13 results about "Differential GPS" patented technology

The invention provides a power grid anti-bird multichannel twitter sound source positioning and intervention method, which comprises the following steps: acquiring sound signals from a power grid area through a multichannel microphone array equipped with a laser radar calibration module, optimizing a separation threshold by adopting Fourier transform and combining a preset bird voiceprint feature library, separating twitter components and noise components, and performing interference on the twitter components and the noise components; pure birdsong signals are obtained; according to the pure birdsong signal, calculating the time difference between channels by adopting a time delay estimation method, dynamically correcting a preset threshold value by combining a real-time environment sensor, if the time difference exceeds the corrected threshold value, marking as an effective birdsong event, and adopting a centimeter-level differential GPS module to assist in determining the position coordinates of the birds; interference execution confirmation is received through an edge computing node and returned to a system log, a D-S evidence theory data fusion method is adopted to integrate the positioning coordinates and the risk level, if it is judged that the fusion result is consistent in a preset confidence interval, the bird damage monitoring model is updated based on an incremental learning algorithm, and real-time closed-loop feedback is obtained.

The application discloses a kind of based on direct wave and differential GPS ranging multi-transmit multi-receive radar time synchronization method, in the airborne distributed radar system of multiple radar units, two radar units at baseline end as signal transmitting source, all radar units have signal receiving ability and mutually in visible range.Two transmitting radars emit carrier frequency different linear frequency modulation wave, all radars receive direct wave and the echo signal of target reflection.Direct wave contains the time synchronization error between corresponding receiving and transmitting radar platform and baseline distance information.Obtain positioning information by means of differential GPS module, eliminate the baseline distance information in direct wave, and only contain time synchronization error direct wave as reference signal.Then the echo signal and reference signal are conjugated in frequency domain multiplication, that is, the echo signal can be matched filtered and time synchronization error compensated in distance direction.Each of all echo signals is processed above, and finally the time synchronization of distributed radar system is realized.

Differential GPS uses multiple reference stations in combination. [Solution] In a satellite positioning system using a differential GPS method, which includes a user station 2 and multiple reference stations 3a, 3b, the user station 2 obtains correction values ​​from the multiple reference stations 3a, 3b, applies these correction values ​​to the distance between itself and the navigation satellites 1a, 1b, 1c, obtains corrected distances for each navigation satellite equal to the number of reference stations that provided the correction value for that satellite, and for each of these corrected distances, sets a separate unknown corresponding to the receiver clock error for each of the reference stations 3a, 3b that provided the applied correction value, and then calculates the position of the user station 2.

To continue positioning calculation regardless of the presence or absence of a correction signal and to shorten an initial position calculation time in a satellite navigation system.SOLUTION: In a satellite navigation system including a GPS in United States and a quasi-zenith satellite system in Japan, in a wide-area differential GPS for generating and transmitting correction information on a clock error, a position error, and the like of a navigation satellite, the correction information is transmitted via a communication line different from a wireless correction signal from the satellite, so that positioning calculation is continued regardless of whether or not the correction signal is shielded in a user station, and the correction information transmitted in the past is repeatedly transmitted together with the latest correction information, so that an initial position calculation time (TTFF) in the user station is shortened.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of mine operation, and discloses a mine operation helmet based on SLAM, which comprises an operation helmet, the top of the operation helmet is provided with a differential GPS, the right side of the operation helmet is fixedly provided with a fixing plate, the front side and the rear side of the bottom of the fixing plate are both provided with fixing grooves, and the front side and the rear side of the bottom of the fixing plate are both provided with a through hole. And rotating rods are rotationally mounted in the two groups of fixing grooves. By pressing the button, the control rod extrudes the tapered wedge into the connecting column, after a worker takes down the shell, the shell and the grip are spliced conveniently, fixing is completed by inserting the connecting column into the mounting plate, and compared with a traditional device, the SLAM is integrated on the operation helmet, and meanwhile, the SLAM and the grip are integrated into the mounting plate. According to the mine positioning device, the working personnel can conveniently position in a mine, and the working personnel can more conveniently operate by holding the shell when high-precision positioning and map construction are needed, so that the safety and efficiency of operation are improved.

The invention provides an intelligent lock control system of a ship, and relates to the field of intelligent ships, the system realizes centimeter-level positioning and avoids false triggering of an electronic virtual lock by optimizing Bluetooth communication of an entity lock, ensuring stable communication of equipment of the whole ship by using adaptive frequency hopping and AES encryption technologies, and combining a differential GPS with an inertial measurement unit and Kalman filtering. According to multi-sensor fusion path planning based on deep reinforcement learning, the position and course of the ship are dynamically corrected, and different berthing scenes are adapted. The system supports multi-mode switching such as long-term parking and temporary parking, and the triggering range, the operation authority and the verification requirement of the virtual lock can be adjusted; the lock cylinder, the electric quantity and the communication operation state of the entity lock are monitored in real time through multiple sensors, a three-level fault early warning mechanism is established, an alarm is automatically given and maintenance is notified when abnormity occurs, and the entity lock works independently to guarantee safety when the electronic virtual lock fails. According to the invention, the intelligence and safety of ship lock control are improved, and the method is suitable for diversified water berthing scenes.

A method for creating a map representation of a road traffic network for navigation of a vehicle. The method includes: receiving environment sensor data from environment sensors of a plurality of vehicles of a vehicle fleet, using an external computing unit; carrying out a SLAM method on the received environment sensor data and ascertaining a SLAM map representation of the road traffic network traveled by the vehicles, using the external computing unit; receiving differential positioning data of a differential global positioning system of at least one vehicle of the vehicle fleet, using the external computing unit; integrating a pose information item of the positioning data into the map representation, relating to at least one pose of the vehicle on a road of the road traffic network, and creating a map representation enriched with the pose information item, using the external computing unit.

The invention discloses an integrated asset checking system and method based on an automatic driving patrol car, the system comprises an edge machine room and the automatic driving patrol car, and an x86 server deployed with T-Rex2 and YOLOV13 is arranged in the edge machine room; a laser radar, a panoramic pan-tilt camera and a WiFi antenna are fixedly installed on the top of the automatic driving patrol car, a differential GPS sensor is fixedly installed on the side face of the automatic driving patrol car, an inertial sensor and an AI reasoning box are fixedly installed in the automatic driving patrol car, and FastLIO2, ROS2 + rviz and an error state Kalman filter are deployed in the AI reasoning box. The inertial sensor, the laser radar, the panoramic holder camera and the differential GPS sensor are all connected with the AI reasoning box, and the AI reasoning box is connected with the x86 server through the WiFi antenna. According to the invention, the application of the automatic driving patrol car in asset checking is expanded, the accuracy, coverage efficiency, real-time performance and data security of asset checking are improved, and the operation cost is reduced.

To enable a user to grasp positioning accuracy in a differential GPS (DGPS).SOLUTION: In a satellite navigation system including a GPS in the United States and a quasi-zenith satellite system in Japan, when configuring a differential GPS (DGPS) in which a reference station is installed to correct a positioning error, after obtaining correction information from a plurality of reference stations, a maximum value of a positioning error as a result of performing DGPS positioning to which correction information of each of other reference stations is applied at a position of a specific reference station, a maximum value of a positioning error as a result of performing DGPS positioning to which correction information of the specific reference station is applied at a position of a reference station other than the specific reference station, or a maximum value of a difference as a result of converting correction information of each of the plurality of reference stations into a correction amount of a position at the position of the specific reference station is provided to a user station as an index of positioning accuracy when the specific reference station is used.SELECTED DRAWING: Figure 1

A robot repositioning method based on the combination of GPS and laser radar, which utilizes the characteristics of differential GPS outputting more accurate position in open environment and loop detection performing better in complex environment, and realizes complementary advantages. UTM projection is used, which converts the longitude and latitude coordinate information output by GPS into the point cloud map coordinate system. Compared with the traditional repositioning method relying on point cloud registration search, it has higher robustness and accuracy.

The invention relates to the technical field of power system safety monitoring, in particular to an icing monitoring method, system and device for a power transmission line and a medium. The method comprises the following steps: respectively acquiring the sag of the power transmission line and the icing thickness on the power transmission line in real time through a differential global positioning system and a millimeter wave radar, and taking the sag and the icing thickness as measurement vectors; through the three-dimensional physical model of the power transmission line, the sag of the power transmission line and the icing thickness on the power transmission line are obtained in real time to serve as state vectors; acquiring the three-dimensional acceleration of the power transmission line in real time; and based on a Kalman filter, estimating the icing state of the power transmission line by using the measurement vector, the state vector and the relationship between the measurement vector and the state vector, and in the estimation process, when the three-dimensional acceleration of the power transmission line is greater than a preset threshold value, determining the icing state of the power transmission line according to the deviation degree of the three-dimensional acceleration. The noise covariance matrix of the Kalman filter is increased, and comprehensive, accurate and real-time state cognition can be carried out on line icing and dynamic characteristics.

The invention relates to the technical field of unmanned aerial vehicle flight positioning, and provides a technical scheme for realizing centimeter-level accurate positioning of an unmanned aerial vehicle through an ultrasonic positioning technology in a field bridge inspection environment with poor GPS signals. A stable space reference network is formed by establishing a space coordinate system and installing a plurality of ultrasonic receivers with known accurate space coordinates on a bridge structure, and the system adopts a fusion algorithm of time synchronization-real-time speed measurement-trilateral positioning, so that the scheme fundamentally overcomes errors of traditional sound velocity caused by temperature, humidity, air pressure and the like; the core ultrasonic transmitting and receiving equipment of the system selects industrial-grade mature and low-cost modules, the hardware cost is obviously lower than that of a laser radar or a high-precision differential GPS and other schemes, and a sustainable, economical and reliable positioning solution is provided for long-term health monitoring of the bridge.

The invention discloses an unmanned ship anti-storm system, an unmanned ship is provided with an anti-storm sensor, the anti-storm sensor comprises a wind speed and direction sensor, a hull attitude sensor, a differential GPS, a water flow velocity sensor and a water pressure sensor, and the anti-storm sensor is connected with a data fusion module and outputs an induction signal to the data fusion module. The data fusion module is connected with and outputs fusion signals to the interference modeling module, the interference modeling module is connected with and outputs interference modeling data to the supplementary control module, and the supplementary control module is connected with and outputs supplementary parameters to the posture adjustment module. The attitude adjustment module is connected with the propeller execution module and outputs attitude adjustment parameters to the propeller execution module, and the propeller execution module is a power system of the unmanned ship. According to the method, the positioning and navigation precision of the water surface unmanned intelligent vehicle can be improved, the influence of water waves on other unmanned sensors can be avoided through cooperation of the corresponding sensors and the control logic, the anti-interference capability of the unmanned ship is improved, and particularly, the anti-interference capability of a small ship is remarkably improved.