the percentage will be large if the object of interest is an object existing as a large mass like an inland. The image processing unit (15) acquires color values (R, G, B values) in accordance with the calculated percentage. An object of interest that is a ship or the like is an isolated object and hence would have a color value of red because of a small percentage, while an inland is an object existing as a large mass and hence would have a color value of green because of a large percentage.

The invention discloses a dual-frequency feed source feed-based low-focal-diameter-ratio reflector antenna with a sub-reflector, belongs to the technical field of radar technology and wireless communication, and particularly relates to a dual-frequency feed source feed-based low-focal-diameter-ratio reflector antenna with a sub-reflector, which is applicable to radars and communication systems ofmicrowaves, millimeter waves and the like. The antenna comprises a dual-frequency feed source capable of simultaneously working in Ku and E wavebands, a reflecting surface, a fixed medium for supporting and separating inner and outer waveguides, a high-frequency sub-surface medium, low-frequency sub-surface supporting metal, and a low-frequency sub-surface reflecting array printed with metal patches. The low-frequency phase shift is adjusted by the metal patches of the low-frequency sub-surface reflection array, so that equal phase on the ring focus of the reflection surface is realized. The antenna can work in dual bands of Ku and E bands, effectively solves the dual-band and low-profile problems of the reflector antenna, and can be used for a dual-band low-profile communication system needing high gain.

The invention relates to the field of radar target detection, and provides a distributed radar target detection method and device based on a dynamic multi-scale grid. The method comprises the following steps: firstly, dividing a three-dimensional detection space by using a cuboid grid of which the size is far greater than the radar distance resolution, establishing an index between a large-size grid and each channel echo signal distance unit, and traversing a grid region to complete first target detection; and then iterative detection is carried out, that is, the detection range is continuously reduced according to the position of the existing target and the neighborhood range thereof obtained by last target detection, grids with smaller sizes are divided in real time in the reduced detection range, indexes of the grids with the smaller sizes and echo signal distance units of all channels are established, grid detection is carried out, and the detection accuracy is improved. According to the invention, the detection precision is ensured, the detection efficiency is effectively improved, the dynamic construction of the grid region and the index relationship is realized, and the occupation of the storage grid and the index relationship on memory resources is effectively reduced.

The invention relates to a photoelectric collaborative processing system for panoramic imaging of a high-resolution synthetic aperture radar signal. The system comprises a light source module, a plurality of parallel sub data processing unit, a summation module, and a collection module. The light source module is used for generating a plurality of beams of same parallel laser beams as inputs of the sub data processing units. Each sub data processing unit includes a data modulation module, an imaging module, an interpolation operation module and a phase shift operation module to realize modulation of the SAR sub data block, generation of a low-resolution image, sinc interpolation operation and outputting after frequency spectrum shifting. The summation module is used for carrying out summation operation on beams outputted by all sub data processing units to obtain a high-resolution panoramic SAR image. The collection module is used for collecting and displaying the SAR image. Compared with the prior art, the system has advantages of parallel processing, real-time imaging, high flexibility, and the like.

The invention provides a beamforming method of a communication radar integrated secrecy system. A communication radar integrated DFRC device, a legal receiver and a detection target serving as an eavesdropping party are received in the system implemented by the beamforming method. The DFRC equipment sends information to a receiver and receives radar echo data, and the step of obtaining the data related to the detection target from the radar echo data comprises the following steps: obtaining the data related to the receiver, local parameters of the DFRC device and data related to a detection target and a receiver are used as input parameters to carry out calculation of an optimal transmitting beam in beam forming, and the maximum safety rate of the system is obtained at the same time. According to the method, a physical layer security technology is adopted, information is prevented from being leaked to a malicious target when communication with a receiver is carried out, the optimal transmitting beam of the DFRC equipment is designed on the premise that the target estimation rate is guaranteed, and the system security rate is maximized on the premise that the target estimation rate is guaranteed.

The invention belongs to the technical field of radar antenna design, and particularly relates to a rotation sparse arraying method of a distributed architecture antenna system. The method comprises the following steps: S1, determining an antenna emission work duty ratio of a distributed architecture antenna; s2, determining the number of gating channels working at the same time of each array plane subunit according to the antenna emission working duty ratio; s3, for each array plane subunit, constructing a plurality of groups of rotation schemes according to the number of gating channels and the total number of transmitting and receiving channels; and S4, determining each gating channel of each group of rotation schemes of each array plane subunit. According to the method, the emission working mode is designed through emission channel sparse gating, full-array channel rotation and array optimization, good emission beam characteristics are achieved, meanwhile, power supply balance and heat dissipation balance of a distributed architecture antenna system are achieved, and the requirement of a radar for the long-time and stable emission working state of the antenna system is met.