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Real-time data compression method

A real-time data, compression method technology, applied in electrical digital data processing, special data processing applications, complex mathematical operations, etc. Redundancy, data compression rate improvement, and the effect of fast speed

Active Publication Date: 2008-04-30
ZHEJIANG SUPCON TECH
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Problems solved by technology

[0006] The above two compression algorithms are usually lossy, and their essence is to filter repeated data points in adjacent time regions. The larger the width of this region, the more severe the compression damage, which will lead to artificial discontinuity of data
Moreover, this method achieves compression by reducing the number of retained data points, and the compression ratio is very limited. If you encounter a data waveform with severe jitter, you must first filter the data and then compress it.
Such a compression process will cause the data to lose its linear characteristics as a whole, so it is not suitable for occasions with high precision requirements

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Embodiment Construction

[0029] As mentioned in the background art, the historical data in the process control system is divided into three categories: numerical value, time stamp and quality code. The value is the value of the data point; the time tag and quality code are the descriptions of the data point attributes, where the time tag describes the time point of value collection, and the quality code describes the quality status of the data signal work.

[0030] Value is the most critical part of historical data, which is divided into three types: switch value, analog value and cumulative value. The value of the switching value is generally expressed by 1 byte, and its value has two types of 0 or non-0, which respectively indicate that the signal state corresponding to the value is off or on.

[0031] The numerical value of the analog quantity is the most difficult part to compress. According to the data precision, it is also divided into two types: percentage value and floating point value. low-p...

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Abstract

The invention relates to a real time data compressing method, for compressing in-data packet data in a process control system, where the real time data comprises numerical values of analogue quantities and the method comprises: 1) initializing a dictionary, i.e. initializing characters that possibly occur during compressing into a dictionary; 2) reading in numerical valves; 3) making subtraction of adjacent data to obtain difference values and storing the first read-in numerical value in compressed files; 4) adopting LZW algorithm to compress the difference values. The invention realizes the lossless compression of real time data and the compressing course is safe and reliable. The invention has very good rapidness and can meet the requirements of real time databases and raises the history data inquiring efficiency.

Description

technical field [0001] The invention relates to a real-time data processing method, in particular to a real-time data compression method in a process control system. Background technique [0002] The real-time database in the process control system provides historical data storage function, which is used to save the on-site process data for reference purposes such as process analysis, fault tracing and control scheme improvement. Since the application of control systems today tends to be large-scale, the number of signals in the system has doubled, and the control system needs to run for a long time, and the amount of historical data to be saved is very large. Therefore, if these data are stored directly, it will not only take up a lot of system storage space, and it will make data transmission and transfer difficult. Based on the above requirements, it is necessary to introduce data compression technology into the process control system. [0003] refer to figure 1 , the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/00G06F17/10G06F17/21G06F17/30H03M7/30
Inventor 张伟赖晓健徐慧
Owner ZHEJIANG SUPCON TECH
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