A Method of Improving the Decoding Performance of b Time Code

Abstract

A method for improving the decoding performance of the B time code proposed by the present invention aims to provide a decoding method capable of obtaining stable time information when the signal quality of the external B time code is not good. The present invention is realized through the following technical solutions: the first-stage B time code decoder decodes the externally input B code, and the time information output by decoding is converted into a BCD code format in a BCD code converter. The controller provides corrected reference time information to the inner B time code encoder; the signal lock judger judges the lock state of the current outer B time code through calculation according to the outer time information and second pulse information output by the first-level B time code decoder ;Triggered by the periodic timing pulse generated by the timer, the time calibration controller periodically corrects the internal B time code encoder and the external B time code according to the lock judgment indication of the external B time code and the time information in BCD code format The time deviation; the internal B code encoder is driven by the local system clock to generate the internal B time code to obtain the final output time information.

Description

technical field [0001] The invention relates to a method for decoding B time codes when the signal quality is not good, which is widely used in testing equipment such as measurement, control, calculation, communication, meteorology, and many other fields such as commerce and industry. Background technique [0002] The IRIG-B format time code, referred to as B code, is an international common time format code. It is used for time synchronization of various systems and has the characteristics of easy transmission, standardized interface, and international use. [0003] The IRIG-B time code format is a time string code with one frame per second, each symbol width is 10ms, and a time frame period includes 100 symbols. The "punctual" reference point of a symbol is its pulse front, and the reference mark of a time frame is composed of a position identification mark and adjacent reference symbols, and its width is 8ms; every 10 symbols have a position identification mark: P1, P2, ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to aim at the deficiencies of the above-mentioned traditional B time code decoding circuit, to provide a kind of resource occupation cost is small, can improve the method of IRIG-B code time synchronization accuracy and reliability, when the B time code signal quality is poor, Accurate time information can be obtained stably even in case of occasional signal interruption

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