532results about How to "Improve the accuracy of use" patented technology

The invention discloses an autonomous navigation system positioning method based on strapdown inertial navigation resolving and zero-speed correction. According to the autonomous navigation system positioning method, output data of an MEMS (Micro-electromechanical Systems) accelerometer and an MEMS magnetometer in a pedestrian autonomous navigation system is used for carrying out initial alignment on the system; a strapdown inertial navigation resolving algorithm is used for estimating the state of the pedestrian autonomous navigation system; when a static detecting algorithm detects that pedestrian footsteps are stopped, a zero-speed correction error compensator based on Kalman filtering is designed and a navigation resolving result of the pedestrian autonomous navigation system is corrected by adopting a manner of outputting correction; the defects that an MEMS inertia measurement device is low in precision and has a great positioning error when being used for long time are overcome; a high-precision positioning function of the pedestrian autonomous navigation system is realized under the condition of not increasing external cost. The autonomous navigation system positioning method is simple and high in stability and reliability; the use precision of a single-pawn autonomous navigation system is improved effectively; the autonomous navigation system positioning method has important meanings of realizing autonomous pedestrian navigation and positioning with the high positioning precision.

The invention relates to an on-line double-sided automatic thickness measuring device of organic glass, which mainly comprises a control system, a machine frame, a support frame, a detection frame, a cross beam, a cross beam regulator, a feeding distance measuring device and a plurality of thickness measuring devices, wherein the upper end of the machine frame is fixedly connected with the detection frame, the cross beam is connected onto the upper edge frame of the detection frame through the cross beam regulator, the inside of the detection frame is fixedly connected with the support frame, a plurality of support guide shafts are arranged on the support frame, a feeding speed measuring device is arranged at one end of any support guide shaft for measuring the feeding distance of an organic glass plate, the thickness measuring device comprises upper thickness measuring units and lower thickness measuring units, and a plurality of upper thickness measuring units and lower thickness measuring units are respectively and symmetrically arranged on the cross beam and the detection frame for detecting the thickness information of the front side and the back side of multi-point positions of the organic glass plate. Because the control system is used for processing and calculating the position information of entity space three-dimensional lattices of the organic glass in real time for confirming the dimension quality of the plates, the on-line double-sided automatic thickness measuring device has the advantage of simple and compact structure, and can be directly arranged at a production line for real-time measurement.

The invention provides a method for accurately calibrating temperature error coefficients of a laser gyro inertia measurement unit. In the method, a three-axle table with a thermostate is utilized to enable an LIMU to achieve whole thermal balance through a measure of performing long-term heat preservation at a certain temperature spot; system inherent error coefficients such as a gyro scale factor, a gyro literal drift, an accelerometer scale factor, an accelerometer literal bias and the like at the temperature spot are accurately calibrated through a calibration method of combining dynamic rotation and static 24 position; and then high and low temperature cycling tests are performed on the LIMU by utilizing the inherent error coefficients of the LIMU at the temperature spot, so that the temperature error coefficients comprising 30 temperature related coefficients such as a primary temperature coefficient, a secondary temperature coefficient, a temperature gradient coefficient and a temperature change rate coefficient of the gyro literal drift and accelerometer literal bias are further calibrated. The method provided by the invention has the characteristics of high accuracy and simplicity in operation, and can be used for greatly improving the use accuracy of the LIMU under a variable temperature environment.

The invention discloses a pedestrian autonomous navigation calculation algorithm based on an MEMS-IMU. Two IMU systems are simultaneously and fixedly connected with the two feet of the user of a pedestrian navigation system; the two systems respectively perform a strapdown inertial navigation calculation algorithm and a zero-speed correcting algorithm on the basis of Kalman filtering, and then the positioning information of the two feet is fused; when the calculation distance between two feet exceeds the largest step size gamma between the two feet, inequality constraint is performed on navigation results of two IMUs by adopting a state constraint Kalman filtering algorithm, so that vague human physiological property problem is converted into a rigid mathematical problem, the optimal estimation of navigation results is achieved, and pedestrian navigational positioning function with higher accuracy is achieved.

The invention discloses a method of a micro combined multi-sensor navigation system with quick outfield calibration, and the micro combined multi-sensor navigation system of the method comprises a two-dimensional obliquity sensor, a micro magnetic compass, three silicon MEMS gyros and three silicon MEMS accelerometers. In order to improve the use precision of the micro combined multi-sensor navigation system, the method of the invention discloses that the instant quick outfield calibration is implemented on the micro combined multi-sensor navigation system before use; wherein, the two-dimensional obliquity sensor provides a calibration horizontal benchmark, the micro magnetic compass provides a calibration azimuth benchmark, the three silicon MEMS gyros and the three silicon MEMS accelerometers measure the output of angular velocity and accelerated velocity, and seven core error coefficients of the micro combined multi-sensor navigation system are calibrated in a data post-processing. The method of the micro combined multi-sensor navigation system with quick outfield calibration is simple, convenient and efficient, overcomes the defect that the repetitiveness of each starting of the micro combined multi-sensor navigation system is bad, directly improves the precision of each use, and avoids the inconvenience that is caused by the dependence of traditional calibration methods on special high-precision laboratory equipment.

The invention relates to a low temperature air supply air conditioner device for naval vessels and a control method thereof. The low temperature air supply air conditioner device comprises an air conditioner, a fresh and return air mixing box which is provided with a primary return air port and a fresh air port, and a PLC control system. The primary return air port is provided with a primary return air valve and a first temperature and humidity sensor; the fresh air is provided with a fresh air valve; the air conditioner is provided wit a secondary return air port; the secondary return air port is provided with a secondary return air valve and a second temperature and humidity sensor; an exhaust box of the air conditioner is provided with a third temperature and humidity sensor; and the first return air valve, the second return air valve, the first temperature and humidity sensor, the second temperature and humidity sensor, the third temperature and humidity sensor and the fresh air valve are all connected with the PLC control system. In the invention, the shell of the air conditioner is provided with a primary air port, the secondary return air port and the fresh air port; a plurality of temperature and humidity sensors are matched with a plurality of air valves to ensure the low temperature air supplying and the temperature control accuracy, exactly control the water supply temperature and effectively control air supply condensation. The device is simple and compact in structure, high in service accuracy of low temperature air, and high in safety. The device is fit for naval vessels and submarines and the like.

The invention discloses a polymer dielectric medium with low dielectric constant and low loss and a preparation method of the polymer dielectric medium. The polymer dielectric medium comprises the following raw materials: 50-60% of epoxy resin system, and 40-50% of mixed boron nitride nanoparticles, wherein the mixed boron nitride nanoparticle is a mixture of a boron nitride nanotube and a boron nitride nanotube; the epoxy resin system is formed by 100phr of epoxy resin E-51, 85phr of methyl hexahydrophthalic anhydride and 1phr of benzyl dimethylamine in a mixing manner. The thermal breakdown voltage of the polymer dielectric medium is significantly improved by the polymer dielectric material with high heat conductivity and high electric breakdown, the service life is prolonged, the dielectric constant and loss and the heat expansion coefficient are reduced, the mechanical strength and the tenacity are improved, the highest heat conductivity can be up to 5.26W / mK, the volume resistivity is about 1014ohm.cm, the thermal breakdown voltage is about 2-3kV / mm higher than that of the similar heat-conducting polymer dielectric medium, and the dielectric constant and the loss are a little lower than those of pure resin.

The invention discloses a triaxial integrated optical fiber gyroscope inert measurement device based on optical source cold standby, and a compensation and installation method. The triaxial integrated optical fiber gyroscope inert measurement device comprises a body, two triaxial shared optical sources, an optical source driving and refrigerating circuit, three framework-free optical fiber loop meter heads, three optical fiber gyroscope signal processing and interference circuit digital boards, a system signal processing and interface circuit digital plate, a secondary power supply module, a frequency and voltage conversion simulation circuit, three electric connectors and a reference mirror. The three optical fiber loops share an optical source, and a standby cold optical source is provided, thus the reliability is high; the installation error correction method used by the invention can effectively reduce the triaxial cross coupling; the circuit boards are installed on a lateral cover and an upper cover for the convenience of radiation protection design; meanwhile, the favorable heat radiation is realized; framework-free optical fiber loops are used, the adaptability of a magnetic environment and a radiation environment is improved.

The invention provides a magnetic flourescent nano material for a magnetic-photo sensor and a preparation method thereof. The material is a magnetic flourescent nano material based on nano tubes or nano-fiber micro templates and comprises a tubular or fibroid nano material template with a carboxylic acid functional group, a magnetic material, a biparental molecular material and a quantum dot material. The functional group of the template is chelated with Fe<2+>, Fe<3+>, or Co<2+>; the magnetic material such as Fe2O3, Fe3O4, or FeCo generated after reaction under the action of alkali grows on the surface of the template; the biparental molecule is gelatin, amino acid, polypeptide, or dendroid with a carboxylic end group, one end of which contains carboxyl and the other end contains amino or sulfydryl; the carboxyl of polyamide-amine which is a dendroid molecule is chelated with Fe2O3, Fe3O4, or FeCo nano grains on the template; the amino or the sulfydryl is combined with the quantum dot to obtain the megnetic flourescent nano material through assembling. The nano material has strong magnetic property, high quantum yield and good electrical property. After applied to the preparation of magnetic-photo sensors, the nano material can improve the accuracy and the sensitivity of the magnetic-photo sensors.

An astatic multi-position high-accuracy calibrating method of inertia measurement unit can accurately calibrate out 33 error coefficients in 7 types such as gyroscope scale factor gyroscope erection error, accelerometer scale error, etc by making IMU rotate at six position with 12 times of rotation under condition that accurate rotary platform is not pointed at north.

The invention discloses a field calibration method of an optical fiber strapdown inertial navigation system based on Kalman filtering, belonging to the technical field of inertia. The method comprises the steps that an optical fiber strapdown inertial navigation system is installed on a fixed device by a tool, is electrified for preheating, and is aligned statically and initially, and then, the fixed device is turned manually so as to turn over sequentially for 12 times; each position is static for 3-5 minutes before and after turnover, and Kalman filtering correction is carried out; an optical fiber gyroscope and output of an accelerometer of the optical fiber strapdown inertial navigation system are subjected to error compensation according to the inertial device error parameter estimation value obtained after the Kalman filtering correction for the last time is finished. The fixed device is preferably regular hexahedron. The method disclosed by the invention can be used for calibrating 21 error parameters of the optical fiber strapdown inertial navigation system on the field, overcomes the calibration defects of a traditional laboratory, and improves the actual using precision of the system.

This is a live demarcating method for the fiber optic gyro inertial measurement Unit. This invention relates to a live demarcating method of the error coefficient of the fiber optic gyro inertial measurement Unit. This method can accurately demarcate 15 error coefficients such as the gyro calibration factor, normal value drift, erection error and the normal value bias through FIMU 12 whirl at six different positions without accurate rotating floor. This invention has such merits as high accuracy, simple operation which not only improves the working accuracy of FIMU but also improves the set efficiency.

The invention discloses a dust removing system for a fully-mechanized coal mining workface. The system includes a dust control system installed on one side of a roadheader, a dust suction system and a dust collecting system installed on the other side of the roadheader, wherein the dust control system comprises a press-in type fan, a press-in type air duct and a wall-attached air duct which are connected with each other in turns; the dust suction system comprises a first suction hood for sucking dust on the cutting head position of the roadheader, a second suction hood for sucking dust on the insertion board position of the roadheader, a third suction hood for sucking dust on the break-of-bulk-point position of a scraper conveyor and belt conveyor, a dust suction air duct and a suction hood assembly box, and the first suction hood, the second suction hood, the third suction hood and the dust suction air duct are all connected to the suction hood assembly box; the dust collecting system comprises an extraction type air duct, a dust remover and an extraction type fan which are connected with each other in turns, and the extraction type air duct is connected to the suction hood assembly box. The dust removing system for the fully-mechanized coal mining workface can effectively control diffusing and spreading of dust in underground roadways, has a good dust suction effect and high dust collecting efficiency, and can greatly reduce the dust concentration of the fully-mechanized coal mining workface.

The invention provides a photosensitive drum drive assembly, a photosensitive drum having the drive assembly and a processing cartridge. The photosensitive drum drive assembly comprises a gear capable of being tightly mounted on one end of a drum body, and an axial adjusting assembly capable of making reciprocating movement relative to the gear along the axial direction of the gear, wherein the axial adjusting assembly includes a driving force receiving head capable of being matched with a driving force output head, a driving lever and a shift pin; one end of the driving lever is inserted into the gear along the axial direction; the driving force receiving head is fixed on the outer end of the driving lever and is located outside the gear; the shift pin is fixed on a portion of the driving lever located in the gear; and a stop section capable of being matched with the shift pin to prevent the driving lever from rotating relative to the gear is arranged in the gear. According to the invention, the service life of a motor, a motor transmission gear and the driving force output head of an imaging apparatus can be prolonged, and the use accuracy and the service life of the inner surface of a round hole on the sidewall of the processing cartridge and the outer surface of a shaft of the photosensitive drum drive assembly can be improved.

The invention provides a calibration method of a laser strapdown inertial navigation system on a horizontal three-axis rotary table, and belongs to the field of inertial instrument testing. The methodcomprises the following steps: firstly, placing a laser strapdown inertial navigation system on a horizontal three-axis turntable for initial alignment; secondly, entering a navigation state after alignment, and performing a biaxial position uniaxial speed rolling method by using a horizontal three-axis turntable; and finally, standing for 10 seconds and recording a navigation output speed errorafter the completion of each rotation; then, carrying out quadratic polynomial fitting on the speed error recorded each time with respect to navigation time to obtain an observed quantity, and identifying 21 error parameters of scale factors, zero offset and installation error angles of an accelerometer and a gyroscope in an IMU by using a least square method. Compared with a common calibration method of the IMU, the method not only solves the decoupling problem of the installation error angle in IMU system-level calibration, but also effectively inhibits the influence of the error of the inertial navigation test equipment on the calibration precision of the IMU, and can calibrate the IMU error parameter with higher precision without providing accurate attitude information by a rotary table.

A three-frame four-axis inertial platform error calibration method based on a navigation datum system comprises the following steps: with an X accelerometer input shaft as a datum axis, establishing a datum coordinate system OXYZ calibrated by a platform system; based on the datum coordinate system, establishing a platform system accelerometer output error model including an accelerometer installation error, a gyroscope drift error model and a frame angle output error model; and then according to the above three models, completing a calibration work of a three-frame four-axis inertial platform. Relying on a high-precision accelerometer on the platform, the navigation method is adopted to achieve self-calibration, and thus the calibration method is greatly simplified, the calibration cost is reduced, and the calibration accuracy is improved.

The invention belongs to the technical field of spinning forming, and discloses a multi-pass spinning forming method for a long barrel with inner annular reinforcing ribs. An inner spinning technologyand a tension spinning technology are combined, only a set of annular core dies with different inner diameter sizes and the length being 400 mm are adopted to achieve multi-die multi-pass spinning forming of the long barrel part with the multiple inner annular reinforcing ribs and the length being 2m or less, and the part reinforcing rib position and size precision can be ensured. The method comprises the steps of spinning workblank design, spinning workblank machining, stress relief treatment, workblank installation adjusting, multi-pass spinning, turning, stress relief treatment and the like. Multi-pass low-cost forming of the long barrel with the inner annular reinforcing ribs is achieved, and the material utilization rate is greatly improved; and compared with a traditional technology, the technological risk and the difficulty of multi-pass accurate forming of the inner annular reinforcing ribs are lowered, the material cost is reduced, and the product quality is improved.

The invention discloses an edging device and method based on visual control. A conveying unit is used for conveying to-be-edged workpieces; image acquisition modules of visual control units are used for acquiring image data of the to-be-edged workpieces and send the image data to an image processing module, and the image processing module acquires contour features reflecting edges of the workpieces on the basis of the image data and acquires G codes for processing by a numerical control system according to the contour features; and finally, edging units are used for edging the to-be-edged workpieces efficiently according to the G codes under control of the control system. The edging device and method adopt the visual control manner so that edges of tableware trays are ground automatically, the visual control units and the edging units located at different stations are used for realizing high-precision acquisition of tableware contour images and high-precision grinding of the tableware edges, and the edging device and method have the advantages of high edging precision, high efficiency, easy operation, convenient maintenance and the like.

The invention belongs to the technical field of automatic processing, and in particular relates to a material basket type automatic feeding and discharging machine tool positioned outside a machine. The material basket type automatic feeding and discharging machine tool positioned outside the machine consists of a processing area, a feeding area, a discharging area and a carrying mechanical arm; the feeding area and the discharging area are positioned on the left side and the right side of the processing area correspondingly, and are isolated through an automatic protective door and the processing area; the feeding area comprises a feeding basket, a feeding carrying device and an automatic positioning device; the feeding basket is positioned in front of the automatic positioning device; the feeding carrying device can move back and forth between the feeding basket and the automatic positioning device; and the carrying mechanical arm is arranged above the feeding area, the processing area and the discharging area through a truss, and can move left and right between the discharging area and the discharging area along the truss. Automatic feeding and discharging preparation and processing are completely separately and do not interfere with each other, and workpiece positioning and machine tool machining can be conducted simultaneously, so that the production efficiency is greatly improved; the internal structure of the machine tool is simple and convenient to observe, and the fact that a positioning jig is not damaged by cutting liquid can be guaranteed, so the service life is prolonged and the precision retentivity is improved.

The invention relates to a combined device for improving working precision of a comma scraper similar to a fine macroaxis. Two ends of an axis head of the comma scraper are supported by a bracket respectively; two ends of the axis head of the comma scraper positioned in the opposite inner sides of the two brackets are respectively and fixedly provided with a supporting arm vertical to the scraper axis; two supporting arms are provided with an auxiliary axis which has axial displacement along the scraper axis and is locked in the supporting arm; and a different position of the auxiliary axis is locked in the supporting arm to generate axial load with different sizes and directions on the supporting arm. The combined device can accurately and rapidly adjust tightening torques of nuts at two ends of the auxiliary axis according to the weight and working load born by the scraper, generates preset axial load, adds the needed torque to the comma scraper to balance bending moment which is generated by the weight and the working load born by the comma scraper or the fine macroaxis, removes the bending deformation generated by the weight and the working load and ensures that the edge linearity of the high-precision scraper still keeps high service precision in a working state.

The invention provides a method and a device for estimating line-of-sight angle zero error by using an active radar seeker. The method comprises the steps of: calculating inertial navigation accordingto signals collected in real time by an inertial measurement unit in strap-down inertial navigation system to obtain flight path information of a missile in the strap-down inertial navigation system;in a case that every preset time is a sampling point, collecting beam signals during the search, interception and tracking of a target point by the active radar seeker, and calculating a first ballistic target line-of-sight angle of the missile relative to the target point in real time; collecting output data of a gyro and an accelerometer in the inertial measurement unit at each sampling point,and calculating a second ballistic target line-of-sight angle of the missile relative to the target point in real time according to the strap-down inertial navigation system principle; establishing astate equation, wherein the state variables in the state equation comprises the line-of-sight angle zero error; establishing a observation equation by using the ballistic target line-of-sight angle based on a observed value of the second ballistic target line-of-sight angle as observed quantity; and estimating the line-of-sight angle zero error according to a Kalman filtering method based on the state equation and the observation equation.

An environment-friendly insulating paint with high punching performance for non-oriented electrical steel, and a preparation method and application thereof. The insulating paint comprises 20%-60% of aluminium dihydrogen phosphate, 2%-40% of an organic resin, 0.5%-5% of silica sol, 1%-10% of phosphate, 0.3-2% of nitrate, 1%-5% of magnesium oxide, 0.3%-5.5% of a rare earth salt mixed solution, 0.5%-5.5% of a silane coupling agent and the balance of solvent water. The insulating paint provided by the invention is a single component organic / inorganic waterborne environment-friendly paint, which has characteristics of good surface state, high adhesion, high insulation, high corrosion resistance and high temperature resistance and environment-friendly characteristics of no chrome or harmful ions, and can be widely used in surface coating treatment of cold-rolled non-oriented electrical steel plate. At the same time, the invention greatly improves and increase the smoothness and punching performance by improving the performance and the proportion of the organic resin, so that the insulating paint is comparable to a traditional chromate insulating coating; the insulating paint greatly prolongs the service life of the die and improves the product processing precision, and is in favor of improving production efficiency and reducing the cost.

The invention belongs to the technical field of numerical control machining center tool magazines, and particularly relates to a machining center intelligent tool magazine system and an intelligent tool magazine system operation method. The intelligent tool magazine system is provided with 198 tools, the supply types and quantities of tools are increased, meanwhile, the tools are provided with code blocks for storing tool information, thus, the damaged tools can be identified and can be automatically replaced according to the tool information transmitted by the code blocks, and the tools are replaced intelligently and automatically, and the simultaneous machining demands of different parts is met, the tool replacement time is effectively shortened, and the production efficiency is improved. By adopting the operating method for controlling a control device, a drive device, an induction device and a tool replace device to coordinately operate, the running time can be shortened, the toolsare used reasonably, tool collision is avoided, the service life of the tools is prolonged, the accuracy of the tools is improved, the control device can achieve uniform control, and a built-in toolmagazine and an external tower type tool magazine of the machining center are driven to achieve the motion function.

The invention relates to the field of glass products, in particular to window glass mounted on a traffic facility, and in particular provides laminated glass which is used in match with a laser radaror a near-infrared camera for a vehicle. The laminated glass comprises an outer transparent plate, an inner transparent plate and a thermoplastic membrane, wherein a nano antireflection film is arranged on a first surface and / or a fourth surface; the nano antireflection film is used for increasing the transmittance of the laminated glass within a wavelength range of 900-1000nm; and the laminated glass has at least transmittance of 80% within the wavelength range of 900-1000nm. By adopting the laminated glass, the requirement that energy loss of laser of the laser radar or near-infrared light of the near-infrared camera is less than 20% when the light penetrates through the laminated glass can be met, the power of the laser radar or the near-infrared camera does not need to be greatly increased, normal operation of the laser radar or the near-infrared camera can be ensured, and in addition, the use precision of the laser radar or the near-infrared camera can be improved.

The invention discloses a humidity detection method used for an air conditioner. The humidity detection method includes the following steps that operation modes of the air conditioner and continuous operation time after the air conditioner is started to operate are obtained, and the indoor environment temperature is detected; whether the operation modes of the air conditioner, the continuous operation time and indoor environment temperature meet preset conditions or not are judged; and if the judgment meets the preset conditions, a humidity sensor in the air conditioner is controlled to start to work to detect the relative humidity of the indoor environment. According to the humidity detection method used for the air conditioner, it can be avoided that the humidity sensor is in the working state all the time, and the service life of the humidity sensor can be prolonged. The invention further discloses a humidity detection device used for the air conditioner and the air conditioner with the humidity detection device.

The invention discloses a grinding process of a vibration reducer piston rod. The grinding process comprises the steps of: (1) performing the first rough grinding form a molded piston rod rough blank; (2) quenching the piston rod after the first rough grinding; (3) straightening the quenched piston rod; (4) performing the second rough grinding for the straightened piston rod; (5) performing the finish turning for the piston rod after the second rough grinding; (6) performing the semi-finish grinding for the piston rod after the finish turning; (7) polishing the piston rod after the semi-finish grinding; (8) electroplating the polished piston rod; (9) performing the ultra-finish grinding for the electroplated piston rod; and (10) performing the UB grinding wheel polishing for the piston rod after the ultra-finish grinding. The grinding process can largely improve the surface quality of the vibration reducer piston rod, can prolong the service life of the piston rod, and can improve the use precision of a vibration reducer.

The invention relates to a three-dimensional measurement accelerometer error non-singularity estimation method in an external field environment, in particular to a three-dimensional accelerometer error non-singularity estimation method in a field or an external field environment, wherein no special devices are needed. According to the method, first, all posture information needing to be collected for estimating the error of a three-dimensional accelerometer in an external field is determined; second, an accelerometer error model is built, and unknown parameters needing to be estimated are made to be clear; third, the unknown parameter estimation problem of the three-dimensional accelerometer error model is converted into a fitting problem of geometric model parameters of an ellipsoid; fourth, in parameter estimation of the three-dimensional accelerometer error model, an ellipsoid fitting algorithm avoiding singular points is adopted; fifth, an ellipsoid correcting model is adopted in parameter estimation of the three-dimensional accelerometer error model, and the problem that scale factors and installation error matrixes are not unique is solved. The three-dimensional measurement accelerometer error non-singularity estimation method is applicable to systems such as a small unmanned aerial vehicle, a robot and a handheld terminal with a low-cost, small-size and low-parameter-stability accelerometer as a sensor.

The invention provides a cadastral survey off-line data processing method. Errors are eliminated by sequentially carrying out data preprocessing on inertial survey unit data in field collected data; and the inertial survey unit data with eliminated errors are classified, and the classified data are processed by adopting kalman fixed-interval optimal smoothing, a pure strapdown algorithm and a reverse navigation algorithm respectively, so that various harmful error components in the inertial survey unit data are effectively filtered, and the high-precision positioning information of points to be surveyed in cadastral survey is acquired.