400results about How to "Improve positioning reliability" patented technology

The invention discloses a method for estimating a phase deviation in a precise single-point positioning technology, which comprises the steps of: firstly, carrying out parameter estimation on single-difference non-ionized layer combined ambiguity by using a position as a restraint condition according to data of a reference station in a tracking network; secondly, carrying out parameter estimationon single-difference wide-lane ambiguity by adopting an M-W combination, separating out a decimal part of the single-difference wide-lane ambiguity, and carrying out decimal deviation calculation by using a directional data statistic theory, modifying and fixing the single-difference wide-lane ambiguity as an integer; thirdly, resolving a single-difference L1 ambiguity floating point solution according to a single-difference non-ionized layer ambiguity estimation value and a single-difference wide-lane ambiguity integer solution, separating the decimal part, carrying out decimal deviation calculation by using the direction data statistic theory; and finally, broadcasting the wide-lane and the L1 phase deviation decimal part to a user of a roving station so as to be used for fixing the single-difference integral ambiguity solution of the wide lane and the L1 and further obtaining a PPP (Point to Point Protocol) static solution.

The invention discloses an electrical locomotive auto-passing neutral section control system. In the control system, a signal generator used for transmitting passing neutral section anticipating signal is arranged on a vehicle mainframe of an electrical locomotive, wherein the vehicle mainframe comprises a signal receiver used for receiving the passing neutral section anticipating signal, a memory unit used for storing the required time of locomotive neutral section operation, a clock, a speed sensor used for providing the current speed of the electrical locomotive for a controller, the controller used for outputting passing neutral section control signal and restoring the control signal and a contact network connection controller used for controlling a contact network electrical connection device. The timing that the invention executes the auto-passing neutral section operation is accurate and the reliability of the auto-passing neutral section control is high.

The invention relates to a GPS, GLONASS and BDS unified solution positioning method. The method includes the steps of conducting static relative positioning based on GPS, GLONASS and BDS three-satellite unified solution, and conducting dynamic relative positioning based on GPS, GLONASS and BDS three-satellite unified solution. By means of the GPS, GLONASS and BDS unified solution positioning method, solution is achieved through three-satellite unification, positioning accuracy and positioning reliability under the severe observation environment are improved, and initialization time is shortened; the partial ambiguity fixing strategies, namely, the partial ambiguity fixing method oriented to statistic relative positioning and based on the RMS and the partial ambiguity fixing method oriented to dynamic relative positioning and based on the coordinated factor matrix, are adopted, and therefore the success rate of ambiguity fixing can be increased, and accuracy and reliability of baseline solution can be improved; a unified observation model is set up, the method can be easily expanded and used, and the method has a wider application range.

The invention discloses a TOF and RSSI information fusion-based indoor wireless positioning method which is mainly used for solving a problem that in conventional indoor positioning technology lacks effective error control and is low in data utilization rate. An implementation solution comprises the following steps: step 1, according to communication time information between a target node and an anchor node, a symmetric bidirectional bilateral distance measuring algorithm is used to calculate distance between the two, and a fault threshold and an error threshold are set to filter the distance;step 2, according to RSSI value information between the target node and the anchor node, an MK model is used for converting the RSSI value information into distance between nodes after a Gaussian model is used for screening operation; step 3, the two types of distance is subjected to weighted fusing operation, and final distance is obtained; step 4, estimated solutions for the target node are obtained via circulation maximum likelihood estimation; step 5, the obtained estimated solutions are subjected to residual error weighted fusing operation, and coordinates of the target node are obtained. Via the method, insufficiency of conventional technologies that are large in positioning calculating errors and low in positioning result reliability, and data utilization rates and positioning andtracking precision are improved.

The invention establishes a GNSS (global navigation satellite system) differential signal broadcasting system and method combining internet and radio. The system comprises an internet module, an Ntrip client end, a position module and a radio part; the method comprises the steps of obtaining a differential signal from an Ntrip server by utilizing one CORS (continuously operating reference stations) authorized user name and a code matched with the same; and broadcasting through the radio to enable multiple moving station receivers in the covering range of the radio to perform high-precision RTK (real-time kinematic) positioning. The GNSS differential signal broadcasting system and method combining the internet and the radio are capable of reducing the server burden, and greatly saving the network communication cost and CORS serve cost of a user in comparison with the traditional RTK measuring mode via internet, are capable of omitting the trouble that the user needs to distribute a control network and erect a reference station by self in comparison with the traditional uni-base station radio RTK measuring mode, and are also capable of enhancing the positioning precision and reliability.

The invention relates to a GNSS tri-frequency precise single-point positioning ambiguity fixing method and belongs to the technical field of satellite navigation and positioning. The GNSS tri-frequency precise single-point positioning ambiguity fixing method comprises the steps of achieving precise single-point positioning resolving method by utilizing a tri-frequency pseudo-range and carrier phase observed value based on precise satellite ephemeris and clock correction provided by an IGS and phase delay correction resolved by a network; utilizing extra-wide-lane phase pseudo-range combination to resolve extra-wide-lane complete-cycle ambiguity, combining a resolved ionized-layer-free combination observed value ambiguity to resolve narrow-lane complete-cycle ambiguity and finally obtaining ambiguity-fixed high-precision single-point positioning result. By means of the GNSS tri-frequency precise single-point positioning ambiguity fixing method, the number of parameters to be estimated is decreased, computing efficiency is improved, and meanwhile precise single-point positioning ambiguity resolving success rate, positioning precision and reliability are improved.

The invention discloses a method for positioning low-current grounding fault sections of power distribution networks on the basis of transient energy analysis. The method includes steps of determiningpass frequency band ranges of digital filters and configuring a miniature PMU (power management unit) on each node of the power distribution networks; acquiring zero-sequence voltage phasors and zero-sequence current phasors of the various nodes of the power distribution networks by the aid of the miniature PMUs, judging whether faults of systems occur or not according to the zero-sequence voltage phasors and the zero-sequence current phasors of the various nodes, starting to position the faults if the faults occur, reading three-phase current signals recorded by the various miniature PMUs, computing transient zero-sequence currents of the various nodes by the aid of the three-phase current signals, processing the transient zero-sequence currents, computing transient energy of various sections, and determining the fault sections according to the transient energy of the various sections. The method has the advantages that physical meaning of fault features utilized by the method is clear, the method is high in positioning accuracy and reliability for the fault sections of various branch lines, and input of medium resistors connected with arc suppression coils in parallel or installation of signal injection equipment can be omitted.

The invention discloses an overhead power line whole construction process quality control system and method based on a mobile terminal and belongs to the field of data processing. The system comprisesa patrol inspection mobile client and a data center. The patrol inspection mobile client carries out bidirectional data communication with the data center and sends overhead power line construction site information, a location of a patrol inspection terminal and onsite patrol inspection records to the data center. The data center records the overhead power line construction site information, responsible personnel information, construction progress information, whole process digital archives and mobile client smart device identification information and provides overhead power line constructionstatistic data and patrol inspection record query for user terminals comprising the patrol inspection mobile client. Construction information passback and server background data push are carried outthrough a wide area network. An information transmission process is realized rapidly in real time without an error. The interference-free reliable contact between an overhead power line construction site and the data center is realized. The construction patrol inspection process result recording authenticity and reliability are ensured.

The invention discloses a sill plate inner plate drawing die which comprises an upper die combination, a lower die combination and a blank holder combination. The lower die combination comprises a lower die seat and a terrace die fixed on the lower die seat through a screw. The terrace die comprises a terrace die seat and a terrace die insert fixed on the terrace die seat through a screw. The lower die combination, the upper die combination and the blank holder combination are all of the combination structure, so that the terrace die, a recessed die insert, a blank holding die insert and the die seats can be made of different materials, and the die manufacture cost can be greatly saved. Meanwhile, the terrace die, the recessed die insert and the blank holding die insert are made in a split mode, so that the die is smaller in size, convenient to machine and low in manufacture difficulty. The adopted location structures of square columns, guide sliding plates, rectangular grooves and rectangular protrusion blocks are high in strength, good in location reliable and capable of ensuring die assembly accuracy in long-term production.

The invention discloses an inertial auxiliary GPS/BDS fusion large-scale measurement device and method for quickly measuring a land parcel. The inertial auxiliary GPS/BDS fusion large-scale measurement device for quickly measuring a land parcel comprises a strap-down inertial navigation module(3), a GNSS OEM board card (2), a handhold notebook control terminal(100) and a FPGA central board card (4); the land parcel measurement method integrates continuous satellite signal tracking and inertial navigation location output, and is based on second pulse signal to realize data synchronization and integration; carrier wave phase observed values are adopted for tight combination location resolving; inertial auxiliary GPS/BDS fusion ambiguity resolving is realized; and a partial ambiguity fixing strategy is adopted which helps increase the success rate of ambiguity fixing. By use of the method, the location precision and reliability of the system in shielding regions and half-shielding regions are substantially increased. The method can be applied in various land parcel on-site measurement environments and can increase the work efficiency of a land parcel measurement.

The invention discloses a global navigation satellite system (GNSS) baseline solution reference satellite selecting method. The method mainly comprises the steps of establishing an inter-station difference single-difference model according to a GNSS carrier phase observation equation, and weakening influence from spatial correlation error; selecting a satellite according to base station and moving station common-view observation satellite list to construct a dual-difference model, resetting weight of each dual-difference observation value through an equivalent weight model based on an IGGIII model, and inhibiting influence from observation abnormity through a robust estimation model; calculating a variance inflation factor corresponding to each common-view satellite as a reference satellite according to the established dual-difference model; and calculating a VIF value to determine the reference satellite. The method, compared to an existing method, not only takes distribution structure of a spatial satellite into consideration but also focuses on quality of the observation value; therefore, the method can determine the most reasonable reference satellite and greatly improve both positioning accuracy and reliability.

The invention discloses an indoor and outdoor seamless positioning system and an indoor and outdoor seamless positioning method for an intelligent mobile phone and a mobile terminal. The system comprises a navigation satellite system, an MIMOWiFi access point, a satellite positioning reference base station, the intelligent mobile phone and mobile equipment, wherein each of the intelligent mobile phone and the mobile equipment comprises a satellite signal receiving and processing module, a WiFi signal receiving and processing module, an inertia measurement unit and satellite-inertia-WiFi flight time tight coupling positioning software; and the satellite-inertia-WiFi flight time tight coupling positioning software of the intelligent mobile phone or the mobile equipment solves the position of the mobile equipment according to satellite measured data, MIMO antenna element measured data, MIMO antenna element geocenter earth coordinates, inertia navigation data and pseudo-distance differential correction data. By close combination of satellite-WiFi and inertia navigation, the indoor and outdoor seamless positioning system greatly improves the positioning precision and the reliability of the mobile equipment and realizes indoor and outdoor high-precision seamless coverage.

The invention discloses a method for quickly calculating the fuzzy degree between RTK reference stations in a Beidou-compatible GPS/GLONASS network. In a network RTK model, the calculation accuracy of the fuzzy degree between RTK reference stations has a direct bearing on the precision of space error modeling of the troposphere, the ionosphere, and the like. In the multi-constellation fusion network RTK, the number of satellites increases significantly, which provides favorable conditions for quickly calculating the fuzzy degree. According to the invention, first, a high-altitude angle satellite is fixed according to a network RTK fuzzy degree calculation model with atmospheric delay priori information, and then, calculation is performed based on the observed value constraint atmospheric delay of a satellite of which the fuzzy degree is fixed and an observation equation corresponding to a low-altitude angle satellite or a newly rising satellite or an unlocked recaptured satellite so as to quickly fix the fuzzy degree of a satellite of which the fuzzy degree is not fixed. By adopting the method, the time for calculating the fuzzy degree between network RTK reference stations is obviously shortened, and the precision and reliability of network RTK positioning are improved.

A check valve for fluid includes a tubular member, a cap, and a flexible membrane. The tubular member includes a coupling section and an inlet. The coupling section of the tubular member includes a valve portion, an end face, and a positioning rod. The cap includes a coupling section coupled with the coupling section of the tubular member, an outlet aligned with the valve port, and a positioning rod on the outlet of the cap. The flexible membrane includes a positioning portion securely sandwiched between the positioning rods. The flexible membrane further includes a sealing circumference. When fluid flows in a reverse direction, the flexible membrane seals the valve port and the sealing circumference of the flexible membrane is supported by the end face of the tubular member. When the fluid flows in a forward direction, the flexible membrane is bent to allow the fluid to flow from the inlet to the outlet.

The invention provides a CT (computed tomography) machine and an X-ray collimator thereof. A good collimation effect can be realized. The X-ray collimator comprises a plurality of first plates and second plates. The first plates and the second plates respectively peripherally and axially extend on the CT machine and are spliced with one another, a through hole is formed by each two adjacent first plates and the two corresponding adjacent second plates in an enclosed manner, and extension lines of various side walls of each through hole intersect with one another at a focal point of an X-ray source, so that X-rays can conveniently linearly penetrate the through holes. The CT machine and the X-ray collimator have the advantages that the extension lines of the various side walls of each through hole intersect with one another at the focal point of the X-ray source, the through holes are perforated in extension directions of the various X-rays corresponding to the through holes, accordingly, the X-rays emitted from the focal point of the X-ray source can linearly penetrate the through holes and finally reach a detection unit of an X-ray detector without being blocked, and the good collimation effect can be realized; scattered light rays can be absorbed and blocked by the side walls of the through holes, so that interference of the scattered light rays on the X-rays positioned in the through holes can be prevented, an anti-scattering effect can be improved, and the detection precision can be enhanced.

The invention discloses an airplane onboard GPS and inertial navigation system combined positioning method. The method includes the following constructing steps that firstly, an inertial navigation angular speed error model is constructed, and an inertial navigation angular speed error is corrected through a GPS; a gyroscope output angular speed error model is constructed, an inertial navigation angular speed zero drift error is corrected through static or horizontal linear movement, an inertial navigation angular speed linear error is corrected through linear fitting of a Kalman filter, and finally the inertial navigation angular speed error is corrected; secondly, an accelerometer output acceleration error model is constructed, and an inertial navigation acceleration speed error is corrected by correcting an inertial navigation acceleration zero drift error and correcting an inertial navigation acceleration linear error through the Kalman filter. According to the airplane anboard GPS and inertial navigation system combined positioning method, due to the fact that the gyroscope output angular speed error model and the accelerometer output acceleration error model are constructed and the INS three-axis angular speed and the three-axis acceleration are corrected dynamically through the GPS, the GPS and the INS technology can be effectively combined.

The invention discloses an inspection system. The inspection system comprises a plurality of inspection targets, each inspection target is provided with a matched identity label, an inspection handheld terminal is provided with a recognition device capable of recognizing the identity label and is provided with a positioning device, and the inspection handheld terminal communicates with a server. An equipment body uses a two-dimensional barcode nameplate to replace a traditional inspection point, the requirement of the inspection system on an inspection instrument or special reading equipment is eliminated, and the basic inspection function can be achieved by using a commonly used smartphone or other mobile terminals. The inspection system is simple in structure, convenient to operate and low in construction cost, and is suitable for inspection of circuits and bodies under various outdoor environments.

The invention discloses an intermittent feeding mechanism for bowl blanks. Baffles are located on the two sides of a conveying support. One bowl blank is conveyed to the position below a main support through a conveying belt. When a position sensor detects the bowl blank, a positioning cylinder acts, a piston rod of the positioning cylinder pushes the baffles to approach the middle of the conveying support to block the bowl blank. Meanwhile, a lifting cylinder pushes a sliding plate to move downwards, and a lead screw motor drives sliders and clamping handles to come close to each other through a lead screw till the bowl blank is clamped; then, the lifting cylinder enables the sliding plate to move upwards, and the bowl blank leaves the conveying belt and moves upwards to be positioned; when intermittent time is up, the bowl blank is placed on the conveying belt, and the next bowl blank enters the mechanism; and the process is repeated. The intermittent feeding mechanism is used for the bowl blank intermittent conveying occasions in the ceramic production process, and the defects that a traditional bowl blank conveying device is low in efficiency and automation degree and the like are overcome.