246results about How to "Choose flexible" patented technology

The invention discloses an ultra wide band location method and an ultra band location system in a coal mine well. The method is a banded cell two-step locating method and comprises the following steps of: dividing a plurality of continuously-overlapped banded locating service cells along a roadway; calculating nominal intervals of all reference points; filtering according to received signal strength (RSS) data by an object; measuring and calculating an area coverage in which the object is located; and obtaining the accurate position of the object by a hybrid location method based on cumulative average weighted processing. The system comprises an upper-layer terminal, a data locating server, a ground monitoring terminal, a switchboard, an intrinsically safe gateway, an intrinsically safe wireless relay, an intrinsically safe reference point terminal and an intrinsically safe location terminal. The ultra wide band location method and the ultra wide band location system have strong anti-reference capability, accurate location, a simple structure of system equipment and low power consumption, are more suitable for the roadway working environment, and meet the requirements of the coal mine well for specific operating environment and safety demand.

The invention discloses an external energy-consumption self-resetting bridge pier stud structure system and a realization method thereof, belonging to the field of bridgework. The structure system mainly comprises a bridge pier stud, a bridge abutment, an unbonded prestressed reinforcement, an external energy consumption device, a pier embedded part and a bridge abutment embedded part, wherein the bridge pier stud and the bridge abutment are connected by the unbonded prestressed reinforcement and the external energy consumption device, so that residual deformation can be effectively reduced, and energy consumption can be guaranteed. The external energy-consumption self-resetting bridge pier stud structure system is flexible in design and has specific structure stress. The unbonded prestressed reinforcement on the axis position of the pier stud can be used for generating self-resetting restoring force. The problem that the traditional bridge pier has larger residual deformation and cannot continuously serve after the earthquake loading action is solved. The bridge pier has enough strength and rigidity. The external energy-consumption self-resetting bridge pier stud structure system is realized in a cast-in-situ or prefabricating mode and is easy to construct and is a novel pier stud structure system which is advanced and practical and can realize quick replacement and repair after the earthquake..

The invention relates to an optimal power flow optimization method of distributed power supplies. The optimal power flow optimization method of the distributed power supplies includes the following steps: A, variable in a distribution network is initialized; B, load flow calculation is carried out on the distribution network; C, lines are judged to be overloaded or not, and active output force and reactive output force of an engine and the distributed power supplies are judged to overstep the boundary or not; D, if constraint equations are all met, a step E is continued, otherwise a step F is continued; E, an objective function is judged to be the minimum or not, if the objective function is the minimum, a step J is continued, otherwise a step F is continued; F, net loss correlation coefficients are corrected; G, a Jacobean matrix and a Hessian matrix are calculated; H, a problem of sequential quadratic programming is formed and the search direction and a step size are solved; I, output force at the position of a balancing node bus and output force of each distributed power supply are corrected, and the step B is jumped to; and J, an optimal power flow result is output. The optimal power flow optimization method of the distributed power supplies provides basis of access capacity calculation for determining the distributed power supplies to be connected in a power distribution network, is simple in calculation and low in complexity, and can rapidly calculate the output force of the distributed power supplies.

The invention provides a screen projection method and device and terminal equipment, and relates to the technical field of screen projection. The method comprises the steps that if a screen projectioninstruction is obtained, a real-time interface of a to-be-projected screen application program and equipment information of one or more receiving ends are obtained, first to-be-projected screen datacorresponding to all the receiving ends are obtained from the real-time interface according to the equipment information, and the first to-be-projected screen data are video streams, audio streams and / or user interface controls; and sending the first to-be-projected screen data to the corresponding receiving ends, so that each receiving end generates a corresponding display interface according tothe received first to-be-projected screen data. According to the embodiment of the invention, a screen projection mode with more abundant functions and more flexible operation can be realized.

The invention discloses an embedded four-axis motion controller which comprises a main controller and a motion control module. An output of the main controller is connected with the motion control module through an output interface, and the motion control module is respectively connected with an X-axis motion component, a Y-axis motion component, a Z-axis motion component, and a U-axis motion component. The controller of the invention adopts an S3C44BOX chip based on an ARM7TDMI core which is promoted by the Samsung company as the main controller, adopts a motion control chip MCX314As which is specially used by the NOVA company in Japan as an interpolate controller, adopts a PC104 bus interface with strong insertion ability, combines the embedded CPU with a special DSP motion control chip, embeds the motion control function in the framework of the ARM main control plate with a PC 104 function module method, cuts off the equipment that is not in need, has a plurality of functions and saves the cost. The invention is an independent motion controller which can be separated from a host computer and is characterized by strong computing ability and low cost, thereby extremely reducing the size of the system, lowering the power consumption, and improving the reliability and the openness of the system.

The embodiment of the invention provides a message processing method and a device and a system thereof. The method comprises the following steps of: receiving a first domain name resolving request message sent by a host computer, wherein the first domain name resolving request message carries a domain name required to be resolved by the host computer; determining a first DNS (Domain Name Server) from a domain name system DNS priority list, wherein the first DNS belongs to a DNS server set with a highest priority in the DNS server priority list; and sending a second domain name resolving request message to the first DNS according to the first domain name resolving request message, wherein the second domain name resolving request message carries a domain name required to be resolved by the host computer. According to the message processing method and the device and the system, provided by the embodiment of the invention, a DNS server is selected from the DNS server set with the highest priority in the DNS server priority list, so that the domain name resolving time can be shortened, and domain name resolving failures are avoided.

The invention discloses a servo system position IP controller model-free self-correcting method based on fractional order. The method includes: setting a reference model, exciting a system to obtain an offline database, initiating the related parameters of the system, updating the database according to input and output data newly collected at a current moment, selecting similar data queues according to a similarity criterion function, selecting the order of a fractional order controller, and using particle swarm optimization algorithm to perform self-correcting on fractional-order IP controller parameters. The method has the advantages that the fractional order feature of the system is considered, performance such as overshoot, rising time, error convergence speed and controller parameter variation is appraised comprehensively, the instantaneity of the system is guaranteed by using the similarity criterion function, the method is unaffected by unmodeled dynamics, and the robustness, disturbance rejection ability and control precision of the system are increased.

The invention relates to the technical field of lithium ion battery manufacturing, and particularly relates to a sorting and grouping method for lithium ion batteries. The sorting and grouping method is widely applied to sorting and grouping of battery packs of various types of electronic and electrical equipment such as small digital electrical appliances, electric bicycles and electric automobiles. The sorting and grouping method comprises the following steps: firstly, spraying codes on or numbering single batteries, and collecting first capacity, voltage and internal resistance of the single batteries; and aging the single batteries, collecting second voltage, internal resistance and recovery capacity of the single batteries, carrying out data statistics on grouping factors, establishing the grading standard of each grouping factor of the single batteries, determining the level of each grouping factor of each single battery, and selecting the grouping factors according to practical conditions to carry out sorting and grouping. The sorting process is simple, the requirement on sorting equipment is simple, and thus the sorting and grouping cost is reduced; the method has the function of preferably selecting battery packs with long service life, unqualified battery cores can be eliminated, and thus undesirable effects of produced battery packs can be reduced.

The invention provides a time control method of navigation management beam scanning. The time control method of the navigation management beam scanning solves the problems that the enquiry circle is prolonged and the time usage ratio is low when the secondary radar system navigation management monitoring function is compatible with other inquiring functions. According to the technical scheme, in a navigation management beam scanning time system, a navigation management monitoring airspace is evenly divided into a plurality of continuous beam positions; when a navigation management control command of a radar control table is sent to a digital signal processor (DSP) through a field programmable gate array (FPGA), the DSP reads a beam position dividing parameter from the FLASH and enables a FPGA timer to start beam position lingering time slot timing, and in each time slot, the DSP sends a scanning beam number of the next time slot to a beam control code connector controller of a phased-array antenna and an RS422 connector module of an answering signal processing device through the FPGA, and when time hopping happens, a pulse controller of the FPGA is controlled by the timer to generate an enquiry starting pulse; and the DSP judges the veracity of beam position switch according to the beam position number passed back from the phased-array antenna and the answering signal processing device.

The invention discloses a mixed induction type active electric power filter system. The mixed induction type active electric power filter system comprises a rectifier transformer, a filtering branch, a rectifier and the other filtering branch, wherein the other filtering branch comprises three passive filters and a voltage source inverter, the passive filters are connected to the voltage source inverter, the primary side of the rectifier transformer is connected to a three-phase power grid through connecting impedor, an epitaxy winding of the secondary side of the rectifier transformer is connected with the rectifier, and the passive filters are connected to three junction points between a delta winding and the epitaxy winding of the secondary side of the rectifier transformer in parallel respectively. According to the mixed induction type active electric power filter system, influence of frequency fluctuation of the power grid side and the high-capacity nonlinear load side on electric power filtering performance is eliminated; meanwhile, the problems that serious harmonic pollution, high additional loss of a master device, high vibration and noise, low system power factor and low system operation efficiency are caused by harmonic waves and idle work to an industrial power distribution and consumption system are effectively solved on the premise that electric power quality on the power grid side meets the national standard of China.

The invention discloses a TOA positioning estimation method and a precise positioning method based on the same. The positioning method comprises the following steps of: transmitting a multi-carrier digital television signal carrying positioning information, wherein the positioning information comprises the two-dimensional or three-dimensional coordinate position information and the positioning data of a transmitting end, and the positioning data is a known sequence; carrying out time-domain frame synchronization on the received multi-carrier digital television signal so as to obtain a rough transmission time-delay estimation value; intercepting the positioning data and calculating by utilizing the TOA positioning estimation method to obtain a fine transmission time-delay estimation value so as to obtain an estimation value of a distance between a receiving end and a transmitting end; and after the estimation values of the distances between the receiving end and a plurality of transmitting ends are solved, calculating to obtain the two-dimensional or three-dimensional position information and the two-dimensional or three-dimensional speed information of the position of a user according to the distance estimation values and the two-dimensional or three-dimensional coordinate position information. The invention has simple algorithm, high speed of positioning update, strong system compatibility and wide application range and can realize precise positioning.

The invention discloses an instruction set batch testing device and method for a processor. The instruction set batch testing device comprises a test case batch management device, a source file compiling device, a configuration file parsing device and a debugging device, wherein the test case batch management device is respectively connected with the configuration file parsing device and the source file compiling device, and the configuration file parsing device is connected with the source file compiling device and respectively connected with the test case batch management device and the debugging device. According to the instruction set batch testing device disclosed by the invention, the configuration file parsing device is utilized for generating an automatic test script, so that a great deal of testing work can be automatically implemented, a test result can be given out, and a user can be free of the complexity in compiling the test script and the inconvenience in manual observation of instruction behavior; and by constructing the test case batch management device for performing effective organization, management and maintenance on a test case library, a test implementation plan can be fast and accurately made, the user can complete the verification of the functions of the processor with high efficiency, and the test result is comprehensive and accurate.

The invention relates to a bandwidth-adaptive big iteration receiver. For a broadband multi-antenna orthogonal frequency division multiplexing (OFDM) communication system, the traditional minimum mean square error (MMSE) receiver and a Turbo / LDPC code decoder are combined together so as to compose the big iteration receiver which can provide interference cancellation; and the receiving schemes and the iterating parameters in various OFDM application contexts with different bandwidths are subjected to adaptive adjustment so as to reach the optimal system performance. The receiver provided by the invention has the following working steps: (1) detecting parameters, such as the size of bandwidth, the length of a transmission block, the number of code block, the code rate and the like, which are allocated to a user by a receiving terminal; and (2) calculating the time required for finishing detecting and decoding according to the obtained communication parameters. If a context cannot support the big iteration receiver under the real-time requirements, a receiving scheme is adjusted to be a non-iteration form; and if the iterative reception can be adopted, an MMSE soft interference cancellation-based big iteration detecting scheme which is in a double Turbo form is selected, and the parameters required for the big iteration are further determined.

The invention discloses a method for scheduling ACK / NACK for an LTE-TDD system. The method comprises the following steps: a network side makes statistics on distributing condition of UE downlink service data of each user equipment, for each UE, monitoring is carried out on that whether the downlink service data is scheduled or not; after schedule of certain UE downlink service data is determined, message is transmitted to the UE to inform a channel feeding back ACK / NACK; and the UE feeds back ACK / NACK on the corresponding channel according to the received message. The invention provides an ACK / NACK feedback proposal for the LTE-TDD system to ensure effective transmission of ACK / NACK under the circumstance that downlink sub-frame is more than uplink sub-frame. Corresponding to the method, the invention also provides an ACK / NACK dispatcher for the LTE-TDD system.

The invention discloses a resisting force dodging device for controlling a floor heave, and a construction method for the device. The resisting force dodging device comprises an anchoring system and a resisting force dodging system, wherein the anchoring system comprises a sleeper type anchoring beam, a prestressed anchor rod and prestressed anchor cables, and is used for providing anchorage force for the resisting force dodging device; the resisting force dodging system comprises slide components, an arc-shaped elastic steel strip and high-strength springs; the slide components are mounted at arch supports of a tunnel; the bottom of the arc-shaped elastic steel strip is fit with a pit bottom, and the two ends of the arc-shaped elastic steel strip are inserted into the slide components; the high-strength springs are arranged between the sleeper type anchoring beam and the arc-shaped elastic steel strip. The device adopts the concept that the resisting force dodging system and a base plate deform together, so that a problem that the deformation of the soft rock roadway floor heave is large is solved; the resisting force of the device increases along with the increase of the deformation, and finally, the deformation of the floor heave is controlled within a resisting force dodging space, so that the floor heave is effectively controlled in a highland stress soft rock roadway, and the application prospect is broad.

The invention discloses a multilink transmission method and device, a multilink receiving method and device, a storage medium and a terminal. the multilink transmission method comprises the steps: determining a link synchronization group which comprises a single main link and at least one auxiliary link, and enabling the at least one auxiliary link to be synchronous with the main link; and when synchronous transmission is carried out by adopting multiple links, transmitting different data packets on the main link and the auxiliary link respectively. According to the technical scheme provided by the invention, the data transmission efficiency is improved, and a feasible technical scheme is provided for multi-link synchronous transmission.

The invention relates to the technical field of communication, and provides tensor model based channel estimation method and device. The method comprises the steps of creating a three-order tensor model of an uplink signal received by a base station in an uplink multi-user coordination system according to the created uplink signal system model, wherein the three dimensions of the three-order tensor model are respectively corresponding to the uplink signal, an arrival angle and a time-varying channel of the uplink signal; performing blind tracking for the time-varying channel by the PARAFAC-LMST method or the PARAFAC-RLST method according to the three-order tensor model and the new uplink increase signal received by the base station to obtain the estimation value of the time-varying channel. The device comprises a first creating module, a second creating module and a channel estimation module. The device is applicable to a coordinative communication system of a slow-varying channel as well as the coordinative channel system of a rapid fading channel.

The invention discloses an unmanned aerial vehicle airborne platform-based vehicle type identification method and belongs to the technical field of video images. The method comprises the following steps of S1: adjusting the height of an unmanned aerial vehicle above the ground to a position suitable for vehicle type identification; S2: acquiring infrared image positive and negative samples used for vehicle target detection offline, performing characteristic extraction by utilizing a convolutional neural network (CNN), and performing support vector machine (SVM) training to obtain an SVM classifier model used for online vehicle type identification; S3: performing infrared photography by utilizing an infrared video camera to obtain a video image signal; and S4: performing sliding window sampling on a shot infrared image sequence, extracting vehicle type characteristics by utilizing the CNN, and inputting the characteristics in the classifier model obtained in the step S2 to perform classification. According to the method, the vehicle type identification can be finished in the day, at night and under the condition of severe weather condition and relatively low visibility by adopting the infrared video camera; and meanwhile, the method can be used for dynamically selecting a detection region, so that the flexibility of a detection system is improved.

The invention releases to a kind of embedded numerical control system that is based on ARM and DSP. It contains a main control that is micro-processor S3C44B0 slug and an interpolating control that is DSP slug and TMS2812 slug from the TI Company. The working process of the embedded numerical control system is that the G-code of the user inputting is transformed by ARM7 embedded micro-processor into orders that can control every electric motor by numerical control system. The orders contain G order, M order, S-order and T-order and so on. The orders are put into TMS2812 interpolating control by the micro-processor and than put out the clamp-pulse driven module. The invention has ARM+DSP configuration instead of original PC configuration. The advantages of the embedded numerical control system are strong calculation and low cost so as to reduce the volume and power consumption of the system and improve the dependability and reconfiguration of it.

The invention discloses an equipment control method and a mobile terminal. The method comprises the steps of collecting an image comprising at least one first class of equipment, displaying the image including the at least one first class of equipment in a display area, wherein the first class of equipment is terminal equipment at least having an image display function; establishing a first communication connection with the at least one first class of equipment; and when a corresponding operation command is detected via a control interface of first target equipment in the at least one first class of equipment, sending the operation command to the first target equipment, wherein the control interface is located at a display position in the display area of the first class of equipment, and is at least used for providing an interface for controlling output information of the first class of equipment or an operation parameter of the first class of equipment.

The embodiment of the invention provides a service object recommendation method and device and electronic equipment. The service object recommendation method includes: acquiring anchor attribute data,audience attribute data and multiple pieces of service object attribute data of a live-streaming room; selecting a target service object in multiple service objects on the basis of the anchor attribute data, the audience attribute data and the multiple pieces of service object attribute data; and displaying the target service object in the live-streaming room. By adopting the embodiment of the invention, the target service object with a higher putting effect can be selected to be displayed in the live-streaming room, thus the service object displayed in the live-streaming room can be enabledto have a higher display effect, and a utilization rate of network resources can be increased.

The invention discloses a drum stress test device and a method thereof and relates to the technical field of crane drum stress tests. The drum stress test device comprises a duplex-drum assembly, a steel wire rope (10), a drive assembly and a mounting rack (15). The duplex-drum assembly comprises a duplex drum (1). The test device further comprises a loading assembly. The loading assembly comprises a pulley set (11), a hydraulic oil cylinder (12) and a hydraulic pump station (13). According to the drum stress test device and the method, only one drive device set is needed, and the drive assembly and the loading assembly can be used as universal pieces to be suitable for different drums; the test cost is lowered, power consumption is lowered, and energy is saved.

The invention discloses a phase-switching prescaler based on injection-locking, comprising a multi-phase generator, a multi-channel selector, a true single-phase clock module and a state machine. The multi-phase generator is used for primarily scaling the signal to be scaled and generating N signals with equal phase difference; the multi-channel selector is used for selecting one branch of signal from the N signals with equal phase difference; the true single-phase clock module is used for secondarily scaling the branch of signal selected from the N signals with equal phase difference by the multi-channel selector to obtain the output signal of the phase-switching prescaler; and the state machine is used for transforming the scaling-ratio control signal of the phase-switching prescaler into the control signal of the multi-channel selector. Avoiding adopting the current mode logic, the phase-switching prescaler keeps consuming low power when working at high frequency. An even number of signals with equal phase difference can be generated, thus the scaling-ratio can be selected flexibly when the system is designed. The phase-switching prescaler has better ability of resisting the common-mode noise.

The invention discloses a reinforcement structure for arch-covering-method underground excavation subway station arch feet and a construction method. The reinforcement structure for the arch feet comprises two layers of arch cover supports, arch foot piles distributed at the arch feet of the left and right sides of subway station arch cover bodies and arch foot longitudinal beams, the arch foot longitudinal beams and the arch foot piles are integrally connected, and pile bodies of the arch foot piles are distributed along the tangent line of the arch feet; each arch foot pile is composed of asection steel framework and fine aggregate concrete which is poured into the section steel framework and pile holes. The reinforcement structure is a reinforcement system combining the arch foot pileswith the longitudinal beams, the longitudinal beams are connected with the arch foot piles and the first and second layers of arch cover supports, the structural integrity is good, the capacity of resisting local stress and deformation is high, and deep and thick smashed surrounding rock at the arch feet can be effectively reinforced and protected; in addition, according to the construction method of the reinforcement structure for the arch feet, the reinforcement range and implementation objects are flexibly selected, rock layers of the arch feet for supporting arch covers are smashed, the integrity influence cannot be caused, and the advantages of an arch-cover method in the aspects such as project cost, construction working period, implementation efficiency and mechanical operation cannot be influenced.

The invention belongs to the technical field of vibration reduction and noise reduction, and in particular, relates to a metamaterial vibration isolating technology. A ultralow-frequency and shock-resistance metamaterial vibration isolating device comprises a metamaterial vibration isolating part (1), a lower positioning cover (2), an upper positioning cover (3), an inner limiting shell (4), an outer limiting shell (5), a lower bolt set (6) and an upper bolt set (7). The ultralow-frequency and shock-resistance metamaterial vibration isolating device theoretically can realize any low frequency range, so that the metamaterial vibration isolating device can bear higher static load on an online elastic deformation section, and can realize ultralow-frequency vibration isolating effect of a vibration isolating system on a ultralow-frequency vibration isolating section; and the metamaterial vibration isolating device is high in shock resistance, and can improve the safety of the vibration isolating system. The metamaterial vibration isolating part is not limited by a base material, so that the adaptability is wide.

The invention relates to a water-based rechargeable zinc ion battery based on an organic electrode material, and belongs to the field of secondary batteries. A device comprises a zinc metal negative electrode, a diaphragm and a positive electrode based on a polymer. An electrolyte is a zinc sulfate aqueous solution. The positive electrode of the device is mainly a polymer electrode material attached to porous activated carbon, and plays a decisive effect on the energy storage capacity, the voltage window and the electrochemical behavior. The organic electrode material disclosed by the invention shows relatively high specific capacitance and excellent cycling performance. The organic electrode material and the activated carbon are combined, so that the electrode has the characteristic of high mass carrying capacity. The unit area capacity of the prepared device is in the level of F / cm2 or mAh / cm2. The maximum voltage of the device is between 1.6V and 1.9V, depending on the choice of thepolymer electrode. The polymer / porous activated carbon composite material electrode disclosed by the invention can be used for preparing the water-based zinc ion secondary battery with high energy density and long cycle life.

The invention discloses a wide area traffic jam detection method based on an unmanned plane airborne platform and belongs to the technical field of video images. The method comprises steps that 1, the GPS technology is utilized to acquire height of an unmanned plane to the ground, whether jam detection can be carried out is determined, if not, the spatial position of the unmanned plane is adjusted; 2, positive and negative samples of infrared vehicle images are acquired in an offline mode, HOG characteristics of the samples are extracted, and an SVM model is trained; 3, an infrared image signal is acquired by utilizing an infrared camera; 4, sliding window sampling of the infrared images is carried out, HOG characteristics of a sliding window zone are extracted, a SVM model is utilized to carry out vehicle detection, statistics of a total number N of vehicles in a present vision field is carried out; and 5, according to the height H of the unmanned plane and the total number N of the vehicles, a jam index C is calculated, and the detection result is returned. Through the method, detection on a traffic jam state under the condition of bad weather and low visibility can be accomplished by utilizing the infrared camera, moreover, detection zones can be dynamically selected by the unmanned plane airborne platform, and a detection system is made to be more flexible.

The invention discloses a signal generation method of a low-interference multispeed multi-cell quasi-synchronous code division multiple access (CDMA) communication system. The method comprises the steps: a spread spectrum sequence code group is an Hadamard matrix set with certain idealized characteristics formed by Bent functions and a Walsh-Hadamard orthogonal sequence set; a sequence set with the characteristic of a similar zero correlation zone (ZCZ) sequence is obtained by calculating with a pair of complementary sequence sets by utilizing the Hadamard matrix set; and a plurality groups of sequence sets with the similar ZCZ sequence characteristics are obtained by carrying out Cartesian convolution operation with the orthogonal sequence set by utilizing the similar ZCZ sequence set. When a system maximum synchronization error and a channel maximum multipath delay spread are in the stated range, the system interference can be reduced greatly. The parameters of the spread spectrum sequence code group and the system efficiency can be adjusted and flexibly selected according to the practical factors. Therefore, the requirements of power control and synchronization by the CDMA communication system are reduced, and the complexity of system realization is lowered.

The invention discloses a human face recognition method and system based on kernel non-negative matrix factorization, and a storage medium. The method comprises the steps: constructing a fractional order inner product kernel function, wherein the fractional order inner product kernel function exerts no limit on a power exponent parameter; obtaining a fractional order inner product kernel non-negative matrix factorization algorithm through the combination of the fractional order inner product kernel function and the kernel non-negative matrix factorization; and carrying out the human face recognition through the fractional order inner product kernel non-negative matrix factorization algorithm. The method solves a problem that the power parameter of a polynomial kernel function just can be an integer, and enables the selection of the power parameter to be more flexible. The method effectively irons out the changes of posture and illumination in human face recognition. Moreover, the method is quick in convergence and excellent in recognition performance.

The invention discloses a coaxial double-waveguide ytterbium-doped active fiber and a preparation method thereof. An ytterbium-doped quartz layer is deposited between a circular Ytterbium-doped fiberpre-form rod and an outer quartz glass tube to present a circular geometric distribution shape. Negative-pressure rod shrinkage is carried out on the outer quartz tube and the inner circular fiber pre-form rod so that a circular ytterbium-doped fiber core is fused with the outer quartz tube and the circular fiber pre-form rod to form a coaxial double-waveguide ytterbium-doped active fiber pre-formrod. Then, the pre-form rod is ground and polished to make a fiber cladding in an octagonal shape. After drawing, coating with low refractive index is applied as a coating layer, and a coaxial double-waveguide ytterbium-doped fiber is obtained. The method is simple and practical, has high process flexibility, and can be used to prepare coaxial double-waveguide ytterbium-doped fibers of differentcore-to-cladding ratios. The interaction between pump light and a gain medium fiber core in the cladding is enhanced, and the intensity of the output optical field of the fiber is improved. The coaxial double-waveguide ytterbium-doped active fiber can be used in the development of high-power fiber laser related devices.