119results about How to "Guaranteed range" patented technology

The invention discloses a whole vehicle energy management method for an internal combustion generating extend range type electric vehicle. The SOC level of a current electric vehicle storage battery is obtained according to voltage and charging and discharging current information of the two ends of the storage battery, a high SOC threshold and a low SOC threshold are set to determine the on-off state of a range extender, and excessive charging and discharging of the storage battery and frequent start and stop of the range extender are avoided. In a range extend mode, drive demanded power of the whole vehicle is obtained according to discharge voltage and current information of a drive motor and a controller of the drive motor, an economic travel line of an internal combustion engine of the range extender and the current SOC value of the storage battery serve as bases, the optimal operation condition of the range extender is reasonably determined, charging and discharging demands of the storage battery are taken into consideration, accordingly whole vehicle dynamic performance and fuel economical efficiency are guaranteed, and meanwhile the energy storage level of the storage battery is optimized.

The invention discloses a control method and device for a cooling water pump and a vehicle. The control method comprises the following steps that the driving motor temperature, the motor controller temperature and the temperature of cooling liquid at a water inflow opening of a driving motor are collected; according to the maximum value among the driving motor temperature, the motor controller temperature and the cooling liquid temperature and the target temperature, the temperature difference and the temperature difference change rate between the maximum value and the target temperature are obtained; and according to the preset fuzzy control rule as well as the temperature difference and the temperature difference change rate between the maximum value and the target temperature, the rotary speed of the cooling water pump is controlled. According to the control method, the rotary speed of the cooling water pump can be adjusted in real time to achieve the purpose of energy conservation, energy resources are saved, the endurance mileage of the vehicle is ensured, the control accuracy can be improved, and the reliability of the vehicle is improved.

The invention provides a quartz flexure accelerometer which can improve the measurement precision, is good in sealing performance, and is high in stability. The accelerometer comprises a servo circuit and a meter. The meter comprises an upper torquer, a detection quality assembly, a lower torquer, and a housing. The upper torquer comprises a compensation ring, a magnetic steel, a magnetic pole piece, and an upper yoke. The lower torquer comprises a compensation ring, a magnetic ring, a magnetic pole piece, and a lower yoke. The detection quality assembly comprises a gold-plated film quartz pendulous reed and two torquer coils which are pasted on the quartz pendulous reed.

The invention provides a dual-mode voltage-controlled oscillator (DMVCO), a frequency synthesizer and a wireless receiving device, and pertains to the technical field of integrated circuit of radio frequency wireless receiver. The DMVCO and the frequency synthesizer can operate in a wideband mode and a quadrature mode. When operating in the quadrature mode, a quadrature signal is provided for a Single Sideband Mixer of the frequency synthesizer by a quadrature coupling of a first voltage-controlled oscillator unit and a second voltage-controlled oscillator unit in the DMVCO in the overlapped frequency band so that the frequency synthesizer can cover a higher output frequency band. Therefore, the tuning range of the DMVCO of the invention is wide, and the frequency synthesizer using the DMVCO is low in power consumption, simple in structure and has good frequency spur performance.

The invention provides a W flame boiler of a turbulent burner with an inner direct flow and outer turbulent flow ammonia spraying device and relates to the W flame boiler. The W flame boiler solves the problems that an existing W flame boiler of the turbulent burner is high in NOx discharge amount and low in denitrifying efficiency. The center of a first stage ammonia spraying device is placed atthe upper edge of a front furnace arch or a back furnace arch, the distance L from the center line of a second stage ammonia spraying device to the upper edge of the front furnace arch or the back furnace arch is 1-2m, the center of the first stage ammonia spraying device is located in a same horizontal plane, and the center of the second stage ammonia spraying device is located on a same horizontal plane; the first stage ammonia spraying device and the second stage ammonia spraying device comprise inner tubes, outer rubes and a plurality of turbulent blades, the inner tubes and the outer tubes are arranged coaxially, the plurality of turbulent blades are uniformly distributed between the inner tubes and the outer tubes, the inner tubes are direct flow nozzles, and the plurality of turbulent blades arranged between the outer tubes and the inner tubes are turbulent nozzles which form the ammonia spraying device with an inner direct flow and an outer turbulent flow. The W flame boiler provided by the invention belongs to the technical field of NOx emission reduction.

The invention belongs to a heat balance management device for a power battery pack and a management method of the heat balance management device. The heat balance management device comprises a power battery pack device and a power battery pack management system, wherein the power battery pack device comprises a battery box body, a storage liquid cooling device, a water suction pump and vehicle low-voltage power supply; a battery pack and a cooling device are arranged in the battery box body; the power battery pack management system comprises a humidity sensor and a temperature sensor, which are arranged in the battery box body; a communication module is arranged in charging equipment; the humidity sensor, the temperature sensor and the communication module are respectively connected with a battery management system; and the battery management system is connected with a whole vehicle controller. The heat balance management device has the advantages of simple structure, reasonable design and high controllability; and the safe service environment of the battery pack can be effectively and reliably ensured to prolong the service life; therefore, the safety and the reliability of an electric automobile are improved; the application range is expanded; and the endurance mileage is ensured.

The invention relates to the distributed optical fiber sensing technique, in particular to a distributed optical fiber multi-parameter sensing measurement system. The distributed optical fiber multi-parameter sensing measurement system solves the problem that according to an existing distributed optical fiber sensor, vibration information of sensing optical fibers can not be monitored. The distributed optical fiber multi-parameter sensing measurement system comprises a super-narrow-linewidth high-power optical fiber laser, a first 1*2 optical coupler, a single-side-band carrier suppression modulator, a second 1*2 optical coupler, a third 1*2 optical coupler, an electrooptical modulator, a first 2*1 optical coupler, a scrambler, an integrated wavelength division multiplexer, sensing optical fibers, a full-optical-fiber narrow-band low-noise Brillouin frequency shift, a narrow-band fiber bragg grating transmission filter, a second 2*1 optical coupler, a third 2*1 optical coupler, a first low-bandwidth high-gain photoelectric detector, a second low-bandwidth high-gain photoelectric detector and a data acquisition processing system. The distributed optical fiber multi-parameter sensing measurement system is suitable for various measurement fields.

The invention provides a changeable battery control system for an electric automobile and belongs to the technical field of electric automobile battery changing. The problems that the power capacity of a fixedly arranged battery pack is hard to guarantee and the battery life cannot be rapidly prolonged in the prior art are solved. The changeable battery control system for the electric automobile comprises a controller, an electronic switch module, a detachable first battery pack, a fixed second battery pack, a first charging module, a charging port and a discharging port; and through the electronic switch module, the discharging port is supplied with power by using the first battery pack and / or the second battery pack. The changeable battery control system for the electric automobile further comprises a second charging module; the second charging module is supplied with power by using the first battery pack and used for charging the second battery pack; and the controller is used for controlling the second charging module and the electronic switch module. According to the changeable battery control system for the electric automobile, the power capacity in the fixedly arranged battery pack is preferentially kept.

This invention relates to a calibration network of an intelligent antenna including a metal plate opened with multi-set of couple windows, transmission lines above the metal plate corresponding to the couple windows, transmission lines below the metal plate and a power distributor circuit, the transmission lines above or below the plate and the corresponding windows make up of a coupler, all the branches of the power distributor are connected with the transmission lines under the metal plate, which can guarantee the consistency of the amplitudes and phases from the calibration port to the antenna port.

The invention provides a dual-mode voltage-controlled oscillator (DMVCO), a frequency synthesizer and a wireless receiving device, and pertains to the technical field of integrated circuit of radio frequency wireless receiver. The DMVCO and the frequency synthesizer can operate in a wideband mode and a quadrature mode. When operating in the quadrature mode, a quadrature signal is provided for a Single Sideband Mixer of the frequency synthesizer by a quadrature coupling of a first voltage-controlled oscillator unit and a second voltage-controlled oscillator unit in the DMVCO in the overlapped frequency band so that the frequency synthesizer can cover a higher output frequency band. Therefore, the tuning range of the DMVCO of the invention is wide, and the frequency synthesizer using the DMVCO is low in power consumption, simple in structure and has good frequency spur performance.

The invention discloses a helicopter-mounted high-pressure water-saving fire-extinguishing water cannon used for fighting electric transmission line mountain fires. The helicopter-mounted high-pressure water-saving fire water cannon comprises a gas supply mechanism, a water supply mechanism, a high-pressure gas chamber, a cannon bore, a cannon barrel, an infrared imager and a control box, wherein the gas supply mechanism is installed in a belly of a helicopter; the gas supply mechanism is communicated with the high-pressure gas chamber positioned below the belly; the cannon bore, the cannon barrel and the infrared imager are all installed below the belly; the high-pressure gas chamber is communicated with the cannon bore and separated by a gas chamber electromagnetic valve; the cannon bore and the cannon barrel are communicated and are separated by a cannon bore electromagnetic valve; the cannon bore is connected with the water supply mechanism installed in the belly; the control box is respectively connected with the gas supply mechanism, the water supply mechanism, the infrared imager, the gas chamber electromagnetic valve and the cannon bore electromagnetic valve. By utilizing the helicopter-mounted high-pressure water-saving fire water cannon, the small curvature spiral cannon barrel is adopted, the atomization effect of fire extinguishing liquid is good, the fire extinguishing liquid is saved on the premise of ensuring the fire extinguishing effect, and the problem that the lack of a large-scale water source needed by water drawing of the helicopter in a field is effectively solved.

The invention discloses a multicode grating ruler, a measurement device and a data processing method. The grating ruler comprises a first grating code track, a second grating code track, a linear gradual change optical filter code track, two grating reading heads and a gradual change sheet reading head, wherein the three code tracks are arranged side by side in parallel, the two grating reading heads are arranged to be opposite to the first grating code track and the second grating code track, the gradual change sheet reading head is arranged to be opposite to the linear gradual change optical filter code track, the three code tracks are arranged to move horizontally along a length direction, the two grading reading heads and the gradual change sheet reading head maintain fixed and respectively detect the first grating code track, the second grating code track and the linear gradual change optical filter code track by use of laser with a wavelength of lambda, the grating reading heads obtain shift-interference phase information of the grating ruler, and the gradual change sheet reading head obtain shift-reflection light intensity information of a gradual change sheet. According to the invention, while the measurement precision and the measuring range are guaranteed, the system complexity and the cost of an absolute grating ruler are also substantially reduced.

The invention relates to a method for subdividing dual-frequency laser interferometers on the basis of a main phase discriminator and an auxiliary phase discriminator, which comprises the following steps: firstly, pretreating two paths, namely a reference path and a measurement path, of photoelectric signals of the laser interferometer, inputting the photoelectric signals into a reversible counter for signal acquisition, performing eight frequency division on the pretreated signals, inputting the signals into the main phase discriminator for data acquisition, performing phase shift on models of the reference path, and inputting the models of the reference path with Fm_8 into the auxiliary phase discriminator for data acquisition; secondly, resetting the reversible counter, and making an initial phase angle of the main phase discriminator operated within an interval of 0.5+ / -0.125 and a phase angle of the auxiliary phase discriminator operated within an interval of 0.62+ / -0.125; thirdly, making a CPU enter a sampling interruption program when a timing signal arrives to latch data; fourthly, performing error judgment on the data acquired in the third step; and fifthly, performing error elimination and synthesis on the data. The dual-frequency laser interferometers have the characteristics of quick measuring speed, high resolution and multi-frequency phase locking frequency tracing bandwidth during actual measurement.

The invention discloses a preheating control method and device for a plug-in fuel cell vehicle. The method comprises the steps that the travel time and a preheating demand are set through an APP; whether the automobile needs to be charged is detected; after the charging is completed or when the charging is not needed, the TBOX calculates the advanced preheating time; the TBOX awakening time is set, and the vehicle enters a sleep state after setting is completed; after the time is up, the TBOX is awakened, the VCU is awakened after the TBOX is awakened, the BMS\ FCU\ MCU\ DCDC&OBC is awakened by the VCU, and state monitoring is carried out; the OBC is started after completion of determination, electric quantity is provided for work of the PTC, and a power battery and a fuel cell system arepreheated; after preheating is completed, the vehicle enters a sleep state, and the vehicle is started by a user. The defect that an existing fuel cell vehicle cannot be started at a low temperature or waits for a long time to be started is overcome.

The invention relates to a miniaturized capacitive vacuum pressure sensor encapsulation structure and belongs to the capacitive vacuum sensor field. The invention aims to solve a problem caused by the narrowness of a gap between electrode plates, the problem of low anti-overload capacity caused by the largeness of the diameter of electrodes and the contamination of vacuum degree in a vacuum sealed chamber which is caused by a condition that an existing capacitive vacuum pressure sensor is required to be transferred to other equipment to be heated due to the utilization of a gas-state getter in the existing capacitive vacuum pressure sensor. According to the miniaturized capacitive vacuum pressure sensor encapsulation structure of the invention, the lower end surface of a metal movable electrode is fixedly connected with the upper end surface of a lower cover; the upper end surface of the metal movable electrode is fixedly connected with the lower end of a housing; the upper cover is fixedly mounted on the upper end of the housing; a change-over terminal is mounted on the upper cover; the outer edge of the change-over terminal is fixedly connected with the upper cover; a fixed electrode is arranged in the housing; the lower end of conductive rubber contacts with the upper end surface of the fixed electrode; one end of a pin is installed in a groove at the upper part of the conductive rubber, and the other end of the pin is fixedly connected with the change-over terminal; and a sealing joint is welded to the upper cover. The miniaturized capacitive vacuum pressure sensor encapsulation structure of the present invention is used for the measurement of vacuum pressure.

The invention discloses an intelligent fire-fighting device for garden construction. The intelligent fire-fighting device comprises a detection device, a fire extinguishing device, a control device, aWIFI module, an alarming device and an external power supply; the detection device comprises a temperature detection module and a smoke detection module; the fire extinguishing device comprises a fire extinguishing element and a switch element; the control device comprises a signal receiving element for receiving a signal transmitted by the detection device, a signal sending element for sending the signal to the fire extinguishing device, a rotating element for adjusting the direction of the fire extinguishing element, a vertical rotating motor for driving the rotating element to rotate in the vertical direction, and a horizontal rotating motor for driving the rotating element to rotate in the horizontal direction; the rotating element is movably connected with the fire extinguishing element, and the fire extinguishing element can rotate by 360 degrees on the rotating element; and the WIFI module comprises a WIFI element and an intelligent terminal, the WIFI element is electrically connected with the detection device and the alarming device, and the WIFI element can send data detected by the detection device to the intelligent terminal in real time.

The invention provides a fully-mechanized excavating machine comprising: a body which is provided with a cutting unit; a spray device including a nozzle which is disposed in the cutting unit, the nozzle is connected to a first end of an atomizing pump, and a second end of the atomizing pump is connected to a water inlet pipe. The fully-mechanized excavating machine of the present invention can reduce the generation of dust.

The invention belongs to the technical field of communication, and relates to a large-scale MIMO antenna comprising a reflection plate, a calibration network arranged on one side of the reflection plate and N*M antenna subarrays arranged on the side of the reflection plate away from the calibration network, wherein N is a positive integer greater than or equal to 1 and M is a positive integer greater than or equal to 2. The antenna subarrays comprises a power dividing plate and a radiation unit arranged on the power dividing plate. The power dividing plate has a microstrip line structure. Thecalibration network has a microstrip line structure or a strip-line structure. The thickness of the reflection plate is 1.5mm-3mm. The antenna subarrays are connected with the calibration network through a probe. The antenna subarrays and the calibration network are respectively connected with the reflection plate through metal screws, and at least one metal screw is arranged around the probe. Theantenna subarrays, the calibration network and the reflection plate are modularized so that detection, maintenance or replacement of a single module can be facilitated; besides, at least one metal screw is directly grounded around the feeding probe so that the antenna signal transmission is good.

The invention relates to the field of voice signal processing, and provides a concatenation point smoothing method in waveform concatenation. The concatenation point smoothing method in the waveform concatenation is applied to an electronic device. The concatenation point smoothing method in waveform concatenation comprises the steps that concatenation points of two voice units to be subjected toconcatenation are determined, and voice signal segments with preset lengths at the two concatenation points are intercepted correspondingly; the two voice signal segments are correspondingly subjectedto windowing processing through a window function to correspondingly obtain corresponding short-time analysis signals; the amplitudes, phases and frequency of the two short-time analysis signals areacquired correspondingly based on the short-time Fourier transform; polynomial interpolation based on distance weight is carried out on the amplitudes, phases and frequencys of the two short-time analysis signals to acquire new amplitudes, phases and frequency; and sine wave synthesis is carried out on the new amplitudes, phases and frequency to acquire new voice signal segments. According to theconcatenation point smoothing method in waveform concatenation, data of the voice units are analyzed through a sinusoidal model, and the voice signals at the concatenation position are expressed as the sum of a series of sine waves, so that the smooth transition of synthesized voice is ensured, and the improvement of the naturalness degree of the synthesized voice is facilitated.

The invention discloses a static-error-free automatic feedback high-precision fault inversion method, and the method comprises the steps: setting a preset short-circuit, grounding and anti-misoperation fault scene, applying high-fidelity voltage and current signals to a primary side through the control of software and hardware, verifying the fault research and judgment and processing functions andperformances of an intelligent switch, verifying the fault processing capability of a single device, in the hardware level, enabling the fault inversion test system to transmit the load side impedance to the source side through an impedance transmission mode, the control current adopts a current feedback mode, and through a fast-response static-error-free automatic feedback control circuit, driving a large-current MOS tube to generate nonlinear voltage to drive a load loop to obtain a high-precision primary signal, and then obtaining a high-precision measurement result in a two-path multi-channel high-precision synchronous sampling measurement mode; in the software level, for the steady-state signal, recovering the output signal once in real time, and enabling the voltage and current power source to perform compensation correction according to the load difference of the switch to be tested; for a transient signal, enabling the voltage and current power source to periodically perform amplitude and phase calibration setting according to the current output range in a segmented manner.

The invention discloses a full-digital broadband microwave emitter and a control method thereof. A broadband frequency band divider of the emitter divides input signals; n output frequency bands are connected with n independent level regulators respectively; each level regulator is connected to a combiner and then is connected with an emission output end through a power amplifier and the like; and an automatic gain controller and the output end of the power amplifier are connected to a spectral level detector connected with a central monitoring device; and a control end of the central monitoring device is connected with each level regulator, the power amplifier and the automatic gain controller respectively. The control method comprises that: according to level signals of the level detector and the slope of the level gain polygonal line of each frequency band, the central monitoring device regulates gain proportions among the level regulators in real time and suppresses noise intensity while improving the signal level of each frequency band so as to realize the real-time pre-correction control on the emitter. The level gain of each frequency band can be regulated respectively, a working bandwidth is 200 MHz, the noise is effectively reduced, the working efficiency of the amplifier is improved, the full-digital control is adopted, and the implementation is easy.

The invention discloses an electric monorail crane locomotive which comprises a battery cabinet used for installing a storage battery pack, a frequency conversion cabinet used for installing a motor frequency conversion control device, two cabinet body hanging devices hinged to each other and a plurality of driving devices hinged in sequence. Each cabinet body hanging device comprises a cabinet body hanging support used for hanging a cabinet body and a plurality of hanging mechanisms which are hung on an I-shaped rail of the monorail crane and can walk on the I-shaped rail, and the hanging mechanisms are connected to the cabinet body hanging support in a horizontal rotating mode. The battery cabinet and the frequency conversion cabinet are detachably hung on cabinet body hanging supports of the two cabinet body hanging devices respectively, the driving device is driven by a motor, and one hanging mechanism is hinged to the driving device adjacent to the hanging mechanism. The electricmonorail crane locomotive provided by the invention is powered by the storage battery to realize electric driving, the green operation of zero emission, no pollution, low noise and the like of the monorail crane locomotive are realized, and the underground working environment of a coal mine is improved.

The invention provides a novel corrugated gas collecting pipeline member, wherein a section of copper pipe is machined into a corrugated pipe, and the copper pipe can be freely bent back and forth during air-conditioner assembly and complete set installation, and therefore the problems of corrugation and dead turn during installation are solved. Meanwhile, a drawing station, a sealing cap, bending, the corrugated pipe, welding and the like are combined together through accurate calculation, smart design and exquisite technologies, therefore the practicability of the product is increased; in addition, no new equipment is increased under the conventional production conditions, therefore product diversification and high return with small investment are realized.

The invention relates to a cooling control method and system, and an electric vehicle, and aims to solve a problem of relatively high energy consumption caused by unreasonable control of an electronicfan and a cooling water pump. The method comprises the following steps: acquiring characteristic parameter information acquired by a data acquisition module for a vehicle load corresponding to the data acquisition module; determining a cooling level of the corresponding vehicle load according to the characteristic parameter information; obtaining a flow interval corresponding to the cooling waterpump and a rotating speed interval corresponding to the electronic fan according to the cooling level of the vehicle load; and adjusting the flow of the cooling water pump to the flow interval, and adjusting the rotating speed of the electronic fan to the rotating speed interval. The cooling level of the vehicle load can be determined, then whether the cooling water pump or the electronic fan isstarted or not is determined, the flow of the cooling water pump and the rotating speed of the electronic fan are adjusted, an endurance mileage of the electric vehicle is guaranteed, and vehicle energy management is optimized.

The invention discloses a super-power-density diesel engine with sequential intervention type composite combustion systems. The super-power-density diesel engine with the sequential intervention typecomposite combustion systems comprises a common rail pipe, a high-pressure oil pipe, a cylinder cover, a main combustion chamber oil nozzle, an exhaust pipe, an air inlet pipe, an intercooler, a high-pressure-stage turbine bypass valve, a high-pressure-stage turbine, a high-pressure-stage gas compressor bypass valve, a high-pressure-stage gas compressor, a low-pressure-stage turbine, a low-pressure-stage gas compressor, a cylinder body, a low-pressure oil supply pump, an oil tank, a piston, a main combustion chamber, a hydraulic valve, a filter, an auxiliary combustion chamber, an auxiliary combustion chamber oil nozzle, a high-pressure oil pipe, a high-pressure oil supply pump and a rail pressure valve, and is characterized in that the main combustion chamber (18) communicates with the auxiliary combustion chamber (21) through the hydraulic valve (19), the main combustion chamber (18), the high-pressure-stage turbine (9) and a high-pressure common rail system work cooperatively, an ECU issues an instruction to open the hydraulic valve (19), the auxiliary combustion chamber (21) and a secondary supercharging system intervene, the main combustion chamber (18), the auxiliary combustion chamber (21), the high-pressure-stage turbine (9), the low-pressure-stage turbine (12) and the high-pressure common rail system cooperatively work, and a sensor is arranged on the hydraulic valve (19) and is regulated and controlled through the ECU.

The invention relates to the technical field of heating of buses, in particular to electric heat-storage heating equipment of an electric bus. The electric heat-storage heating equipment comprises an air return box, a heat storage box, an air supply box and an electricity supply mechanism. In the electric heat-storage heating equipment, cold air in the bus is led into the air return box through an air return opening in the bus and then input into the heat storage box to be heated; the heated hot air is led into the air supply box through the heat storage box, and the air supply box leads the hot air into the bus through an air supply opening in the bus for heating; and meanwhile, the electricity supply mechanism supplies electricity, so that the electricity quantity of a vehicle-mounted accumulator in the bus is not occupied, and the endurance mileage of the bus is also guaranteed while heating is guaranteed.

The present invention provides a battery pack heat exchange system and an electric vehicle, pertaining to the technical field of new energy sources. The battery pack heat exchange system comprises multiple heat exchange devices, a total water inlet pipe and a total water outlet pipe. The multiple heat exchange devices are arranged corresponding to multiple batteries in a battery pack one by one, and each heat exchange device comprises a water inlet and a water outlet. The multiple water inlets are all connected with the total water inlet pipe, and the multiple water outlets are all connected with the total water outlet pipe, so that the multiple heat exchange devices are connected in parallel. Each heat exchange device is arranged under each single battery, the multiple heat exchange devices are connected in parallel, and when the heat exchange is needed, each heat exchange device performs heat exchange independently, so that the mutual contamination between the heat exchange devices is reduced, and the heat exchange of the battery pack is more even. The electric vehicle comprises the battery pack heat exchange system. The battery pack heat exchange system and the electric vehiclecan solve the technical problem of uneven temperature control among single batteries in the battery pack.

The invention discloses a method for guaranteeing the measuring range of a laser range measurer and improving the measuring precision. The method comprises the following steps of mounting two laser devices on the laser range measurer, wherein the two laser devices use the same signal source and respectively generate laser beams which have different wavelengths and same signals; enabling one laser device to implement alignment and the other laser device to implement measurement, wherein the emission power of the alignment laser device is smaller than that of the measurement laser device, and the spot ratio of the alignment laser device is larger than that of the measurement laser device; during alignment, only starting the alignment laser device; after the alignment is finished, controlling the measurement laser device to implement emission, and shutting down the alignment laser device, and sampling an alignment laser signal which is not subjected to external transmission through a synchronous control receiver; enabling the alignment laser device and the measurement laser device to work and take a rest alternately. According to the method for guaranteeing the measuring range of the laser range measurer and improving the measuring precision, the temperatures of the laser devices always have no large change, so that the aims of guaranteeing the maximum measuring range and keeping the measuring precision are fulfilled; meanwhile, a measurement laser signal is calibrated through the alignment laser signal, and the measuring precision is improved.

A wireless link apparatus includes a plurality of antennas; a signal detector configured to calculate SNR based on a signal received from at least one of the plurality of antennas; and a mode selector configured to determine the number of an antenna to be used in modulation method and signal transmission by comparing the calculated SNR with a preset critical value. Further, the wireless link apparatus includes a transmitter configured to modulate a signal in the modulation method determined by the mode selector and transmit the modulated signal using an antenna corresponding to the determined number of the antennas.