34results 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 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 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 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 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 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 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.