39results about How to "Improve time measurement accuracy" patented technology

The invention provides a panoramic photoelectric radar which comprises a rotary table which employs a light backflow ring and is capable of rotating 360 degrees continuously, two cameras and a computer matched with the two cameras. A horizontal camera is installed at a horizontal direction of the rotary table, a pitching support of the rotary table is provided with a pitching camera, and the computer is connected with the rotary table and the cameras. The horizontal camera rotates with rotation of the rotary table, and a pitch angle of the horizontal camera is unchanged and is always aimed ata ground object. The pitching camera scans different air areas with change of a pitch angle of the rotary table, and a pitching scanning amplitude is 0 to 90 degrees. The horizontal camera is coaxialwith to a vertical direction of the pitching camera. According to the panoramic photoelectric radar, by utilizing a ground object, employing a double site scanning method, omnidirectional scanning with a 0-360 degrees horizontal angle and a 0-90 degrees pitching angle is realized. By utilizing a method of image processing, an air object is identified automatically, by utilizing a method of image coupling, an accurate azimuth angle and distance of a known ground object reference point are notified, accurate positioning and range finding are carried out on an air object, and an image, a motion parameter and a locus of the air object are accurately displayed.

The invention relates to a novel fluorescent lifetime microimaging device and method on the basis of optical addition heterodyne modulation. The device comprises a fluorescent exciting light path, a reference light path and a fluorescent imaging light path, wherein a cosinusoidal modulated high-frequency exciting light excites a fluorescent sample to generate the florescent light with the same frequency, and the florescent light images on a light-sensitive surface of an image intensifier; moreover, a reference light which has the modulation frequency which is similar to the exciting light frequency is also irradiated to the light-sensitive surface of the image intensifier; a fluorescent image and the reference light are superposed on the light-sensitive surface of the image intensifier to form a heterodyne image; and finally, a fluorescent lifetime image is synthesized through phase-locking amplifying and polar coordinate phase diagram analyzing. The fluorescent lifetime microimaging device and method have the advantages of high fluorescent lifetime measurement resolution, high imaging efficiency, strong antijamming capability and the like, and moreover, the technical requirements on a core part-the image intensifier are low.

The invention relates to a precise time measuring method, consisting of a waveform conversion module, an analog-to-digital conversion module, a counting module and a central processing module. The invention has the advantages that a method for eliminating decimal phase error of square wave is provided, and the method effectively improves the time measuring precision with lower cost.

A time-to-digital converter includes a first oscillation circuit that starts oscillating at the transition timing of a first signal and generates a first clock signal having a first clock frequency, a second oscillation circuit that starts oscillating at the transition timing of a second signal and generates a second clock signal having a second clock frequency, a first adjustment circuit that adjusts the oscillation frequency of the first oscillation circuit based on a reference clock signal, a second adjustment circuit that adjusts the oscillation frequency of the second oscillation circuit based on the reference clock signal, and a processing circuit that converts the time difference between the transition timing of the first signal and the transition timing of the second signal into a digital value based on the first and second clock signals.

The invention provides a high-precision and high-integrality time-digital converter based on an FPGA (Field Programmable Gate Array), and an implementation method. The time-digital converter comprises a fine time measuring unit, wherein the fine time measuring unit consists of a time alternate sampling unit, a multi-stage sampling data buffering unit and a snapshot and encoding unit. The invention aims to provide the high-integrality precision time-digital converter based on an FPGA. Innovation points lie in that: a fine time measuring part adopts a technology of a latch snapshot and rapid encoding combined architecture based on phase splitting clock alternate sampling, multi-stage sampling data caching and cached multi-stage sampling data. The high-precision and high-integrality time-digital converter has the characteristics of simple structure, design flexibility, high portability, short measuring dead time, large dynamic range, low cost, flexible interface and the like, and can be applied to the fields of aerospace, space research, communication, biomedicine, earth dynamics, relativity research and the like.

The invention relates to a novel fluorescent lifetime microimaging device and method on the basis of optical addition heterodyne modulation. The device comprises a fluorescent exciting light path, a reference light path and a fluorescent imaging light path, wherein a cosinusoidal modulated high-frequency exciting light excites a fluorescent sample to generate the florescent light with the same frequency, and the florescent light images on a light-sensitive surface of an image intensifier; moreover, a reference light which has the modulation frequency which is similar to the exciting light frequency is also irradiated to the light-sensitive surface of the image intensifier; a fluorescent image and the reference light are superposed on the light-sensitive surface of the image intensifier to form a heterodyne image; and finally, a fluorescent lifetime image is synthesized through phase-locking amplifying and polar coordinate phase diagram analyzing. The fluorescent lifetime microimaging device and method have the advantages of high fluorescent lifetime measurement resolution, high imaging efficiency, strong antijamming capability and the like, and moreover, the technical requirements on a core part-the image intensifier are low.

The invention discloses a method and a device for measuring a flight time of ultrasonic echo. The method is performed in the manner of layering time and interpolating. The time measuring range is expanded by adopting the direct counting method in a first layer. The time delay interpolation method is adopted in a second layer. A bran-new two-dimensional matrix manner is adopted on a topological structure. A timing quantization error of the flight time to be measured is further subdivided into two layers. The length of a delay line is shortened so the linear of the delay line is increased. The ps level resolution ratio limitation is broken through because a cursor delay line structure is adopted at 2-2nd Level. For realizing the method, the invention further provides a set of measuring device which comprises a signal receiving and sending part, a digital signal processing part and a man-machine interaction part. The measuring result precision of flight time can be promoted.

A sound wave positioning device comprises a time measurement and data processing module, three groups of fixedly arranged sound wave receiving sensors and sound wave receiving circuits, and a group ofsound wave emission sensor and sound wave emission circuit, or comprises three groups of sound wave emission sensors and sound wave emission circuits, and a group of sound wave receiving sensor and sound wave emission circuit; each sound wave receiving circuit comprises an amplifying circuit, and also comprises a phase shift circuit and electric signal-into-direct current level circuits, the electric signal before phase shift and the electric signal with the phase changed through the phase shift circuit respectively pass through two paths of electric signal-into-direct current level circuits,to output discontinuous direct current signal level, the two paths of signals are combined, to output measurement time, and three groups of distance measurement values are measured respectively, so that positioning is realized. The sound wave positioning device has the technical effect that the input sine or cosine or approximate electric signal can be converted into the direct current signal level by adopting the combination of the phase shift circuit and the periodically changing electric signal-into-direct current level circuits, so that the high-precision time measurement is realized.

The invention discloses a high-precision laser ranging distance simulation device; wherein a laser pulse signal emitted by a transmitting end of a laser range finder enters a laser detector and an amplification comparison circuit to be converted into an electric pulse signal; the generated pulse signal is divided into two paths to be respectively sent into an FPGA module and a TDC module, wherein the FPGA module sends control and communication information to the TDC module through an IO interface, the FPGA module sends pulse driving signals to the laser diode and the driving circuit through the IO interface to enable the laser diode to emit light, laser signals output by the laser diode are split through the beam splitter prism, one path is sent to a receiving end of the laser range finder, and the other path is sent to the laser detector; the FPGA module communicates with the communication module through an IO port, and the communication module communicates with an upper computer through an RS232 interface. According to the invention, the distance simulation precision of the device is improved, the reliability of the device is enhanced, and the use and maintenance cost of the device is reduced.

The invention provides a time digital converter adjusting method. The method comprises the steps that for each delay chain, after each time the input position of the delay chain is adjusted, N triggersignals are input into the adjusted input position, and the carry number of each trigger signal on the delay chain is acquired; the optimal input position is selected according to the carry number ofeach adjustment to configure the delay chain; after each time the tap position of a main delay chain is adjusted, M trigger signals are input into the optimal input position of the main delay chain to acquire the average of the carry number of each trigger signal on each delay chain; and the optimal tap position is selected according to the average of each adjustment to configure the main delaychain. The input position of each delay chain is changed to achieve in-chain adjustment optimization, and then the tap position of the main delay chain is changed to achieve inter-chain adjustment optimization. The delay of each delay unit in TDC is kept as consistent as possible, and the TDC time measurement accuracy is improved.

The invention discloses a crane strain monitoring method based on a time-to-digital conversion technology. According to the crane strain monitoring method, strain is collected by adopting the time-to-digital conversion technology, inclination angles and acceleration data collected through combination of a tilt angle sensor and a trajectory tracing sensor are sent to a microcontroller together, and the microcontroller transmits the data to a remote monitoring terminal through a 3G module; the remote monitoring terminal mainly realizes analysis for performance of a crane and is used for estimating remaining fatigue life with a rain-flow counting method, testing crane deformation and tracking a space trajectory. Compared with the prior art, the crane strain monitoring method adopts time variation to replace strain gauge resistance variation for strain measurement, an additional AD conversion circuit is not needed, and the system power consumption is reduced; data are transmitted in a 3G mode, data transmission is not limited by distance, meanwhile, the data are subjected to algorithm analysis, stress and deformation conditions of the crane are monitored in real time, and safe operation of the crane is guaranteed.

The invention relates to a method for measuring the ignition time of an electro-generating head. The method provides a computer detection system for testing, adopts differential measurement, utilizes the visible light generated when the pyrotechnic product of the electro-generating head is ignited, and picks up the visible light signal through a high-speed photoelectric sensor. Then, through the computer system, the visible light signal is compared with the ignition current signal added to the pyrotechnic product, and the time difference between the two signals is calculated to obtain an accurate ignition time of the pyrotechnic product. The invention has high accuracy and precision in measuring ignition time, is convenient to operate, and is safe and reliable. System installation is simple and inexpensive.

The present invention relates to the field of time measurement, in particular to a phase-splitting clock TDC and a measurement method based on an ISERDES serial chain. Through technical means, a plurality of ISERDES cores inside the FPGA are serially connected to realize multiple measurements of input signals and improve the time For the purpose of measuring accuracy, the performance test of this TDC is carried out in K7 FPGA, the result shows that its time measurement accuracy is better than 40 ps RMS, and the dead time is less than 20 ns.

The invention relates to a precise time measuring method, consisting of a waveform conversion module, an analog-to-digital conversion module, a counting module and a central processing module. The invention has the advantages that a method for eliminating decimal phase error of square wave is provided, and the method effectively improves the time measuring precision with lower cost.

This application relates to a time accuracy calibration method, device and electronic equipment. By controlling the pulse signal received by the time-to-digital converter in each sampling period to distribute evenly, when the pulse signal collected in each collection time period reaches the target number , to obtain the actual number of pulses collected in each collection time period, the theoretical number of pulses and the total number of pulses collected in the sampling cycle time, and then obtain the cumulative deviation value of the pulse number, and finally calculate the minimum ranging time accuracy according to the cumulative deviation value Calibration is performed to improve the time measurement accuracy of the time-of-flight module. Since multiple pulse signals are evenly distributed within the sampling period of the time-to-digital converter, the number of pulse signals in each acquisition time period can reflect the time length of each minimum ranging time accuracy, thus accumulating the deviation of the number of pulses The value can realize the calibration of the minimum ranging time accuracy, and the time measurement accuracy can be effectively improved without the introduction of complex test equipment.

The invention discloses a ring oscillation integration circuit used for multi-channel time measurement. Ring oscillation units are arranged in an upper line and a lower line along the lateral direction of a layout coordinate system, wherein the delay circuits of the upper line of the ring oscillation units are positioned on the bottoms of the ring oscillation units and are in sequential cascade connection along the positive direction of the horizontal axis of the layout coordinate system; the delay circuits of the lower line of the ring oscillation units are positioned on the tops of the ringoscillation units and are in sequential cascade connection along the negative direction of the horizontal axis of the layout coordinate system; the delay circuits of all ring oscillation units form anend-to-end delay chain; signal delay time between the delay circuits of two adjacent ring oscillation units is equal; an externally-input tested signal start is transmitted in the annular delay chain; and under the driving of a sampling control signal, the ring oscillation units collect the states of the output ends of the delay circuits of the ring oscillation units in parallel to realize multichannel time measurement for the same signal. By use of the ring oscillation circuit, the linearity of a measurement result can be improved, measurement errors are reduced, and the area use ratio of achip is improved.

The embodiment of the present application discloses a time correction method, device, system, and computer storage medium. The method includes: removing the first counts in the obtained first count set that meet the first preset condition, and removing the first counts in the second count set The second count corresponding to the rejected first count, wherein, the first count and the second count are respectively one and the other of the coarse count and the fine count generated by TDC; when the rejected second count does not meet For the second preset condition, the second count in the second count set meeting the second preset condition is eliminated; the first time unit is calculated according to the remaining first count in the first count set; the first time unit is calculated according to the remaining first count in the second count set The second counting calculates the second time unit; the time difference of the two trigger signals is corrected by using the obtained first time unit and the second time unit. The accuracy of the time measurement result of the TDC can be improved by utilizing the technical solutions provided by the embodiments of the present application.