55 results about "Ground based radar" patented technology

The invention discloses a rapid detection method for a tunnel to pass through a large karst cave, and relates to the technical field of civil engineering, and the method comprises the following steps: S1, selecting a detection position and drilling a drill hole; s2, installing a drilling radar; s3, setting a ground radar; s4, starting radar data acquisition; s5, performing data processing and analysis to generate a tomography image; s6, karst cave identification and analysis; s7, safety measures and construction schemes are formulated; and S8, dynamically adjusting the detection parameters. According to the invention, through combined use of the drilling radar and the ground radar and combination of advanced data processing technologies and algorithms, a high-precision tomography image can be generated, the position, the shape, the size and the filling condition of the karst cave can be accurately identified, reliable geological information is provided for construction, and potential safety hazards in the construction process are effectively avoided.

The invention discloses a multi-unmanned-vehicle autonomous exploration method and system for a real large-scale complex scene, and the method comprises the steps: carrying out the voxelization of a three-dimensional environment, and carrying out the detection of a leading edge point; constructing an initialized undirected passable topological graph for sharing of multiple vehicles and calculation of path distances from the multiple vehicles to a target point; obtaining the pose of the radar relative to the world coordinate system and the pose of the robot relative to the world coordinate system by using observation data of the radar and the IMU; ground radar data extracted through ground segmentation is combined with obstacle point cloud data to guarantee that the robot operates in a complex environment. A brand-new distributed task allocation method for multiple unmanned vehicles is provided, and the dispersion rate and the exploration efficiency between robots are considered; and obtaining a reachable path from the robot to the target point based on the cost function distribution. The problem that in the field of multi-unmanned-vehicle exploration, multi-unmanned-vehicle exploration based on 3D laser radar is mostly applied to a simulation environment and is difficult to deploy to a mobile robot to explore a real environment is solved.

The invention relates to the technical field of deep foundation pit monitoring, and discloses a deep foundation pit micro-deformation InSAR remote sensing method and system and a storage medium. The method comprises the following steps: synchronously acquiring data through a ground radar and an InSAR satellite, and obtaining a point target set and an original scattering characteristic sequence; obtaining a net deformation phase sequence without influence through registration residual correction, phase deduction and weighted fusion processing, and carrying out phase consistency quality control and unwrapping processing to obtain an accumulated deformation quantity sequence; constructing a deformation mechanism correlation characteristic matrix based on correlation analysis of the cumulative deformation quantity sequence and radar reflection intensity amplitude attenuation characteristics; and fusing the deformation mechanism correlation feature matrix and the real-time differential interference image group, extracting deformation rate and phase gradient change, and further generating a deep foundation pit local micro-deformation risk early warning index set. According to the invention, the tiny deformation of the surrounding area of the foundation pit can be effectively detected, potential risks are warned in advance, and the safety and monitoring efficiency in the construction process are improved.

The invention relates to a cruise low-altitude penetration task route planning method based on an improved A * algorithm, and belongs to the field of route planning of unmanned aerial vehicles. The method comprises the steps of firstly planning and generating a track result for avoiding enemy ground radar threats in a battlefield environment through an improved A * algorithm; secondly, on the basis of the two-dimensional flight path planning result, height planning meeting the performance constraint of the fixed-wing unmanned aerial vehicle is achieved through a particle sedimentation method; and finally obtaining a three-dimensional air route of the fixed-wing unmanned aerial vehicle for completing the established combat task. According to the method, off-line and on-line planning of the reference flight path in a combat mission scene of the fixed-wing unmanned aerial vehicle is realized, the planning time before launching is shortened, the airborne flight path calculation efficiency is improved, the reaction time is shortened, and thus the adaptive capacity of the fixed-wing unmanned aerial vehicle to a complex battlefield environment is improved.

The invention discloses a novel non-line-of-sight target detection method and system. The non-line-of-sight target detection method comprises the steps that a ground radar transmits a signal to an airborne relay system; the relay system receives and amplifies a transmitting signal of the radar, and forwards the enhanced transmitting signal to a to-be-detected target; the to-be-detected target receives the enhanced emission signal and generates an echo signal; the relay system receives and amplifies the target echo signal, and forwards the enhanced echo signal to the ground radar; and the ground radar processes the received enhanced target echo signal so as to realize non-line-of-sight target detection. The non-line-of-sight target detection system comprises a ground radar, an airborne relay system and a to-be-detected target. According to the invention, the airborne relay system is used for enhancing radar emission signals and target scattering echo signals, the radar detection range is expanded, and non-line-of-sight targets shielded by high-rise buildings in the urban environment can be detected.

The invention relates to an unmanned aerial vehicle control method considering weather risks, and the method comprises the steps: collecting the flight environment data of an unmanned aerial vehicle in real time, synchronously receiving a cloud evolution map and a wind shear early warning signal of a ground radar, and carrying out the processing, thereby obtaining multi-mode meteorological data; predicting storm intensity distribution in the track area in 2-5 minutes in the future, and generating a three-dimensional threat level grid map; aiming at the conventional meteorological risk, constructing a threat level-evasion strategy mapping table, judging the threat level, calling a corresponding evasion strategy, and guiding the unmanned aerial vehicle to execute a corresponding evasion action; when encountering an extreme condition, activating an anti-interference navigation mode, enhancing flight stability through rotating speed-pitch angle cooperative control, and triggering a standby landing emergency protocol; after the avoidance action is completed, the flight path is re-planned in combination with space-time constraints, and the flight speed is reasonably adjusted. The invention also relates to an unmanned aerial vehicle control system considering the weather risk. According to the invention, the flight safety and stability of the unmanned aerial vehicle under complex weather conditions can be improved.

The present application relates to a kind of unmanned aerial vehicle control method considering weather risk, including the following steps: real-time acquisition unmanned aerial vehicle flight environment data, synchronous receipt cloud layer evolution map and ground radar's wind shear early warning signal, process to obtain multimodal meteorological data;Predict the storm intensity distribution in future 2-5 minutes track area, and generate three-dimensional threat level grid map;For conventional meteorological risk, build threat level-avoidance strategy mapping table, judge threat level, and call corresponding avoidance strategy, guide unmanned aerial vehicle to execute corresponding avoidance action;When encountering extreme situation, activate anti-interference navigation mode, enhance flight stability by rotating speed-pitch angle collaborative control, trigger emergency protocol of alternate landing;After completing avoidance action, re-plan flight path in combination with space-time constraint, reasonably adjust flight speed.The present application also relates to a kind of unmanned aerial vehicle control system considering weather risk.The present application can improve the flight safety and stability of unmanned aerial vehicle under complex weather conditions.

The invention discloses a lifting mechanism of a ground radar antenna and a working method thereof, and relates to the technical field of radar antennae, the lifting mechanism comprises a first driving mechanism, a turnover arm and a second driving mechanism; one end of the radar antenna is hinged to an antenna pedestal, and the antenna pedestal is fixedly connected to a working platform of a carrier vehicle; the first driving mechanism and the second driving mechanism are linear reciprocating motion mechanisms, one end of the first driving mechanism is hinged to a radar antenna, the other end of the first driving mechanism is hinged to one end of the overturning arm and one end of the second driving mechanism, the other end of the overturning arm is hinged to the radar antenna, and the radar antenna is hinged to the overturning arm. And the other end of the second driving mechanism is hinged with the antenna pedestal. The device has the advantages that the lifting angle of the radar antenna is increased by adopting the lifting mechanism combining the first driving mechanism and the second driving mechanism, so that the ground radar antenna can be simply and quickly subjected to darkroom testing.

The invention discloses a double-frequency broadband large-angular-domain high-gain antenna based on a cavity structure. The antenna mainly solves the problems that an existing antenna cannot meet the requirements of wide frequency band, high gain of a large angular domain near an end-fire direction and conformal installation at the same time. The antenna comprises a radome (1), a metal cavity (2), three sealing rings (3, 7 and 8), two radiators (4 and 5) and a connector (6), the radome comprises a radome front end, a radome flange and an air conditioning cavity from top to bottom, and the influence of the size non-uniformity of the radome on the antenna performance can be eliminated by changing the shape and size of the air conditioning cavity; the two radiators are located in the metal cavity and jointly adjust the angular domain range of the antenna; the first sealing ring (3) is positioned between the antenna housing and the metal cavity; second and third sealing rings (7, 8) are located between the metal cavity and the connector. The antenna has the advantages of being wide in frequency band, high in large angular domain gain near the end-fire direction and easy to conform, is high in water-pressure-resistant sealing performance, and is suitable for ground radar equipment and submarine radar equipment.

The invention belongs to the technical field of antennas and microwaves, and discloses an antenna housing integrated array antenna unit and system. The antenna unit comprises a main shell, a parasitic patch layer, an auxiliary shell, a main patch layer, a printed board feed layer, a reflection bottom plate, a radio frequency coaxial connector and screws. According to the antenna unit, broadband wide-angle scanning can be realized through slot coupling and parasitic patch loading; according to the invention, current transmission is destroyed or resonance is caused by slotting and the like, and second and third harmonics are inhibited; by designing the shape of the patch, the link loss can be reduced, and the antenna efficiency is improved; the antenna array plane architecture of the traditional ground radar is that an antenna and an antenna housing are independently designed, and the antenna and the antenna housing are integrally designed, so that the link loss is reduced; the metal layer is plated inside the PPS medium, the PPS medium has characteristics, and the antenna material has a protection function and is good in environmental adaptability.

The invention provides a multi-unmanned aerial vehicle cooperative hoisting radar antenna aerial operation device and a coordinate transformation method, and belongs to the technical field of unmanned aerial vehicle control. The device comprises a radar antenna, a device landing base and a multi-rotor unmanned aerial vehicle cooperative hoisting uniform force platform system; the multi-rotor unmanned aerial vehicle collaborative suspension uniform force platform system comprises a plurality of multi-rotor unmanned aerial vehicles, a rigid uniform force connecting ring, a carbon fiber tube, a suspension cable and a rigid connecting arm, the plurality of multi-rotor unmanned aerial vehicles are connected with the rigid uniform force connecting ring through the suspension cable, the carbon fiber tube is arranged on the rigid uniform force connecting ring, and the rigid connecting arm is connected with the rigid uniform force connecting ring through the suspension cable. The back of the radar antenna is provided with a supporting beam, one end of the rigid connecting arm is connected with the carbon fiber tube, and the other end of the rigid connecting arm is connected with the supporting beam. According to the scheme, the target pose of the radar antenna is efficiently and accurately decomposed into the cooperative motion instruction of the unmanned aerial vehicle cluster, and it is ensured that the ground radar antenna becomes a high-stability and high-precision working platform in the air.

The present invention discloses a method for realizing low power consumption of an airborne radiosonde in a secondary wind sounding radar. In this method, the ground radar measures the distance between itself and the airborne radiosonde, calculates the receiving channel gain of the airborne radiosonde, and controls the receiving channel gain of the airborne radiosonde by sending instructions to the radiosonde; the ground radar measures the distance between itself and the airborne radiosonde, adjusts the working mode of the ground radar and the code rate of the radar detection waveform code, and controls the code rate of the response waveform of the airborne radiosonde by sending instructions to the airborne radiosonde; the ground radar controls the sleep duration of the airborne radiosonde by sending instructions to the airborne radiosonde; the airborne radiosonde controls the working state of the radiosonde according to the working timing, and respectively controls the functional modules of the receiving channel and the transmitting channel to work in a time-sharing manner according to the current working state. Compared with the prior art, the present invention reduces the power consumption of the radiosonde, which is beneficial to extending the working duration of the radiosonde.

A monitoring system (1) for an orbiting space object (5) comprising a ground-based radar system (2) (7) including an antenna (6) with a controllable pointing direction for moving a space observation window (11) within a field of view (12), the pointing direction having a predetermined value (Zref) associated with the space object (5), the monitoring system (1) comprising ground-based optical sensors (3) (7) and a control unit (4) configured to determine a first orbital restitution (O1) from first positions (P1) of the space object (5) measured by the optical sensors (3), and, if the first orbital restitution (O1) crosses the field of view (12) of the radar system (2) outside the space observation window (11) associated with the predetermined value (Zref) of the pointing direction, to determine a command for the pointing direction of the antenna (6). Abstract figure: Figure 1

The present invention discloses an outdoor test method for ground radar power test, the steps are as follows: (1) the RCS of the UAV with a load is obtained by testing in a microwave darkroom in advance; (2) at the beginning of the experiment, the radar antenna far field condition is met and the power of the radar signal is measured; (3) the UAV echo power is calculated according to the UAV RCS data and the radar signal power reaching the receiving antenna surface of the load; (4) the load simulated echo power is adjusted to be equal to the UAV target echo power, at which time the target distance simulated by the load is the experimental distance between the UAV and the radar; (5) the load simulated target distance and echo power are adjusted until the radar just detects the UAV target, thereby obtaining the detection power of the radar to the UAV. The present invention combines the UAV platform and the load to test the power of the ground radar, the test distance only needs to meet the radar antenna far field condition, and the track state is controllable, the test cycle is short, and the cost is low.

An unmanned aerial vehicle includes a control station for controlling a first co-operating unmanned aerial vehicle, a radar system or ground based radar system configured to scan for objects within a detection coverage range and to provide scan data indicative of objects detected within the coverage range, and processing circuitry configured to generate full data type radar plots based on obtained scan data, select irregular type radar plots from full data type radar plots, generate and store one or more UAV object tracks, receive telemetric data and / or transponder data for said first UAV, determine for each UAV object track whether there is a match between data of the UAV object track and corresponding telemetric data and / or transponder data for said first UAV, and classify the UAV of a UAV object track as a first co-operating UAV when predetermined matching conditions are fulfilled.

The invention discloses a road surface defect detection method and system based on deep learning, and the method comprises the steps: firstly, synchronously collecting an original visible light image, an original infrared thermal imaging image and original ground radar data of a target road surface, and carrying out the preprocessing and data enhancement in sequence; transmitting the standard visible light image, the standard infrared thermal imaging image and the standard radar data to a feature extraction module, and extracting visible light features, infrared features and radar features; secondly, the visible light features, the infrared features and the radar features are mapped to a shared space after being subjected to feature splicing, and a fusion feature vector is generated through a multi-head attention mechanism and a feedforward neural network; and finally, fusing the feature vectors, and outputting defect types of the target road pavement in a classified manner through an output layer. According to the invention, the pavement surface and internal defects are synchronously detected, and the accuracy of road pavement defect detection is improved.

The application discloses an air-ground cooperative detection networking deployment optimization method, which comprises the following steps: firstly, a mathematical model of ground radar detection sensor networking deployment is established; secondly, a detection area is subjected to gridding treatment, and genetic algorithm is used to optimize the deployment of the ground radar detection sensor networking to obtain a Pareto solution; thirdly, the weak index of each grid of the detection area is calculated to obtain a weak matrix; then, the weak matrix is processed by using the breadth-first search thought to extract and sort weak areas; finally, air-based radar deployment tasks are formulated according to the weak areas, and an air-ground cooperative detection networking deployment scheme is finally generated. The application can make up for the poor detection performance of ground radar networking on low-altitude targets such as unmanned aerial vehicles and the insufficient scheduling mobility, improve the air-frequency domain coverage capability of the ground radar networking and the anti-electromagnetic interference and anti-stealth capability, and make the patrol route designation of the air-based radar detection sensor key task more professional and rigorous.

The invention discloses a radar rainfall deviation correction algorithm based on combination of probability density matching and a climate state ratio method. The radar rainfall deviation correction algorithm comprises collection and preprocessing of ground station observation data, PDF deviation correction of radar rainfall and climate state deviation correction of radar rainfall. According to the invention, effective utilization of rainfall observation data of a ground meteorological station is realized, deviation correction is carried out on a radar networking estimation rainfall product by using a ground station grid analysis field and a ground-radar climate state proportion analysis field, and the deviation between a radar rainfall estimation value and real rainfall is effectively corrected. According to the method, the discontinuity and systematic deviation of space-time distribution of a fusion product are reduced, the adaptability of the fusion product to complex terrains and rapid evolution precipitation scenes is enhanced, collaborative optimization correction of multi-scale and multi-type deviation is realized, and the reliability and service applicability of a radar precipitation product are remarkably improved.

1. The name of the product of this design: Airborne active calibration device. 2. Purpose of the product of this design: an active calibration device used to hover in the air to detect the performance of ground radar. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

Method for determining the current position of a rail vehicle (1) on a rail line (3) travelled by the rail vehicle (1), having the following features: a) detecting the soil structure (5) below the rail line (3) travelled by the rail vehicle (1) below the ground surface by means of a penetrating ground radar (10), b) transmitting the ground data (12) characterising the ground structure (5) recorded by the ground radar (10) by means of remote data transmission from the rail vehicle (1) to a remote evaluation point (2), c) comparing the soil data (12) received at the evaluation station (2) with data records (22) of a soil database (21) in which soil data characterising the soil structure of all rail lines (3) travelled by the rail vehicle (1) are stored, d) determining the current position of the rail vehicle (1) based on the detection of a sufficient degree of correlation of the ground data (12) received by the rail vehicle (1) with at least one data set (22) of the ground database (21) and a position reference of this data set (22) stored in the ground database (21).

The utility model provides a kind of electronic sounding apparatus and radar detection system based on double channel digital frequency modulation, sounding apparatus includes temperature sensor, humidity sensor, baroceptor, measurement conversion unit, transmitter and receiver, data acquisition module is used to receive temperature, humidity and air pressure signal in high altitude, single-chip microcomputer converts sounding signal into square wave signal and is transmitted to transmitter, transmitter sends square wave signal to ground radar, receiver has answering radar inquiry function, receives the answering signal generated by amplitude modulation ranging inquiry pulse sent by ground radar, inquiry pulse modulation is sent to transmitter, and answer pulse is sent back for ground radar reception;The utility model's sounding apparatus avoids the shortcomings of unstable ranging and easy to be disturbed by continuous wave ranging pulse, and cooperates with ground double channel wind finding radar, and the temperature, humidity, pressure, wind speed, wind direction in 30 kilometers from ground to high altitude, square 200 kilometers in air can be accurately detected.

A system and method for operating uncrewed craft, such as unmanned aerial vehicle (UAV) or drones 14, 15. Plural radar beacons 16, 17 are arranged about, e.g. in a path through, an area to be monitore

The application provides a satellite control system, method, electronic equipment and storage medium. The system comprises: a ground radar detection station, a control adjustment system and an excitation emission source. The ground radar detection station is used for detecting position data and attitude data of a satellite relative to the ground in real time, and transmitting the position data and the attitude data to the control adjustment system through a first signal transmission network between the ground radar detection station and the control adjustment system. The control adjustment system is used for determining an excitation signal required by the excitation emission source to emit to the satellite according to the position data and the attitude data. The excitation emission source is used for emitting the excitation signal to the satellite through a second signal transmission network between the excitation emission source and the satellite, so as to control the operation of the satellite and enable the satellite to run on a preset operation orbit where the satellite is currently located. The application can automatically control the operation of the satellite, so as to reduce the operation burden of a satellite tester.

The invention discloses an air defense target intelligent intention recognition method and system based on matrix game, and the method comprises the steps: collecting data of a battlefield monitoring system, and carrying out the preprocessing of the data, so as to guarantee the integrity of input data; establishing a game matrix between the air defense target and the ground radar, and solving and predicting a maneuvering strategy of the air defense target through game; the method comprises the following steps of: predicting a flight path of an air defense target by adopting a BiLSTM (Bidirectional Long Short Term Memory) network and combining a BiLSTM-Attention model of an Attention mechanism, and extracting key feature information; dividing the target trajectory into a plurality of sub-processes according to the flight trajectory features; a dynamic sequence Bayesian network (DSBN) is utilized to identify the combat intention of an air defense target, and the overall combat intention of the target is determined according to the inference process of a meta intention, a sub intention and a final intention. According to the method, the accuracy and the real-time performance of target intention recognition can be improved, and reliable decision support is provided for air defense combat.

The invention provides a method for alleviating interference of an SAR satellite on a ground radar. The method comprises the following steps: acquiring an acceptable interference level threshold and an interference probability threshold corresponding to a target ground radar; for the i-th transit of the SAR satellite, the transit time of the SAR satellite relative to the target ground radar is predicted, and according to the requirement of the ground distance resolution in task execution of the SAR satellite, it is determined that the interference power borne by the target ground radar is minimum and is smaller than or equal to a corresponding acceptable interference level threshold value; according to the beam parameters of the SAR satellite, the interference probability of the target ground radar is smaller than or equal to the corresponding interference probability threshold value, and a single transit scanning strategy for the target ground radar is formulated according to the determined beam parameters; and when the transit time arrives, a control command is uploaded to the SAR satellite according to the single transit scanning strategy so as to control the SAR satellite to scan according to the single transit scanning strategy. And coexistence between a synthetic aperture radar satellite and a ground radar system is realized.

The invention relates to a target tracking method based on multi-pulse response signal coherent accumulation, and the method comprises a calibration mode and a formal working mode: in the calibration mode, an active target is fixed at a known position, and a plurality of pulse response signals emitted by the active target are received; estimating a frequency difference and an initial phase difference between the response signal and the ground radar transmitting signal; in the formal working mode, receiving a plurality of pulse response signals transmitted by the active target, performing frequency and initial phase compensation on the pulse response signals according to the frequency difference and the initial phase difference, and then performing matched filtering to obtain a distance dimension compression result; arranging the compression results of the pulses according to a time sequence to form a fast time-slow time two-dimensional data matrix, and performing Fourier transform on the slow time dimension to realize multi-pulse coherent accumulation so as to obtain distance-Doppler two-dimensional information; and finally, determining the distance scale and Doppler scale of the target through peak detection to obtain the distance and radial speed of the active target.

The application provides a low-cost ground-layered antenna radome plate prepreg forming method and belongs to the field of composite material design and manufacturing. The application solves the existing problems in the processing of the ground-layered antenna radome, the mold for manufacturing the antenna radome is reformed, the mold retains the original functions and performances, and the mold is additionally provided with the functions of continuous heating and heat preservation through the reform, the wet hand lay-up process commonly used for the antenna radome is changed into the process form of the prepreg, the female mold of the antenna radome mold and the matched gland are reformed, the mold is provided with the continuous heating capacity, the middle-low temperature curing prepreg with the content of 45%-50% is selected as the reinforcing material, the product can be cured and formed in the mold without moving, and the low-cost prepreg forming of the ground radar antenna radome is realized.

The invention discloses ground radar display and control equipment with an adjustable display and control machine, which comprises a cabinet body and a display and control extension set, and is characterized in that a bottom rotating assembly of the display and control extension set is connected to a mobile platform, and the bottom of the mobile platform is slidably connected into the cabinet body through a sliding assembly; the rotating assembly comprises a middle shaft installed in the middle of the bottom of the display control extension, a flange plate is arranged on the outer side of the middle shaft, the bottom of the flange plate is installed on a moving platform, and the moving platform can slide out of the cabinet body. The rotating assembly is installed at the bottom of the display control extension, the display control extension is installed on the mobile platform through the rotating assembly, and then the display control extension is installed in the cabinet body through the mobile platform, so that when the back of the display control extension needs to be maintained and debugged, only the mobile platform needs to be pulled out, and then the display control extension is driven by the rotating assembly to rotate; the rear adapter plate of the display control extension set is just opposite to maintenance personnel on the side surface, so that a cable head on the rear adapter plate of the extension set can be conveniently inserted and pulled, the time for inserting and pulling the cable head is shortened, and the working efficiency of debugging personnel is improved.

1. The name of the product of this design: radar transmitter and receiver. 2. Purpose of this design product: This product relates to a transmitter and receiver used in ground radar. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.

The invention discloses a communication device for a sonde of a secondary anemometry air sounding radar. The device comprises an antenna module, a radio frequency module, a main control module, a sensor module and a power supply module, the radio frequency module is used for processing an inquiry signal received by the antenna module through a receiving channel of the radio frequency module and then outputting the inquiry signal to the main control module, and is used for processing a response signal generated by the main control module through a transmitting channel of the radio frequency module and then outputting the response signal to the antenna module; the control module is used for receiving a control instruction output by the main control module to control working states and channel gains of a receiving channel and a transmitting channel; and the main control module is used for analyzing a ground radar instruction, generating a control instruction according to receiving and transmitting states, and forming a response signal from sensing data of the sensor module according to a code speed. Compared with the prior art, the design of the communication device is simplified, the signal processing complexity is reduced, and the system reliability is improved.