Time measurement system and time measurement method

Abstract

The invention relates to a time measurement system, which comprises a start signal fine time measurement unit, a timing signal fine time measurement unit, a rough time measurement unit and a time calculation unit, wherein the start signal fine time measurement unit comprises a delay chain, a plurality of registers and a data converter; one end of the delay chain receives a start signal; outputs of delay units receiving the start signal are sequentially changed into second levels; each register reads and stores an output value of the corresponding delay unit at the rising edge of a first clock when the start signal is input; the data converter converts the stored data into time data to acquire start signal fine time; the timing signal fine time measurement unit is used for acquiring timing signal fine time; the working theory of the timing signal fine time measurement unit is similar to that of the start signal fine time measurement unit; the rough time measurement unit is used for measuring rough time under the driving of a field programmable gate array (FPGA) clock signal; and the time calculation unit is used for subtracting the timing signal fine time from a sum of the rough time and the start signal fine time to acquire time to be measured. According to the system, the precision and the instantaneity of time measurement are improved.

Description

technical field [0001] The present application relates to a measurement system, in particular to a time measurement system and method. Background technique [0002] High-precision time measurement technology needs to be applied in many fields of modern science and technology, such as telecommunications, laser ranging, satellite positioning, etc., especially in various fields of physics, such as nuclear physics, high-energy physics, medicine Fields such as image physics are inseparable from high-precision time measurement technology. Time measurement generally includes two parts: time discrimination and time-to-digital conversion (Time-To-Digital Converter, TDC). [0003] At present, high-precision TDC mainly includes ASIC (Application Specific Integrated Circuit, application specific integrated circuit), dedicated TDC chip, FPGA (Field Programmable Gate Array, field programmable gate array) and other implementation methods. The reason is that the scheme of implementing TDC...

AI Technical Summary

Problems solved by technology

Therefore, not measuring the starting signal greatly reduces the usefulness of existing time measurement techniques

[0006] 2. This patent application uses the carry connection, LUT (Look-Up-Table, look-up table) and multi-bit adder inside the FPGA to construct the delay chain. The delay chain constructed is not uniform enough, and the poor performance of the delay chain will seriously Affects the accuracy of time measurement

[0007] This patent application uses binary search and pipeline technology to realize time encoding, which consumes a lot of FPGA logic resources and takes a long time to output measurement results

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