404results about How to "Solve the distance problem" patented technology

The invention relates to an ultra-large full-face rectangular pipe jacking tunneling construction method, which comprises the following steps that: a tunnel line axial line is determined, and a launching shaft and a receiving shaft are set; a pipe jacking machine is arranged on a guide rail arranged in the launching shaft to be debugged; the pipe jacking machine performs tunneling along the tunnel line axial line, and pipe joints are spliced in the launching shaft; when the pipe jacking machine reaches the receiving shaft, the pipe joints are separated from the pipe jacking machine, and the tunnel breakthrough is realized; curing slurry is injected to pipe joint peripheries through slurry injecting holes formed in the pipe joints, and soil bodies around the tunnel are reinforced; and shaft joints are cast in connecting positions of structure lined walls and the pipe joints in the positions of the receiving shaft and the launching shaft. The ultra-large full-face rectangular pipe jacking tunneling construction method has the advantages that the hole entering and exiting and non-excavation tunneling construction of the pipe jacking machine is realized; the ultra-large full-face rectangular tunneling construction is realized; and the problems in a long-face long-distance and curve tunneling process in the conventional ultra-large full-face rectangular pipe jacking tunneling construction are solved.

The invention discloses a road marking automatic detection and classification method based on a mobile laser scanning point cloud. The method comprises the following steps: S1, performing pavement segmentation on original point cloud data to obtain pavement point cloud data; S2, performing intensity correction on the pavement point cloud data by use of an incident angle; S3, performing binary processing on the pavement point cloud data, and extracting road marking points; S4, segmenting the road marking points to separate mutually independent road marking targets; S5, calculating feature parameters of the road marking targets; and S6, by use of the feature parameters, constructing a decision tree, and classifying the road marking targets. The method can rapidly and accurately perform automatic detection and classification of road marks from the mobile laser scanning point cloud, greatly reduces the data processing time and the labor cost, and effectively guarantees the traffic safety and the reliability of intelligent driving.

The invention discloses an optical fiber sensor-based natural gas pipeline leakage monitoring method and an optical fiber sensor-based natural gas pipeline leakage monitoring system. Optical fibers in a communication optical cable which is laid in the same channel of an oil and gas pipeline respectively serve as a transmitting optical fiber and a returning optical fiber; pipeline leakage optical fiber sensors are connected in parallel between transceiving transmitting optical fibers to form an optical path by an optical multiplexing technology; the pipeline leakage optical fiber sensors are uniformly arranged along the pipeline; laser light emitted from a light source is subjected to beam splitting through a transmission optical path and is transmitted to the sensors arranged on the wall of the pipeline; after the sensors pick up leakage vibration signals and noises propagated along the pipeline, the leakage vibration signals and the noises are returned to a photoelectric detector part of the system through the transmission optical path; the acquired vibration wave signals are analyzed and processed; and the position of a vibration wave source is determined by combining the propagation speed of the vibration wave on a pipeline body according to the time delay of the vibration waves propagated to a plurality of adjacent optical fiber sensors. By the method and the system, the flexibility is high; and the positioning accuracy is high.

The invention discloses an optical fiber sensor-based natural gas pipeline leakage monitoring method, an optical fiber sensor-based natural gas pipeline leakage monitoring system and a system construction method. Optical fibers in a communication optical cable which is laid in the same channel of an oil and gas pipeline respectively serve as a transmitting optical fiber and a returning optical fiber; pipeline leakage optical fiber sensors are connected in parallel between transceiving transmitting optical fibers to form an optical path by an optical multiplexing technology; the pipeline leakage optical fiber sensors are uniformly arranged along the pipeline; laser light emitted from a light source is subjected to beam splitting through a transmission optical path and is transmitted to the sensors arranged on the wall of the pipeline; after the sensors pick up leakage vibration signals and noises propagated along the pipeline, the leakage vibration signals and the noises are returned to a photoelectric detector part of the system through the transmission optical path; the acquired vibration wave signals are analyzed and processed; and the position of a vibration wave source is determined by combining the propagation speed of the vibration wave on a pipeline body according to the time delay of the vibration waves propagated to a plurality of adjacent optical fiber sensors. By the method and the system, the flexibility is high; and the positioning accuracy is high.

The invention provides an all-solid-state planar array three-dimensional imaging laser radar system, which comprises a detection target, a laser planar array data acquisition and point cloud generating module, and a data processing system, wherein the detection target is installed on a butting surface of a all-solid-state planar array three-dimensional imaging laser radar, so that a pulse laser signal transmitted by means of the laser radar for tracking the detection target returns in the original path, a reception and detection system of the laser radar completes the searching and capture ofthe detection target, acquires relative distance and position measurement parameters of the detection target in real time and acquires a plurality of feature points of the detection target in a laserirradiation range of the detection target and the laser radar, and the feature points are set in an optical field of view region with a fixed divergence angle; the laser planar array data acquisitionand point cloud generating module completes the measurement of the detection target and the depth data generation of the feature points, and transmits the depth data to the data processing system; andthe data processing system calculates azimuth information according to the depth data of each feature point and pixel positions in the field of view region, calculates angle and distance data and calculates attitude data of the detection target.

The invention discloses an ejector for soil deep placement. The ejector comprises an airflow conveyer for conveying high-pressure jet airflow, wherein an airflow channel and a fertilizer channel for feeding a fertilizer are arranged in the airflow conveyer; the airflow channel is in a venturi structure; a fertilizer outlet of the fertilizer channel is communicated with a shrinkage area of the airflow channel; and the airflow conveyer is used for conveying the high-pressure jet airflow. The airflow channel is in the venturi structure, and can play an accelerating role in the flowing airflow; meanwhile, the fertilizer channel and the fertilizer outlet of the fertilizer channel are communicated with the shrinkage area of the airflow channel; and negative-pressure material suction is formed on a powder fertilizer by the high-pressure jet airflow flowing through the airflow channel, so that the powder fertilizer is mixed with the high-pressure je airflow in the airflow channel to enter soil along with the high-pressure je airflow, and thus the target of the deep placement is reached.

The invention relates to a multi-functional river management hull robot. The multi-functional river management hull robot comprises a hull robot main body, a garbage cleaning unit, an oxygen aeration unit, a random detection unit, an intelligent drug delivery unit, an automatic filter unit and a control center; and the control center is connected with the oxygen aeration unit, the random detection unit, the intelligent drug delivery unit and the automatic filter unit through a wireless mode, the control center receives the pollutant data sent by the random detection unit and sends instructions to the oxygen aeration unit and the automatic filter unit to turn on or turn off the oxygen aeration unit and the automatic filter unit, and the control center sends the instructions of opening a corresponding agent unit valve to the intelligent drug delivery unit, so that agents of a corresponding agent unit are sprayed into a river to achieve treatment of pollutants. According to the multi-functional river management hull robot, the pollutants in the river can be cleaned completely in one effort, the solar energy and the wind energy are used as power generation ways, the problem that equipment power supply depends on the battery capacity or being close to power facilities is solved, and the functions of automatic cruise and obstacle avoidance are achieved.

The invention relates to an intelligent chess playing control method and a control system, and belongs to the field of intelligent battle platforms. The invention provides the intelligent chess playing control method and the control system, in order to overcome shortcomings of an existing playing system which can support offline playing only and cannot simultaneously solve problems on physical distance constraint and real playing feeling. The intelligent chess playing control method comprises the following steps: acquiring a frame in a video flow and taking the acquired frame as a current frame; recognizing central position coordinates of markers at four corners of a chessboard; conducting projective transformation on an image; and acquiring a moving way of a user through threshold analysis and inputting the moving way into a decision algorithm so as to obtain optimum chessman locating positions. According to the remote playing system provided by the invention, the chessboard image is acquired by virtue of a camera, chessman moving data is extracted and the chessman moving data is transmitted to the online user by virtue of a server; and then, chessman moving steps of the online user are acquired by virtue of an embedded platform through the server and the steps are transmitted to a single chip by virtue of a serial port, and subsequently, chessmen are moved by controlling a mechanical arm. The intelligent chess playing control method and the control system provided by the invention are applicable to intelligent chess playing platforms.

The invention discloses an air conditioning system and a communication method. The air conditioning system comprises an outdoor unit and a plurality of indoor units. The outdoor unit is in communication with the indoor units through a wireless ad hoc network. The communication method comprises the following steps: the indoor units send out search signals for searching the outdoor unit, search and obtain wireless signals of the outdoor unit and are connected with the outdoor unit according to the signal conditions of the outdoor unit to perform communication or connected with the outdoor unit through other indoor units serving as relays so as to perform communication. The outdoor unit and the indoor units are connected through the wireless ad hoc network, a communication cable and a gateway do not need to be arranged independently, the problem of limitation of the connection number of the indoor units connected with the outdoor unit and the connecting distance is solved, the troubleshooting and maintenance are performed easily, and the installing and using cost of the air conditioning system is effectively reduced.

The invention discloses a hexa-rotor aircraft, comprising a centre frame, six arms uniformly distributed at the periphery of the centre frame and a foot rest arranged below the centre frame, wherein a battery is arranged at the bottom surface of the centre frame, a holder is arranged below the centre frame, a camera is fixed on the holder, the front end of each arm is provided with a blade, and the front part of each arm is provided with a motor connected with the battery and located below a corresponding blade. The hexa-rotor aircraft provided by the invention can more easily realize horizontal and stable hovering in the process of flight; moreover, the aircraft employs electricity for a power system, so interference to an electric transmission line is not generated, the problem that a common aircraft cannot closely look over, monitor and shoot an electric transmission line is overcome, and the hexa-rotor aircraft has better security.

The invention discloses a hinged railway vehicle bogie and a railway vehicle. The hinged railway vehicle bogie comprises a non-integral framework which is formed mainly by hinging a first portion to a second portion. A first wheel axle is installed on the first portion of the framework, a second wheel axle is installed on the second portion of the framework, and the first wheel axle and the second wheel axle form an included angle when the railway vehicle passes a curve. According to the hinged railway vehicle bogie and the railway vehicle, the accessible curve radius is small, the eccentric wear of a walking wheel is less, and the maintenance cost is low.

The invention discloses a method and a system for a ship in a bridge area to actively avoid collision based on a laser three-dimensional imaging technique. The method comprises the following steps of S1, enabling the actively avoid collision system to judge whether the ship enters a recognition area or not; S2, enabling a data collection module to collect data, so as to obtain collected data information; S3, enabling a data storage module to store waterway basic information and the collected data information; S4, enabling a data processing terminal to judge navigation opening and track according to the waterway basic information and the collected data information; S5, publishing decision information. The method has the advantages that the relative position between a bridge pier, a navigation beacon as well as surrounding ships and the ship in the inland river bridge area can be accurately judged; by utilizing the collected data information and the accurate bridge pier and navigation beacon position information in an electronic waterway map, the navigation state of the ship is predicted, so as to ensure the navigation safety of the ship in the inland river bridge area.

The invention provides a meeting system based on array type microphones. The meeting system based on the array type microphones comprises the array type microphones, a switch control circuit, a loudspeaker and a wireless controller, wherein the switch control circuit and the loudspeaker are connected with the array type microphones; the array type microphones are more than two microphones arranged on a meeting table in sequence; the wireless controller comprises an MCU single-chip microcomputer, a first pickup, a second pickup and a wireless emitting module; the wireless controller is connected with the switch control circuit; the wireless controller judges whether a participant makes a statement or not through the second pickup until one participant makes a statement, and the volume of voice heard by the spokesman can be detected through the first pickup; the MCU single-chip microcomputer compares the volume of the voice with a set numerical value and sends the result to the switch control circuit. The meeting system based on the array type microphones achieves the pickup effect, the spokesman can make a statement easily, the voice is prevented from being too large or too small suddenly, and meanwhile the quality of output voice is ensured.

The invention relates to a power patrol inspection robot infrared temperature measuring device and a power patrol inspection robot infrared temperature measuring method integrating a distance and viewing angles. The temperature measuring device comprises a robot cart body, and a positioning mechanism, a CCD camera, an infrared thermal imager, an ultrasonic range finder sensor, a control processingmodule and an upper computer which are arranged on the robot cart body. The temperature measuring device further comprises a first tilt angle sensor and a second tilt angle sensor, wherein the firsttilt angle sensor is used for measuring a positioning mechanism vertical elevation angle and an infrared thermal imager observation viewing angle, and the second tilt angle sensor is used for measuring a robot cart body climbing angle. According to the power patrol inspection robot infrared temperature measuring method, an actual distance between the infrared thermal imager and an object body is calculated by means of the measured angles and a straight-line distance, and the actual distance and the observation angle are substituted into a compensation formula to correct or compensate for measured temperature. Compared with the prior art, the power patrol inspection robot infrared temperature measuring device and the power patrol inspection robot infrared temperature measuring method can compensate for the influence of the observation distance and the observation viewing angle on an infrared temperature measuring result, are suitable for temperature patrol inspection of a power patrol inspection robot, a patrol inspection UAV and a related functional patrol inspection instrument, thus have high practical value.

The invention relates to the field of carbide slag recycling in calcium carbide method acetylene production, in particular to a method that after physical separation is performed on carbide slag impurities, a calcium hydroxide component in the carbide slag impurities is extracted, and then calcium carbide raw materials are produced through carbide slag. The method for producing the calcium carbide raw materials through the carbide slag mainly comprises the following steps of fresh carbide slag screening; magnetic separating; ore grinding; ore pulp preparing; suspension separating; dewatering; carbon mixing, wherein filter cakes which are obtained after dewatering is performed and contain certain moisture are mixed with carbon material particles of which the particle size is smaller than or equal to 2 mm and the fixed carbon content is larger than or equal to 70% in a mixing machine according to the mass fraction ratio of 1.63:1-2.91:1; granulating and forming; drying; calcining. According to the method for producing the calcium carbide raw materials through the carbide slag, the shortcomings and defects in the prior art can be effectively overcome, reclamation recycling of the carbide slag is achieved, the impurities in the carbide slag can be effectively removed, the technology is simple and convenient, and the economical efficiency and practicability are achieved.

The invention relates to a leakage point locating system of an optical fiber sensing natural gas pipeline leakage monitoring system. The leakage point locating system comprises a light source, a transmission light path part, optical fiber sensors, a photoelectric detector, and a signal collection and processing module; the optical fiber sensors are arranged on a pipe body at certain intervals, an optical fiber sensor group consists of the optical fiber sensors, and each sensor is connected to the light source and the photoelectric detector through the transmission light path and an output of the photoelectric detector is serially connected with a signal conditioning unit, a signal collection unit and a processing unit in the signal collection and processing module; a display terminal and an external interface are arranged in the output of the processing unit; the output of the signal collection and processing module is connected with a microcomputer through an external interface. The leakage point locating system of the optical fiber sensing natural gas pipeline leakage monitoring system provided by the invention can monitor either emergent or transmitted leakage signals, and has the advantages of good locating accuracy, stable property and the like.

A no-parking type microcirculation urban rail traffic system is an urban public traffic system which can facilitate travelling of urban people and relieve urban traffic congestion pressure. The system is characterized by being composed of annular rails, a rail car set and coaches. The annular rails connected end to end are built on a street on the periphery of a small urban area, each annular rail surrounds one or more small urban areas according to the actual area of the small urban area, one part of each annular rail is located on a main street or a collector street, guide rails are arranged in the annular rails, the rail car set running cyclically at a set constant speed clockwise in a no-parking mode is arranged on the guide rails, stations are arranged at fixed points of the annular rails, the coaches are arranged on the stations, and the whole system is driven by electric power. The system can achieve the following aims that traveling of people on branches, the main street and the collector street is organically connected, and the problems about one starting kilometer and the last kilometer are well solved; the needs for short-distance travelling on the main street and the collector street are met.

The invention discloses an orbit-change mechanism control system for an electric power tunnel inspection robot and a control method. According to the orbit-change mechanism control system, an inspection robot communicates with an orbit-change control unit through a tunnel wireless network; the orbit-change control unit comprises a local control box, a motor driver, a motor, a control feedback sensor and an orbit-change device; the local control box, the motor driver and the motor are sequentially connected; the motor is connected with the orbit-change device; the control feedback sensor is connected with the orbit-change device and the local control box respectively; and the orbit-change device is arranged on a junction of a tunnel. The orbit-change mechanism control system and the control method have the beneficial effects that monitoring equipment can move along a fixed orbit in the tunnel and can automatically adjust a changeable orbit for inspection path selection; the defects that fixed monitoring can only be carried out at a fixed point and short-distance operation cannot carried out are really avoided; and visual inspection in a real sense is implemented on a tunnel body and a cable in the tunnel.

The invention discloses a photovoltaic intelligent road facilitating continuous charging of an electric automobile in running. The photovoltaic intelligent road is of a four-layer structure from top to bottom, a photovoltaic cell array, a positioner, a detector and a power transmitting module are arranged in a second layer, the photovoltaic cell array and the power transmitting module are alternately connected in series at intervals or connected with each other, and a current collection device and monitoring system, a storage battery, a controller and an inverter are arranged in a third layer.When the electric automobile passes the photovoltaic intelligent road, a receiving circuit generates oscillating current when inherent frequency of a receiving coil of the electric automobile is as same as electromagnetic field frequency, so that magnetic field is converted into electric energy, and a storage battery in a driving electric automobile is charged. The photovoltaic intelligent road can sufficiently utilize solar energy, is safe in charging process and high in charging efficiency and solves the problems of universal long charging time and short diving distance of an electric automobile, the charging efficiency of the electric automobile is remarkably improved, and the driving distance of the electric automobile is prolonged.

The invention discloses an optical fiber sensor-based natural gas pipeline leakage monitoring method, an optical fiber sensor-based natural gas pipeline leakage monitoring system and a system construction method. Optical fibers in a communication optical cable which is laid in the same channel of an oil and gas pipeline respectively serve as a transmitting optical fiber and a returning optical fiber; pipeline leakage optical fiber sensors are connected in parallel between transceiving transmitting optical fibers to form an optical path by an optical multiplexing technology; the pipeline leakage optical fiber sensors are uniformly arranged along the pipeline; laser light emitted from a light source is subjected to beam splitting through a transmission optical path and is transmitted to the sensors arranged on the wall of the pipeline; after the sensors pick up leakage vibration signals and noises propagated along the pipeline, the leakage vibration signals and the noises are returned to a photoelectric detector part of the system through the transmission optical path; the acquired vibration wave signals are analyzed and processed; and the position of a vibration wave source is determined by combining the propagation speed of the vibration wave on a pipeline body according to the time delay of the vibration waves propagated to the adjacent optical fiber sensors. By the method and the system, the flexibility is high; and the positioning accuracy is high.

A control system of construction schedule for large - scale underground cave group based on network environment combines visual artificial technique with S form curve of construction schedule. It comprises presentation layer used on management boundary, client end, statistic report boundary, status identification module, webpage, report output module, application layer, databank trigger, data indexing module, real time analysis and management module of construction schedule network plan of S form curve, analysis and regulation module, device configuration module and data layer.

The invention discloses a method and system for measuring propagation speed of natural gas pipe leakage vibration wave. The method and the system are on the basis of an optical fiber sensed natural gas pipe leakage monitoring method. A natural gas pipe leakage monitoring system selects a known sensing unit point to simulate pipe leakage in the form of hitting a pipe to initiate vibration; according to the number of pipe sections used in project construction and inspection and acceptance data, leakage signals transmitted to two adjacent sensing units are subjected to time-delay estimation; leakage vibration wave speed is measured by combining known pipe length; the distances from the current test point to two adjacent sensing unit points are accurately obtained; a simulating test point X is substituted into the formula that X is equal to L-[v*(tn+2-tn)]/2 to inversely solute the formula that v is equal to 2(L-X)/(tn+2-tn); and the propagation speed of vibration wave along the pipe is measured according to the distance between known sensing units and detected signal transmitting time. The method and the system are high in sensitivity and accuracy, and low in false alarm rate and are not easily affected by environmental factors.

The invention provides an intelligent speaker and a voice interaction method for the intelligent speaker. The intelligent speaker comprises a master device and at least one slave device, wherein the master device comprises a first communication module and a processing module; the at least one slave device comprises a microphone module, a loudspeaker module and a second communication module; the microphone module is used for acquiring a voice control instruction; the processing module is used for generating a voice feedback result according to the voice control instruction; the loudspeaker module is used for playing a voice feedback result; the second communication module is used for sending the voice control instruction to the first communication module and receiving the voice feedback result; and the first communication module is used for receiving the voice control instruction and sending the voice feedback result to the second communication module. Therefore, the technical problem that the intelligent speaker is limited by distance and space in the related technology is solved, so that the intelligent speaker can be conveniently arranged and used in a plurality of rooms.

The invention discloses a whole-pneumatic air burst fire extinguishing bomb relating to a fire extinguishing bomb, and provides an air burst fire extinguishing bomb with flexible and light use. The whole-pneumatic air burst fire extinguishing bomb is provided with a gas cylinder, a bottle stopper, a gas cylinder solid joint piece, a control sheet, an axle, a steel ball, a starting piece, a control sleeve, a shearing pin, a spring, a delay electric detonator case, a sheath, a gas cylinder case, an ejector sleeve and a tail hood, wherein the gas cylinder solid joint piece is fixedly connected with the gas cylinder and is provided with an axle hole which is matched with the axle; the control sheet supports and tightly presses the bottle stopper by the axle and the steel ball; high-pressure air is injected into the gas cylinder by the bottle stopper in advance; the starting piece is fixedly connected with the cylinder solid joint piece; the front part of the starting piece contacts with the spring; the delay electric detonator case is connected with the gas cylinder case; the starting piece is connected with a control sleeve by the shearing pin; the shearing pins corresponding to the starting piece and the control sleeve are concentric; a steel ball sliding-out hole arranged on the control sleeve deviates to the gas cylinder relatively to the starting piece steel hole; the ejector sleeve is arranged behind the gas cylinder; and the tail cover is arranged on the tail part of the ejector sleeve.

The invention provides a natural gas pipeline leakage monitoring method based on optical fiber sensing. Optical interference type leakage sensors are arranged on a pipeline body at certain intervals to continuously monitor a vibration wave signal in real time, which is transmitted along the pipeline body; the collected vibration wave signal is subjected to analysis and process, including type identification and vibration source positioning; the type identification is used for extracting and analyzing a vibration wave characteristic to judge whether the vibration wave characteristic belongs to a leakage type; meanwhile, time delaying of transmitting vibration waves to adjacent optical fiber sensors is combined with a transmission speed of the vibration waves on the pipeline body to realize the positioning of a vibration wave source; and each sensor adopts an optical fiber interferometer structure, and an optical fiber Michelson interferometer or an optical fiber Mach-Zehnder Interferometer is used as a leakage vibration wave detection sensor. The natural gas pipeline leakage monitoring method based on the optical fiber sensing has high sensitivity and high positioning accuracy.

The invention provides a pump-driven two-phase circuit device for heat dissipation of a high heat flux electronic device. Heat is collected and transported by using an endothermic process in evaporation and an exothermic process in condensation during a circulation flow process of a working medium. An evaporator for the circuit device comprises micro-channels and fins. In an area of high heat flux, the micro-channels are used to dissipate heat and increase a heat transfer coefficient of a partial area, while in an area of low heat flux, the fins are used. Due to great area difference between the micro-channel area and the fin area in the evaporator, when the working medium in the micro-channels enters the fin area, volume quickly expands and temperature of the working medium reduces, so as to help heat dissipation of the device in the fin area. By using different structures and with little resources, heat dissipation problems of devices with different powers are solved. The pump-driven two-phase circuit device for heat dissipation of the high heat flux electronic device can adapt to heat dissipation of electronic devices with different heat flux densities and can satisfy working requirements of electronic devices with a heat flux density of 50 W/cm<2> or above.

The invention discloses an improved Transformer + CRF-based method for recognizing a named entity of Lambda language, and belongs to the field of recognition of small languages in natural language processing. According to the method, an improved Transformer model is adopted to encode the Lao language, and then a CRF (Conditional Random Field) model is adopted to decode the Lao language to obtain an optimal annotation sequence. The method comprises the following steps: firstly, taking Transformer as a character encoder to carry out character encoding on a single character of the Lambda language; splicing the character-level vector obtained by encoding with a pre-trained word vector and carrying out position encoding; wherein the input signal is used as the input of a Transformer encoding part; through training of a multi-head attention layer and a feedforward neural network layer in sequence, finally, an obtained vector set is input into a CRF model fused with old-age naming and geographical name institution name linguistic features for named entity recognition training, and a named entity recognition model fused with old-age language rules is obtained. Compared with a mainstream BLSTM + CRF named entity recognition method, the recognition effect of the method is improved.

The invention discloses a reference-system-independent plug-and-play double-field quantum key distribution protocol implementation method, and solves the problems of inconsistent preparation of double light sources, misalignment of reference systems, incapability of automatically compensating phase and polarization and incapability of breaking through the SKC limit in an existing QKD protocol system. The method comprises the following implementation steps that: a single light source quantum key distribution system is constructed; a communication user monitors, modulates and encodes the optical pulse; the third-party Charlie performs Bell state measurement of photons and discloses a result; alice and Bob of communication users screen keys and carry out parameter estimation; and post-processing on the secret key is finally carried out. According to the invention, a double-field quantum key distribution system in which a single light source generates light pulses is constructed, a plug-and-play structure is combined in the system, an RFI protocol irrelevant to a reference system is applied, two communication users do not need to align the reference system, and phase and polarization compensation is automatically carried out, so that the complexity of a protocol system is reduced, the range of secure communication is expanded, and the method is used for quantum communication.