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

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 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 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 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.