Time frequency synchronization calibration method of SCA-based multi-channel high-speed acquisition system

A technology of high-speed acquisition and time-frequency synchronization, applied in automatic control of power, electrical components, etc., can solve problems such as signal inconsistency, and achieve the effects of excellent time measurement accuracy, good applicability, and guaranteed consistency

Active Publication Date: 2014-04-30
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0009] The purpose of the present invention is to propose a time-frequency synchronous calibration method based on the SCA multi-channel high-speed acquisition system to solve the problem of signal inconsistency in the input amplitude, period and delay relationship of each channel in the multi-channel measurement system

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  • Time frequency synchronization calibration method of SCA-based multi-channel high-speed acquisition system

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[0056] 1. The echo and the calibration clock are asynchronous signals, and there may be cases where the edge of the calibration clock corresponds to the leading edge of the first pulse. In order to avoid the problem of position ambiguity, in this system, two calibration pulses are generated by using both edges of the calibration pulse, which are the rising edge Calibration pulse and falling edge calibration pulse, both pulses are measured at the same time.

[0057] 2. The 16-channel echo signal is input to the relay attenuation network 101 and the high-speed operational amplifier 102 to obtain a digital echo signal. In order to ensure the trigger synchronization of the 16-channel Domino acquisition, every 4 channels of the digital echo signal are a group of input SCA acquisition control FPGA105, the 4-way digital echo synthesis pulse signal generated by the FPGA105 is input to the main processor FPGA201 together with the 3-way digital echo synthesis pulse output by the other 3...

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Abstract

The invention discloses a time frequency synchronization calibration method of an SCA-based multi-channel high-speed data acquisition system. The SCA-based multi-channel high-speed acquisition system is composed of a waveform acquisition and time measurement module assembly and a comprehensive processor module, a high-speed switch capacitor array in an SCA chip is used for storing an analog signal and reading the analog signal through a slow-speed clock, then the analog signal is subjected to digital quantification through a high-accuracy low-speed AD to be stored into a buffer unit, and online real-time calibration can be achieved while multi-channel waveform acquisition and time measurement are completed. The time frequency synchronization calibration method is simple in calibration process, the calibration result is good in adaptability, the system calibration error is small, the measurement accuracy is superior to 80ps, and the method is particularly suitable for the technical field of whole waveform analysis.

Description

Technical field: [0001] The invention relates to a time-frequency synchronization calibration method, in particular to a time-frequency synchronization calibration method based on an SCA (Switch Capacitor Arrays, switched capacitor array) multi-channel high-speed acquisition system. Background technique: [0002] In the field of full waveform analysis technology, compared with the previous single-channel scanning system, the multi-channel array active detection system can quickly form a high-density 3D point cloud, firstly, its data acquisition efficiency is greatly improved, and secondly, it can meet the special needs of high-speed real-time imaging , and the imaging resolution can also be improved accordingly. Whether it is for laser active remote sensing detection or other applications including medical imaging and high-energy physical detection, this means the improvement of overall machine performance and economic benefits. Because the corresponding integrated array de...

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Application Information

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IPC IPC(8): H03L7/08
Inventor 蓝晓萍王海伟黄庚华颜洪雷舒嵘
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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