41 results about "Geomagnetic storm" patented technology

The invention discloses a flight path deduction and calibration method based on indoor geomagnetic track matching. The method comprises the following steps of (1) forward and reverse geomagnetic track matching; (2) three-dimensional geomagnetic fingerprints: three-dimensional original geomagnetic data with posture features, which are read by a geomagnetic sensor in a carrier coordinate system, are mapped to uniform three-dimensional geomagnetic fingerprints in a navigation coordinate system; (3) reverse geomagnetic fingerprints: a reverse geomagnetic track is generated according to a forward geomagnetic track; (4) a geomagnetic calibration triggering mechanism based on indoor and outdoor scene detection; (5) an indoor geomagnetic path matching algorithm based on a FastDTW algorithm. According to the flight path deduction and calibration method and device based on the indoor geomagnetic track matching, the training work at an early stage is not needed, an inertial sensor with low cost and auxiliary sensors are used, and an accumulated error of an inertial measurement technique is eliminated by utilizing the difference of indoor different path geomagnetic sequences, so that accurate positioning and navigation by personnel are realized without dependence of external environment deployment and in case of an emergency.

The invention discloses an atmospheric resistance perturbation modeling and calculating method for a low earth orbit satellite. The method is specifically implemented according to the following steps:1, establishing a Box-Wing model of a satellite; 2, establishing a piecewise linear atmospheric resistance perturbation model; 3, according to the Box-Wing model established in the step 1 and the piecewise linear atmospheric resistance perturbation model established in the step 2, calculating the folded atmospheric resistance perturbation acceleration at the moment t. By utilizing the method to calculate the atmospheric resistance perturbation of the satellite, atmospheric resistance perturbation calculation errors caused by the fact that a traditional single atmospheric resistance factor isdifficult to accurately describe atmospheric changes can be overcome, the orbit determination precision is effectively improved, and technical support is provided for precise orbit determination of alow-orbit satellite, especially precise orbit determination under special conditions such as magnetic storm.

An apparatus for exploring the ocean floor including a geo-magnetic sensor is disclosed. The apparatus comprises an upper frame which has an airplane shape in order to minimize surface resistance according to the resistance of ocean currents and seawater when moving inside the ocean floor and where multiple hollow holes are formed on the surface thereof; a lower frame which is coupled with the lower part of the upper frame, which includes a rectangular geo-magnetic sensor having a hollow hole inside thereof, where multiple hollow holes are formed on the surface thereof at regular intervals in order to minimize surface resistance according to the resistance of ocean currents and seawater when moving inside the ocean floor, and which is designed to facilitate submerging into the ocean floor; and a control unit which is mounted inside the upper frame in order to control the driving of the geo-magnetic sensor. The lower frame is coated with a waterproof film on the inside surface in order to prevent the geo-magnetic sensor from being in contact with seawater.

The invention relates to a cathode protection device and a protection method thereof. The cathode protection device comprises a cathode protection constant potential rectifier, a positive power electronic switch set, a negative power electronic switch set, a current transformer and a computer controller, wherein the positive power electronic switch set, the negative power electronic switch set, the current transformer and the computer controller are serious into a protected electric appliance loop; and the computer controller receives sampling information coming from the current transformer, judges the working mode of the cathode protection constant potential rectifier, further controls opening and closing of the positive power electronic switch set and the negative power electronic switch set, transmits a failure reset command to a latch in a timing mode according to the preset time, and clears up a second-stage failure latch signal. The problem that grounding apparatus, like the cathode protection constant potential rectifier, which are connected into a pipe are possibly burnt under the conditions of geomagnetic storms, direct current transmission systems, nuclear electromagnetic pulses and the like is solved.

The invention discloses a method for early warning of geomagnetic storm-induced cardiovascular and cerebrovascular events by using multiple space weather observation data. data, high-energy ray detection data, solar-terrestrial space environment parameters, and cosmic ray flow data; according to the time of observation data and the probability of affecting the geomagnetic field, the early warning probability of multi-band observation data is classified and graded, and used as a geomagnetic storm The early warning index for inducing cardiovascular and cerebrovascular events is used for early warning of the event; the method of the present invention has the advantages of early prediction time, large amount of observation data, reasonable scientific basis, long warning time, high efficiency and accuracy.

The invention relates to a long-distance buried oil and gas pipe network electrolytic coupling segmentation method for preventing geomagnetic storm disasters. The method comprises the steps that 1, aiming at a determined line, site selection of gas transmission stations and oil transmission stations is carried out according to the current standard; 2, geomagnetic storm disaster sudden change points of the line are found out through a pipe network geomagnetic storm disaster sudden change point scanning search method, and site selection optimization is carried out; 3, pipeline electrolytic coupling segmentation is carried out; 4, a segmentation result is output. According to the long-distance buried oil and gas pipe network electrolytic coupling segmentation method for preventing the geomagnetic storm disasters, geomagnetic induction current (GIC) and the pipe-to-soil potential (PSP) negative accumulation effect generated by the geomagnetic storm disasters in a long-distance electrical continuous buried oil and gas pipe network can be reduced, cathodic protection on a short-distance buried oil and gas pipeline can be further implemented, the capacity for the buried oil and gas pipeline to prevent the geomagnetic storm disasters is improved, and the service life of the pipeline and related equipment is prolonged.

The invention belongs to the technical field of crossing of power systems and geophysics, and relates to a geomagnetic disturbance geoelectric field calculation method based on a block geodetic electrical structure, which comprises the following steps: S1, establishing a block geodetic three-dimensional electrical structure model; s2, adopting a geoelectric field algorithm based on a Maxwell equation; s3, calculating a geoelectric field component magnitude of the geomagnetic storm GMD; and s4, determining the maximum value and direction of the geoelectric field component of the geomagnetic storm GMD. According to the method provided by the invention, the ground is partitioned according to the city-level jurisdiction of the provincial power grid, the three-dimensional electrical structure model of the ground is established according to the city-level jurisdiction, the geoelectric field of the geomagnetic storm GMD is calculated, and then the GIC of the power grid of each region is calculated, so that the calculation precision and the calculation speed of the geoelectric field of the geomagnetic storm GMD and the GIC of the power grid are improved.

The invention relates to a proton type seabed geomagnetism diurnal variation station and a geomagnetic measurement method. The proton type seabed geomagnetism diurnal variation station comprises a main control system on a deck and an underwater geomagnetic measurement system. After the main control system on the deck finishes parameter setting of the geomagnetic measurement system above water, thegeomagnetic measurement system is delivered to a seabed for measurement; after the geomagnetic measurement system finishes measurement work, an acoustic transducer awakens an acoustic response moduleof the geomagnetic measurement system for release; the acoustic response module supplies power to a fuse wire to open a release mechanism to cast away balancing weights, so that a pressure resistantcabin emerges from the water surface by means of buoyancy; when judging arrival at the water surface, a water pressure sensor starts a GPS and sends the position of the geomagnetic measurement systemto the main control system for recovery; when the geomagnetic measurement system is fished to the ship, the main control system on the deck acquires measured geomagnetic data and state information viaa wireless function. The proton type seabed geomagnetism diurnal variation station and the geomagnetic measurement method can guarantee effective recovery of the geomagnetic measurement system whileguaranteeing that geomagnetism diurnal variation data can be obtained.

The invention provides a low-orbit detection hot layer atmosphere multi-factor separation and feature extraction method. The method comprises low-orbit atmosphere multi-source influence factor separation and disturbance atmosphere feature extraction in a magnetic storm process. The low-orbit atmospheric multi-source influence factor separation comprises the following steps: based on low-orbit detection atmospheric data and external geophysical condition data at the same moment, performing ascending and descending orbit separation on detection orbit data, and then recombining a detection data sequence according to a nearest neighbor condition; correcting the height of the atmosphere in the processed range based on the empirical mode; performing classification denoising processing on the recombined data based on a method of combining time sequence superposition median and error analysis; and, based on gridding atmospheric parameters of multi-condition classification processing, separating multi-source influence factors of high-level atmosphere, and extracting influence characteristics of local time, latitude, season, terrestrial magnetism and solar radiation on hot-layer atmosphere.The method is small in feature extraction error.

Control section (160) is configured to measure the azimuth of electronic device (100) on the basis of the result detected by geomagnetic sensor (120) for detecting geomagnetism, and on the basis of the result detected by motion sensor (130) for detecting movement of electronic device (100), and is configured, while motion sensor (130) is detecting that electronic device (100) is stationary, to measure the azimuth of electronic device (100) only on the basis of the result detected by motion sensor (130), and the azimuth measured by control section (160) is displayed by display section (170).

The invention provides a geomagnetic positioning navigation sensor. The geomagnetic navigation sensor with a Co-based amorphous wire serving as a sensor probe has the advantages of being high in resolution, high in response speed, high in anti-interference performance, low in power consumption, small in size, good in stability and the like, and can be widely applied to positioning navigation of carriers (including but not limited to automobiles, ships, airplanes, aerospace and the like, the same as below). Compared with the prior art, the sensor has the remarkable advantages that the sensor isin a three-axis orthogonal special structure, a geomagnetic field three-component value can be tested, and position information of the carriers can be obtained through comparison with a geomagnetic map; the giant magneto-impedance effect of the amorphous wire is utilized so that the response speed of the sensor can reach 1 MHz, magnetic measurement can be carried out on the three-dimensional direction of measurement points, after vector calculation, positioning navigation is carried out by using the geomagnetic vector uniqueness principle of geomagnetic resources, and the sensor has the capacity of competing with a GPS; meanwhile, the sensor is not interfered by external signals, and is low in manufacturing and maintenance cost and easy to communicate with a computer; in the navigation (including but not limited to flight or sailing, running and moving, the same as below) process of the carriers whether the position and speed of the carriers in the range with the radius of 500 m are changed or not can be detected according to the principle that geomagnetic objects influence geomagnetic changes.

The invention relates to the technical field of magnetic storm induction geoelectric fields, in particular to an induction ground electric field adjustment distance calculation method and device based on the finite element method. The induction ground electric field adjustment distance calculation method based on the finite element method comprises the steps of determining a three-dimensional ground conductivity model of an induction ground electric field, and determining a two-dimensional plane ground conductivity model according to the three-dimensional ground conductivity model; based on a two-dimensional plane earth conductivity model, determining distribution conditions of induction earth electric fields under different frequencies according to a finite element method; and according to the distribution condition of the induction ground electric field under different frequencies, determining the induction ground electric field adjustment distance under different periods. According to the scheme, the invention is not influenced by the frequency range, can be used for calculating the adjustment distance in the whole geomagnetic disturbance period, effectively improves the calculation efficiency, and lays a foundation for accurately evaluating the geoelectric field and power grid risk of the coast effect in the magnetic storm period.

The invention relates to the technical field of magnetic storm induction geoelectric fields, and particularly relates to a magnetic storm induction geoelectric field calculation method and device considering a coast effect. The magnetic storm induction geoelectric field calculation method considering the coast effect comprises the steps that a geoelectric conductivity model is determined, original magnetic storm data is collected, and a geoelectric field base value is determined according to the geoelectric conductivity model and the original magnetic storm data; transmission line characteristic parameters of the geoelectric conductivity model are determined, and the distortion electric field negative potential gradient is determined according to the earth electric field base value and the transmission line characteristic parameters based on the geoelectric conductivity model; and the magnetic storm induction geoelectric field is determined according to the geoelectric field base value and the distortion electric field negative potential gradient. By adopting the scheme, the calculation efficiency is effectively improved by avoiding the use of a numerical solution, the distribution condition of the magnetic storm induction geoelectric field in the direction perpendicular to the sea-land boundary surface can be given, and meanwhile, the method can be used for evaluating the influence of the transverse conductivity change on the geoelectric field and the GIC in the long conductor during the magnetic storm period.

The invention discloses an optimization method for governing geomagnetic storm power grid disasters by adopting small resistance, which belongs to the field of power grid safety and disaster prevention and control. The method mainly comprises four aspects of power grid GIC theoretical calculation, construction of a GIC governance optimization model, a target function and constraint conditions, optimization calculation by adopting an improved NSGA-II algorithm, and obtaining of an optimization scheme through fuzzy membership evaluation. The four technologies coordinate with one another, effective regulation and control over the power grid GIC and voltage fluctuation are achieved, the reliability of power grid operation and the economical efficiency of governance can be improved, and great significance is achieved for GIC governance in China.