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

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 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.

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 is suitable for the technical field of time precision measurement and provides a time-to-digit conversion device and a digital phase-locked loop. The device comprises a power supply control circuit, a first delay circuit, a second delay circuit and a time detection circuit; the power supply control circuit generates a first voltage and a second voltage and transmits the first voltageand the second voltage to the first delay circuit and the second delay circuit respectively; the first delay circuit is used for carrying out delay processing on a received first clock signal according to the first voltage; the second delay circuit is used for carrying out delay processing on a received second clock signal according to the second voltage; the time detection circuit is used for receiving the first clock signal and the second clock signal obtained after delay processing, and the time difference between the first clock signal and the second clock signal is detected. According tothe device, different voltages are input into the two delay circuits so that the two delays can be different, and higher and more stable measurement precision is obtained; meanwhile, requirements ofa circuit technology and layout are reduced.

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 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 single-hole directional geological radar for tunnel advanced geological exploration. The radar comprises a radar antenna casing, a high-performance antenna, an orthogonal directional receiving antenna and an electromagnetic wave emitting, receiving and processing circuit. A front protection cover and a rear protection cover are added at the front end and the rear end of the radar antenna casing in a fixed or movable mode. The high-performance antenna for emitting electromagnetic waves, the orthogonal directional receiving antenna and the electromagnetic wave emitting, receiving and processing circuit are arranged in the radar antenna casing. The orthogonal directional receiving antenna sends received electromagnetic waves to the electromagnetic wave receiving and processing circuit. The orthogonal directional receiving antenna is divided into 4 parts through partition plates, a receiving antenna unit is arranged in each part, and four independent receiving units with phase differences are formed. The radar has the advantages that fine exploration of geological conditions and accurate positioning of azimuth angles within certain range around drill holes can be achieved.

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 provides an arrive time measuring method and system of a multipoint position dependent surveillance system. The method comprises under a system reference clock provided by the multipoint position dependent surveillance system, carrying out A / D sampling and quantification on received target response signals, carrying out difference coupling filtering on digital signals processed through A / D sampling and quantification, carrying out zero crossing detection on signals processed through difference coupling filtering to obtain the arrive time of the target response signals through zero crossing detection within the detection threshold. On the premise that the positioning precision of the multipoint position dependent surveillance system is effectively raised and the cost of hardware is reduced, the precision of estimation of the arrive time can be raised, and the error of time measurement of the system can be reduced.

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 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.

Embodiments of the invention disclose a time correction method, device and system and a computer storage medium. The method comprises the steps of rejecting first counts according with a first presetcondition in an obtained first count set, and rejecting second counts corresponding to the rejected first counts in a second count set, wherein the first counts and the second counts are one and another in coarse counts and fine counts generated by TDC; when the rejected second counts do not accord with a second preset condition, rejecting second counts according with the second preset condition in the second count set; calculating a first time unit according to the residual first counts in the first count set; calculating a second time unit according to the residual second counts in the second count set; and utilizing the obtained first time unit and second time unit to correcting the time difference of two trigger signals. Through utilizing the method, the correctness of time measurementresults of TDC can be improved.

A method for measuring long-pulse fine structure with time-spectral coding, which is implemented by the following steps: Step 1: Synchronize the long-pulse laser to be measured with the femtosecond laser in the ICF driver, and make the long-pulse laser to be measured and the femtosecond laser emit Time synchronization of pulses; Step 2: The femtosecond laser generates femtosecond pulses, and transmits the femtosecond pulses to the supercontinuum generation device to generate supercontinuum white light with a spectral width of several hundred nanometers, and transmits the generated supercontinuum white light Emitted to the grating stretcher; step 3: the grating stretcher produces a broadband linear chirped pulse with a pulse width equivalent to the long pulse to be measured produced by the long pulse laser to be measured; step 4: the broadband linear chirped pulse and the pulse to be measured The length measurement pulse is incident into the nonlinear crystal at a certain non-collinear angle, and the sum frequency is performed in the nonlinear crystal, and the generated sum frequency pulse is sent to the spectrometer to measure the sum frequency pulse spectrum; Step 5: Calculate the length to be measured The time domain structure of the pulse.

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 time-domain modulation time-dependent single-photon counting device and a time-domain modulation time-dependent single-photon counting system. The invention mainly relates to the technical field of transient photon measurement. The single-photon counting device of the present application comprisesa drive circuit, a single-photon detector and a timing circuit, wherein thedrive circuit, the single-photon detector and the timing circuit are electrically connected in sequence, the single-photon detector is electrically connected with the timing circuit, and the time domain modulation time-dependent single-photon counting realizes the time amplification of a photon event to be measured through the time domain modulation single-photon detector and the corresponding time domain modulation drive circuit so as to improve the time measurement precision of the whole system. A photon event to be measured is amplified in time, the influence of electron transit time dispersion in the detector and timing precision errors of the timing circuit module on the timing precision of the single-photon counting device is effectively reduced, and the measurement precision of thesingle-photon counting device is improved.

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.

The invention relates to the field of time measurement, in particular to a split-phase clock TDC based on an ISERDES tandem chain and a measurement method. ISERDES cores in a plurality of FPGAs are connected in series through technical means to achieve multiple measurements of input signals and improve the time measurement precision, the TDC is subjected to performance test in a K7 FPGA, and the result shows that the time measurement precision is better than 40 ps RMS. The dead time is less than 20 ns.

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.

A sound wave distance measuring device comprises a time measurement and data processing module, a sound wave transmitting circuit, a sound wave transmitting sensor, a sound wave receiving sensor and asound wave receiving circuit. The sound wave receiving circuit comprises an amplifying circuit, also comprises a phase shift circuit and electric signal-to-direct current level circuits, the electricsignal before phase shift outputs discontinuous direct current signal level through the first electric signal-to-direct current level circuit, the phase shift circuit changes a phase electric signal,the electric signal subjected to phase position change through the phase shift circuit outputs discontinuous direct current signal level through the second electric signal-to-direct current level circuit, the two paths of discontinuous direct current levels are combined and then are output to the time measurement and data processing module, to realize distance measuring. The sound wave distance measuring device has the technical effects that by adopting the combination of the phase shift circuit and the periodically changed electric signal-to-direct current level circuits, the periodically changed electric signals before and after phase shift are respectively converted into discontinuous direct current signal levels, combined and output or respectively output, so that the input sine can be converted into the direct current signal levels.