Method for real-time correcting error of multi-channel high-speed parallel alternative acquisition system

An acquisition system and real-time correction technology, applied in the field of error correction, can solve the problems of difficulty in meeting the real-time requirements of high-speed acquisition systems, reducing the efficiency of correction, and tedious operation process, so as to reduce the amount of mathematical operations, improve efficiency, and facilitate popularization. sexual effect
CN101718562AInactive Publication Date: 2010-06-02UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2010-06-02
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a method for real-time correcting error of a multi-channel high-speed parallel alternative acquisition system, which comprises the following steps: in correction, inputting direct current correction signals of different voltages, acquiring a quantization value of each ADC and performing correction point by point to obtain errors point by point and form an error matrix; in measurement, inputting a signal to be measured and performing sampling at time alternating, acquiring quantization values and searching a table in the error matrix, deducting corresponding error value from the quantization values respectively to obtain corrected actual quantization values; and then, rearranging the corrected quantization values according a time phase relationship; converting the rearranged and corrected quantization values into acquisition data for output; and performing low-pass filter; and filtering time-base deviation error spectral line so as to finish the correction of a time error. Compared with the prior art, the method has the advantages that: the deviation and a gain error can be corrected at the same time; and a table searching operation is a corresponding relationship operation of which the process is simple and the calculation amount is small. A low-pass digital filter is very easy to be implemented in a DSP processor and the operation rate is fast so that the efficiency of the time error correction is improved greatly.
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Description

technical field

[0001] The invention relates to an error correction method, in particular to a real-time error correction method of a multi-channel high-speed parallel alternate acquisition system. Background technique

[0002] With the continuous development of electronic information technology, the strong dependence on real-time sampling rate has become the bottleneck problem of modern time domain measuring instruments. The research on analog-to-digital conversion technology (ADC) is restricted by factors such as materials and chip technology, which limits the rapid improvement of its technical indicators.

[0003] Under the existing conditions, the use of multi-channel parallel time-alternate sampling structure is still the only way to rapidly increase the real-time sampling rate of the system. The parallel alternate acquisition system uses M-chip ADCs to alternately sample the input analog signals in parallel at the same sampling rate, and the back-end reorganizes the s...

Claims

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