168results about How to "Realize simple structure" patented technology

A light emitting device and a projection display device are provided. The light emitting device comprises a laser light source used for emitting original laser light, and further comprises a light splitting device and a light condensing device disposed at the rear end of the light path of the light splitting device. The light splitting device includes an import area and an export area. The light emitting device further comprises a wavelength conversion device. The wavelength conversion device includes a wavelength conversion section and a reflection and scattering section. The wavelength conversion section includes a reflection layer and a wavelength conversion layer covering the surface of the reflection layer. The wavelength conversion device further includes a functional light filter covering the surface of the wavelength conversion layer and a driving device. The import area of the light splitting device reflects laser light, the export area transmits laser light, and both the import area and the export area transmit excited light. Through cooperation of the two areas of the light splitting device and the functional light filter, first scattered laser light emitted from the wavelength conversion section is successfully suppressed and cannot be emitted out, and most of second scattered laser light emitted from the reflection and scattering section can be emitted out.

The invention discloses a broadband dual-polarized antenna unit, which is used for realizing broader band characteristic. A radiating element comprises a reflective plate, a main radiating body, an upper insulating block, a lower insulating block and a balance feed device, wherein the main radiating body comprises a support body and radiating pieces; four radiating pieces and the support body form a whole, and the four radiating pieces respectively form an angle of 90 degrees with the support body; the outline of each radiating piece has a 90-degree fan shape; each radiating piece is provided with a hollowed structure and a loading section used for broadening the bandwidth and improving polarization purity; a clearance between two adjacent radiating pieces is less than 0.1 wavelength; and the radiating element adopts coupling balance feed and an integrated design that four support body bottoms are mutually short-circuited, and is fixed on the reflective plate. The broadband dual-polarized antenna unit has impedance bandwidth of over 45 percent, and has the advantages of small size, simple structure, a few components, convenience for assembly, easy production, low cost and the like.

The invention provides a frequency selection surface structure based on a stereo structure, relates to the frequency selection surface structure and solves the problems that an existing frequency selection surface of a simple structure has fewer controllable parameters and is small in gradient of a frequency response curve, poor in polarization stability and poor in miniaturization in practical application. According to the invention, four No.1 medium plates are perpendicularly spliced to form a rectangular frame, a metal film layer is coated on the inner side wall of the rectangular frame, circular through holes are formed in the No.1 medium plates, and the a metal film layer is coated on the inner side of each circular through hole; and two No.2 medium plates are respectively arranged in the rectangular frame, one pair of opposite edges of each No.2 medium plate is fixedly connected with the inner side wall of the rectangular frame, the two No.2 medium plates are perpendicularly connected along a center line to form a cross structure, metal film strips are respectively arranged on the lower surface of a left arm, the upper surface of a right arm, the left side surface of an upper arm and the right side surface of the lower arm of the cross resonance structure. The frequency selection surface structure is applicable to manufacturing and usage of an antenna cover.

The application discloses vehicle-mounted movable telescopic rail type charging and battery replacing equipment, which relates to the technical field of new energy. The equipment comprises a chassis,a cart mechanism and a battery replacing mechanism. A battery pack base is arranged on the chassis, and a rail extending in the length direction of the chassis is arranged on the chassis. The cart mechanism comprises a cart body and a walking device, the cart body is movably arranged on the rail, and the walking device is connected with the cart mechanism and drives the cart mechanism to move along the rail. The battery replacing mechanism is arranged on the cart mechanism and comprises a telescopic device stretching out and drawing back in the direction perpendicular to the rail and a liftingappliance device arranged on the telescopic device, and the lifting appliance device is connected with a gripping apparatus. According to the charging and battery replacing equipment, a conventionally used battery pack base is installed on the chassis, and the problems that a fixed charging station is large in occupied area, needs capital construction and is high in cost are solved. In addition,the battery replacing equipment can be moved to a unified station for centralized management, and the problems that the charging piles are distributed disorderly and are inconvenient to maintain are solved.

The invention claims to protect a chaotic circuit and its realization method for generating multi-surrounding coil waves, and relates to a chaotic circuit in secure communication. The chaotic circuit is composed of four parts: fourth-order autonomous circuit N1, adding amplifier N2, piecewise function sequence generator N3 and inverting amplifier N4. The piecewise function sequence generator constructs the piecewise function of the turning point, creates sub-circuits, and controls the number of coils generated by the chaotic circuit in the V2 and V3 directions; by adjusting the Rncc value of the piecewise function sequence generator, the volume of the scroll is adjusted. size. The circuit design method of the present invention is simple, the chaotic signal generation circuit is flexible, and can provide a random number of chaotic signal circuits with continuous coils around the coils. The number of coils around the coils can be controlled by switching the linkage switch, and two coils around the coils, respectively, can be generated. Three-surrounding wire coil wave, etc., and has good performance, and can be widely used in secure communication.

The invention, which belongs to the technical fields of the intelligent networking vehicle and vehicle-road coordination, provides a cloud-service-based green-wave vehicle speed guidance method and system of light-controlled intersection. The system is composed of a cloud server, a signal light data acquisition device, and an intelligent networking vehicle client, wherein the signal light data acquisition device and the intelligent networking vehicle client are connected with the cloud server respectively. In addition, according to the method, signal light configuration and real-time state data are collected; the collected data are uploaded to the cloud server in real time and the corresponding data are stored in a database; on the basis of signal light data stored in the database, the cloud server generates signal light state data and green-wave vehicle speed guidance service data based on a client request and sends the data to the client; and the client receives the data and then displays the data for a user by an intelligent mobile terminal. Therefore, the system structure of the green-wave vehicle speed guidance application of the light-controlled intersection is simplified; the communication requirement and the computing capability requirement of the system equipment are reduced; air interface communication resources are saved; and the application deployment and promotion costs are reduced.

The invention provides a digital-shaping filtering method for a continuous and variable speed. The digital-shaping filtering method for the continuous and variable speed comprises the steps that (1) a one-time data clock signal A1 and an N-time data clock signal AN are generated through a digital NCO, (2) an input signal is received according to the data clock signal A1, (3) N-time zero-fill interpolation is conducted on the received signal by means of the data clock signal AN, (4) the signal subjected to interpolation is filtered by means of a digital shaping filter, and (5) variable-sampling-rate interpolation filtering is conducted on the signal subjected to shaping filtering. According to the continuous variable-speed digital-shaping filtering method, the shaping filter with the fixed coefficient and an interpolation filter with a variable coefficient are used for shaping filtering and interpolation filtering respectively, shaping filtering and interpolation filtering of different speed signals can be achieved, the method can be applied to a digital modulator with continuous and variable data speed, the filtering method is easy to realize, hardware resource consumption is low, and practicability is high.

The invention relates and discloses an interpolating digital filter device which is applied to a wireless medium range sensor network physical layer, comprising an interpolating digital filter module based on FIR (Finite impulse response filter) and an interpolating digital filter module based on CIC (Cascaded integrator-comb filter). The interpolating digital filter module based on FIR comprises a shift register time delay module, a multiplication module, a coefficient selector module, and an accumulator module. Wherein, the accumulator module comprises a register module and an adder module. The interpolating digital filter module based on CIC comprises a pectinate unit module, an interpolating unit module and an integral unit module. The invention is characterized in occupying less hardware resource, being applied to higher system clock rate, smaller passband ripple, more stopband attenuation and so on. The invention is applicable to a broadband wireless transceiver, in particular to a wireless broadband transmission system based on OFDM (Orthogonal Frequency Division Multiplexing) in the mobile environment.

The invention relates to a micro-mechanical gyroscope, in particular to an electromagnet driven gyroscope based on a nanometer film quantum tunneling effect, solving the problem of the existing micro-mechanical gyroscope that an applied drive mode, an applied detection mode and the structures corresponding to the drive mode and the detection mode limit the performance of the gyroscope to be further improved. The gyroscope comprises a carrier plate embedded with a permanent magnet and a gyroscope tube core, wherein the gyroscope tube core is internally enveloped with a gyroscope sensitive mechanism which comprises a support frame body, a glass base plate, a composite beam and a mass block; the composite beam is formed by a detection beam and pentacle-shaped drive beams symmetrically positioned at the two sides of the detection beam; the connection place between the detection beam and support frame body is provided with a nanometer film quantum tunneling apparatus; the mass block is provided with a feedback lead wire and a drive lead wire; a connection lead wire at the two ends of the feedback lead wire and the drive lead wire, which is positioned along the composite beam, is connected with a lead wire pad corresponding to the support frame body. The gyroscope has simple, rescannable and compact structure, is suitable for microminiaturization, and greatly improves performance parameters such as sensitivity, and the like, compared with the existing micro gyroscope.

The invention relates to a wireless communication carrier tracking method based on FFT-assisted S-PLL. In a high-speed mobile carrier wireless communication system, the carrier tracking method based on a fast Fourier transform-assisted second-order phase-locked loop can solve the problem of large-scale DPP For the wireless communication receiving problem under the condition of Le frequency offset, under the condition that the sampling frequency satisfies the Nyquist sampling theorem, the rough position of the signal frequency is quickly obtained through FFT, and the S-PLL is further used to realize accurate frequency offset estimation. This method makes full use of the frequency offset estimation characteristics of FFT and PLL, can overcome the influence of large-scale Doppler frequency offset and signal noise, and can track large dynamic carrier frequency offset; on the other hand, the method has a simple structure , with lower complexity and stronger practicability.

The invention discloses a specific harmonic cancellation multi-level radio frequency pulse width modulation method in which K odd number of specific harmonic waves are selected, and M-level RF-PWM signals are processed to be equivalent to N 3-level RF-PWM signals with pulse width separately controlled by corresponding comparison thresholds and stacked in a weighted manner, wherein K, M and N are all integers more than 0, N is more than K, and M is equal to 2N+1; N comparison thresholds and corresponding weighting coefficients are controlled in real time according to a normalized envelope signal SA, so that the K specific harmonic wave components of the N 3-level RF-PWM signals has stacked in a weighted manner are mutually counteracted, a base wave component is in direct proportion to the SA, and thus the K specific harmonic waves and integer multiples of odd harmonic waves of the M-level RF-PWM signals are eliminated. Based on the method, the invention also provides a specific harmoniccancellation multi-level radio frequency pulse width modulator. Compared with the prior art, the modulation method and the modulator have the beneficial effects that on the basis that the basic modulation performance is equivalent to the RF-PWM of the same level in the prior art, the suppression requirement on the filter is effectively reduced, the cost and size of the filter are reduced, and thus the comprehensive performance of the wide frequency band DTX is improved.

The invention provides a bilateral CORDIC arithmetic unit, and a parallel Jacobian Hermite matrix characteristic decomposition method and an implementation circuit based on the bilateral CORDIC arithmetic unit. The parallel bilateral CORDIC arithmetic unit is of a six-input and four-output structure. Two times of unilateral CORDIC operation conversion are finished in one-time operation. Meanwhile, the bilateral CORDIC structure can enlarge the angle range of unilateral CORDIC operation from [-pi / 2, pi / 2) to [-pi, pi) by one time, and reuse of the same circuit structure in the realification process and the diagonalization process of a complex matrix can be possible. The bilateral CORDIC arithmetic unit, and the Hermite matrix characteristic decomposition method and the implementation circuit achieved by utilizing the bilateral CORDIC arithmetic unit can effectively reduce circuit operation time delay, reduce hardware resource consumption and improve operation precision of the circuit through unified factor rectification.

The invention discloses an L-waveband broadband multi-zero micro-filter. The L-waveband broadband multi-zero micro-filter comprises an input / output interface mounted on the surface, five parallel resonant units realized by adopting three layers of folding coupling strip lines, four zero setting units, a Z-shaped cross-coupling circuit, and input and output inductors, wherein each element is realized by adopting the technique of three layers of low-temperature co-fired ceramic, and the input and output inductors are designed based on strip lines of distributed parameters. According to the L-waveband broadband multi-zero micro-filter disclosed by the invention, the design process of the circuit topology is simple, the manufacturing process is simple and convenient, the working band is wide, the insertion loss is low, the chip is small, the phase-shifting precision is high, and the standing wave ratio of the input voltage to the output voltage is small. The L-waveband broadband multi-zero micro-filter specially applies to communication of related microwave frequency bands, the digital radar, individual satellite mobile, military and civilian multi-mode and multi-way communication system terminals, wireless communication handhold terminals, as well as related systems with harsh requirements in volume, weight, performance and reliability.

The invention relates to a light motion assisting device and a control method thereof. The light motion assisting device includes a power system, a control system and an execution mechanism; the execution mechanism includes a connection rod structure and a sensor group, which match and bear a lower limb of a human body; the sensor group includes a human body pressure monitoring system for monitoring the pressure acted on a foot of the human body, and a mechanical pressure monitoring system for monitoring the pressure acted on the connection rod structure, wherein the human body pressure monitoring system and the mechanical pressure monitoring system output signals to the control system respectively; the control system outputs a control signal to the power system; and the power system drives the connection rod structure to match the human body to move, and then a loop control system is formed. The actual load of the human body and the device assisting load can be measured timely, the changing trend of the pressured acted on the human body can be monitored timely, and the motion assisting device is controlled to do a control action; and all the states of motion of the human body can be included, and the motion assisting device can timely and rapidly make a response and cannot be triggered wrongly.

The invention discloses a method for implementing a charge pump keeping constant output current, and the charge pump thereof. The method comprises the following steps of: comparing external input voltage of a charge pump main body circuit with reference voltage, and inputting a comparison result into a clock generating circuit to output corresponding clock oscillation frequency, so that the charge pump main body circuit outputs constant current. The output of the charge pump main body circuit is connected to an enable end of the charge pump main body circuit through a voltage feedback and comparison circuit. The external voltage is dynamically detected, and when the external voltage changes, corresponding clock oscillation frequency can be selected according to the external input voltage,so that the charge pump outputs constant current. Therefore, the output voltage ripple of the charge pump is reduced, and the output voltage stability is improved. The charge pump is simple in implementation mode and structure and low in cost.

The invention discloses a miniature microwave and millimeter wave self-load I / Q (In-phase / Quadrature) filter which comprises a microwave and millimeter wave filter in a strip line structure and a directional coupler connected with a matched load, wherein the microwave and millimeter wave filter comprises a surface-mounted input interface, and six-stage parallel resonance units realized in strip line structures; the directional coupler connected with the matched load comprises a surface-mounted output interface, wide side coupling strip lines in double spiral structures, and a matched load connected at an isolation port; and the structures are realized by a multi-layer low-temperature co-fired ceramic technology. The filter has the advantages that external load connection is not required; a quadrature phase can be generated; and the filter is easy to debug, low in insertion loss, light in weight, small in size, high in reliability, good in electrical property, good in temperature stability, good in electrical property batch consistency and low in cost, and facilitates large-batch production. The filter is applicable to occasions and corresponding systems with strict requirements for the size, the electrical property, the temperature stability and the reliability, such as corresponding millimeter wave band communication and satellite communication.

The invention discloses a vertical force floating powder laying scraper device. The technical problems in the process that a scraper avoids nodulizing protruding points of defects on a selective laser sintering surface in the prior art are solved. According to the technical scheme, the vertical force floating powder laying scraper device is characterized by comprising a scraper support externally connected with a drive source and a scraper connected between the scraper support and a powder bed; the end, close to the scraper, of the scraper support is provided with a floating scraper frame; the scraper is rotationally connected to the floating scraper frame; and when the scraper meets sintering defect protruding points in the powder laying direction, the floating scraper frame drives the central axis of the upper end face of the scraper to swing to bypass the sintering defect protruding points, and the technical effects that the scraper rotates to avoid the protruding points on the powder bed, a movement member causing destructiveness to structural functions due to direction collisions, shearing and the like of the scraper and the sintering defect protruding points is avoided, the critical defects that powder laying is uneven, a powder laying bed is loosened, and defects are moved backwards and transferred in other scraper powder laying manners are overcome, the yield of products is greatly increased, the mechanism is simple, and occupied space is small are achieved.

The invention provides a method for achieving FPGA digital signal processing based on a segmented lookup trigonometric function. The method for achieving the FPGA digital signal processing based on the segmented lookup trigonometric function comprises the following steps: dividing FPGA into 3 parts including an index value calculation module, a trigonometric function lookup table, and a linear interpolation module, wherein the trigonometric function lookup table includes correspondences among angles and trigonometric functions and is fixed in ROM storage resources of the FPGA; calculating an index position in the corresponding trigonometric function lookup table by the index value calculation module based on the inputted angle value; applying a linear interpolation to the trigonometric function value obtained from looking up the table by the linear interpolation module for obtaining a trigonometric function calculation value having a higher precision. In the method for achieving the FPGA digital signal processing based on the segmented lookup trigonometric function, the contradiction of calculating the trigonometric function value precision and the lookup table depth by the FPGA is solved by the segmented lookup, thereby saving the limited storage space of the FPGA.

The invention provides a design method of an integrated compensation digital filter. The design method comprises the following steps: step (1), designing a filter coefficient, and taking into accountthe completion of the suppression of down-conversion high-frequency components, the matching of a transmitting end shaping filter and the anti-aliasing filtering for the variable rate processing; step(2), after the filter coefficient is recombined, storing the filter coefficient, wherein the recombination method is adapted to different rates as much as possible, and the implementation of parallel calculation is easy; step (3), calculating the effective data length participating in operation and the number of data carrying out sample data recovery, and completing a corresponding filter multiplexing operation; step (4), completing compensation by utilizing residual deviation information obtained by bit timing, wherein the compensation comprises two parts: the compensation of coefficients participating in a filtering operation and the compensation of input data; and step (5), according to the adjusted coefficient and data, completing the calculation of a final filtering result by adopting a parallel and pipelined hybrid implementation mode.

The invention provides a FTN (Faster than Nyquist) block transmission method based on DFT (Discrete Fourier Transform), a transmitter, a receiver and a system. Based on DFT and frequency domain windowing technologies, a conventional waveform generating and receiving matched filtering mode based on time domain convolution is equivalently implemented, and then by simple frequency domain equalization, channel multipath interference and self ISI (Inter-symbol interference) are eliminated in steps, so that an implementing structure for base band processing of a transmitting terminal and a receiving terminal is simplified. In addition, by further utilizing high efficiency of DFT calculation, according to the invention, an effect of effectively reducing implementation complexity of the transmitter and the receiver of the system can be achieved.

The invention provides a filter comprising an input port, an output port, a shield case, a medium, at least two layers of half-wavelength resonant cells, at least one layer of quarter-wavelength resonant cell, and at least three layer of grounded resonant cells. The half-wavelength resonant cells and the quarter-wavelength resonant cell are connected in parallel between the input port and the output port. The input port is connected with the first layer of half-wavelength resonant cell, and the output port is connected with the last layer of half-wavelength resonant cell. Each half-wavelength resonant cell is suspended at both ends. One end of the quarter-wavelength resonant cell is grounded through the shield case, and the other end is suspended. The grounded resonant cells surround the half-wavelength resonant cells and the quarter-wavelength resonant cell respectively. Inner sides of the grounded resonant cells are suspended and outer sides are grounded through the shield case. The invention also provides a filtering method.

The invention discloses a button switch structure for elevators, comprising a printed board assembly, a bottom shell part, a button part and a fastener part. The printed board assembly is fixed at the bottom of the bottom shell part, and is used for controlling action of an elevator and emitting light. The bottom shell part includes a first waterproof sealing member and a shell body, the shell body is provided with an inner cavity used for accommodating and fixing the button part, and the shell body is provided with a transparent cover in which a light source of the printed board assembly can be arranged. The button part is used for accepting pressing action of a user and receiving and reflecting light. The fastener part includes a second waterproof sealing member and a fastener body which is nested onto the button part and is connected with the shell body. The first waterproof sealing member is mounted on the contact surface of the bottom shell part and the fastener part, and is used for preventing water flowing in from between the fastener part and the button part from flowing out of the button switch. The second waterproof sealing member is mounted between the fastener part and a switch panel, and is used for preventing water flowing in from the hole of the switch panel from flowing out of the button switch. The button switch structure for elevators has the advantages of simple structure, easy installation and low cost. The button switch structure is waterproof, and the luminescence property and operation hand feel of the button are improved.

The invention discloses a digital pulse width modulator based on IODELAY firmware. The digital pulse width modulator consists of a clock generation module, a synchronous counting module, an IODELAY firmware module and an asynchronous signal generation module. After carrying out frequency multiplication on an input clock signal, the clock generation module generates a basic clock signal and inputs the basic clock signal to the synchronous counting module and the IODELAY firmware module; the synchronous counting module generates a coarse control signal and an initial control signal and respectively inputs the coarse control signal and the initial control signal into the IODELAY firmware module and the asynchronous signal generation module; the IODELAY firmware module carries out delay on the coarse control signal, generates a corresponding termination control signal and then inputs the termination control signal into the asynchronous signal generation module; and in the asynchronous signal generation module, the termination control signal and the initial control signal are processed by an RS trigger to output a final digital pulse width modulation signal. According to the digital pulse width modulator disclosed by the invention, the coarse control signal is subjected to phase delay by the IODELAY module, so that more accurate digital pulse width modulation can be implemented; and the digital pulse width modulator has high accuracy, universality and applicability.

The present invention discloses a multi-channel micro pump device and driving method thereof. The device comprises at least one microflow transport channel to transmit liquid, and at least three extrusion microflow channels to drive liquid in microflow transport channel flowing along prearranged direction; the extrusion microflow channels distribute the side of microflow transport channel to form two layers on it and cross corresponding and superpose partially. The multi-channel micro pump device and driving method of the present invention employs superposition and cross a plurality of extrusion microflow channels extract from side in turn, ensures the liquid in extrusion microflow transport channel can be extracted and transmitted in turn, the structure of which is simple and the requirement of liquid transport capacity is reached.

The invention discloses a method for sending messages with random length precisely according to a traffic model. The method generates random numbers within a designated range through a universal PRBS generating circuit and a DSP hardcore resource in FPGA. The random numbers act as the length of to-be-sent messages. Two accumulators are used to perform real-time computing on reciprocal values of the rates of the messages stored in message rate control FIFO in advance to obtain a message interval corresponding to each to-be-sent message. At last, a message sending controller outputs message packaging control enable signals according to requirements of the length of the to-be-sent messages and the message intervals, and precise control of sending rates of the messages with random length according with the given traffic model is achieved. According to the method, the message sending rate can be precisely controlled to a level of a clock period, the achievement is simple, the timing sequence can be converged easily, and the resource usage rate is low.

The invention discloses a power equalization method and a modulator for modulation of a specific harmonic elimination multilevel radio frequency pulse width. The method comprises the steps of: decomposing a specific harmonic elimination multi-level RF-PWM signal into a plurality of 3-level RF-PWM signals with equal pulse areas by using the area equivalence principle based on a multi-level radio frequency pulse signal output from the specific harmonic elimination multi-level RF-PWM, according to the rise and fall of the pulse outputting the multi-level RF-PWM signal; driving a rear-stage SMPA unit, so that multi-level RF-PWM output pulse sequence specific harmonics are eliminated, while achieving the power equalization between the rear-stage SMPA units and between the power tubes in the unit. The radio frequency pulse width modulator is based on the power equalization method, and generates a phase shift control signal for driving a rear-stage 5-level SMPA unit by using a digital delay line unit, thereby realizing active cancellation of a 3X times specific harmonic. The power equalization method for modulation of a specific harmonic elimination multilevel radio frequency pulse widthdoes not need an additional power equalization control circuit, which simplifies the modulator structure.

The invention provides a high-speed parallel OQPSK demodulation clock restoring system which comprises a parallel delay module, a parallel interpolation calculation module, a parallel clock error extraction module, a parallel threshold calculation module and a parallel interpolation coefficient generation module. New 4AR channel parallel Q' channel data are formed after the parallel delay module delays for T / 2 to 4AR channel parallel Q channel data in 4AR channel base-band data output by matched filtering. The new 4AR channel parallel Q' channel data and original 4AR channel parallel I channel data are taken into the parallel interpolation calculation module. The obtained 4AR channel data after interpolation are sent to the parallel clock error extraction module to obtain parallel clock errors epsilon T. Meanwhile, the threshold value is obtained by carrying out clock locking indication calculating and integral accumulating on the parallel data after the interpolation, the epsilon T is sent to the parallel interpolation coefficient generation module after parallel low-pass filtering is carried out, and the new generated 4AR channel interpolation coefficient is fed back to the parallel interpolation calculation module. After the threshold reaches a stable value and a clock loop is locked, the parallel interpolation calculation module outputs the maximum value of the data to restore a clock.

The embodiment of the invention provides a clock synchronization method, device and equipment for Internet of Things equipment, and the method comprises the steps: receiving synchronization information transmitted by a cloud server, and recording the first receiving time when the synchronization information is received; determining a time difference between the time of the Internet of Things device and the time of the cloud server; and performing clock synchronization on the Internet of Things device and the cloud server according to the first receiving time and the time difference. The methodcomprises the following steps: recording first receiving time for receiving synchronization information; determining a time difference between the Internet of Things device and a cloud server, performing clock synchronization on the Internet of Things equipment and the cloud server according to the first receiving time and the time difference; the accuracy of clock synchronization of the Internetof Things device and the cloud server can be ensured without adding an additional communication protocol module to the Internet of Things device or enabling the Internet of Things device to communicate with the third-party clock server, the time synchronization requirement of the Internet of Things device is met, and meanwhile, the implementation structure is greatly simplified.