IRIG-B direct current code decoding and time synchronization automatic switching method based on FPGA

Abstract

The invention relates to an IRIG-B direct current code decoding and time synchronization automatic switching method based on an FPGA, and the method employs an FPGA chip to construct a starting sequence of a preset mode, a time synchronization mode and a timing mode, and achieves the automatic switching among the preset mode, the time synchronization mode and the timing mode. According to the invention, accurate timing can be carried out on the basis of set time and the time of a correction clock can be automatically switched when external time is corrected, accurate timing can be continued on the basis of the time when the external time is corrected and the clock is stopped, second, minute, hour and day are decoded to obtain time signals of month, day, hour, minute, second and the like, and the time signals are output in the form of a serial port at the same time. The updating frequency is 1s, so that whether the time is correct or not can be conveniently and intuitively judged. The FPGA chip is mainly used as a main control chip, code portability is high, and implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of navigation control, in particular to an FPGA-based IRIG-B DC code decoding and time synchronization automatic switching method. Background technique [0002] Due to its relatively simple serial input format, the IRIG-B DC code carries a wealth of coding information, and the format of one frame per second conforms to the usage habits of time, which has become a common time synchronization standard in various countries. With the continuous development of integrated circuit technology, the decoding circuit using FPGA chip has the advantages of less circuit components, low cost and high accuracy, and has gradually become the mainstream trend of IRIG-B DC code decoding. [0003] How to ensure the uniformity of the time between the various devices requires time calibration of the equipment, which is very important to ensure the daily operation of the equipment and the normal operation after time calibration, bu...

AI Technical Summary

Problems solved by technology

[0003] How to ensure the uniformity of time among various devices requires time correction of the equipment, which is very important to ensure the daily operation of the equipment and the normal operation after time correction, but there is no solution to this problem yet

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