33 results about "Terrestrial Time" patented technology

The invention discloses a terrestrial magnetism diurnal variation correction method based on terrestrial magnetism matching. Aiming at a terrestrial magnetism diurnal variation effect in terrestrial magnetism matched navigation and positioning, the invention provides a method for correcting the terrestrial magnetism diurnal variation effect based on an FMI (Finish Meteorological Institute) method and multi-dimensional characteristic quantity matching. The method comprises the following steps of: (1) selecting terrestrial magnetism matching characteristic quantities; (2) extracting a diurnal variation of each terrestrial magnetism matching characteristic quantity from actually-measured data of the terrestrial magnetism matching characteristic quantities based on the FMI method; (3) subtracting the corresponding diurnal variations by the actually-measured data of the terrestrial magnetism matching characteristic quantities and establishing a terrestrial magnetism real-time pattern; (4) matching the terrestrial magnetism real-time pattern with a terrestrial magnetism standard pattern based on the multi-dimensional characteristic quantity matching; and (5) outputting a matching result. According to the terrestrial magnetism diurnal variation correction method based on the terrestrial magnetism matching, the terrestrial magnetism diurnal variation effect in the terrestrial magnetism matched navigation and positioning can be effectively eliminated and the terrestrial magnetism matched navigation and positioning precision can be obviously improved.

A method for controlling the lateral movement of a terrestrial vehicle arranged to track a predetermined trajectory, particularly in an assisted driving or autonomous driving scenario, comprising: determining a lateral offset of the vehicle center of mass from the predetermined trajectory; determining a look-ahead error defined as a distance of a virtual look-ahead position of the vehicle center of mass from the predetermined trajectory; and controlling the steering angle of the vehicle so as to also minimize the lateral offset and the first derivative of said look-ahead error over time.

The invention relates to an indoor positioning method for a smartphone user based on terrestrial magnetism-corrected inertial navigation. The method comprises the following steps: dividing a to-be-positioned area into small grids according to a plane map of a building; allowing the smartphone user to acquire the intensity data of terrestrial magnetism at the center of each grid for a period of time by using a smartphone with a built-in magnetometer; averaging the intensity data of terrestrial magnetism acquired in each grid and constructing and storing an off-line terrestrial magnetism fingerprint database; allowing the user to start to walk with the smartphone, detecting steps and estimating step length by processing the data of an accelerometer of the smartphone, and acquiring an included angle between a movement direction and a true north direction and current intensity of terrestrial magnetism by processing the data of a gyroscope; acquiring a predicted value of a current state; calculating a covariance matrix and Kalman gain in a prediction phase; calculating observation and measurement results; and updating a state. The method provided by the invention can realize high indoor positioning precision only by using the smartphone.

The invention discloses a composite parking stall detection method and device based on Iilluminance and terrestrial magnetism combined detection. According to the method, detection is carried out by combining illuminance and terrestrial magnetism; the method comprises detection for vehicle driving-in and driving-away events; in detection for a vehicle driving-in event, if a magnetic field is changed, the illuminance is decreased, and the decreased illuminance reaches a threshold, it is determined that a vehicle drives into a parking stall; and in detection for a vehicle driving-away event, the vehicle which is driven away disturbs the magnetic field, and if the magnetic field is changed while the illuminance is increased, it is determined that the vehicle drives away from the parking stall. According to the invention, terrestrial magnetic field disturbing and ambient light shielding effects of the vehicle body are utilized at the same time, the problem that adjacent parking stalls may interfere each other in a traditional pure terrestrial magnetism detection technology can be overcome, and the detection accuracy is improved substantially.

The invention discloses an indoor positioning algorithm capable of combining inertial navigation with terrestrial magnetism on the basis of credibility. The algorithm comprises the following steps that: in a positioning initial stage, selecting a coordinate original point in a positioning area, establishing a coordinate system, and dividing the area according to different paths; through inertial navigation, obtaining the position coordinate of each step, obtaining standard terrestrial magnetism information on each coordinate point, and establishing an inertial navigation terrestrial magnetismfingerprint library; in a positioning process, according to an initial position point, obtaining a walking coordinate, and through a path matching algorithm, obtaining inertial navigation informationsource credibility and path similarity; according to the path similarity, carrying out clustering to obtain a local area terrestrial magnetism fingerprint library; applying an improved particle filtering algorithm to obtain terrestrial magnetism matching similarity, obtaining the coordinate point with the highest similarity, carrying out secondary matching with the local area terrestrial magnetismfingerprint library to obtain terrestrial magnetism information source credibility; and carrying out adaptive weighting algorithm combination on the terrestrial magnetism information source and the inertial navigation information source to obtain the point with the highest credibility, wherein the point with the highest credibility is an estimated position. By use of the algorithm, positioning accuracy and speed can be improved, and convenient, quick and accurate positioning service is provided for common users.

A bearing display device having a terrestrial magnetism sensor measuring terrestrial magnetism, a display section, and a control section for calculating a geographical bearing based on the value measured by the terrestrial magnetism sensor and causing information on the calculated bearing to be displayed on the display section. The control section monitors variation in behavior of an electronic component mounted on the bearing display device and causes the information on the bearing displayed on the display section to be updated depending on the behavior variation.

The invention discloses a trunk line self-optimizing signal control method based on terrestrial magnetism, and mainly relates to the field of arterial road intersection signal optimization control. Through the comprehensive application of novel geomagnetic vehicle detection equipment, the method achieves the dynamic detection and signal optimization processing of traffic conditions of a plurality of intersections on a trunk line. The method comprises the steps: geomagnetic equipment installation; data collection and communication; the processing and calculation of a trunk line self-optimizing signal; and the publishing and control of a signal instruction. The invention also provides a trunk line self-optimizing signal control device based on terrestrial magnetism. The method and device employ the technology of two-dimensional active-type terrestrial magnetism, can achieve the accurate detection of the real-time traffic conditions of a plurality of intersections of the trunk line, makes an optimized signal control scheme, provides a real-time decision and emergency processing information for the traffic management and control, and improves the operation efficiency and service level of the traffic of the trunk line.

A hybrid cellular radiocommunication system includes base stations defining terrestrial cells covered by satellite umbrella cells. The base stations are distributed so as to be distinguishable by the satellite cell according to a time-invariant distribution function, and the system includes a device for maintaining, permanently and in the same link direction, congruence of the coverage of each satellite cell with respect to coverage of the terrestrial cells associated with the base stations contained in the satellite cell, with coverage of a satellite cell being congruent with a predetermined terrestrial coverage set when the predetermined coverage set is included in the satellite coverage.

A system for bidirectional data transmission in a telecommunication network comprises at least two distinct access networks to a mobile terminal, comprising at least one hybridation gateway that is configured to constitute an access point to each of the access networks, and to perform at least: control functions for all of the access networks, selection functions for the access network or networks selected for the data transmission, network layer functions, and data link layer functions, and wherein each of the access networks comprises at least one access gateway configured to perform at least physical layer functions.

The invention provides a rendezvous control method for spacecrafts between orbits at instable libration points of solar-terrestrial systems. The rendezvous control method includes determining rendezvous initial orbits, target orbits and rendezvous process time of the spacecrafts between the orbits at the libration points of the solar-terrestrial systems and building rendezvous kinetic models of the controlled spacecrafts; creating nonlinear optimal control problems on the basis of the built rendezvous kinetic models of the controlled spacecrafts; solving the nonlinear optimal control problems by the aid of symplectic preservation numerical processes within a long finite time to obtain co-state variables; updating control input in current time subintervals by the aid of the obtained co-state variables, kinetically simulating each time subinterval and acquiring state variables of the current spacecrafts by the aid of navigation processes; carrying out progression on the time subintervals, utilizing terminal states of the current spacecrafts as initial states of a next time subinterval, and sequentially repeatedly carrying out procedures from a step 302 to a step 400 until rendezvous tasks of the spacecrafts between the orbits at the instable libration points are completed. The rendezvous control method has the advantage that the high-precision spacecraft rendezvous objectivity and performance can be guaranteed by the rendezvous control method.

A space system comprises two main satellites each describing a distinct elliptical orbit around the Earth, each of the two orbits being such that the space system makes it possible to provide a permanent or continuous service over at most a terrestrial zone comprising a polar cap and a region of different latitude over an interval of longitudes.

A method for harmonizing a frame of reference of an angular positioner to receive a moving body relative to the terrestrial frame of reference, the angular positioner carrying a measurement device for taking inertial measurements of the moving body, the method includes obtaining, using inertial measurements taken by a measurement device on-board the angular positioner during at least one predetermined operating period, values representative of a local magnitude of gravity as perceived by the measurement device and/or of a speed of rotation of the earth, the angular positioner being held stationary during the at least one operating period; evaluating, using the obtained values, at least one angular bias affecting the frame of reference of the positioner; and harmonizing the frame of reference of the positioner relative to the terrestrial frame of reference by compensating for the at least one angular bias as evaluated in this way.

A method and system for synchronizing terrestrial nodes equipped with GNSS (Global Navigation Satellite System) receiver belong to a terrestrial network. Synchronization is achieved by selecting terrestrial node to be synchronized to form a synchronization zone. The clear sky view solid angle shared by the terrestrial nodes is determined. The terrestrial nodes acquire a rough time reference sent by a satellite that can be viewed by the terrestrial nodes in the clear sky view solid angle. A common synchronization date is determined for all the terrestrial nodes. And, at the common synchronization date all the terrestrial nodes acquires a predefined sequence from the satellite. The terrestrial nodes uses this sequence to adjust the reference time.

A terrestrial magnetism correction apparatus for automatic correcting converging error caused by terrestrial magnetism determined by installation direction of cathode ray tube (CRT), including horizontally magnetism detector for detecting horizontally magnetism; a vertically magnetism detector for detecting vertically magnetism; and a microprocessor for automatic magnetism correcting, wherein coils are arranged on predetermined position of CRT, terrestrial magnetism acts on coils and generates measurable current or voltage when coils moved horizontally and vertically, calculating corrected value determined by detected terrestrial magnetism to automatic compensate terrestrial magnetism, conveniently correcting accurately without need of hand correcting when spectators looking screen.

The invention discloses a terrestrial latitude measuring instrument. The instrument comprises a supporting frame, a rotating platform, a motor, a horizontal shaft, and a base which is fixedly connected with the supporting frame, wherein the horizontal shaft is supported on the supporting frame through a bearing; a speed reducer is connected to the motor and fixedly connected to the outer side of one end of the supporting frame; an output shaft of the speed reducer is fixedly connected with the horizontal shaft; an angle coder is arranged on the motor; the rotating platform is fixedly connected with the horizontal shaft; a shading barrel and nine light sensitive elements are arranged on the rotating platform; a through hole is formed in the top end of the shading barrel; a lens is mounted on the through hole; the nine light sensitive elements are distributed at the inside and outside of the shading barrel; a gradienter, a compass and a display are arranged on the base; the angle coder, the light sensitive elements, the motor and the display are all connected with a controller in the base. The instrument is simple in structure, reasonable in design, convenient to mount, fast to measure the local latitude, accurate and effect in measurement result, simple and convenient to operate, good in use effect, and high in popularization value.

The invention provides a terrestrial magnetism based personnel positioning method and device, and belongs to the field of information technology. The method comprises that terrestrial magnetism information of multiple positions in the personnel travel process is collected; personnel position information is determined according to a data matrix model and the collected terrestrial magnetism information of the multiple positions. The data matrix model comprises correspondence between terrestrial magnetism information and position information. The terrestrial magnetism based personnel positioningmethod and device can realize convenient and accurate positioning and is low in cost.

The invention belongs to the technical field of terrestrial heat, and particularly relates to a device capable of regulating a terrestrial heat heating system according to the thermal comfort degree value of the human body. The device comprises theterrestrial heat heating system and a regulating system, wherein the terrestrial heat heating system comprises a solar energy heat collecting plate, a terrestrial heat pipe which is arranged below the earth surface and is connected with the solar energy heat collecting plate, a water storage tank, and a heating pipe arranged below the solar energy heat collecting plate; one end of the heating pipe is connected with a port of a three-way valve; the other two ports of the three-way valve are respectively connected with the terrestrial heat pipe andthe water storage tank; the water storage tank is connected with the terrestrial heat pipe through a pipeline; the other end of the terrestrial heat pipe is connected with the other end of the heating pipe; and the regulating system comprises a moisture measuring device, a temperature measuring device and a processor, wherein the input end of the processor is connected with the moisture measuringdevice and the temperature measuring device, and the output end of the processor is connected with the three-way valve. The device disclosed by the invention is simple in structure.