37results about How to "Improve distance measurement accuracy" patented technology

The present invention provides a laser transmitting circuit, a laser receiving circuit, a distance calculation circuit and devices thereof. The laser transmitting circuit comprises an energy storage capacitor, a laser transmitting tube, an MOS switch circuit and an MOS switch driving circuit. The laser receiving circuit comprises a laser receiving tube, a first low-noise triode, a second low-noise triode and a low-noise wideband amplifier. The distance calculation circuit comprises a singlechip, a programmable logic circuit, a clock source and an echo identification circuit. The present invention further provides a low-voltage power circuit that provides a reverse polarity protection to an external power supply without additional diode connected in reverse polarity. According to the technical solutions provided by the present invention, the measurement range and precision of a semiconductor laser rangefinder can be improved effectively.

The invention provides a cigar cigarette appearance tightness detection method, which comprises the following steps of: 1) selecting a plurality of points on the same side of a cigar as an axial detection object, and respectively pressing the plurality of points in the axial detection object by adopting a pressure head to obtain the deformation quantity of each point; 2) selecting a certain position on the cigar, rotating the cigar, acquiring a plurality of points on the circumferential surface as radial detection objects, and pressing the plurality of points in the radial detection objects by adopting a pressure head to obtain the deformation quantity of each point; 3) calculating the average deformation of the cigar along the axial direction and the average deformation of the cigar along the radial direction; and 4), adopting the ratio of the pressure value to the average deformation as an axial tightness index and a radial tightness index. According to the method, the radial tightness is detected through rotation, the axial tightness is detected through horizontal movement, and the problems that an existing detection means is single, and precision is not high are solved in a multi-point detection mode.

The invention discloses a method for measuring the footage of a roadheader, which relates to the technical field of footage measurement. In this measurement method, by setting the distance measuring device and the reflective target, the laser sensor is used to emit a laser beam to the reflective target, and the laser beam reflected by the reflective target is received, and the time from the emission to the reception of the laser beam is measured according to the timer, so as to calculate from The distance L from the laser sensor to the reflective target automatically measures the advance of the roadheader; at the same time, it monitors the amount of returned light C, and determines whether the laser beam hits the target according to the amount of returned light, and starts the target-seeking process in due course. A method for measuring the length of a roadheader disclosed by the invention, by setting a distance measuring device and a reflective target, automatically measures the length of the roadheader, and replaces manual measurement with automatic measurement, which has high measurement accuracy and reduces labor intensity; at the same time, it can be measured by laser The amount of light returned by the sensor is used to determine whether the laser beam hits the target, so as to start the steering gear pan / tilt according to the requirements, and carry out the target-finding work, further improving the accuracy and integrity of the distance measurement.

Time measurement circuit and method, photoelectric distance meter, photoelectric distance measurement method. The time measurement circuit for the incoming signal has a comparator stage for generating a comparator output signal based on the incoming signal's fulfillment of a criterion, where exceeding or falling below a threshold is defined as the criterion. There is also provided a digitization stage for sampling the input signal fed to the digitization stage and converting it into digital data comprising sampled values ​​of the input signal, the sampling being performed at a defined sampling rate; and for determining the transmitted signal by evaluating the digital data. Evaluation unit for the time-sequential position of the incoming signal. A signal generation stage is connected between the comparator stage and the digitization stage, which is designed to generate and output a shape signal of known shape designed for post-sampling interpolation capability in a chronologically fixed manner according to the content of the comparator output signal. The evaluation unit then determines the time of the incoming signal while using chronological interpolation of the values ​​contained in the digital data and the known shape of the shape signal.

The invention discloses a correction method and device for ultrasonic distance measurement and an ultrasonic receiving device. The correction method comprises the following steps: determining the positioning distance of an ultrasonic receiving device in a second period according to the moving speed and acceleration of the ultrasonic receiving device and the ultrasonic measurement distance betweenthe ultrasonic receiving device and an ultrasonic transmitting device in a first period; determining the ultrasonic measurement distance between the ultrasonic receiving device and the ultrasonic transmitting device in the second period; and correcting the ultrasonic measurement distance between the ultrasonic receiving device and the ultrasonic transmitting device in the second period according to the result of comparison between the ultrasonic measurement distance and the positioning distance of the ultrasonic receiving device in the second period, wherein the second period is a signal period next to the first period. Thus, the error of ultrasonic distance measurement is reduced, and the accuracy of measurement is improved.

The invention discloses an underwater target detecting device based on a single-photon counting method. Narrow-pulse laser which is output from a pulse laser is divided into two parts by an optical isolator assembly. One part is directly detected by a photoelectric detecting module. An electric signal which is output from the photoelectric detecting module is input into a time-related single-photon counting system and a time delay module, wherein the signal which is input into the time-related single-photon counting system is used as a timing starting signal. The signal which is input into thetime delay module is used as a distance gating control signal. The other part irradiates a target after light beam shaping. After a target echo signal is emitted to the single-photon detecting module, the target echo signal is used as a timing terminating signal for being input into the time-related single-photon counting system. Through performing data processing on the signal of the time-related single-photon counting system, thereby obtaining target information. The underwater target detecting device has advantages of high precision and high sensitivity and furthermore facilitates realization of low power consumption and miniaturization of an underwater target detecting system.

The invention discloses a high-precision positioning and navigation system, which comprises a combined positioning unit, an intelligent ranging unit, a cloud communication unit and a vehicle-mounted display unit, wherein the combined positioning unit is used for realizing real-time positioning of the vehicle; the intelligent ranging unit is used for realizing calculation on the distance between the vehicle and a surrounding target; and the cloud communication unit is used for receiving data generated by the combined positioning unit and the intelligent ranging unit and uploading the data to a cloud service center, the cloud service center carries out map labeling on navigation positioning data, and the labeling information is issued to the vehicle-mounted display unit. The system of the invention is based on multi-parameter integrated processing, positioning data of the current dead zone can be effectively corrected and supplemented, errors of ultrahigh frequency microwave ranging can be effectively reduced, ranging types and the ranging range can be expanded, the ranging precision is improved, positioning reliability is high, and the maintenance cost is low.

The present invention relates to a capacitive distance measurement method. The method comprises the steps of using a control unit to determine the time when an excitation unit applies a first excitation signal; using the excitation unit to apply the first excitation signal to a probe; using a capacitance-voltage conversion unit to obtain a first voltage signal corresponding to the capacitance formed between the probe and a measured member; using the control unit to determine the time when a logarithm amplification processing unit carries out the logarithm amplification processing; using the logarithm amplification processing unit to carry out the logarithm amplification processing on the first voltage signal to obtain a second voltage signal; using a data acquisition conversion unit to convert the second voltage signal into a third voltage signal; using the control unit to convert the third voltage signal into a distance value. The present invention also discloses a capacitive distance measurement device and a calibration method thereof.

The invention discloses a three-coordinate continuous wave one-dimensional phase-sweep unmanned aerial vehicle low-altitude target detection system, which aims to provide a detection device with high detection data rate and strong anti-interference ability. The present invention is realized through the following technical solutions: the system adopts the frequency modulation continuous wave ranging system to measure the distance of the target, the antenna feeder system converts the radio frequency signal into an electromagnetic wave signal and radiates to space; the receiving subsystem controls the transmitting and wave control subsystem The output echo signal is amplified, frequency-converted and SFC control processing; the signal processing subsystem generates the working sequence of the whole system, measures the three-coordinate vector of the target position, distance, azimuth, and elevation, and solves the frequency modulation continuous wave ranging data of the target signal The data processing and communication control subsystem analyzes the target angle based on the target signal calculated by the signal processing subsystem and the antenna angle information output by the antenna control subsystem, establishes the trajectory of the target movement, controls the working mode of the radar, and detects the three-coordinate target information .

The invention provides a device for measuring an object distance. The device comprises a pulse generator, an optical emission unit, an optical receiving unit and a measurement unit, wherein the pulse generator is used for sequentially transmitting electrical pulses to the optical emission unit at fixed frequency; the optical emission unit is used for transmitting optical pulse signals in real time every time when receiving the electrical pulses, a part of the optical pulse signals directly enter the optical receiving unit as reference signals, and the other part of the optical pulse signals enter the optical receiving unit after being reflected through an area to be detected as measurement signals; the optical receiving unit is used for transmitting the reference signals and the measurement signals to the measurement unit in real time; and the measurement unit is used for subtracting the measurement signal when a target obstacle does not exist at the last moment from the measurement signal when the target obstacle exists in the area to be detected to obtain a background interference-free measurement signal, and obtaining a distance with the target obstacle in real time according to the background interference-free measurement signal and the reference signal. Correspondingly, the invention provides a method for measuring the object distance. According to the device and the method, the influence of temperature and background interference signals on the distance measurement accuracy can be reduced or eliminated, and the distance measurement accuracy is higher.