40results about How to "The ranging result is accurate" patented technology

The invention relates to a two-end distance measuring method of transmission line fault under a dynamic condition, comprising the following steps of: acquiring two-end voltage and current signals through two-end phasor measurement units of the transmission line; then acquiring dynamic positive sequence impedance, admittance, wave impedance and propagation coefficients according to line parameter estimation and a dynamic line parameter method; and finally solving a nonlinear equation related to a fault distance according to the fact that positive sequence voltages derived from two ends to a fault point are equal by applying a Newton iteration method so as to obtain a dynamic distance measuring result of the transmission line fault. The two-end distance measuring method can more effectivelysolve the problem of line parameter and fault distance estimation under the dynamic condition and has accurate and reliable fault distance measuring result.

The invention provides a rotation optical scanning distance measuring device and a method and relates to the field of distance measuring. The rotation optical scanning distance measuring device comprises a fixed base, an angle encoder, a rotation platform, a motor rotor, a motor stator, a laser light source, a light sensing device, a power supply transmission and data receiving device and a data processing device. The motor stator drives the rotation plate to rotate through the motor rotor. The laser light source and the light sensing device are fixed on the rotation platform. The light sensing device is used for reflected laser emitted by the laser light source. The power supply transmission and data receiving device is fixedly connected to the fixed base. A power supply receiving and wireless data transmission device is arranged on the rotation platform and is used for receiving data and electric power emitted by the power supply transmission and data receiving device. The power supply receiving and wireless data transmission device is connected with the light sensing device. The angle encoder is fixed on the rotation platform. The data processing module is connected with the angle encoder and the light sensing device. According to the invention, a technical problem that inner devices in a small laser are easily worn is solved.

The invention provides a distance protection method of high-voltage DC transmission circuit. The method is constituted on the basis of a time domain distribution parameter model and comprises following steps: firstly, calculating the voltage and the current at the tail end of a protection range by the distribution parameter model of a power transmission circuit according to the voltage and the current of a protection arrangement position; secondly, calculating the fault distance by a lumped parameter RL model of the transmission circuit according to the voltage and the current of the tail end of the protection range, and determining whether the fault is in or out of a protection region according to the symbol of the fault distance. The calculation of the protection method is carried out in time domain and requires a short data window and a great amount of calculation based on RL model. The method has the advantages of simple calculation and low sampling rate, thus rapidly monitoring the fault.

The invention provides an ultrasonic range-measuring system which comprises a driving circuit, an ultrasonic probe, a return signal detecting circuit and a singlechip microcomputer, wherein the singlechip microcomputer is connected with the driving circuit, the driving circuit is connected with the ultrasonic probe, a detecting signal of the ultrasonic probe is output to the return signal detecting circuit, an output end of the return signal detecting circuit is connected with the singlechip microcomputer, an analogue switch is further connected between a signal output end of the ultrasonic probe and the return signal detecting circuit, when the singlechip microcomputer sends out a starting signal to the driving circuit, the analogue switch disconnects the connection of the return signal detecting circuit from the range-measuring system, when the singlechip microcomputer stops sending the starting signal to the driving circuit, the analogue switch connects the connection of the returnsignal detecting circuit in the range-measuring system, and the return signal detecting circuit is disconnected when an ultrasonic wave is sent due to the analogue switch with a single-pole double-throw function, so that the self-oscillation caused by the fact that a driving signal is input into a follow-up amplifying circuit can be avoided, and a blind zone detecting distance of the ultrasonic probe can be effectively reduced.

The invention discloses a frequency-modulated continuous wave landing radar ranging method based on gravity center correction. The method includes acquiring echo signals of a frequency-modulated continuous wave landing radar; (2) obtaining a two-dimensional matrix of the echo signals after frequency modulation is obtained; (3) obtaining the frequency spectrum of the differential frequency signal;(4) obtaining the first estimated values of the spectral gravity center and the spectral width of the differential frequency signal; (5) calculating the noise power of the frequency spectrum of the differential frequency signal; (6) obtaining second estimated values of the spectral gravity center and the spectral width of the differential frequency signal; (7) acquiring a ground incident angle ofthe frequency-modulated continuous wave landing radar antenna beam; and (8) obtaining a corrected ranging result. The corrected distance estimation value is obtained by adding a gravity center correction coefficient, the method can be applied to the frequency-modulated continuous wave landing radar ranging, and the requirement for distance measurement with higher precision can be met.

The invention discloses an unmanned aerial vehicle obstacle avoidance method based on a binocular vision system. A binocular vision system acquires image information to obtain depth map information; with an ecological method, denoising is performed on the depth map by combining an exponential weighted moving average algorithm; an obstacle contour is extracted according to a threshold segmentationalgorithm based on region growing and fitting is performed by using a rectangular box to obtain a parallax value; an obstacle distance is calculated by the similar triangle theorem; the obtained distance is transmitted to a flight controller and is compared with a preset threshold distance, different commands are sent out, and then an unmanned aerial vehicle completes obstacle avoidance at accurate timing. According to the invention, on the basis of combination of the morphological method with the exponential weighted moving average algorithm, the denoising degree of the depth map is increased, the calculation accuracy of the distance between the unmanned aerial vehicle and the obstacle is improved, the fast visual obstacle avoidance capability of the unmanned aerial vehicle is enhanced, and the accuracy is greatly improved by being compared with the existing algorithms.

The invention discloses a handheld electronic device with a distance measurement function for measuring a distance between the handheld electronic device and a target object. The handheld electronic device with the distance measurement function comprises a main body, and further comprises a positioning system for setting a position system between the main body and the target object; a target object imaging system for obtaining a virtual image of the target object on the main body; and a data processor for converting and obtaining the distance between the handheld electronic device and the target object according to different display positions of the virtual image in the main body. The invention also discloses a distance measurement method of the handheld electronic device. The device and the method, provided by the invention, get rid of interference of manual factors, and have the advantages of accurate distance measurement result, high repeatability, and simple and convenient application and the like.

The invention provides a networking method for stepping variable-frequency radar communication integration. The networking method includes that different radars are differentiated according to difference of communication signals and stepping variable-frequency signals, difference in stepping variable-frequency signals among the different radars is quite small, the stepping variable-frequency signals is a low-frequency single-frequency signal after frequency mixing, and carrier frequency of the communication signals is relatively high, so that communication information and radar information can be demodulated through different filters; distance among the different radars is measured by utilizing a bidirectional communication time method, distance measuring result is transmitted through the communication information, and a radar communication integration network on the basis of radar relative position is set up finally.

The invention belongs to the technical field of the distance protection for the power grid, and particularly relates to a distance measurement method for a distance protection based on a petal-type power grid. According to the distance measurement method, the method avoids an excessive resistance, has a high ability to withstand the load current, and can accurately acquire the fault distance, thereby completing the fault point positioning quickly. The distance measurement method is convenient to realize; can provide accurate results of the distance measurement for a fault detection and positioning; improves the efficiency of a grid fault detection and elimination; and further improves the stability and safety of the petal-shaped power grid.

The invention discloses a fault location method and a system based on transient travelling waves within a short time window. The method comprises the steps of acquiring the data of travelling waves at the two ends of an electric transmission line before the occurrence of a fault, and subjecting the data to signal power-frequency fitting treatment to obtain an accurately fitted function value; calculating a voltage modulus or a current modulus at a fault point according to the data of traveling waves; according to the accurately fitted function value, conducting the Karen bell transform treatment and the data alignment treatment to obtain accurate and synchronized data values; according to accurate and synchronized data values, conducting the wavelet transform treatment to extract the time difference between modulus maximum values for fault location, and finally obtaining an accurate fault location value. According to the method provided in the invention, the data of traveling waves are subjected to the signal fitting and data alignment treatment, so that the travelling wave-based fault location does not rely on the time information of GPS timing equipment. The limitations of the GPS timing equipment are overcome. Therefore, the method and the system can greatly improve the reliability of transient travelling wave-based fault location, so that fault location results are more accurate.

The present invention provides a laser scanning distance measurement device and method, and relates to the distance measurement field. The device comprises a fixed pedestal, an angle encoder, a rotation platform, a motor, a laser source, a sensitization device, a power supply transmission and data receiving device, a receiving device and a data processing module; the motor drives the rotation of the rotation platform through a driving belt; the laser source and the sensitization device are fixed on the rotation platform; the sensitization device is configured to receive the laser emitted by the laser source; the power supply transmission and data receiving device is fixedly connected on the fixed pedestal; a power supply receiving and wireless data transmission device is connected with the rotation platform; the power supply receiving and data transmission device is configured to receive the data and the electric energy emitted by the power supply transmission and data receiving device; the receiving device and wireless data transmission device is connected with the sensitization device; the angle encoder is fixed on the rotation platform; and the data processing module is connected with the angle encoder and the sensitization device. The technical problem is solved that the internal parts of the small-scale laser radar is easy to wear.

The invention relates to a range finding method and system for a direct current rail transit power supply line short circuit fault. The method comprises the following steps: S1, whether a permanent short-circuit fault occurs on a DC rail transit power supply line is detected; S2, when the permanent short-circuit fault occurs on the DC rail transit power supply line and the pantograph falling of a vehicle does not does not occur, the distance between a sampling point and a short-circuit fault point is obtained through short circuit fault range finding carried out on the sampling point on the direct current rail transit power supply line. The method of the invention can avoid the shortcomings in the prior art which require the vehicle to stop to find the short circuit fault with a lot of manpower and material resources. The method of the invention can quickly find out the short circuit fault point, which is important for the safety of rail transportation and economic operation.

The invention provides a magnetic suspension optical scanning range finding device and method, relating to the field of range finding. The magnetic suspension optical scanning range finding device includes a fixed base, an angle encoder, a rotating system, a laser range finding system, a power supply transmission and data reception device, a power supply reception and wireless data transmission device, and a data processing module, the rotation of the laser range finding system is realized by a magnetic suspension device to prevent machinery wearing, the power supply reception and wireless data transmission device is used to receive data and electrical energy transmitted by the power supply transmission and data reception device, and the power supply reception and wireless data transmission device supplies power to the laser range finding system, so that the wire wearing can be prevented. The invention solves the technical problems that a small-sized laser radar internal device in the prior art is easy to wear and influences the service life.

The invention relates to a UWB multi-dimensional positioning method and system, computer equipment and a storage medium. The key points of the technical scheme are that the method comprises the steps of obtaining basic information of each base station; according to the basic information of each base station, carrying out distance measurement on the label through each base station to obtain each piece of distance information between the label and each base station; according to the basic information of each base station and each piece of distance information, judging the resolving group of the label; calculating according to the resolving group of the label and each piece of distance information to obtain a label coordinate of the label. The method has the advantages of high stability and capability of quickly and accurately providing a distance measurement result.

The embodiment of the invention provides a terminal positioning method and device. The method comprises the steps of: obtaining a distance measurement result of each base station for a terminal, wherein the distance measurement result comprises the actual received signal strength of a wireless frame for distance measurement received by the base station and a distance parameter between the base station and the terminal obtained by distance measurement; acquiring the actual transmitting power of the terminal for transmitting the wireless frame; calculating the accuracy of each ranging result according to the actual received signal strength and distance parameter of each ranging result and the corresponding actual transmitting power; selecting a preset second number of target ranging resultsfrom the plurality of ranging results according to the accuracy of each ranging result; and calculating the position of the terminal by adopting the distance parameter of the target distance measurement result. According to the embodiment of the invention, the distance measurement result with a good sight distance propagation effect can be screened out from the distance measurement results of thebase stations, so that a more accurate positioning result is obtained.

The invention provides a distance measurement model correction method of a binocular camera, a distance measurement method and device and an automatic driving system, which are used for accurate distance measurement of the binocular camera. The distance measurement model correction method comprises the following steps of: defining optical axes of a left camera and right camera of the binocular camera, which are parallel to each other, as a first optical axis and a second optical axis respectively; deviating the first optical axis to obtain a third optical axis, wherein the first optical axis and the third optical axis form an included angle of alpha 1 degrees, deviating from the second optical axis to obtain a fourth optical axis, wherein the second optical axis and the fourth optical axisform an included angle of alpha 2 degrees; and obtaining a first distance measurement model based on the first optical axis and the second optical axis, and deducing a second distance measurement model according to the first distance measurement model, the included angle of alpha 1 degrees and the included angle alpha 2 degrees. According to the invention, the distance measurement precision of the binocular camera is further improved by correcting and compensating the ideal model of the binocular camera.

The invention discloses a correction method, electronic equipment and a computer readable storage medium. The correction method comprises the following steps: acquiring an original depth map, acquiring a depth phase difference of each pixel in the image sensor according to a preset relation and coordinate values of pixel points in the original depth map, and acquiring a correction depth value of each pixel according to the depth phase difference of the pixel and an original depth value of the pixel. The original depth map comprises a plurality of pixel points, each pixel point in the original depth map is in one-to-one correspondence with each pixel of the image sensor, and the original depth value of each pixel point in the original depth map is the original depth value of each corresponding pixel; the preset relationship reflects a depth phase difference between the original depth map and the corrected depth map and a relationship between coordinate values of pixel points in the original depth map, the corrected depth map comprises a plurality of pixel points, and the pixel points in the corrected depth map are in one-to-one correspondence with the pixels of the image sensor; the corrected depth value of each pixel point in the corrected depth map is the theoretical depth value of each corresponding pixel.

The invention relates to the technical field of power system automation and particularly discloses a double-loop fault ranging method based on a distributed parameter model. The method comprises: busvoltages UM and UN at two sides of a fault line and current data II M , III M, II N and III N of a line protection device are collected; current fault components deltaII M, deltaIII M, deltaII N and deltaIII N corresponding to the current data II M, III M, II N and III N of the line protection device as well as respectively corresponding positive sequence, negative sequence and zero sequence components are calculated respectively; voltage fault components deltaUM and deltaUN corresponding to the bus voltages UM and UN at the two sides of the fault line as well as respectively corresponding positive sequence, negative sequence and zero sequence components are calculated respectively; a fault ranging equation general formula needed by a fault distance ratio d / L is solved and a fault distanceratio d / L is calculated; and the fault distance ratio d / L is outputted. In addition, the invention also discloses a double-loop fault ranging apparatus based on a distributed parameter model. With the ranging method, ranging of a fault point is realized under the circumstance that line parameters are unknown.

The invention provides an ultrasonic range-measuring system which comprises a driving circuit, an ultrasonic probe, a return signal detecting circuit and a singlechip microcomputer, wherein the singlechip microcomputer is connected with the driving circuit, the driving circuit is connected with the ultrasonic probe, a detecting signal of the ultrasonic probe is output to the return signal detecting circuit, an output end of the return signal detecting circuit is connected with the singlechip microcomputer, an analogue switch is further connected between a signal output end of the ultrasonic probe and the return signal detecting circuit, when the singlechip microcomputer sends out a starting signal to the driving circuit, the analogue switch disconnects the connection of the return signal detecting circuit from the range-measuring system, when the singlechip microcomputer stops sending the starting signal to the driving circuit, the analogue switch connects the connection of the return signal detecting circuit in the range-measuring system, and the return signal detecting circuit is disconnected when an ultrasonic wave is sent due to the analogue switch with a single-pole double-throw function, so that the self-oscillation caused by the fact that a driving signal is input into a follow-up amplifying circuit can be avoided, and a blind zone detecting distance of the ultrasonic probe can be effectively reduced.

The invention discloses a power distribution network fault distance measurement method and system and an integrated traveling wave distance measurement device. According to the method, fault section determination is carried out to reduce the fault range, then impedance method distance measurement and traveling wave distance measurement are carried out, and all distance measurement results are integrated to obtain an accurate distance measurement result. The device is additionally provided with a distance measurement function on the basis of a conventional power distribution terminal, does notneed an additional independent device, is low in cost and is simple in construction.

The invention provides a monocular camera-based distance measurement method and device, equipment and a storage medium. The method comprises the steps that a road image shot when the mobile terminal device runs on a road is obtained in real time, a first target distance is obtained according to a current frame of the road image, and the first target distance is used for representing the longitudinal distance between a target object to be subjected to distance measurement in the current frame and the mobile terminal device; according to the image data of the target object in the current frame, the image data of the target object in a pre-stored reference frame and a pre-acquired weighted fusion coefficient, performing weighted fusion on the first target distance to obtain a second target distance after weighted fusion, weighted fusion is carried out on the measured first target distance according to the change conditions of the target object in different image frames, and an accurate distance measurement result can also be obtained in a complex road condition.

The invention relates to a two-end distance measuring method of transmission line fault under a dynamic condition, comprising the following steps of: acquiring two-end voltage and current signals through two-end phasor measurement units of the transmission line; then acquiring dynamic positive sequence impedance, admittance, wave impedance and propagation coefficients according to line parameter estimation and a dynamic line parameter method; and finally solving a nonlinear equation related to a fault distance according to the fact that positive sequence voltages derived from two ends to a fault point are equal by applying a Newton iteration method so as to obtain a dynamic distance measuring result of the transmission line fault. The two-end distance measuring method can more effectivelysolve the problem of line parameter and fault distance estimation under the dynamic condition and has accurate and reliable fault distance measuring result.

The invention discloses an automatic driving control method for a low-pass obstacle, and the method comprises the steps: carrying out the two-stage visual recognition of the image content collected in the continuous driving process of an automatic driving vehicle, and obtaining the precise information of a target obstacle; combining a pre-constructed image distance measurement engine, and obtaining accurate distance measurement result of low-pass obstacle and vehicle; and finally, by utilizing the identified target obstacle information and the accurate distance measurement result, realizing an adaptive obstacle avoidance decision taking the obstacle type as the guide. According to the invention, accurate detection of the low-pass obstacle is realized, driving safety measures can be flexibly adjusted in cooperation with the detection result of the low-pass obstacle, and the purpose of reasonably avoiding or passing through the low-pass obstacle in a targeted manner is achieved.

The invention relates to a flight time obtaining method and device and an electronic device. The method comprises the following steps: obtaining the energy of first reflected light received in a firstperiod according to the energy of all reflected light received in the first period and the energy of second reflected light received in the first period; obtaining the energy of the first reflected light received in the second period according to the energy of the whole reflected light received in the second period and the energy of the second reflected light received in the second period; and obtaining the flight time according to the energy of the first reflected light received in the first period, the energy of the first reflected light received in the second period and the length of the first period.

The invention relates to an intelligent filtering type circuit monitoring receiving type USB interface comprising a USB interface body (1), a cuboid-shaped interface box body (2), a spring (3), a range finder sensor (5), a control module (4), a power supply, an electrically controlled telescopic rod (6), and a filter circuit (7). The power supply, the electrically controlled telescopic rod (6), and the filter circuit (7) are connected with the control module (4). According to the technical scheme, the hardware modules are connected to form the provided USB interface, so that the USB interface body (1) and the interface of connected USB equipment can be effectively protected, thereby effectively guaranteeing normal work of the USB interface body (1).

The invention relates to a range finding method and system for a direct current rail transit power supply line short circuit fault. The method comprises the following steps: S1, whether a permanent short-circuit fault occurs on a DC rail transit power supply line is detected; S2, when the permanent short-circuit fault occurs on the DC rail transit power supply line and the pantograph falling of a vehicle does not does not occur, the distance between a sampling point and a short-circuit fault point is obtained through short circuit fault range finding carried out on the sampling point on the direct current rail transit power supply line. The method of the invention can avoid the shortcomings in the prior art which require the vehicle to stop to find the short circuit fault with a lot of manpower and material resources. The method of the invention can quickly find out the short circuit fault point, which is important for the safety of rail transportation and economic operation.

The invention relates to an intelligent filtering detection hinge which comprises fixing sheets (1), a rotary shaft (2), a box (4), a distance measurement sensor (7), a control module (5), an external power source (6), a voice alarm (8) and a filtering circuit (9), wherein the external power source (6), the voice alarm (8) and the filtering circuit (9) are connected with the control module (5). The box (4) is arranged on one face of one fixing sheet (1), wherein the face is opposite to the other fixing sheet (1). A detection hole is formed in the other face opposite to the face, connected with the corresponding fixing sheet (1), of the box (4). The distance measurement sensor (7) is arranged in the box (4). The distance measurement end of the distance measurement sensor (7) is located in the detection hole. The face where the distance measurement end of the distance measurement sensor (7) is located is flush with the face where the detection hole is located. The detection direction points to the outer portion of the box (4). By the adoption of the intelligent filtering detection hinge, an existing hinge structure is improved, an intelligent electric control structure is designed and introduced, the hinge looseness phenomenon can be found in time so that the loosened hinge can be repaired, and normal use of the hinge is guaranteed.

The invention discloses a high-voltage electric wire ranging system and method based on FPGA hardware and binocular vision. The system comprises a binocular camera and a FPGA data processing module connected to the binocular camera, wherein the FPGA data processing module comprises an image data acquiring unit, an image pre-processing unit, a three-dimensional matching unit and a three-dimensional modeling unit. The high-voltage electric wire ranging system collects an original image pair of a high-voltage electric wire in a some same scene in real time by using the binocular camera, so that the high-voltage electric wire ranging system can be applied to a high-voltage operation occasion in real time; by virtue of a visualized characteristic of image information, pre-processing, three-dimensional matching and three-dimensional modeling processing on the image are performed by using the FPGA data processing module; and the processing course is high in speed to obtain depth information of the high-voltage electric wire so as to further obtain the distance of the high-voltage electric wire. The ranging result is accurate, and the system is high in definition, small in size and simple in structure and can be used for multi-occasion real-time measurement.

The invention relates to an intelligent filtering detection hinge which comprises fixing sheets (1), a rotary shaft (2), a box (4), a distance measurement sensor (7), a control module (5), an external power source (6), a voice alarm (8) and a filtering circuit (9), wherein the external power source (6), the voice alarm (8) and the filtering circuit (9) are connected with the control module (5). The box (4) is arranged on one face of one fixing sheet (1), wherein the face is opposite to the other fixing sheet (1). A detection hole is formed in the other face opposite to the face, connected with the corresponding fixing sheet (1), of the box (4). The distance measurement sensor (7) is arranged in the box (4). The distance measurement end of the distance measurement sensor (7) is located in the detection hole. The face where the distance measurement end of the distance measurement sensor (7) is located is flush with the face where the detection hole is located. The detection direction points to the outer portion of the box (4). By the adoption of the intelligent filtering detection hinge, an existing hinge structure is improved, an intelligent electric control structure is designed and introduced, the hinge looseness phenomenon can be found in time so that the loosened hinge can be repaired, and normal use of the hinge is guaranteed.

Embodiments of the invention disclose a capsule endoscope system and a distance measuring method for a capsule endoscope. The capsule endoscope system according to an embodiment of the invention comprises the capsule endoscope, a magnetic ball and a distance measuring device, wherein the capsule endoscope comprises a housing and an imaging element located in the housing; the imaging element shootsan image of the cavity wall at a predetermined position of a cavity by using automatic exposure parameters; the magnetic ball is used for controlling the position and the posture of the capsule endoscope in the cavity by adopting magnetic force so as to reach the predetermined position; and the distance measuring device is used for acquiring the automatic exposure parameters from the capsule endoscope to obtain the distance between the predetermined position and the inner wall of the cavity. According to the capsule endoscope system and the distance measuring method for the capsule endoscopein the embodiments of the invention, the distance to be measured can be conveniently and rapidly obtained.