Multi-channel high-speed data acquisition system with synchronous correction function

Abstract

The invention discloses a multi-channel high-speed data acquisition system with a synchronous correction function; on the basis of the traditional multi-channel high-speed data acquisition system, a synchronous reference signal generator is added in the multi-channel high-speed data acquisition system and is used for generating fast rising synchronous reference signals; and a time-to-digital converter is added in each channel and is used for measuring time interval delta tch between the rising edge of the synchronous reference signal simultaneously reaching each channel and the subsequent rising edge of first data synchronous clock of the channel. The position Pch of a corresponding sampling point is calculated in each channel when the rising edge of the synchronous reference signal arrives, and then collected data is processed and displayed according to the positions Pch of the sampling points. In the multi-channel high-speed data acquisition system, the obtained positions Pch of the sampling points are real sampling points closest to the positions of the rising edges of the synchronous reference signals so that synchronous errors of the channels are minor as much as possible; the obtained real sampling points are displayed in an alignment mode; the accuracy of the real sampling points is less than or equal to the error of one + / - sampling clock; the synchronous errors are reduced; and the synchronous accuracies among the channels are increased.

Description

technical field [0001] The invention belongs to the technical field of digital acquisition, and more specifically relates to a multi-channel high-speed data acquisition system with synchronous correction function. Background technique [0002] Data acquisition systems are widely used in various fields such as electronic measurement, communication, radar, aerospace, industry, etc., and multi-channel data acquisition systems are increasingly becoming a development trend. Synchronization plays a vital role in the accuracy of data collection, and a multi-channel data acquisition system requires that the data acquisition of each channel has good synchronization accuracy. [0003] 1. The principle of the current multi-channel data acquisition system [0004] The structure of the current multi-channel data acquisition system is as follows: figure 1 As shown, there are n channels, namely CH 1～n , the sampling rate of each channel ADC is relatively low, generally only a few hundre...

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Problems solved by technology

[0011] like figure 2 , 3 As shown, in a multi-channel high-speed data acquisition system, the synchronization error between channels is often a few nanoseconds (ns), requiring a smaller synchronization error. Simply processing the sampling clock can no longer meet the requirements. The multi-channel input signal The problem of data synchronization has become the main reason restricting the improvement of technical indicators of multi-channel high-speed data acquisition system

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