Serial data real-time acquisition and time calibration method

Abstract

The invention belongs to the field of data acquisition and provides a serial data real-time acquisition and time calibration method. An acquisition device comprises a base plate composed of serial data acquisition circuits and a core plate composed of digital signal processing (DSP) chips, wherein a global position system (GPS) module is added in the circuits of the base plate. The system base plate finishes a serial signal acquisition task and transmits acquired signal to the core plate. The core plate finishes data acquisition, data storage and time calibration processing tasks and adopts an dominant type software design concept and sets the priority level of universal asynchronous receiver and transmitter (UART) data acquisition to be highest, and other tasks are interrupted and an UART data acquisition task is carried out when data arrives. An internal real-time clock adopted by the method provides accurate time for a system and is composed of universal time coordinated (UTC) time and a timer. Acquired data and data acquisition time information are packed together, are temporarily stored in a device cache and can be uploaded to a personal computer (PC) to be stored in real time, and the time calibration accuracy can reach to + / -0.2ms.

Description

technical field [0001] The invention belongs to the field of data acquisition, and is a method for realizing real-time acquisition and time marking of serial data by using signal processing technology, computer technology, DSP technology, GPS timing technology and the like. This method can meet the parallel real-time acquisition of four-channel serial data at the same time, and can mark the instantaneous time of acquisition for each byte of data received. The collected data and the data acquisition time information are packaged and temporarily stored in the device cache, and can be real-time Upload to PC for saving, and the time stamping accuracy can reach ±0.2ms. Background technique [0002] The task of the data acquisition system is to collect the analog signals of different occasions. There are two steps in this task: First, through the A / D converter, the collected analog signal is converted into a digital signal that can be recognized by the computer and then input int...

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Problems solved by technology

[0003] However, in some special applications, it is necessary to compare the data collected by data acquisition devices distributed in different locations, and analyze the corresponding relationship between input information and output information. The same, as well as the inconsistency of the interface type and baud rate of the data collection, make it difficult to determine the corresponding relationship between the collected input information and output information

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