136 results about "Correction number" patented technology

The invention discloses a BDS / GPS high-accuracy positioning method, relating to the field of satellite navigation. The method includes establishing a virtual reference station, acquiring the common-view satellite ephemeris and the satellite observation data received by a reference station Bi and a roving station M, and acquiring the geometry distance between the satellite and the reference station Bi; acquiring the pseudo range correction number of the reference station Bi; interpolating the pseudo range correction number of the virtual reference station by means of an algorithm of inverse distance to a power; interpolating the pseudo range correction number of the roving station by the roving station by means of an algorithm of inverse distance to a power; correcting the satellite pseudo range observation data received by the roving station by means of the pseudo range correction number of the roving station; and establishing a roving station satellite pseudo range observation equation to obtain the accurate coordinate of the roving station to complete the positioning. According to the invention, the safety hidden troubles of information leakage of the reference station because a multi-reference difference positioning method in the prior art must use the accurate coordinate of the reference station can prevented, and high-accuracy positioning is obtained.

A memory controller that has an error correction number correspondence table that stores an error threshold level in correspondence with an error correction number; an error threshold level storage section that stores an error threshold level for each block; an uncorrected number measurement section that measures an uncorrected number of an error correction for each block; an error threshold level modification section that, each time an uncorrected number of a certain block exceeds a predetermined number, modifies the error threshold level of the block; an encoder that performs encoding processing of data stored in memory cells belonging to each block with an error correction number that is based on an error threshold level and the error correction number correspondence table; and a decoder that performs decoding processing of data.

The invention relates to the technology of communication, and discloses a differential relay method and device for a global navigation satellite system. According to the invention, the method comprises the steps: enabling a transmission region of a server to be divided into a plurality of grid units, setting at least one differential relay in each grid unit; calculating a difference correction number of each differential relay through the server, and transmitting the position information of each relay and the difference correction numbers to a user terminal, so that the user terminal employs the position information and the difference correction number of the differential relay nearest to the user terminal for differential positioning, thereby facilitating the use of differential services. Moreover, the server can meet the demands of a large number of users only if the server calculates a fixed number of difference correction numbers, thereby improving the coverage and usability of the differential services. In addition, the user terminal does not need to upload the position information of the user terminal to the server, can carry out differential positioning through obtaining the difference correction number of the nearest differential relay according to the position information of each differential relay, and guarantees the crypticity of a user.

The invention discloses a high-accuracy position correction positioning system based on cloud computing. The high-accuracy position correction positioning system comprises a client-terminal, a differential server and a differential reference station network formed by multiple differential reference base stations. The differential server is connected with the client-terminal and the differential reference station network via a communication module. The differential server receives single-point positioning information of the client-terminal and real-time pseudo range observation information of the reference base stations. When the client-terminal is insufficient in single-point positioning accuracy and requests to the differential server for high-accuracy positioning, the differential server solves positioning information correction number and a correction satellite set formed by multiple satellites on the basis of the received single-point positioning information and the real-time pseudo range observation information. The client-terminal solves accurate positioning information to perform accurate positioning by utilizing the correction satellite set and the positioning information correction number. According to the correction positioning system, an accurate positioning service can be intelligently, rapidly and accurately provided to the client-terminal so that positioning is rapid and positioning accuracy is high; and the client-terminal acts as a data provider so that the client-terminal is low in computation burden and low in flow consumption.

The invention discloses a continuous operational reference system (CORS) base station cycle slip detection and recovering method, which comprises the following steps that: firstly, an ionized layer residual method is used for carrying out cycle slip detection, a satellite with the cycle slip and the corresponding observation value are determined, then, a single-epoch dual-frequency observation equation is built according to the cycle slip detection results, the single-epoch dual-frequency observation equation is divided into two types, the first type is cycle-slip-free observation equations, the second type is cycle slip observation equations, the cycle slip generated by a non-reference satellite is used as a gross error, the cycle slip generated by a reference satellite is used as a system error, the first type observation equations are used for carrying out parameter estimation, the cycle slip of the reference satellite is determined, the estimated parameters are introduced into thesecond type observation equations, correction numbers are calculated, the cycle slip values of the reference satellite are obtained, and finally, the cycle slip base station observation data is recovered according to the relationship between the base lines in a CORS triangular net. Because the error time strong correlation of the precise coordinate, the dual-frequency convection layer, the ionized layer and the like is directly utilized, the cycle slip detection and recovery can be precisely carried out.

The invention provides a satellite positioning carrier phase difference method, which comprises the following steps of: acquiring the non-differential error correction number of the carrier phase observed value of each satellite of each reference station by utilizing the observed data of a reference station network; calculating to obtain the error correction number of the non-differential carrier phase observed value of each satellite at a user station according to the non-differential error correction number of the carrier phase observed value of each satellite at the selected reference station, wherein the non-differential error correction number of each satellite includes various observation error influences and ambiguity information of the carrier phase observed value; and carrying out the high-precision carrier phase positioning of the user station by utilizing the error correction number of the non-differential carrier phase observed value of each satellite at the user station.

A motor controller of the sort having both a transformation function for transforming three-phase feedback information into two components, and then changing an error signal for each of the two components back into three-phase correction numbers is provided with an ARCTAN correction function. The ARCTAN correction function takes in the time derivative of the changing angular position of the motor rotor, and creates a correction factor that is supplied back to the transformation function for changing the two error signals back into three. By supplying this correction ARCTAN function, the control eliminates a disturbance that may have occurred in the prior art at higher frequencies wherein both of the control loops for the two components needed to come into play to correct an error on either of the two loops.

The invention relates to the field of satellite navigation, and discloses a broadcast type VRS positioning method and system. Correction number interpolation is performed on the handbook end of a user so that the computing burden of a server can be greatly reduced and the problem that the concurrent user volume is limited by the computing burden can be solved; the user end and a computing center adopt a one-way communication mechanism so that the position security of the user end can be enhanced; the whole CORS is subdivided through the mode of grid division, and the correction number interpolation coefficient of each sub-grid is generated according to a grid solving unit so that the regional difference of the atmospheric condition of wide range of the CORS grid can be reflected, the accuracy and the reliability can be guaranteed and the broadcast volume of the data can also be reduced; and use of high dynamic users is supported.

The invention provides a single-base-station long-distance offshore real-time dynamic positioning method. A short message function of a Beidou navigation system is sued to transmit a simplified differential correction number, the difficulty that offshore communication is inconvenient or even there is no communication offshore is overcome, different observation values in different frequencies of Bedou and GPS satellite navigation systems are utilized to develop a stable, rapid and accurate flowing-end real-time positioning algorithm aimed at the special offshore environment, correction number play software of a corresponding reference station and real-time moving station positioning software are realized, and a single-base-station based long-distance offshore real-time dynamic positioning system is established.

The invention discloses an error-separation-mode-based regional pseudo-range differential enhanced positioning method of a global navigation satellite system (GNSS). The method comprises: for regional pseudo-range differential enhanced positioning of a GNSS, n reference stations and a terminal user are employed; a receiver of any reference station r receives observation data of a satellite s, and after processing, an error vector correction number of the satellite s on the reference station r is obtained; each reference station sends the obtained error vector correction number of the satellite s to the terminal user, distance weighted mean processing is carried out on a frequency relevant item error correction number of each reference station according to a base line distance between the reference station and the terminal user, and then the processed number adds to a frequency non-relevant item error correction number of one reference number to obtain a total error correction number; and then a pseudo-range measurement value adds to the total error correction number to obtain a corrected user pseudo range and then calculation is carried out according to a standard pseudo-range single-point positioning way so as to obtain a user position after error correction. With the method, the positioning performance of the single-frequency satellite navigation can be improved.

The invention, which relates to the field of satellite positioning, provides a wide-area differential positioning method, apparatus, and terminal, and a computer-readable storage medium. The method comprises: a differential positioning request sent by a user terminal is received, wherein the differential positioning request carries initial positioning information of the user terminal and feature information corresponding to a data format that can be received by a receiver of the user terminal; a wide-area differential correction number meeting a preset condition is obtained from a database; and according to the initial positioning information and the wide-area differential correction number meeting the preset condition, a positioning correction number of the user terminal is calculated, wherein the format of the positioning correction number corresponds to the feature information. Because the positioning correction number that can be received by the receiver of the user terminal is calculated based on the initial positioning information and the wide-area differential correction number, the user terminal is able to carry out positioning accurately by using the positioning correctionnumber without any modification on the user terminal, so that the positioning accuracy of the user terminal is improved with low costs.

The invention discloses a precise positioning method through combination of a single-frequency GPS and GLONASS and a device thereof. The method includes: establishing a base station and a mobile station, wherein a positioning module includes a single-frequency GPS chip and a single-frequency GLONASS chip. The base station and the mobile station reading broadcast ephemerises output by positioning modules of the base station and the mobile station respectively; the base station and the mobile station carrying out time synchronization on a GLONASS and a GPS respectively; the base station and the mobile station calculating satellite positions of the GPS and the GLONASS respectively according to the ephemerises of the positioning modules of the base station and the mobile station; the mobile station and the base station reading original pseudo-range data respectively; the base station calculating a pseudo-range difference correction number of the base station according to the position of the base station, the acquired satellite positions of the GPS and the read GLONASS and the read original pseudo-range data output by the GPS and the GLONASS chip; and the mobile station calculating a positioning result through adoption of a Kalman filtering method according to the acquired satellite positions, read original pseudo-range phase data output by the GPS and the GLONASS chips and the pseudo-range difference correction number obtained from the base station. Therefore, calculation is stable and positioning is accurate.

The invention provides a multi-mode GNSS single-frequency cycle slip detecting and repairing method supporting RTPPP and RTK. The method comprises: an inter-epoch difference is constructed; a time-dependent ionized layer error, a tropospheric error and clock correction delay errors between different systems are eliminated; overall least squares estimation is carried out; if a position correction number covariance DX^X^ is larger than or equal to threshold 1, five satellites are selected circularly and a cycle-slip-free combination with the highest reliability is found out to obtain position and clock difference drift correction number; a new residual vector is obtained by back calculation, wherein the residual vector is an inter-epoch cycle slip floating point solution; and the cycle slipfloating point solution is processed by rounding off in an acceptable range to determine whether the cycle slip can be restored or be a gross error. According to the invention, three different empirical thresholds are set based on different detection quantity meanings, so that the probability of missed determination and false determination during the cycle slip restoring process can be reduced.

Disclosed are a satellite positioning method and a satellite positioning system. The system includes satellites, a base station, and an observation station. A monitoring terminal and a correction parameter information generation device are arranged at the observation station. The monitoring terminal receives observation data transmitted from the satellites. The correction parameter information generation device generates correction parameters based on the observation data, and the correction parameters are sent to the base station. The base station is provided with a switch and a message parameter overlay, coding and broadcasting device. The switch receives basic navigation messages from the satellites. The message parameter overlay, coding and broadcasting device programs the correction parameters through protocol overlay to the basic navigation messages, and sets the broadcasting of an integrated code message that incorporates the correction parameters. The code message is sent fromthe switch to the satellites through an uplink injection link. The satellites broadcast the integrated code message received from the base station. The correction parameters include one or more of thesub-region comprehensive correction number, the satellite orbit correction number, the satellite clock correction number, and the ionosphere correction number.

The invention provides a satellite positioning method and device based on a B2b signal of a Beidou No.3 satellite. The method comprises a step of obtaining original observation data broadcasted by theBeidou No.3 satellite and various correction numbers carried in a broadcasted B2b signal, a step of calculating the orbital and clock-correction numbers of a current time by using orbital and clock-correction numbers of multiple historical broadcasting times, a step of determining a satellite precise orbit and a satellite precise clock correction of the current time according to a broadcast ephemeris and the orbital and clock-correction numbers of the current time, a step of correcting pseudo-range observation values of different frequencies according to an inter-code deviation correction number, and a step of determining the position of equipment to be positioned at the current time according to the satellite precise orbit and the satellite precise clock correction and the corrected pseudo-range observation values. According to the invention, the orbital and clock-correction numbers of the current time are determined by using the correction data of multiple historical broadcast times, the influence of the mismatch of the current time and a play time on the precise orbit and the precise clock correction is weakened, and the high-precision real-time precise positioning is achieved.

The invention discloses a distance-constrained photogrammetric high-precision target positioning method. The method comprises the following steps of: the step 1, calibrating parameters in a camera; the step 2, shooting a target image containing an indium steel ruler; the step 3, measuring coordinates of the target point image; the step 4, calculating the three-dimensional coordinate of the target point by adopting a least square method, and taking the three-dimensional coordinate as the initial value of the physical coordinate of the target point; the step 5, acquiring initial values of elements of the external orientation of the image; the step 6, calculating the net adjustment of the distance constraint; and the step 7, performing adjustment iteration convergence determination, determining the correction number calculated each time until the difference limiting requirement is met, and obtaining the high-precision coordinate of the target point. The method does not need to independently arrange control points, can obtain millimeter-level target point location precision, is simple and quick, reduces operation time, has high measurement speed, and greatly improves measurement operation efficiency.

The invention relates to a Beidou / GPS dual-mode navigation positioning device and method, and the method comprises the steps: receiving a Beidou / GPS satellite signal, and reading satellite data; analyzing and calculating the satellite data, obtaining a first Beidou / GPS difference correction number, and storing the first Beidou / GPS difference correction number at a reference station; receiving a Beidou / GPS satellite signal and reading the satellite data; carrying out the analyzing and calculation of the satellite data, and obtaining a second Beidou / GPS difference correction number; carrying out the matching and correction of the first and second Beidou / GPS difference correction numbers, obtaining a corrected Beidou / GPS difference correction number, carrying out the position analysis, and carrying out the dual-mode positioning; and enabling an airborne moving station to carry out the continuous positioning. Compared with the prior art, the method can improve the positioning speed and precision. The method also can achieve the continuous positioning under the condition of no satellite signal, and improves the positioning precision.

The invention relates to a method for realizing positioning based on a Beidou short message transmission differential signal. The method is provided in order to improve the applicability of satellite differential positioning, and is used to perform differential positioning in an area with neither network base station nor mobile communication base station. The method comprises the following steps: a reference station terminal gets a differential correction number according to a received satellite signal and the coordinate of a reference station, and stores the differential correction number in an internal memory of the reference station terminal; a moving station terminal generates a differential data request including differential start time and differential frequency, and sends the differential data request to the reference station terminal; the reference station terminal sends corresponding differential data to a reference station coding module after receiving the differential data request sent by the moving station terminal; the reference station terminal sends a single piece of differential data information through a Beidou short message, and multiple cards send differential data information in turn to meet the requirement of the moving station terminal for positioning frequency; and the moving station terminal receives differential data of multiple epochs, uses the data to fit a pseudo-range differential correction number through Chebyshev polynomial interpolation, and uses a correction number obtained by extrapolation to perform differential positioning.

The invention provides a GNSS system integrity evaluation method and a GNSS system integrity evaluation device. The GNSS system integrity evaluation method comprises the steps of: acquiring observation data of a navigation receiver; performing gross error detection on the observation data, and generating a correction number; evaluating an abnormity when a gross error detection result indicates a residual error abnormity; carrying out error evaluation according to the correction number when the abnormity threatens the integrity; and calculating and outputting a hazard misleading information probability HMI, and sending out an alarm. The GNSS system integrity evaluation method provided by the invention can be used for evaluating integrity of GNSS comprehensively and accurately, acquiring the operation state of the GNSS system in time, carrying out fault isolation and repair in time, and improving the accuracy and stability of the GNSS system.

The present application relates to a positioning method and device, a computer device and a storage medium. The method includes the steps of: when signal interruption with a reference station is detected, acquiring the current observed data received by a mobile station in a current epoch, the historical observed data received by the mobile station in a neighboring historical epoch, and the correction number of a stationary orbit satellite; subjecting the neighboring historical coordinate position, the current observed data, the historical observed data, and the correction number to differential single-point positioning process to obtain the current position of the mobile station. The positioning method provided by the present application can achieve accurate positioning in the case of signal interruption.

The invention provides an analog-to-digital converter (ADC). The ADC comprises a plurality of stages connected in series, a gain error correction module, and a look-ahead module. Each of the stages derives a stage output value from a stage input signal and generates a stage output signal as the stage input signal of a subsequent stage, wherein one of the stages is selected as a target stage for estimating a gain value thereof. The gain error correction module delivers a correction number to the target stage to affect the stage output signal of the target stage and the stage output values of subsequent stages of the target stage, receives at least one auxiliary output value from a look-ahead module dedicated to the target stage, and derives an error estimate of the gain value of the target stage from the stage output values and the auxiliary output value. The look-ahead module generates the auxiliary output value according to the stage output value of the target stage, wherein the auxiliary output value is not affected by the correction number.

The invention discloses a post-event ultra-fast RTK positioning algorithm based on GPS, GLONASS and BDS multiple systems. Firstly, a wide lane ambiguity between reference stations of GPS, GLONASS andBDS is respectively solved by adopting a Melbourne-Wubbena combination, and then ionospheric delay between the reference stations is eliminated by adopting a method without ionospheric delay combination. Double-difference ambiguity float solution and covariance of L1 frequency point can be recovered by using float solution and covariance of fixed wide lane ambiguity and ionosphere-free combined ambiguity, and double-difference integer ambiguity is resovled to calculate atmospheric error, and then atmospheric error interpolation is carried out to generate correction number. GNSS real-time cycleslip detection is carried out, tropospheric errors are corrected, and finally a Kalman filtering parameter estimation method is used to complete new state estimation. The invention is advantageous inthat the high-precision positioning service of CORS can be realized by completing the resolution of the integer ambiguity among the base stations, the extraction of the atmospheric error, the error interpolation, the correction generation, the real-time cycle slip processing, the elimination of the ionospheric delay and the optimization of the tropospheric model, and the algorithm provided by theinvention is convenient for surveying and mapping personnel to obtain stable CORS correction data.

The invention provides an unmanned aerial vehicle multi-frame image self-adaptive positioning and correcting method based on aerial photography attitudes, and belongs to the technical field of remote sensing image processing. The method comprises the main steps that firstly, self-adaptive initialization is carried out, wherein different initialization strategies are used for different sources of multi-frame images, and different initial values are selected for different flight attitudes; secondly, the number of correspondingly required homonymy points is determined according to the number of input image frames; thirdly, an error equation is established by utilizing constraint conditions between the images by utilizing the bundle adjustment method, all the homonymy points of each image are traversed, and a normal equation is established; fourthly, a correction number is added to an approximate value to serve as a new approximate value for iteration till the correction number is smaller than a limit value, and the correction number is output. Error correction is conducted on the acquired images with the common region accurately in real time in the online aerial photography process of an unmanned aerial vehicle, and the accuracy of a positioning result is improved.

The invention discloses a compensation elevation plane or mean elevation plane-based 3-degree zoning coordinate conversion system. By research on a geodetic coordinate change law of a control point ona reference ellipsoid, a compensation elevation plane or a testing zone and a mean elevation plane of a city, a calculation method for a semi-major axis of a new ellipsoid after adoption of the compensation elevation plane or the testing zone and the mean elevation plane of the city, a calculation method for a geodetic latitude correction number and new geodetic latitude of the ground control point, and a calculation method for calculating direct and inverse computation parameters by taking the compensation elevation plane or the testing zone, the mean elevation plane of the city, the semi-major axis of the ellipsoid and first eccentricity as arguments are derived. Compared with the prior art, the control point is transferred to the compensation elevation plane or the testing zone and themean elevation plane of the city from the CGCS2000 ellipsoid according to calculation formulae for the direct and inverse computation parameters; high-precision coordinate conversion of geodetic coordinates and plane coordinates can be realized; and a conversion mode is also suitable for a 1980 Xi an coordinate system, a 1954 Beijing coordinate system and local independent coordinate systems.

The present invention discloses a position correction method based on a CORS (Continuously Operating Reference Station), a positioning terminal and a positioning system. The position correction methodcomprises the following steps of: the step 1: establishing an irregular grid model: performing mutual connection of each three nearest CORSs to form one triangle, and forming an irregular grid modelby employing the plurality of triangles; and the step 2: matching a corresponding triangle according to outline coordinates (x, y, z) provided by a position service request terminal, namely determining that which three CORSs form the triangle where the position service request terminal is located, calculating coordinate correction numbers ([Alpha]m, [Beta]m, [Gamma]m) according to the coordinate difference of the three CORSs at a corresponding moment, and finally obtaining a corrected position coordinate value (x+[Alpha]m, y+[Beta]m, z+[Gamma]m) of the position service request terminal. The position correction method based on CORS, the positioning terminal and the positioning system can substantially improve the positioning precision and are easy to carry out.

The invention provides a free station setting method based on overall disc position measurement, aiming at effectively improving the elevation station setting precision and meeting free station setting requirements so as to improve the station setting efficiency and the station setting stability. The free station setting method comprises the following steps: (1) selecting a proper position; erecting a total station and then leveling; (2) manually aiming at two back-sight points and then carrying out the overall disc position measurement on the back-sight points needing to be observed; (3) calculating a direction value, a distance, a vertical angle and a vertical disc index error; then carrying out three-dimensional compensating computation to obtain coordinates, precision and coordinate azimuth angles of station setting points; (4) carrying out constant weight iterative computation again according to a correction number until weight is not changed any more; outputting the coordinates,the precision and the coordinate azimuth angles of the station setting points, which are obtained by the three-dimensional compensating computation, of the station setting points; and (5) after the station setting is finished, carrying out vertical disc index error correction when a front-sight point is measured through a single disc position and then calculating a three-dimensional coordinate ofthe point.

The invention belongs to the satellite navigation field and provides a DGNSS satellite orbit deviation correction method. The method includes the following steps that: broadcast ephemeris and precise prediction ephemeris are utilized to calculate double-difference station-satellite geometric distances; a double-difference orbit correction number of a mobile station and a reference station is calculated according to the double-difference station-satellite geometric distances; an orbit error is corrected according to the double-difference orbit correction number. With the DGNSS satellite orbit deviation correction method adopted, the separation of the orbit error from other distance related errors such as tropospheric and ionospheric delay errors can be realized, and the quality of the orbit deviation correction number can be monitored and controlled more effectively; and correction accuracy and stability are significantly improved. The method has a wider application range. The DGNSS satellite orbit deviation correction method can satisfy the requirements of the correction of orbits of baselines of different lengths such as medium-short baselines, medium-long baselines and ultra-long baselines.

The invention provides a method of gain error calibration in a pipelined analog-to-digital converter (ADC). In one embodiment, a first stage and a second stage of the pipelined ADC share a common operational amplifier. The first stage is requested to generate the stage output signal thereof according to a first correction number. The second stage is also requested to generate the stage output signal thereof according to a second correction number. A plurality of stage output values generated by stages of the pipelined ADC are collected. The stage output values are respectively correlated with the first correction number and the second correction number to estimate a first gain error estimate of the first stage and a second gain error estimate of the second stage. The first gain error estimate and the second gain error estimate are weighted to obtain a predicted gain error for gain error calibration in the first stage and the second stage.

The invention discloses an orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image, which adopts a projective mode of double centre line projection to describe the geometrical deformation law of a linear array push-scan asynchronous-sampling satellite image; by recovering all parameters of the double centre line projection, the relationship between pixel coordinates of the satellite image and corresponding ground coordinates is established, thus realizing the orthorectification based on geometric model of linear array push-scan asynchronous-sampling satellite image; the method comprises the following steps of: (1) determining initial value of model parameters of the double centre line projection; (2) calculating error equation coefficients and resolving correction numbers of model parameters; (3) calculating a range outputting orthorectific image; (4) calculating the interpolating calculation of the gray value of grid points of the orthorectific image.

The invention discloses a high-frequency epoch-by-epoch phase difference method for single-frequency GNSS phase stability monitoring, comprising the following steps: using a single-frequency GNSS receiver to perform high-frequency observation on a station point, and calculating the phase difference between adjacent epochs; using the least squares method to detect a station 3D (NEU) coordinate correction number time series within the interval of adjacent epochs under continuous epochs; getting the mean and standard deviation of the NEU coordinate through statistical analysis of the time series; and calculating the anomaly ratio. The phase observation stability of the single-frequency GNSS receiver is evaluated by calculating the continuous observation anomaly ratio using the method. Single-point real-time high-frequency GNSS phase data quality monitoring is carried out based on single-frequency GNSS data. The GNSS phase stability can be evaluated without the need for high-precision clock difference or model correction.