35results about How to "Guaranteed ranging accuracy" patented technology

The invention belongs to the technical field of intelligent transportation and relates to a front vehicle ranging method based on monocular vision. The method includes: adjusting the posture of a vehicular camera, considering the pitch angle variation range due to bumping to adjust the pitch angle of the camera, and using the obtained actual measurement data to segmentally fit the functional relation between an ordinate and an actual longitudinal distance at different pitch angles and the functional relation between the ordinate and an actual transverse distance represented by per horizontal pixel at different pitch angles; and when a vehicle runs, calibrating real-time pitch angle of the camera according to left and right lane lines detected in real time and a three-line calibration method, and then using the linear interpolation method to calculate to obtain the distance between the vehicle and a target vehicle. The front vehicle ranging method based on monocular vision has a real-time dynamic compensation effect on ranging error caused by vehicle bumping and can be used for accurately calculating the distance between the vehicle and the front vehicle.

The invention discloses a measuring method of vehicle distance at curves, belonging to the technical field of driving safety of vehicles at curves. The method is characterized in that the method comprises: (1) collecting road images in front of a vehicle, (2) extracting and fitting lane marking lines of the lane where the vehicle are; (3) positioning a target vehicle; (4) measuring distance of the target vehicle with laser; (5) correcting pitch angle of cameras; (6) performing inverse perspective transformation for road images; and (7) calculating a vehicle distance between the vehicle and the target vehicle on the curves. The method uses a multi-sensor data fusion technology of monocular vision and laser rangefinding, with the monocular vision being main and the laser rangefinding being auxiliary; accurate results of the laser rangefinding is used to correct the pitch angle of the cameras in real time; and the correction values are used to calculate the vehicle distance at the curves, thereby ensuring a precision of the rangefinding and providing reliable data support for security early-warning at the curves.

The invention discloses a distributed power line fault positioning system and method based on wave velocity dynamic measurement of traveling waves. A hand-in-hand distributed system architecture is adopted, in the case that the system has no central master station, when a certain measurement point cannot work normally, the system can still position a fault normally due to the multi-end redundant design, so that the reliability of the system is improved. The independently operating ranging devices can know the operation states and measurement results of other related devices, the measurement result of the present device can be verified, the positioning accuracy of the present device is improved, and the fault / abnormal node can be quickly discovered through mutual verification. Moreover, dueto the application of the hand-held distributed system architecture, bad data having great influence on the accuracy can be filtered and eliminated, and then the measurement precision and accuracy ofthe system are further improved. The actual wave velocity of traveling waves generated by the present fault is measured in real time by using the same type of power wires or power cables in an adjacent area of the fault point, thereby further improving the accuracy of positioning and ranging.

The invention provides a monocular vision sensor with a triangulation ranging function. The monocular vision sensor with the triangulation ranging function mainly comprises a shell, a socket, a circuit board, an imaging device, a laser device, a focus lens set, an illuminating light source, an imaging lens set, a measurement window and the like. A laser beam emitted by the laser device forms a collimated laser beam after passing through the focus lens set, and laser light spots are formed on the surface of a measured target. The imaging lens set images the measured target on the surface of the imaging device together with the laser light spots. Both the two-dimensional information and the distance information of the measured target can be obtained at the same time through calculation, and thus the three-dimensional information of the measured target is obtained by means of the monocular vision sensor. Compared with a conventional vision sensor, the monocular vision sensor with the triangulation ranging function has the advantages that a two-dimensional image of the measured target is obtained, meanwhile the value of the distance between the vision sensor and the measured target can be accurately obtained, and thus a three-dimensional vision sensor can be formed; in addition, the degree of integration is high, the size is small, cost is low, and measurement of a two-dimensional inclination angle can also be achieved.

The invention provides a distance measuring data processing method under an incoherent measuring system. By the method, cycle skipping in distance measuring of the incoherent measuring and control system, and distance measuring precision of the system is guaranteed. According to the technical scheme, the method includes: in an FPGA (field programmable gate array) circuit of a responder, using digital circuits to perform capture tracking, carrier synchronization tracking, data demodulation, bit synchronization and frame synchronization to uplink pseudo codes; extracting frame count value from uplink demodulated data; using a pseudo code clock counting method to convert chip counting into bit counting, code cycle counting and code counting through simple mathematic conversion, using a double code clock sampling method with a phase difference of 180 degrees to perform sampling and time difference comparison to code counting and code phase sampling, distinguishing distance skipping value for algorithm correction, eliminating distance cycle skipping corresponding to code counting, filling pseudo distance information of the acquired uplink pseudo codes into downlink measuring frames in real time, and sending back to a ground measuring and control station to cooperatively complete incoherent distance measuring.

The invention discloses a building engineering quality flatness detection device which comprises a platform frame and a guide rail frame. Universal self-locking wheels are arranged at the bottom of the platform frame. A through slot is arranged on the surface of the platform frame. A control device is arranged on one side of the guide rail frame. The control device is rotatably connected with oneend of the guide rail frame by arranging a damping rotation shaft. A stepping motor and a rotary encoder are arranged on the other end of the guide rail frame. According to the building engineering quality flatness detection device provided by the invention, the output end of a servo motor is driven by a first gear and a second gear to drive a laser distance measuring device on a rotating rod to rotate; an angle encoder controls the rotation angle of the rotating rod, so as to ensure that the laser distance measuring device is perpendicular to an engineering surface to ensure the accuracy of distance measuring; under the driving of a movable frame, flatness detection is realized; two gears are designed to effectively offset the inertia reversal force caused by the stop of rotation of the servo motor; and angle errors are avoided.

The invention relates to the field of wireless communication, and discloses a distributed asynchronous positioning system and method based on an ultra-wide band. According to the invention, the system comprises at least one beacon and at least one tag. The beacons are independent mutually, and the arrangement positions of the beacons are fixed. Moreover, the coordinates of the positions are known for all tags. When the positions of the tags need to be obtained, the tags transmit range-finding requests, and employ a three-direction range-finding algorithm to obtain the distances from the tags to the beacons after the beacon responses are obtained in a signal coverage. When the tags obtain the distance from the tags to at least one beacon, the tags calculate and obtain the positions of the tags. According to the embodiment of the invention, the system achieves the positioning modes of a user side, a network side and a third side at the same time, and system devices do not need to coordinate with each other in advance and are completely independent mutually. Moreover, the arrangement of the equipment devices is not limited.

The invention relates to a sequence component relation based range finding method for a single-end fault of a power transmission line. A replay protector is used to determine a fault type, the sequence component relation in positive, negative and zero-sequence network is determined according to the fault type, sequence electrical quantities at the measuring end are used to calculate sequence electric quantities at the fault point, and the sequence electric quantities of the fault point are substituted into the sequence component relation to solve a fault distance. The method can be used to overcome the problems that data is asynchronous and false root exists, and maintains high range finding precision.

The invention discloses a single photon avalanche diode detector array used for laser range finding. The array comprises a single point detection surface, shaping circuits, an ''And'' processing circuit and an ''Or'' processing circuit. The single point detection surface is integrated by a plurality of detection single tubes in an n*n (n is greater than or equal to 2) mode. Each detection single tube includes a single photon avalanche diode and a quenching circuit. An output signal of each detection single tube is shaped to a pulse square wave signal by the respective shaping circuit. Each twopulse square wave signals form one group and are input into the ''And'' processing circuit. All the signals which are processed by the ''And'' processing circuit are processed by the ''Or'' processing circuit so as to generate a final output signal. By using the detector array, false triggering caused by dark counting and a stray light noise can be effectively reduced; detection efficiency is guaranteed and simultaneously range finding accuracy is ensured; and laser range finding with a high sensitivity can be realized.

The invention discloses a train accurate parking system based on a UWB wireless ranging technology. The train accurate parking system based on the UWB wireless ranging technology comprises a UWB wireless ranging device, an on-board host computer, a train parking point distance calculating module and a train real-time position calculation module, wherein the UWB wireless ranging device comprises UWB main equipment and UWB slave equipment, wherein the UWB main equipment is mounted on a train; the UWB slave equipment is mounted on station trackside equipment; the UWB main equipment is used for measuring a distance between the UWB main equipment and the UWB slave equipment in real time; the on-board host computer is mounted on the train and is used for inputting real-time train speed information from a train control system; the updating frequency and phase of the train speed information are consistent with ranging period of the UWB wireless ranging device; the train parking point distancecalculating module is used for calculating a distance D1 between the UWB main equipment and a train parking point according to a formula of D02=(D1+L0)2+L12; and within a ranging period, the real-timeposition of the train within the ranging period is obtained by performing fitting calculation on the train speed information input within the ranging period. According to the train accurate parking system based on the UWB wireless ranging technology, by using the UWB wireless ranging technology, the distance between the running train during pulling in and a parking point location is accurately measured according to real-time speed of the train during running so that accurate parking of the train during pulling in is realized.

The invention relates to the technical field of radio range finding and particularly to a group range finding method based on a wireless dynamic self-organizing network, wherein the method simultaneously measures distances from one member to multiple other members in the wireless self-organizing network by radio waves. The method ensures range finding precision by roundtrip range finding, and also optimizes a response process. After a member sends a message, other members in the network respond simultaneously after receiving the message. Meanwhile, reception channels of a receiver are increased to ensure the member who initiates the range finding can simultaneously receive range finding messages from other network members. Compared with the prior art, the method has the following beneficial effects that multiple feedbacks can be received at one time such that distances from one member end machine to multiple member end machines can be measured simultaneously, and thus the method is better than a roundtrip time calibration range finding method based on time division. The method may respond immediately, and is obviously better than a range finding method based on network clock synchronization, and the method can perform range finding immediately.

The invention discloses a ranging system with high precision on-line measurement. The ranging system comprises a laser generating unit (1), a transceiving optical antenna unit (2), a ranging signal receiving and processing unit (3), a frequency stabilizing unit (4), a main control unit (5), a secondary power supply unit (6) and an upper computer unit (7). A dual-optical comb femtosecond laser andan optical fiber laser are used as light sources for laser precise measurementand laser rough measurementranging of the system respectively, and non-contact high-precision on-line measurement is realized on the basis of a dual-optical comb femtosecond non-linear down-sampling principle. The system has the advantages of high precision, high frequency response, low power consumption, small size andthe like, is very suitable for measuring equipment such as large satellite antenna unfolding mechanisms and key components of a large airplane, and realizes on-orbit unfolding and on-orbit splicing ofa large-size antenna observation satellite.

The present invention provides a method for fast calibrating the transmitting frequency of a radar. The method comprises the following steps that: S1, the wave band of the radar is modulated so as tobe a frequency band in which the frequencies of the radar under the wave band are in linear relationships with VCO control voltages corresponding to the frequencies of the radar; S2, a center frequency in the frequency band in which the frequencies are in linear relationships with the VCO control voltages is selected as a calibration frequency, a VCO voltage value corresponding to the calibrationfrequency is adopted as a calibration voltage; and S3, a VCO voltage value corresponding to an initial frequency in the frequency band in which the frequencies are in linear relationships with the VCOcontrol voltages, a VCO voltage value corresponding to the calibration frequency, and a VCO voltage value corresponding to a cut-off frequency in the frequency band in which the frequencies are in linear relationships with the VCO control voltages are measured, so that linear relationships between the frequencies and the VCO voltage values are obtained. The VCO voltage value corresponding to thecalibration frequency is given; feedback is performed through a frequency sampling circuit, so that a feedback-post calibration frequency is obtained; and when the feedback-post calibration frequencyis inconsistent with the calibration frequency, the calibration voltage is adjusted, so that the calibration frequency measured by the frequency sampling circuit is made to be consistent with the calibration frequency.

The invention discloses an AGV positioning navigation system and method based on RFID and ultrasonic waves. The system is characterized by comprising n vehicle-mounted terminals and a monitoring service center, the n vehicle-mounted terminals are used for finishing a plurality of distribution tasks in the indoor work environment, and any vehicle-mounted terminal comprises a vehicle-mounted Wi-Fi communication module, an RFID and ultrasonic positioning module and a control module. The monitoring service center comprises a Wi-Fi communication module, a route management module, a GIS search engine and a database. A layout graph of the indoor work environment is saved in the database. The synchronization problem caused when emitting and receiving of ultrasonic waves are not on the same side is solved on the system level by means of the positioning technology combining RFID and ultrasonic waves. Positioning precision of an AGV is improved by means of the positioning algorithm of a least squares support vector machine.

The invention discloses a bumper of an electric bicycle. The bumper comprises a drive motor, a belt, a brake connecting rod and a bumper box. The drive motor is mounted on a front fork of the electric bicycle and is connected with the brake connecting rod through the belt. The brake connecting rod is connected with a front-wheel brake device of the electric bicycle. The bumper box comprises two range radars, a signal generator module, a signal relay, a delay control module, a control relay, a buzzer alarm, a power source and the like. When a distance measured by probes of the range radars reaches a set value, the signal generator module generates an electric signal through the probes of the range radars, the electric signal is changed into a current capable of driving the signal relay to move by an amplifying and rectifying circuit to enable the signal relay to move, the delay control module and the control relay are triggered to drive the drive motor to be electrified, the belt of the drive motor drives the brake connecting rod to move, buzzer alarming and braking are completed, the electric bicycle is powered off, and thus, safety performance is improved.

The invention belongs to the technical field of optical measurement, and particularly relates to a target distance obtaining method. According to the technical scheme, based on a multi-target distanceobtaining method of an existing distance measuring system, pulse laser is emitted through an emitting optical member and is collected to a detector by a receiving optical member after being reflectedby a target, an electric signal output by the detector is processed by a signal processing board, and a high-speed collecting circuit is used for collecting a detector signal; andfinally, through peak detection, finding a local strongest point of echo signal energy as a feature point of the target, wherein the position corresponding to the point represents the distance information of the target.According to the technical scheme, a high-speed continuous sampling circuit is used for continuously collecting reflection signals, and the multi-target distance is obtained by searching for a plurality of peak points of a voltage sequence obtained through sampling; and the target distance is obtained according to the sequence of the target and other objects on the irradiation path. The problem that the prior art is inconvenient to use is solved.

The invention belongs to the technical field of intelligent transportation and relates to a front vehicle ranging method based on monocular vision. The method includes: adjusting the posture of a vehicular camera, considering the pitch angle variation range due to bumping to adjust the pitch angle of the camera, and using the obtained actual measurement data to segmentally fit the functional relation between an ordinate and an actual longitudinal distance at different pitch angles and the functional relation between the ordinate and an actual transverse distance represented by per horizontal pixel at different pitch angles; and when a vehicle runs, calibrating real-time pitch angle of the camera according to left and right lane lines detected in real time and a three-line calibration method, and then using the linear interpolation method to calculate to obtain the distance between the vehicle and a target vehicle. The front vehicle ranging method based on monocular vision has a real-time dynamic compensation effect on ranging error caused by vehicle bumping and can be used for accurately calculating the distance between the vehicle and the front vehicle.

The invention discloses a follow-up walking accurate distance measurement positioning device for a four-way shuttle vehicle, which comprises a follow-up distance measurement wheel swing arm (3) movably arranged on a four-way shuttle vehicle body (1), one end of the follow-up distance measurement wheel swing arm (3) is movably fixed through a swing arm rotating shaft (4) fixedly arranged on the four-way shuttle vehicle body (1), and the other end of the follow-up distance measurement wheel swing arm (3) is movably fixed through a swing arm rotating shaft (5) fixedly arranged on the four-way shuttle vehicle body (1). One end of the follow-up distance measuring wheel swing arm (3) is provided with a swing arm rotating shaft (4), the follow-up distance measuring wheel swing arm (3) can freely rotate around the swing arm rotating shaft (4), the other end of the follow-up distance measuring wheel swing arm (3) is fixedly provided with a rotating shaft sleeve (18), and the follow-up distance measuring wheel (5) is fixedly arranged at one end of the follow-up distance measuring wheel rotating shaft (6) and is movably arranged in the rotating shaft sleeve (18) through the follow-up distance measuring wheel rotating shaft (6). The problem that positioning is inaccurate due to inaccurate distance measurement caused by deformation, abrasion, slipping and the like of walking wheels in the long-distance running process of the four-way shuttle vehicle is solved.

The invention discloses a camera calibration method suitable for track and field distance measurement, and belongs to the field of training and match referees of sports track and field projects. By adopting the method, no calibration object needs to be arranged on site, and equipment and a measurement method for track and field distance measurement are used for calibration. For the distance measurement of a shot, a shot throwing method is used, a trace is formed at a landing point, and then a tape measure is used for measuring the throwing distance (the height needs to be measured at the same time). The operation is carried out for several times, physical coordinates of a landing point are measured and obtained, coordinates of a shot in a picture when the shot lands are obtained at the same time, and after a plurality of groups of data are obtained, calibration work of the camera can be completed by using a corresponding method. The whole method is simple and convenient and can be completed by a common user, and the use of a specific calibration object and a specific measurement method is avoided. And an object and a measurement method used for calibration are unified with an object and a measurement method used in actual use, so that the distance measurement precision in final use is greatly ensured.

The invention discloses a temperature control system for controlling optical fiber temperature excursion and a control method of the temperature control system. An aluminum alloy cylinder is placed in the middle of a glass fiber reinforced plastic cubic box, and a gap between the aluminum alloy cylinder and the glass fiber reinforced plastic cube is filled by aerogel. Deionized water is fully filled inside the aluminum alloy cylinder, an optical fiber winder is submerged by the deionized water, and a sealing ring is added between the aluminum alloy cylinder and a cylinder cover for sealing. The outer surface of the whole cylinder is plated with silver coatings. A plurality of layers of heat insulation materials covers the outer wall of the glass fiber reinforced plastic cubic box of the whole device. The low heat conducting performance of the multilayer, the aerogel and the glass fiber reinforced plastics is utilized, and the influence on the inside optical fiber caused by external heat sources is prevented. Through the deionized water with great specific heat capacity and aluminum alloy liquid with good heat conducting performance adopted at the inside, the heating quantity generated by the optical fiber per se is diffused as soon as possible, and in addition, the caused temperature is diffused as little as possible. The temperature control system has the advantages that the temperature excursion of the optical fiber is effectively controlled, and distance measuring signals transmitted to the tail end of the optical fiber are enabled not to generate the distortion phenomenon.

The invention discloses an AGV positioning navigation system and method based on RFID and ultrasonic waves. The system is characterized by comprising n vehicle-mounted terminals and a monitoring service center, the n vehicle-mounted terminals are used for finishing a plurality of distribution tasks in the indoor work environment, and any vehicle-mounted terminal comprises a vehicle-mounted Wi-Fi communication module, an RFID and ultrasonic positioning module and a control module. The monitoring service center comprises a Wi-Fi communication module, a route management module, a GIS search engine and a database. A layout graph of the indoor work environment is saved in the database. The synchronization problem caused when emitting and receiving of ultrasonic waves are not on the same side is solved on the system level by means of the positioning technology combining RFID and ultrasonic waves. Positioning precision of an AGV is improved by means of the positioning algorithm of a least squares support vector machine.

The invention discloses a ranging system for high-precision on-line measurement, comprising: a laser generating unit (1), a transceiver optical antenna unit (2), a ranging signal receiving and processing unit (3), a frequency stabilizing unit (4), a main Control unit (5), secondary power supply unit (6) and host computer unit (7). In the present invention, a dual-comb femtosecond laser and a fiber laser are used as the light sources of the system's laser precision measurement and laser rough measurement and ranging, respectively, and based on the femtosecond dual-comb nonlinear down-sampling principle to realize non-contact high-precision online measurement, with With the advantages of high precision, high frequency response, low power consumption, and small size, it is very suitable for measuring large-scale satellite antenna deployment mechanisms and key components of large aircrafts, and realizing on-orbit deployment and on-orbit splicing of large-scale antenna observation satellites.

The invention discloses an emergency rescue personnel location system and an emergency rescue personnel location method. The emergency rescue personnel location system comprises a position presenting subsystem, a data receiving-transmitting subsystem, a temporary location station subsystem and a personal location subsystem, wherein the temporary location station subsystem comprises a plurality of temporary location stations; the personal location subsystem comprises a plurality of personal location modules, the data receiving-transmitting subsystem is respectively connected with the position presenting subsystem and the temporary location stations, and the temporary location stations are connected with the personal location modules. The ranging distance in an open space can reach 1km, and the ranging precision is less than or equal to 3cm under 99% situation. The emergency rescue personnel location system can effectively penetrate through a load-bearing wall with the thickness of 30cm inside a room; even in a large-sized building, the effective transmission of the data also can be guaranteed. Under the outdoor situation, the transmission distance in the open space can reach 2 km, the transmission distance is more than 300m when an obstacle exists, and in order to guarantee sufficient diffraction performance, on the aspect of the wireless data transmission, a Mesh network working at 433Mhz is adopted.

The invention relates to the technical field of a ranging device and provides a compact rangefinder telescope, which comprises a telescope main body. The telescope main body comprises a housing. The housing is provided with an eye lens. The housing is internally provided with a laser ranging module. The laser ranging module comprises an infrared emitter and an infrared receiver. The infrared receiver is connected with a signal processing module. The signal processing module is connected with a display screen for displaying measurement distance. The display screen is arranged in the housing. Light rays emitted by display screen face to the eye lens. A conventional rangefinder telescope is optimized; and the size is reduced and the ranging precision is ensured.

The invention discloses an expressway vehicle distance sensing device, and belongs to the field of vehicle distance sensing devices.The expressway vehicle distance sensing device comprises a shell, a circuit board is fixedly installed in the shell, a battery is fixedly connected to the bottom of an inner cavity of the shell, a charging wire is fixedly connected to one side of the battery, and a charging interface is fixedly connected to one end of the charging wire; the other side of the battery is electrically connected with the bottom of one side of the circuit board through a first wire. According to the expressway vehicle distance sensing device, by arranging the laser receiving and transmitting unit, the key input unit, the MCU operation processing unit, the screen display unit and the loudspeaker unit, a driver can be reminded of the distance between a vehicle and a front vehicle in time when the vehicle runs on an expressway, so that the enough safe distance between the vehicle and the front vehicle is kept, and safer driving experience is obtained; and meanwhile, the user can obtain comfortable experience by setting a reminding distance and a reminding mode (flashing of a loudspeaker or a screen).

The invention provides a distance measuring data processing method under an incoherent measuring system. By the method, cycle skipping in distance measuring of the incoherent measuring and control system, and distance measuring precision of the system is guaranteed. According to the technical scheme, the method includes: in an FPGA (field programmable gate array) circuit of a responder, using digital circuits to perform capture tracking, carrier synchronization tracking, data demodulation, bit synchronization and frame synchronization to uplink pseudo codes; extracting frame count value from uplink demodulated data; using a pseudo code clock counting method to convert chip counting into bit counting, code cycle counting and code counting through simple mathematic conversion, using a double code clock sampling method with a phase difference of 180 degrees to perform sampling and time difference comparison to code counting and code phase sampling, distinguishing distance skipping value for algorithm correction, eliminating distance cycle skipping corresponding to code counting, filling pseudo distance information of the acquired uplink pseudo codes into downlink measuring frames in real time, and sending back to a ground measuring and control station to cooperatively complete incoherent distance measuring.

The invention relates to a sequence component relation based range finding method for a single-end fault of a power transmission line. A replay protector is used to determine a fault type, the sequence component relation in positive, negative and zero-sequence network is determined according to the fault type, sequence electrical quantities at the measuring end are used to calculate sequence electric quantities at the fault point, and the sequence electric quantities of the fault point are substituted into the sequence component relation to solve a fault distance. The method can be used to overcome the problems that data is asynchronous and false root exists, and maintains high range finding precision.

The invention discloses a mining multi-mode wireless distance measuring system based on a UWB technology. The mining multi-mode wireless distance measuring system comprises at least two distance measuring sensors. Each distance measuring sensor comprises an embedded processor, a UWB distance measuring module, an onboard antenna, a parameter setting module, an SD card module, a signal output isolation module, a display screen, a buzzer, an SD card module and a power supply module. Aiming at actual working conditions of an underground coal mine, the method can realize the following steps: 1) point-to-point distance measurement, point-to-multipoint distance measurement and multipoint mutual distance measurement; and 2) multiple sets of wireless ranging systems can independently work in the same working area in groups. The distance between the sensors is calculated by adopting a TOF distance measurement algorithm, and distance information or control signals are transmitted to corresponding equipment controllers, so that position sensing between mining and transportation equipment is realized, the functions of linkage control, autonomous following, collision prevention and the like between the equipment are further realized, and the method has great significance in improving the underground automatic production level of a coal mine. The labor intensity of staff is reduced, the labor is reduced, the efficiency is improved, and safe production is realized.

The invention discloses a temperature control system for controlling optical fiber temperature excursion and a control method of the temperature control system. An aluminum alloy cylinder is placed in the middle of a glass fiber reinforced plastic cubic box, and a gap between the aluminum alloy cylinder and the glass fiber reinforced plastic cube is filled by aerogel. Deionized water is fully filled inside the aluminum alloy cylinder, an optical fiber winder is submerged by the deionized water, and a sealing ring is added between the aluminum alloy cylinder and a cylinder cover for sealing. The outer surface of the whole cylinder is plated with silver coatings. A plurality of layers of heat insulation materials covers the outer wall of the glass fiber reinforced plastic cubic box of the whole device. The low heat conducting performance of the multilayer, the aerogel and the glass fiber reinforced plastics is utilized, and the influence on the inside optical fiber caused by external heat sources is prevented. Through the deionized water with great specific heat capacity and aluminum alloy liquid with good heat conducting performance adopted at the inside, the heating quantity generated by the optical fiber per se is diffused as soon as possible, and in addition, the caused temperature is diffused as little as possible. The temperature control system has the advantages that the temperature excursion of the optical fiber is effectively controlled, and distance measuring signals transmitted to the tail end of the optical fiber are enabled not to generate the distortion phenomenon.

The invention discloses a working state management method and system for a digital car key. The digital car key includes an electronic device with a digital key system, and a low-precision wireless communication system and a high-precision wireless communication system are arranged in the digital key system; the method It includes the first management method for the electronic equipment from the standby state outside the car to entering the vehicle: when the electronic equipment is in a stationary state, the wireless broadcasting of the digital key system is turned off; when the motion state of the electronic equipment reaches a preset condition, then Turn on the wireless broadcast; when the electronic device is close to the car end and the distance from the car end reaches the preset value, turn on the high-precision wireless communication system; when the electronic device enters the car, prolong the connection interval of the digital key system; through the above method, respectively The power consumption of the digital key system is optimized in several stages, such as standby outside the car, connection maintenance, dynamic ranging, and standby in the car, so as to improve its utilization efficiency of power and prolong the standby time.